Low of conservation of mass
-Answered by Manisha Kumari On 20 May 2022:04:24:28 PM
Question 1. Asked on :20 May 2022:04:19:15 PM
In a chemical reaction, the sum of the masses of the reactant and product remain uncharged. this is called___________.
-Added by Manisha Kumari Science » Atom And Molecules
Answer:
Low of conservation of mass
-Answered by Manisha Kumari On 20 May 2022:04:24:28 PM
Question 2. Asked on :20 May 2022:04:16:03 PM
The chemical symbol for sodium is:
-Added by Manisha Kumari Science » Atom And Molecules
Answer:
Na
-Answered by Manisha Kumari On 20 May 2022:04:18:23 PM
Question 3. Asked on :20 May 2022:04:03:16 PM
The chemical symbol for nitrogen gas is
-Added by Manisha Kumari Science » Atom And Molecules
Answer:
The chemical symbol for nitrogen gas is N
-Answered by Shruti Srivastva On 20 May 2022:04:14:31 PM
Question 4. Asked on :19 May 2022:04:45:10 PM
If one of the quadratic polynomial p(x) = x2 + 3x + K is 2, then the value of K is
-Added by Shruti Srivastva Science » Polynomials
Answer:
-10
-Answered by Shruti Srivastva On 19 May 2022:04:46:57 PM
Question 5. Asked on :18 May 2022:04:53:57 PM
give an example of double displacement reaction:
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
reaction between silver nitrate and sodium chloride
-Answered by Shruti Srivastva On 18 May 2022:04:55:18 PM
Question 6. Asked on :18 May 2022:04:37:13 PM
complete the reaction:
Zn + NaOH
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Na2ZnO2 + H2
-Answered by Shruti Srivastva On 18 May 2022:04:42:59 PM
Question 7. Asked on :18 May 2022:04:35:41 PM
complete the reaction:
CuO + HCL
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
CuCl2 + H2O
-Answered by Shruti Srivastva On 18 May 2022:04:36:14 PM
Question 8. Asked on :18 May 2022:04:34:08 PM
Osmosis is a special kind of _______________.
-Added by Manisha Kumari Science » Matter In Our Surroundings
Answer:
Diffusion
-Answered by Shruti Srivastva On 18 May 2022:04:52:50 PM
Question 9. Asked on :18 May 2022:04:34:26 PM
complete the reaction:
NaOH + HCL
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
NaCl + H2O
-Answered by Shruti Srivastva On 18 May 2022:04:35:06 PM
Question 10. Asked on :18 May 2022:04:32:12 PM
complete the reaction
Na2CO3 + HCL --
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
H2O + CO2 + NaCl
-Answered by Shruti Srivastva On 18 May 2022:04:33:33 PM
Question 11. Asked on :18 May 2022:04:30:29 PM
evaporation of a liquid at room temperature leads to a ____________ effect.
-Added by Manisha Kumari Science » Matters In Our Surroundings
Answer:
Cooling of the liquid surface
-Answered by Shruti Srivastva On 18 May 2022:04:53:11 PM
Question 12. Asked on :18 May 2022:04:30:20 PM
Commonly used antacid is:
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
baking soda
-Answered by Shruti Srivastva On 18 May 2022:04:30:49 PM
Question 13. Asked on :18 May 2022:04:28:19 PM
Gold can be dissolved in
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
aqua regia
-Answered by Shruti Srivastva On 18 May 2022:04:29:04 PM
Question 14. Asked on :18 May 2022:04:24:19 PM
the arrangement of the particles is orderd in the _____________state. However there is no order in the _________state.
-Added by Manisha Kumari Science » Matter In Our Surroundings
Answer:
liquid and gaseous
-Answered by Shruti Srivastva On 18 May 2022:04:29:27 PM
Question 15. Asked on :18 May 2022:04:27:28 PM
Neutral substances have a pH
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
7
-Answered by Shruti Srivastva On 18 May 2022:04:28:08 PM
Question 16. Asked on :18 May 2022:04:25:04 PM
The chemical formula of plaster of paris is
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
CaSO4.2H2O
-Answered by Shruti Srivastva On 18 May 2022:04:25:49 PM
Question 17. Asked on :18 May 2022:04:22:38 PM
Dry HCL gas does not change the color of dry blue litmus paper why?
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Dry acid does not dissociate to give H + ions
-Answered by Shruti Srivastva On 18 May 2022:04:24:22 PM
Question 18. Asked on :18 May 2022:04:20:53 PM
During summmer , water kept in an earthen pot becomes cool because of the phenomenon:
-Added by Manisha Kumari Science » Matter In Our Surroundings
Answer:
because the phenomenon of evaporation
-Answered by Shruti Srivastva On 18 May 2022:04:31:43 PM
Question 19. Asked on :18 May 2022:04:19:38 PM
What happens when chlorine is passed over dry slaked lime.
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
bleaching powder is made
-Answered by Shruti Srivastva On 18 May 2022:04:20:44 PM
Question 20. Asked on :18 May 2022:04:18:04 PM
the property to flow is unique to fluids is:
-Added by Manisha Kumari Science » Matter In Our Surroundings
Answer:
gas behaves like fluid
-Answered by Shruti Srivastva On 18 May 2022:04:22:19 PM
Question 21. Asked on :18 May 2022:04:18:00 PM
Which one is stronger acid with ph=5 or with ph=2.
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
ph=2
-Answered by Shruti Srivastva On 18 May 2022:04:19:03 PM
Question 22. Asked on :18 May 2022:04:16:01 PM
A compound x in aqueous solution turns red litmus solution into blue identify x
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Ammonium hydroxide solution
-Answered by Shruti Srivastva On 18 May 2022:04:17:29 PM
Question 23. Asked on :18 May 2022:04:13:12 PM
which one of the following sets of phenomena would increse on raising the temperature?
-Added by Manisha Kumari Science » Matter In Our Surroundings
Answer:
Evaporation, diffusion and expansion of gases
-Answered by Manisha Kumari On 18 May 2022:04:16:19 PM
Question 24. Asked on :18 May 2022:04:04:01 PM
-Added by Shruti Srivastva Science » Acid Bases And Salts
Answer:
basic
-Answered by Shruti Srivastva On 18 May 2022:04:14:59 PM
Question 25. Asked on :18 May 2022:04:06:43 PM
The shiny finish of wall after white wash is because of:
-Added by Manisha Kumari Science » Chemical Reaction And Equation
Answer:
Calcium Hydroxide
-Answered by Shruti Srivastva On 18 May 2022:04:15:15 PM
Question 26. Asked on :28 February 2022:04:53:38 PM
which ion non metals form
-Added by Shruti Srivastva Science » Atoms And Molecules
Answer:
anion
-Answered by Shruti Srivastva On 28 February 2022:04:54:08 PM
Question 27. Asked on :28 February 2022:04:52:24 PM
Which ion form non-anionmetals:
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
non metals
-Answered by Shruti Srivastva On 20 May 2022:04:15:22 PM
Question 28. Asked on :28 February 2022:04:50:35 PM
Which ion form metals:
-Added by Shruti Srivastva Science » Atoms And Molecules
Answer:
cation
-Answered by Shruti Srivastva On 28 February 2022:04:51:18 PM
Question 29. Asked on :28 February 2022:04:49:42 PM
Which ion is positively charged:
-Added by Shruti Srivastva Science » Atoms And Molecules
Answer:
cation
-Answered by Shruti Srivastva On 28 February 2022:04:50:25 PM
Question 30. Asked on :28 February 2022:04:48:48 PM
Which ion is negatively charged:
-Added by Shruti Srivastva Science » Atoms And Molecules
Answer:
anion
-Answered by Shruti Srivastva On 28 February 2022:04:49:24 PM
Question 31. Asked on :28 February 2022:04:47:43 PM
what is ion?
-Added by Shruti Srivastva Science » Atoms And Molecules
Answer:
Atoms which are charged
-Answered by Shruti Srivastva On 28 February 2022:04:48:34 PM
Question 32. Asked on :01 January 2022:11:50:55 AM
Ribosomes are the main sites of ___________ synthesis:
-Added by Nisha Kumari Science » The Fundamental Unit Of Life
Answer:
Protein
-Answered by Shruti Srivastva On 20 May 2022:04:35:41 PM
Question 33. Asked on :01 January 2022:11:41:41 AM
Which of the following is called currency of cell?
-Added by Nisha Kumari Science » The Fundamental Unit Of Life
Answer:
ATP
-Answered by Nisha Kumari On 01 January 2022:11:50:21 AM
Question 34. Asked on :01 January 2022:11:35:48 AM
-Added by Nisha Kumari Science » The Fundamental Unit Of Life
Answer:
Nucleus
-Answered by Nisha Kumari On 01 January 2022:11:40:16 AM
Question 35. Asked on :01 January 2022:11:04:04 AM
-Added by Nisha Kumari Science » Electricity
Answer:
difference between electric pressure is called potential difference
-Answered by Manisha Kumari On 01 January 2022:11:07:58 AM
Question 36. Asked on :09 October 2021:05:38:46 PM
किस लेंस के द्वारा सिर्फ काल्पनिक प्रतिबिंब बनता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
concave lens
-Answered by Shruti Srivastva On 22 October 2021:04:33:02 PM
Question 37. Asked on :09 October 2021:05:38:14 PM
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
convex lens
-Answered by Shruti Srivastva On 22 October 2021:04:33:37 PM
Question 38. Asked on :09 October 2021:05:37:45 PM
निर्गत किरण एवं अभिलंब के बीच के कोण को क्या कहते हैं?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
निर्गत कोण
-Answered by Shruti Srivastva On 22 October 2021:04:33:58 PM
Question 39. Asked on :09 October 2021:05:37:14 PM
एक अवतल दर्पण की फोकस दूरी 10 सेंटीमीटर है तो उसकी वक्रता त्रिज्या कितनी होगी?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
फोकस दूरी = 10 cm
वक्रता त्रिज्या = 2 × फोकस दूरी
= 2 × 10 cm
= 20 cm
-Answered by Master Mind On 17 December 2021:07:25:26 AM
Question 40. Asked on :09 October 2021:05:36:46 PM
साइड मिरर के रूप में प्रयुक्त कौन सा दर्पण होता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
convex mirror
-Answered by Shruti Srivastva On 22 October 2021:04:34:42 PM
Question 41. Asked on :09 October 2021:05:35:43 PM
फोटोग्राफी कैमरा का अभिदृश्यक कौन से लेंस का होता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
convex lens
-Answered by Shruti Srivastva On 22 October 2021:04:34:58 PM
Question 42. Asked on :09 October 2021:05:34:05 PM
जब प्रकाश की किरण हवा से कांच में प्रवेश करती है तो किस तरफ मुड़ जाती है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
near to the normal
-Answered by Shruti Srivastva On 22 October 2021:04:35:38 PM
Question 43. Asked on :09 October 2021:05:33:34 PM
प्रकाश के परावर्तन के कितने नियम हैं?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
two
-Answered by Shruti Srivastva On 22 October 2021:04:35:56 PM
Question 44. Asked on :09 October 2021:05:26:50 PM
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
concave mirror
-Answered by Shruti Srivastva On 22 October 2021:04:36:07 PM
Question 45. Asked on :09 October 2021:05:26:16 PM
किस दर्पण से हमेशा वस्तु को छोटा प्रतिबिंब प्राप्त होता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
convex mirror
-Answered by Shruti Srivastva On 22 October 2021:04:36:26 PM
Question 46. Asked on :09 October 2021:05:25:44 PM
अवतल लेंस को और किस नाम से जाना जाता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
diverging lens
-Answered by Shruti Srivastva On 22 October 2021:04:36:54 PM
Question 47. Asked on :09 October 2021:05:25:07 PM
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
converging lens
-Answered by Shruti Srivastva On 22 October 2021:04:37:21 PM
Question 48. Asked on :09 October 2021:05:24:43 PM
अवतल लेंस की क्षमता क्या होती है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
negative
-Answered by Shruti Srivastva On 22 October 2021:04:37:47 PM
Question 49. Asked on :09 October 2021:05:24:19 PM
उत्तल लेंस की क्षमता क्या होती है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
positive
-Answered by Shruti Srivastva On 22 October 2021:04:38:02 PM
Question 50. Asked on :09 October 2021:05:23:48 PM
प्रकाश की किरणों के समय को क्या कहते हैं?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
beam
-Answered by Shruti Srivastva On 22 October 2021:04:38:18 PM
Question 51. Asked on :09 October 2021:05:15:15 PM
किसी उत्तल लेंस का फोकसान्तर 50 सेमी है तो उसकी क्षमता होगी?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
+2D
-Answered by priyanshu kumar On 09 October 2021:05:16:45 PM
Question 52. Asked on :09 October 2021:05:12:58 PM
2D क्षमता वाले लेंस का फोकसान्तर होता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
50 cm
-Answered by Shruti Srivastva On 22 October 2021:04:38:53 PM
Question 53. Asked on :09 October 2021:05:12:32 PM
प्रकाश की किरणों का पथ दर्शाने वाले चित्रों को कहा जाता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
ray diagram
-Answered by Shruti Srivastva On 22 October 2021:04:39:17 PM
Question 54. Asked on :09 October 2021:05:11:58 PM
लेंस की क्षमता का एस आई मात्रक होता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
die apter
-Answered by Shruti Srivastva On 22 October 2021:04:39:42 PM
Question 55. Asked on :09 October 2021:05:09:53 PM
समतल दर्पण द्वारा प्रतिबिंब कौन सा होता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
virtual
-Answered by Shruti Srivastva On 22 October 2021:04:40:39 PM
Question 56. Asked on :09 October 2021:05:07:40 PM
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
concave mirror
-Answered by Shruti Srivastva On 22 October 2021:04:41:10 PM
Question 57. Asked on :09 October 2021:05:06:32 PM
मोटर गाड़ी के चालक के सामने लगा कौन सा दर्पण होता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
convex mirror
-Answered by Shruti Srivastva On 22 October 2021:04:41:27 PM
Question 58. Asked on :09 October 2021:05:05:44 PM
प्रकाश का वेग न्यूनतम होता है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
in glass
-Answered by Shruti Srivastva On 22 October 2021:04:41:51 PM
Question 59. Asked on :09 October 2021:05:01:16 PM
प्रकाश के किरण किस रेखा में गमन करती है?
-Added by priyanshu kumar Science » प्रकाश परावर्तन तथा अपवर्तन
Answer:
straight line
-Answered by Shruti Srivastva On 22 October 2021:04:42:09 PM
Question 60. Asked on :16 September 2021:04:25:21 PM
the new substance formed during the reaction is called______
-Added by Manisha Kumari Science » Chemical Reaction And Equation
Answer:
product
-Answered by Manisha Kumari On 16 September 2021:04:28:36 PM
Question 61. Asked on :05 September 2021:04:27:53 PM
किस क्षेत्र मे नोबेल पुरुस्कार प्रदान नहीं किया जाता है ?
-Added by Manisha Kumari Science » सामान्य ज्ञान - MCQ
Answer:
In history writing
-Answered by Shruti Srivastva On 12 September 2021:04:31:30 PM
Question 62. Asked on :03 September 2021:12:03:53 PM
Q5 In the following groups of materials, which groups(s) contains.only non - biodegradable items?
A. Wood, paper, leather,
B. Polythene, detergent,PVC
C. plastic, bakelite, DDT
-Added by Master Purushottam Science » Science
Answer:
Group B
-Answered by Shruti Srivastva On 12 September 2021:04:32:11 PM
Question 63. Asked on :03 September 2021:11:55:24 AM
Q4 The role played by gall bladder in human body is?
A. To store bile.
B. To secrete bile.
C. To emulsify fats.
D. To digest fats.
-Added by Master Purushottam Science » Science
Answer:
To secrete bile
-Answered by Shruti Srivastva On 12 September 2021:04:33:12 PM
Question 64. Asked on :03 September 2021:11:32:00 AM
Q3 What will happen if deer is missing in the food chain given below?
Grass-----Deer------Tiger
A. The population of tiger increases.
B. The population of grass decreases.
C. Tiger will star eating grass.
D. The population of tiger decreases and the population of grass increases
-Added by Master Purushottam Science » Science
Answer:
Your answer is: D
-Answered by DHANUSH S On 08 November 2021:08:46:13 PM
Question 65. Asked on :03 September 2021:11:23:47 AM
Q2 A spherical mirror and a thin spherical lens have each a focal length of -15 cm. The mirror and the lens are likely to be?
A. Both concave
B. Both convex
C. The mirror is concave and the lens is convex
D. The mirror is convex, But the lens is concave
-Added by Master Purushottam Science » Science
Answer:
Correct Answer is -
A. Both concave
-Answered by Master Mind On 17 December 2021:07:37:51 AM
Question 66. Asked on :03 September 2021:11:12:05 AM
Q1 Aluminum is used for making cooking utensils. which of the following properties are responsible for the same ?
1) Good thermal conductivity
2) Good electrical conductivity
3) Ductility
4) High melting point
A. (1)and (2)
B. (1)and (3)
C. (2)and (4)
D. (1)and (4)
-Added by Master Purushottam Science » Science
Answer:
D
-Answered by Shruti Srivastva On 12 September 2021:04:41:19 PM
Question 67. Asked on :02 September 2021:04:32:41 PM
what is ph range of our mouth?
-Added by Manisha Kumari Science » Acid Base And Salt
Answer:
5.5
-Answered by Shruti Srivastva On 12 September 2021:04:41:31 PM
Question 68. Asked on :02 September 2021:04:29:49 PM
which acid helps to digest food:
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
-Answered by Shruti Srivastva On 12 September 2021:04:41:50 PM
Question 69. Asked on :02 September 2021:04:22:25 PM
which acid is strong acid:
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Sulphuric acid.
-Answered by Shruti Srivastva On 12 September 2021:04:42:17 PM
Question 70. Asked on :02 September 2021:04:20:29 PM
Which base is strong base:
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Sodium Hydroxide.
-Answered by Shruti Srivastva On 12 September 2021:04:42:36 PM
Question 71. Asked on :02 September 2021:04:18:29 PM
Bases give _____ ions.
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
hydroxide ions
-Answered by Shruti Srivastva On 12 September 2021:04:42:54 PM
Question 72. Asked on :02 September 2021:04:16:54 PM
Acid give ____ions.
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Hydrogen
-Answered by Shruti Srivastva On 12 September 2021:04:43:20 PM
Question 73. Asked on :02 September 2021:04:13:51 PM
which acid found in ant sting?
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Methanic acid
-Answered by Shruti Srivastva On 12 September 2021:04:43:32 PM
Question 74. Asked on :02 September 2021:04:12:55 PM
which acid found in orange:
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Citric acid.
-Answered by Shruti Srivastva On 12 September 2021:04:43:48 PM
Question 75. Asked on :02 September 2021:04:11:38 PM
which acid found in tamarind?
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Tartaric acid.
-Answered by Shruti Srivastva On 12 September 2021:04:44:09 PM
Question 76. Asked on :02 September 2021:04:10:28 PM
which acid found in tomato?
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Oxalic acid.
-Answered by Shruti Srivastva On 12 September 2021:04:44:24 PM
Question 77. Asked on :02 September 2021:04:06:50 PM
which acid found in vinegar?
-Added by Manisha Kumari Science » Acid Base And Salt
Answer:
Acetic acid.
-Answered by Shruti Srivastva On 12 September 2021:04:44:38 PM
Question 78. Asked on :02 September 2021:04:04:06 PM
litmus paper extracted from___________.
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Lichen.
-Answered by Shruti Srivastva On 12 September 2021:04:44:59 PM
Question 79. Asked on :02 September 2021:04:02:22 PM
What is name of milk protien:
-Added by Manisha Kumari Science » Acid Base And Salt
Answer:
Casien.
-Answered by Shruti Srivastva On 12 September 2021:04:45:11 PM
Question 80. Asked on :02 September 2021:03:57:46 PM
which acid is king of acid?
-Added by Manisha Kumari Science » Acid Base Salt
Answer:
Sulphuric acid.
-Answered by Shruti Srivastva On 12 September 2021:04:45:27 PM
Question 81. Asked on :02 September 2021:03:56:27 PM
The atomic radius of hydrogen atom is:
-Added by Manisha Kumari Science » Periodic Classification Of Elements
Answer:
37 pm.
-Answered by Shruti Srivastva On 12 September 2021:04:46:04 PM
Question 82. Asked on :02 September 2021:03:55:32 PM
How many electrons fluorine and chlorine have in their outermost shell:
-Added by Manisha Kumari Science » Periodic Classification Of Elements
Answer:
seven
-Answered by Shruti Srivastva On 12 September 2021:04:46:24 PM
Question 83. Asked on :02 September 2021:03:54:28 PM
How many horizontal rows in morden periodic table:
-Added by Manisha Kumari Science » Periodic Classification Of Elements
Answer:
seven
-Answered by Shruti Srivastva On 12 September 2021:04:46:40 PM
Question 84. Asked on :02 September 2021:03:53:30 PM
How many vertical columns are in modern periodic table:
-Added by Manisha Kumari Science » Periodic Classification Of Elements
Answer:
Eighteen
-Answered by Shruti Srivastva On 12 September 2021:04:46:56 PM
Question 85. Asked on :02 September 2021:03:52:04 PM
In morden periodic table properties of element are a periodic function of their __________.
-Added by Manisha Kumari Science » Periodic Classification Of Elements
Answer:
Atomic number
-Answered by Shruti Srivastva On 12 September 2021:04:47:08 PM
Question 86. Asked on :01 September 2021:04:54:57 PM
What is the IUPAC name of alcohol:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
ethanol
-Answered by Shruti Srivastva On 01 September 2021:04:55:20 PM
Question 87. Asked on :01 September 2021:04:54:08 PM
-(Cl) is used for:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
chloro
-Answered by Shruti Srivastva On 01 September 2021:04:54:44 PM
Question 88. Asked on :01 September 2021:04:53:33 PM
Which of these is not a oxidising agent:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
none of these
-Answered by Shruti Srivastva On 01 September 2021:04:55:13 PM
Question 89. Asked on :01 September 2021:04:53:37 PM
Which of the following is not a Homolgous series:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
none of these
-Answered by Shruti Srivastva On 01 September 2021:04:53:58 PM
Question 90. Asked on :01 September 2021:04:53:03 PM
Naming of organic compound systematuically called as ________.
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Nomenclatre
-Answered by Shruti Srivastva On 01 September 2021:04:53:24 PM
Question 91. Asked on :01 September 2021:04:52:31 PM
What is the Homolgous series with halogen (-Br) of C6H14:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
C6H13-Br
-Answered by Shruti Srivastva On 01 September 2021:04:52:56 PM
Question 92. Asked on :01 September 2021:04:51:37 PM
(-OH) joins to hydrocarbon like alkaine from various type of alcohols, such as:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Methanol, Ethanol and Propanol
-Answered by Shruti Srivastva On 01 September 2021:04:52:05 PM
Question 93. Asked on :01 September 2021:04:51:12 PM
The most carbon compounds releases a large amount of ______________ on burning:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
heat and light
-Answered by Shruti Srivastva On 01 September 2021:04:52:00 PM
Question 94. Asked on :01 September 2021:04:50:36 PM
Which of the following is not a part of a functional group in carbonic compounds:
Oxygen, Chlorine, Sulpher, None of these
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
None of these
-Answered by Shruti Srivastva On 01 September 2021:04:51:29 PM
Question 95. Asked on :01 September 2021:04:49:42 PM
Whom molecular name C4H8 is:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Butene
-Answered by Shruti Srivastva On 01 September 2021:04:50:29 PM
Question 96. Asked on :01 September 2021:04:49:03 PM
Combustion of methane: CH4 + 202 --- CO2 + H2O + ______________:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
heat and light
-Answered by Shruti Srivastva On 01 September 2021:04:50:11 PM
Question 97. Asked on :01 September 2021:04:49:10 PM
Whom molecular name C6H6 is:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Benzene
-Answered by Shruti Srivastva On 01 September 2021:04:49:32 PM
Question 98. Asked on :01 September 2021:04:48:16 PM
Whom molecular name C6H12 is:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Cyclohexane
-Answered by Shruti Srivastva On 01 September 2021:04:49:03 PM
Question 99. Asked on :01 September 2021:04:47:11 PM
Combustion is the burning of compounds in the air to give ________ gas:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CO2
-Answered by Shruti Srivastva On 01 September 2021:04:48:37 PM
Question 100. Asked on :01 September 2021:04:47:38 PM
-OH is an example of :
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Alcohol
-Answered by Shruti Srivastva On 01 September 2021:04:48:09 PM
Question 101. Asked on :01 September 2021:04:46:47 PM
What is the Homolgous series with (-OH) of methane:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CH3-OH
-Answered by Shruti Srivastva On 01 September 2021:04:47:12 PM
Question 102. Asked on :01 September 2021:04:46:13 PM
______ are non metal elements like flurine, chlorine, briomine and iodine.
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Halogen
-Answered by Shruti Srivastva On 01 September 2021:04:46:38 PM
Question 103. Asked on :01 September 2021:04:44:14 PM
Unsaturated Compounds occurs ______ reaction in it:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Addition
-Answered by Shruti Srivastva On 01 September 2021:04:44:37 PM
Question 104. Asked on :01 September 2021:04:43:20 PM
Pure gold is not used to make gold jwellery because-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
gold is too soft.
-Answered by Shruti Srivastva On 01 September 2021:04:44:16 PM
Question 105. Asked on :01 September 2021:04:43:23 PM
What is the condensed formula for Butene:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CH3CH2CH=CH2
-Answered by Shruti Srivastva On 01 September 2021:04:43:49 PM
Question 106. Asked on :01 September 2021:04:42:35 PM
What is the condensed formula for Propene:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CH3CH=CH2
-Answered by Shruti Srivastva On 01 September 2021:04:42:59 PM
Question 107. Asked on :01 September 2021:04:40:59 PM
What percentage of carbon is mixed with iron by which it becomes hard and strong-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
0.05
-Answered by Shruti Srivastva On 01 September 2021:04:42:33 PM
Question 108. Asked on :01 September 2021:04:41:55 PM
What is the condensed formula for ethene:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CH2=CH2
-Answered by Shruti Srivastva On 01 September 2021:04:42:19 PM
Question 109. Asked on :01 September 2021:04:41:14 PM
What is the molecular formula for Octane:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
C8H18
-Answered by Shruti Srivastva On 01 September 2021:04:41:34 PM
Question 110. Asked on :01 September 2021:04:40:29 PM
What is the molecular formula for Nonane:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
C9H2O
-Answered by Shruti Srivastva On 01 September 2021:04:40:55 PM
Question 111. Asked on :01 September 2021:04:38:52 PM
Gold jewellery is made by-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
22 carat gold with 2 carat silver and 22 carat gold with 2 carat copper
-Answered by Shruti Srivastva On 01 September 2021:04:40:18 PM
Question 112. Asked on :01 September 2021:04:39:21 PM
What is the general formula of Alkynes:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CnH2n-2
-Answered by Shruti Srivastva On 01 September 2021:04:39:40 PM
Question 113. Asked on :01 September 2021:04:38:33 PM
What is the general formula of Alkenes:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CnH2n
-Answered by Shruti Srivastva On 01 September 2021:04:39:00 PM
Question 114. Asked on :01 September 2021:04:37:50 PM
What is the general formula of Alkanes:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CnH2n+2
-Answered by Shruti Srivastva On 01 September 2021:04:38:13 PM
Question 115. Asked on :01 September 2021:04:37:01 PM
Which metals is mixed with iron to give stainless steel-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
nickel and chromium
-Answered by Shruti Srivastva On 01 September 2021:04:38:02 PM
Question 116. Asked on :01 September 2021:04:37:08 PM
Which compounds having double or triple bonds between their carbon atoms:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Unsaturated compounds
-Answered by Shruti Srivastva On 01 September 2021:04:37:42 PM
Question 117. Asked on :01 September 2021:04:36:36 PM
Which of the following is not a example of saturated carbon compounds:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
None of these
-Answered by Shruti Srivastva On 01 September 2021:04:36:53 PM
Question 118. Asked on :01 September 2021:04:36:05 PM
Which compound of carbon, are linked by only single bond between the carbon atoms :
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Saturated compounds
-Answered by Shruti Srivastva On 01 September 2021:04:36:25 PM
Question 119. Asked on :01 September 2021:04:35:36 PM
The electrical conductivity and melting point of alloy is:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Less than of pure metal
-Answered by Shruti Srivastva On 01 September 2021:04:36:14 PM
Question 120. Asked on :01 September 2021:04:35:36 PM
Which formula represents the sharing of electrons amongs atoms of a molecules:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Electronic formula
-Answered by Shruti Srivastva On 01 September 2021:04:35:59 PM
Question 121. Asked on :01 September 2021:04:34:59 PM
Which formula represents exact arrangements of atoms of molecule:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Structural formula
-Answered by Shruti Srivastva On 01 September 2021:04:35:25 PM
Question 122. Asked on :01 September 2021:04:34:30 PM
Which formula represents group of atoms linked together to each carbon atom:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Condensed formula
-Answered by Shruti Srivastva On 01 September 2021:04:34:52 PM
Question 123. Asked on :01 September 2021:04:33:48 PM
Which formula represents number of each atoms in a molecule:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Condensed formula
-Answered by Shruti Srivastva On 01 September 2021:04:34:10 PM
Question 124. Asked on :01 September 2021:04:33:17 PM
Which formula represents actual number of atoms of molecule:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Molecular formula
-Answered by Shruti Srivastva On 01 September 2021:04:33:34 PM
Question 125. Asked on :01 September 2021:04:32:29 PM
Which alloy is used for welding together electric wires-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
solder
-Answered by Shruti Srivastva On 01 September 2021:04:33:15 PM
Question 126. Asked on :01 September 2021:04:32:28 PM
What is the molecular formula of methane:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
CH4
-Answered by Shruti Srivastva On 01 September 2021:04:32:58 PM
Question 127. Asked on :01 September 2021:04:31:51 PM
What is the compound of hydrocarbon:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Carbon
-Answered by Shruti Srivastva On 01 September 2021:04:32:18 PM
Question 128. Asked on :01 September 2021:04:30:39 PM
Which of the following is not a name of hydrocarbons:
Methane, Propane, Ethlane, Butane
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Ethlane
-Answered by Shruti Srivastva On 01 September 2021:04:31:42 PM
Question 129. Asked on :01 September 2021:04:29:40 PM
Which covalent bond is denoted by "-":
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Single covalent bond
-Answered by Shruti Srivastva On 01 September 2021:04:29:59 PM
Question 130. Asked on :01 September 2021:04:29:07 PM
Which cavalent bond is denoted by "=":
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Double covalent bond
-Answered by Shruti Srivastva On 01 September 2021:04:29:24 PM
Question 131. Asked on :01 September 2021:04:27:53 PM
Which metal can be stretched easily when hot:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Iron
-Answered by Shruti Srivastva On 01 September 2021:04:29:07 PM
Question 132. Asked on :01 September 2021:04:28:38 PM
In Single covalent bond how many pair of electron shared:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
1
-Answered by Shruti Srivastva On 01 September 2021:04:28:59 PM
Question 133. Asked on :01 September 2021:04:28:00 PM
What is the electronic contrifugation of carbon:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
2,4
-Answered by Shruti Srivastva On 01 September 2021:04:28:31 PM
Question 134. Asked on :01 September 2021:04:26:47 PM
Due to which feature of carbon a large number of organic compounds are formed :
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
(i) Forming covalent bonds
(ii) Catenation
(iii) Tetravalency
-Answered by Shruti Srivastva On 01 September 2021:04:27:16 PM
Question 135. Asked on :01 September 2021:04:26:16 PM
Alloy is made to mix metals and non metals because it-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
prevents corrosion of metal
-Answered by Shruti Srivastva On 01 September 2021:04:27:16 PM
Question 136. Asked on :01 September 2021:04:26:00 PM
Which of the following is not a feature of carbon bond:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
none of these
-Answered by Shruti Srivastva On 01 September 2021:04:26:26 PM
Question 137. Asked on :01 September 2021:04:25:18 PM
What is the compound of Hydrocarbons:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Carbon and Hydrogen
-Answered by Shruti Srivastva On 01 September 2021:04:25:44 PM
Question 138. Asked on :01 September 2021:04:24:17 PM
solder alloy is made with metals-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Lead, Tin
-Answered by Shruti Srivastva On 01 September 2021:04:25:38 PM
Question 139. Asked on :01 September 2021:04:24:43 PM
which compound of carbon has the lowest boiling point:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Methane
-Answered by Shruti Srivastva On 01 September 2021:04:25:12 PM
Question 140. Asked on :01 September 2021:04:24:00 PM
which compound of carbon has the highest boiling point:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Acetic acid
-Answered by Shruti Srivastva On 01 September 2021:04:24:34 PM
Question 141. Asked on :01 September 2021:04:22:53 PM
bronze is alloy made with the metals. (i) Copper (ii) Zinc (iii) Tin
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
(i) and (iii)
-Answered by Shruti Srivastva On 01 September 2021:04:23:49 PM
Question 142. Asked on :01 September 2021:04:22:55 PM
Which of the following is a property of Carbon:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Catenation and Tetravaleny
-Answered by Shruti Srivastva On 01 September 2021:04:23:42 PM
Question 143. Asked on :01 September 2021:04:21:19 PM
Alloy of which metal is called brass:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
copper and zinc
-Answered by Shruti Srivastva On 01 September 2021:04:22:19 PM
Question 144. Asked on :01 September 2021:04:19:10 PM
Alloy of which metal is known as an amalgam.
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
mercury
-Answered by Shruti Srivastva On 01 September 2021:04:20:43 PM
Question 145. Asked on :01 September 2021:04:17:40 PM
Which metal layer is used in galvanisation method:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
zinc
-Answered by Shruti Srivastva On 01 September 2021:04:18:32 PM
Question 146. Asked on :01 September 2021:04:11:01 PM
Which mixture is alloy:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Homogeneous
-Answered by Shruti Srivastva On 01 September 2021:04:12:14 PM
Question 147. Asked on :01 September 2021:04:09:19 PM
When some metal come in contact of oxygen and water vapour. Metal surface gets rusted and corode this process are called __________.
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
corrosion
-Answered by Shruti Srivastva On 01 September 2021:04:10:18 PM
Question 148. Asked on :01 September 2021:03:59:53 PM
Which method is used for prevention in corrosion of iron?
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Alloying
-Answered by Shruti Srivastva On 01 September 2021:04:06:40 PM
Question 149. Asked on :31 August 2021:05:19:38 PM
Which of the following is not a property of compound formed by covalent bond:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
These have high melting and boiling points of these compounds
-Answered by Shruti Srivastva On 31 August 2021:05:20:08 PM
Question 150. Asked on :31 August 2021:05:18:33 PM
Which of the following is a type of covalent bond:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Single Covalent Bond, Double Covalent Bond and Triple Covalent Bond
-Answered by Shruti Srivastva On 31 August 2021:05:18:55 PM
Question 151. Asked on :31 August 2021:05:17:44 PM
Which type of bond Na+ + Cl - ---- NaCl is:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
Ionic Bond
-Answered by Shruti Srivastva On 31 August 2021:05:18:18 PM
Question 152. Asked on :31 August 2021:05:15:56 PM
Which of the following is allotopes of carbon:
(a) Graphite
(b) Diamond
(c) Buck minster fullerence
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
All of these
-Answered by Shruti Srivastva On 31 August 2021:05:17:18 PM
Question 153. Asked on :31 August 2021:05:14:55 PM
What are the isotope of carbon:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
12C, 13C and 14C
-Answered by Shruti Srivastva On 31 August 2021:05:15:33 PM
Question 154. Asked on :31 August 2021:05:14:03 PM
Which type of element carbon is:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
metal
-Answered by Shruti Srivastva On 31 August 2021:05:14:45 PM
Question 155. Asked on :31 August 2021:05:13:25 PM
What is the atomic no. of carbon:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
6
-Answered by Shruti Srivastva On 31 August 2021:05:13:52 PM
Question 156. Asked on :31 August 2021:05:12:07 PM
What is the percentage of carbon present in the earth crust in atmosphere :
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
0.03%
-Answered by Shruti Srivastva On 31 August 2021:05:13:10 PM
Question 157. Asked on :31 August 2021:05:11:13 PM
What is the percentage of carbon present in the earth crust in form of minerals:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
0.02%
-Answered by Shruti Srivastva On 31 August 2021:05:11:58 PM
Question 158. Asked on :31 August 2021:05:10:00 PM
What is the symbol of carbon:
-Added by Shruti Srivastva Science » Carbon And Its Compound
Answer:
C
-Answered by Shruti Srivastva On 31 August 2021:05:10:40 PM
Question 159. Asked on :31 August 2021:04:52:24 PM
Complete the following equation: Fe2O3(S) + 2Al(s) → ____________(l) + Al2O3(s) + heat.
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
2Fe
-Answered by Shruti Srivastva On 31 August 2021:04:52:55 PM
Question 160. Asked on :31 August 2021:04:51:47 PM
Anode is made up of _________ metal rod and cathode is made up of _______ metal rod.
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
impure, pure
-Answered by Shruti Srivastva On 31 August 2021:04:52:16 PM
Question 161. Asked on :31 August 2021:04:51:09 PM
Metal extraction is easier to extract from its-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Metal oxide
-Answered by Shruti Srivastva On 31 August 2021:04:51:33 PM
Question 162. Asked on :31 August 2021:04:50:19 PM
The insoluble substance settle down at the bottom of the anode is called __________.
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
anode mud
-Answered by Shruti Srivastva On 31 August 2021:04:50:42 PM
Question 163. Asked on :31 August 2021:04:49:46 PM
Which reaction use in joining railway tracks:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Thermit
-Answered by Shruti Srivastva On 31 August 2021:04:50:05 PM
Question 164. Asked on :31 August 2021:04:47:46 PM
which method is used for prevention of corrosion:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
-Answered by Shruti Srivastva On 01 September 2021:04:15:38 PM
Question 165. Asked on :31 August 2021:04:48:55 PM
In which process carbonates ores are changed into oxides by strong heating in limited air:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
calcination
-Answered by Shruti Srivastva On 31 August 2021:04:49:31 PM
Question 166. Asked on :31 August 2021:04:48:18 PM
In which process sulphide ores are coverted into oxides by strongly heating in the presence of air:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
roasting
-Answered by Shruti Srivastva On 31 August 2021:04:48:40 PM
Question 167. Asked on :31 August 2021:04:47:30 PM
Which metal is used in reduction of carbon;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Zn, Fe and Cu
-Answered by Shruti Srivastva On 31 August 2021:04:47:55 PM
Question 168. Asked on :31 August 2021:04:46:15 PM
Which metals are obtained by the electrolysis of their molten chloride.
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Sodium, Calcium and Magnesium
-Answered by Shruti Srivastva On 31 August 2021:04:47:01 PM
Question 169. Asked on :31 August 2021:04:45:41 PM
Which metals group is medium reactivity:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Zn, Fe, Cu
-Answered by Shruti Srivastva On 31 August 2021:04:46:03 PM
Question 170. Asked on :31 August 2021:04:44:55 PM
Which metal is high in reactivity:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Zn
-Answered by Shruti Srivastva On 31 August 2021:04:45:28 PM
Question 171. Asked on :31 August 2021:04:43:39 PM
Which metal is low in rectivity:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Cu
-Answered by Shruti Srivastva On 31 August 2021:04:44:46 PM
Question 172. Asked on :31 August 2021:04:42:57 PM
Which elmenet is high reactive element:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
oxygen
-Answered by Shruti Srivastva On 31 August 2021:04:43:19 PM
Question 173. Asked on :31 August 2021:04:42:00 PM
The metal low in activity series can be extracted only by heating from their:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
sulphide
-Answered by Shruti Srivastva On 31 August 2021:04:42:27 PM
Question 174. Asked on :31 August 2021:04:39:37 PM
In the activity series metal arrange in______________form.
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
decreasing order of reactivity
-Answered by Shruti Srivastva On 31 August 2021:04:39:54 PM
Question 175. Asked on :31 August 2021:04:38:37 PM
Which method use for protecting steel items from corrosion:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Galvanisation
-Answered by Shruti Srivastva On 31 August 2021:04:40:03 PM
Question 176. Asked on :31 August 2021:04:39:00 PM
Which of the following do not react with oxygen easily:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Gold, Platinum
-Answered by Shruti Srivastva On 31 August 2021:04:39:25 PM
Question 177. Asked on :31 August 2021:04:37:41 PM
The minerals from which metals are extracted profitable are called________________.
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
ores
-Answered by Shruti Srivastva On 31 August 2021:04:38:42 PM
Question 178. Asked on :31 August 2021:04:36:40 PM
cinnabar is an ore of:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Mercury (Hg)
-Answered by Shruti Srivastva On 31 August 2021:04:37:07 PM
Question 179. Asked on :31 August 2021:04:35:16 PM
Bauxite is an ore of:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Aluminium
-Answered by Shruti Srivastva On 31 August 2021:04:36:20 PM
Question 180. Asked on :31 August 2021:04:33:59 PM
Copper react with moist carbbon dioxide in the air swlowly loses its shiny brown surface and gain with green coating, this green coated substance is
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Copper carbonate
-Answered by Shruti Srivastva On 31 August 2021:04:37:20 PM
Question 181. Asked on :31 August 2021:04:31:08 PM
the process of forming a thick layer of aluminium oxide on any metal surface is called-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
anodising
-Answered by Shruti Srivastva On 31 August 2021:04:31:33 PM
Question 182. Asked on :31 August 2021:04:30:14 PM
The substance which added oxygen to reactant is known as -
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
Oxidising agent
-Answered by Shruti Srivastva On 31 August 2021:04:33:02 PM
Question 183. Asked on :31 August 2021:04:30:32 PM
The metal which we can cut with a knife is;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Sodium
-Answered by Shruti Srivastva On 31 August 2021:04:30:55 PM
Question 184. Asked on :31 August 2021:04:29:55 PM
The property of metals by which they produce a sound is called _____________ .
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Sonorous
-Answered by Shruti Srivastva On 31 August 2021:04:30:17 PM
Question 185. Asked on :31 August 2021:04:28:46 PM
The reaction in which both oxidation and reduction reactions take place is called ____________ .
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
redox reaction
-Answered by Shruti Srivastva On 31 August 2021:04:29:41 PM
Question 186. Asked on :31 August 2021:04:29:18 PM
which of the following metals are most malleable:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Gold and Silver
-Answered by Shruti Srivastva On 31 August 2021:04:29:35 PM
Question 187. Asked on :31 August 2021:04:28:31 PM
Which of the following metals react with cold water-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Na, Ca, K
-Answered by Shruti Srivastva On 31 August 2021:04:28:55 PM
Question 188. Asked on :31 August 2021:04:27:53 PM
Metal oxides which show the both acidic and basic in nature when react with both acids as well as bases is called-
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Amphoteric oxides
-Answered by Shruti Srivastva On 31 August 2021:04:28:12 PM
Question 189. Asked on :31 August 2021:04:27:34 PM
Pb + CuCl2 → PbCl2 + Cu The above reaction is an example of-
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
displacement reaction
-Answered by Shruti Srivastva On 31 August 2021:04:28:24 PM
Question 190. Asked on :31 August 2021:04:27:16 PM
Which of the following metals thin layer of their oxides prevent them from further corrosion. (i) Fe (iron) (ii) Al (Aluminium) (iii) Zn (Zinc) (iv) Cu (copper)
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
(ii) and (iii)
-Answered by Shruti Srivastva On 31 August 2021:04:27:40 PM
Question 191. Asked on :31 August 2021:04:26:34 PM
Sodium and potassium are react so vigorously that they catch fire so they are kept -
-Added by Shruti Srivastva Science » Metal And Non Metal
Answer:
immersed in kerosene
-Answered by Shruti Srivastva On 31 August 2021:04:27:00 PM
Question 192. Asked on :31 August 2021:04:26:06 PM
The products formed when iron fillings are heated with diluted hydrochloric acid-
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
Fe (III) chloride and hydrogen gas
-Answered by Shruti Srivastva On 31 August 2021:04:26:51 PM
Question 193. Asked on :31 August 2021:04:25:51 PM
The metal react with cold water:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
sodium
-Answered by Shruti Srivastva On 31 August 2021:04:26:16 PM
Question 194. Asked on :31 August 2021:04:24:49 PM
Electrolysis of water is a :
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
electric decomposition
-Answered by Shruti Srivastva On 31 August 2021:04:25:57 PM
Question 195. Asked on :31 August 2021:04:25:20 PM
The shining properties of metal are;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Lustre
-Answered by Shruti Srivastva On 31 August 2021:04:25:42 PM
Question 196. Asked on :31 August 2021:04:24:40 PM
copper+ oxygen=?
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
copper oxide
-Answered by Shruti Srivastva On 31 August 2021:04:25:00 PM
Question 197. Asked on :31 August 2021:04:24:05 PM
Chemical property of Metalic oxide is -
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
acidic In nature
-Answered by Shruti Srivastva On 31 August 2021:04:24:28 PM
Question 198. Asked on :31 August 2021:04:23:32 PM
When an iron nail is placed in a solution of copper sulphate, the blue colour of solution turn into redish brown due to -
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
displacement of copper from solution
-Answered by Shruti Srivastva On 31 August 2021:04:24:26 PM
Question 199. Asked on :31 August 2021:04:23:30 PM
In what state mercury found at room temperature;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Liquid
-Answered by Shruti Srivastva On 31 August 2021:04:23:56 PM
Question 200. Asked on :31 August 2021:04:22:47 PM
Which non- metal found in liquid;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Bromine
-Answered by Shruti Srivastva On 31 August 2021:04:23:15 PM
Question 201. Asked on :31 August 2021:04:22:14 PM
Which of the following are exothermic processes- (i) Reaction of water with quick lime (ii) Dilution of an acid (iii) Evaporation of water (iv) sublimation of champhor (crystals)
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
(i) Reaction of water with quick lime and (ii) Dilution of an acid
-Answered by Shruti Srivastva On 31 August 2021:04:22:40 PM
Question 202. Asked on :31 August 2021:04:21:54 PM
Metals has;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Melibility, Ductility and Sonorous
-Answered by Shruti Srivastva On 31 August 2021:04:22:26 PM
Question 203. Asked on :31 August 2021:04:21:23 PM
The ability of metal drown into thin wire;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Ductility
-Answered by Shruti Srivastva On 31 August 2021:04:21:45 PM
Question 204. Asked on :31 August 2021:04:20:53 PM
Melibility is properties of;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Metals
-Answered by Shruti Srivastva On 31 August 2021:04:21:13 PM
Question 205. Asked on :31 August 2021:04:19:59 PM
When an iron nail is placed in copper sulphate solution the observation are as follow-
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
The solution turns light green, A brown deposit is formed on the nail
-Answered by Shruti Srivastva On 31 August 2021:04:20:46 PM
Question 206. Asked on :31 August 2021:04:20:21 PM
sonorous is properties of;
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Metals
-Answered by Shruti Srivastva On 31 August 2021:04:20:42 PM
Question 207. Asked on :31 August 2021:04:19:26 PM
which metal is alkali metals:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
Lithium, Sodium and potassium
-Answered by Shruti Srivastva On 31 August 2021:04:19:55 PM
Question 208. Asked on :31 August 2021:04:18:36 PM
Which of the following is amphoteric oxide:
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
zinc oxide
-Answered by Shruti Srivastva On 31 August 2021:04:19:11 PM
Question 209. Asked on :31 August 2021:04:17:24 PM
A student took solid quick lime in a china dish and added a small amount of water to it. He would hear-
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
hissing sound
-Answered by Shruti Srivastva On 31 August 2021:04:18:59 PM
Question 210. Asked on :31 August 2021:04:15:47 PM
The colour of ferrous sulphate crystal is -
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
Light green
-Answered by Shruti Srivastva On 31 August 2021:04:16:56 PM
Question 211. Asked on :31 August 2021:04:16:06 PM
Complete the following equation for plaster of paris:
CaSO4.½H2O + 1½H2O → _________.2H2O
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
CaSO4
-Answered by Shruti Srivastva On 31 August 2021:04:16:28 PM
Question 212. Asked on :31 August 2021:04:15:33 PM
Complete the following equation when electricity passes through solution of sodium hydroxide:
2NaCl(aq) + 2H2O(l) → _______ +Cl2(g) + H2(g)
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
NaOH(aq)
-Answered by Shruti Srivastva On 31 August 2021:04:15:54 PM
Question 213. Asked on :31 August 2021:04:13:58 PM
When aqueous solution of sodium sulphate and barium chloride are mixed together, it becomes-
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
forms a white precipitate
-Answered by Shruti Srivastva On 31 August 2021:04:15:36 PM
Question 214. Asked on :31 August 2021:04:14:51 PM
Complete the given equation for Sodium hydrogencarbonate:
_______ + H+ → CO2 + H2O + sodium salt of acid
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
NaHCO3
-Answered by Shruti Srivastva On 31 August 2021:04:15:20 PM
Question 215. Asked on :31 August 2021:04:13:46 PM
Which of the following substance has the highest pH level:
(a) Milk of magnesia
(b) Sodium hydroxide
(c) Washing powder
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
(c) Washing powder
-Answered by Shruti Srivastva On 31 August 2021:04:14:43 PM
Question 216. Asked on :31 August 2021:04:12:37 PM
Which of the following substance has the lowest pH level:
(a) Vinegar
(b)
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
vinegar
-Answered by Shruti Srivastva On 31 August 2021:04:13:24 PM
Question 217. Asked on :31 August 2021:04:10:11 PM
The process of respiration is -
(A) an oxidation reaction which is endo thermic
(b) a reduction reaction which is exothermic
(C) a combination reaction which is endo thermic
(d) an oxidation reaction which is exothermic
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
(d) an oxidation reaction which is exothermic
-Answered by Shruti Srivastva On 31 August 2021:04:13:16 PM
Question 218. Asked on :31 August 2021:04:11:56 PM
What is the pH of milk of magnesia:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
10
-Answered by Shruti Srivastva On 31 August 2021:04:12:15 PM
Question 219. Asked on :31 August 2021:04:10:47 PM
What is the pH of sodium hydroxide:
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
14
-Answered by Shruti Srivastva On 31 August 2021:04:11:13 PM
Question 220. Asked on :31 August 2021:04:10:19 PM
What is the pH of basic salt:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
More than 7
-Answered by Shruti Srivastva On 31 August 2021:04:10:41 PM
Question 221. Asked on :31 August 2021:04:09:42 PM
What is the pH of acidic salt:
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Less than 7
-Answered by Shruti Srivastva On 31 August 2021:04:10:07 PM
Question 222. Asked on :31 August 2021:04:09:07 PM
What is the pH of neutral salt:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
7
-Answered by Shruti Srivastva On 31 August 2021:04:09:30 PM
Question 223. Asked on :31 August 2021:04:05:29 PM
Which of the following reaction is used for black and white photography-
(a) CaCO3 (s) → CaO (s) + CO2 (g)
(b) 2FeSO4 (s) → Fe2O3 (s) + SO2 (g) + SO3 (g)
(c)2AgCl(s) → 2Ag(s) + Cl2(g)
(d) 2H2O → 2H2 (g) + O2 (g)
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
(c) 2AgCl(s) → 2Ag(s) + Cl2(g)
-Answered by Shruti Srivastva On 31 August 2021:04:09:46 PM
Question 224. Asked on :31 August 2021:04:08:27 PM
What is the reason for low pH of the mouth:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Eating sweet thing
-Answered by Shruti Srivastva On 31 August 2021:04:08:51 PM
Question 225. Asked on :31 August 2021:04:07:50 PM
What is the normal pH of our mouth:
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
5.5
-Answered by Shruti Srivastva On 31 August 2021:04:08:08 PM
Question 226. Asked on :31 August 2021:04:07:01 PM
When does tooth decay occur:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
When pH level is go down 5.5
-Answered by Shruti Srivastva On 31 August 2021:04:07:29 PM
Question 227. Asked on :31 August 2021:04:06:26 PM
When does hyperacidity occur in our stomach:
-Added by Shruti Srivastva Science » Acid Bases And Salts
Answer:
When pH level is go down to the normal range of stomach
-Answered by Shruti Srivastva On 31 August 2021:04:06:52 PM
Question 228. Asked on :31 August 2021:04:05:29 PM
When does hypoacidity occur in our stomach:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
When ph level go up to normal stomach range
-Answered by Shruti Srivastva On 31 August 2021:04:06:08 PM
Question 229. Asked on :31 August 2021:04:04:54 PM
At what level of the pH the rainwater become acid rain:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
5.6
-Answered by Shruti Srivastva On 31 August 2021:04:05:18 PM
Question 230. Asked on :31 August 2021:04:02:58 PM
In which level of pH living beings can survive:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
7.0-7.8
-Answered by Shruti Srivastva On 31 August 2021:04:04:34 PM
Question 231. Asked on :28 August 2021:05:00:21 PM
What are the main products of chlor-alkali:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Chlorine, Hydrogen and Sodium hydroxide
-Answered by Shruti Srivastva On 28 August 2021:05:00:46 PM
Question 232. Asked on :28 August 2021:04:59:34 PM
Writa a use of chlorine gas:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
In swimming pool.
-Answered by Shruti Srivastva On 28 August 2021:05:00:14 PM
Question 233. Asked on :28 August 2021:04:58:55 PM
Complete the following equation: HC2H302 + _______ → NaC2H3O2 + H2O
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
NaOH
-Answered by Shruti Srivastva On 28 August 2021:04:59:22 PM
Question 234. Asked on :28 August 2021:04:58:20 PM
What is applied on skin when ant bites:
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Calamine solution
-Answered by Shruti Srivastva On 28 August 2021:04:58:46 PM
Question 235. Asked on :28 August 2021:04:57:22 PM
Writa a name of common salt
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
NaCl
-Answered by Shruti Srivastva On 28 August 2021:04:58:02 PM
Question 236. Asked on :28 August 2021:04:56:38 PM
What may cause while adding water to acid:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Cause mixture to splash out
Break the glass container
-Answered by Shruti Srivastva On 28 August 2021:04:57:00 PM
Question 237. Asked on :28 August 2021:04:56:04 PM
By which type of indicator does strength of acid or base can be estimated:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Universal indicator
-Answered by Shruti Srivastva On 28 August 2021:04:56:30 PM
Question 238. Asked on :28 August 2021:04:55:33 PM
What is alkali:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Bases soluble in water
-Answered by Shruti Srivastva On 28 August 2021:04:55:55 PM
Question 239. Asked on :28 August 2021:04:55:03 PM
Which type of ion all bases have:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
hydroxyl ion
-Answered by Shruti Srivastva On 28 August 2021:04:55:23 PM
Question 240. Asked on :28 August 2021:04:54:25 PM
Which type of ion all acids have:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
hydronium ion
-Answered by Shruti Srivastva On 28 August 2021:04:54:45 PM
Question 241. Asked on :28 August 2021:04:53:29 PM
Which is not a basic oxide:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
CO2
-Answered by Shruti Srivastva On 28 August 2021:04:54:13 PM
Question 242. Asked on :28 August 2021:04:52:55 PM
Which type of salt the following equation give: Weak Acid + Weak Base
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Neutal salt
-Answered by Shruti Srivastva On 28 August 2021:04:53:19 PM
Question 243. Asked on :28 August 2021:04:52:04 PM
Which type of salt the following equation give: Strong Acid + Strong Base
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Neutal salt
-Answered by Shruti Srivastva On 28 August 2021:04:52:26 PM
Question 244. Asked on :28 August 2021:04:51:30 PM
Write an equation for basic salt:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Weak Acid + Strong Base
-Answered by Shruti Srivastva On 28 August 2021:04:51:56 PM
Question 245. Asked on :28 August 2021:04:50:52 PM
Write an equation for acidic salt:
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Strong Acid + Weak Base
-Answered by Shruti Srivastva On 28 August 2021:04:51:20 PM
Question 246. Asked on :28 August 2021:04:50:17 PM
Complete the following equation: HCL + NaOH → ______ + H20
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
NaCl
-Answered by Shruti Srivastva On 28 August 2021:04:50:39 PM
Question 247. Asked on :28 August 2021:04:49:37 PM
What is the nature of non - metalic oxides-
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Acidic
-Answered by Shruti Srivastva On 28 August 2021:04:50:06 PM
Question 248. Asked on :28 August 2021:04:48:58 PM
Which products are used in neutralisation reaction-
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Acid and Base
-Answered by Shruti Srivastva On 28 August 2021:04:49:22 PM
Question 249. Asked on :28 August 2021:04:47:57 PM
Which products are produced in a neutralisation reaction-
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Salt and Water
-Answered by Shruti Srivastva On 28 August 2021:04:48:35 PM
Question 250. Asked on :28 August 2021:04:46:53 PM
Reaction of sodiun hydroxide with hydrochloric:- NaOH(aq) + HCl(aq) ---> _____- + H2O(l) Complete the equation-
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Nacl(aq)
-Answered by Shruti Srivastva On 28 August 2021:04:47:38 PM
Question 251. Asked on :28 August 2021:04:45:16 PM
Which of the following is not a form of calcium carbonate-
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Metal carbonate
-Answered by Shruti Srivastva On 28 August 2021:04:45:38 PM
Question 252. Asked on :28 August 2021:04:44:35 PM
Fill in the class with correct option: Reaction of metal oxide and acid → Metalic _______ + Water
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Salt
-Answered by Shruti Srivastva On 28 August 2021:04:45:08 PM
Question 253. Asked on :28 August 2021:04:43:48 PM
What is the product used in fire extinguisher-
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Metal carbonate and Acid
-Answered by Shruti Srivastva On 28 August 2021:04:44:14 PM
Question 254. Asked on :28 August 2021:04:43:04 PM
Which type of oxides releases when fossil fules burn
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Sulphur oxide and Nitrogen oxide
-Answered by Shruti Srivastva On 28 August 2021:04:43:33 PM
Question 255. Asked on :28 August 2021:04:42:24 PM
What is the ph of a neutral solution
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
7
-Answered by Shruti Srivastva On 28 August 2021:04:42:50 PM
Question 256. Asked on :28 August 2021:04:41:49 PM
What is pop sound indicates when metal reacts with acid
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Hydrogen gas is produced.
-Answered by Shruti Srivastva On 28 August 2021:04:42:09 PM
Question 257. Asked on :28 August 2021:04:40:59 PM
When metal zinc reacts with sulphuric acid which gas is produced
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Hydrogen
-Answered by Shruti Srivastva On 28 August 2021:04:41:30 PM
Question 258. Asked on :28 August 2021:04:40:17 PM
Which base is not soluble in water
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Copper oxide
-Answered by Shruti Srivastva On 28 August 2021:04:40:52 PM
Question 259. Asked on :28 August 2021:04:39:21 PM
Which is not a strong acid
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Lactic Acid
-Answered by Shruti Srivastva On 28 August 2021:04:39:58 PM
Question 260. Asked on :28 August 2021:04:38:14 PM
Which conduct electricity current
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Both (a) and (b)
-Answered by Shruti Srivastva On 28 August 2021:04:38:55 PM
Question 261. Asked on :28 August 2021:04:37:44 PM
Which type of indicator is litmus paper -
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Natural
-Answered by Shruti Srivastva On 28 August 2021:04:38:06 PM
Question 262. Asked on :28 August 2021:04:36:30 PM
Which can be used as olfactory
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Vanilla
-Answered by Shruti Srivastva On 28 August 2021:04:37:22 PM
Question 263. Asked on :28 August 2021:04:35:34 PM
Which is a example of synthetic indiactors
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Phenolpthalein
-Answered by Shruti Srivastva On 28 August 2021:04:36:22 PM
Question 264. Asked on :28 August 2021:04:34:17 PM
Which type of gas produce when acid reacts with metal-
-Added by Shruti Srivastva Science » Acid Base And Salt
Answer:
Hydrogen
-Answered by Shruti Srivastva On 28 August 2021:04:35:16 PM
Question 265. Asked on :28 August 2021:04:33:15 PM
What is the taste of Bases
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
bitter
-Answered by Shruti Srivastva On 28 August 2021:04:34:04 PM
Question 266. Asked on :28 August 2021:04:32:11 PM
Which is not a natural acid
-Added by Shruti Srivastva Science » Acids, Bases And Salts
Answer:
Nitric acid
-Answered by Shruti Srivastva On 28 August 2021:04:32:54 PM
Question 267. Asked on :28 August 2021:04:30:29 PM
Which change blue litmus into red
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
acid
-Answered by Shruti Srivastva On 28 August 2021:04:31:50 PM
Question 268. Asked on :28 August 2021:04:29:46 PM
Which type of ion all acids give with water-
-Added by Shruti Srivastva Science » Acid Base Salt
Answer:
Hydroxide
-Answered by Shruti Srivastva On 28 August 2021:04:30:18 PM
Question 269. Asked on :28 August 2021:04:26:20 PM
Which of the following are sour in taste?
-Added by Shruti Srivastva Science » Acids, Bases And Salts
Answer:
Acids
-Answered by Shruti Srivastva On 28 August 2021:04:28:38 PM
Question 270. Asked on :23 August 2021:04:28:21 PM
The addition of hydrogen to reactant and removal of oxygen from a reactant is called-
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
reduction
-Answered by Shruti Srivastva On 23 August 2021:04:28:47 PM
Question 271. Asked on :23 August 2021:04:27:46 PM
Electroplating is a method by which we can prevent -
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
corrosion
-Answered by Shruti Srivastva On 23 August 2021:04:28:13 PM
Question 272. Asked on :23 August 2021:04:27:06 PM
Oxides of which of the metals prevent its further corrosion of metal-
-Added by Shruti Srivastva Science » Chemical Reaction
Answer:
Aluminium
-Answered by Shruti Srivastva On 23 August 2021:04:27:33 PM
Question 273. Asked on :23 August 2021:04:26:14 PM
Rancidity of food items can be prevented by-
-Added by Shruti Srivastva Science » Chemical Reaction
Answer:
adding antioxidants, keeping food in air tight containers and replacing air of container by nitrogen
-Answered by Shruti Srivastva On 23 August 2021:04:26:41 PM
Question 274. Asked on :23 August 2021:04:25:25 PM
Oily food items get rancid and give bad smell and bad taste due to-
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
oxidation
-Answered by Shruti Srivastva On 23 August 2021:04:25:55 PM
Question 275. Asked on :23 August 2021:04:24:49 PM
A copper vessel loses its shine when exposed to air because
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
forming a thin layer of copper oxides
-Answered by Shruti Srivastva On 23 August 2021:04:25:11 PM
Question 276. Asked on :23 August 2021:04:24:13 PM
The colour of silver oxide is
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
black
-Answered by Shruti Srivastva On 23 August 2021:04:24:39 PM
Question 277. Asked on :23 August 2021:04:23:38 PM
Green coating of copper oxide on copper is an example of ____________
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
corrosion
-Answered by Shruti Srivastva On 23 August 2021:04:24:01 PM
Question 278. Asked on :23 August 2021:04:23:07 PM
When two or more than two reactants join together to form a single newly substance is called ______________ .
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
Combination reaction
-Answered by Shruti Srivastva On 23 August 2021:04:25:42 PM
Question 279. Asked on :23 August 2021:04:22:58 PM
Name the oxidised and reduced substances in given chemical reaction- CuO + H2 → Cu + H2O
-Added by Shruti Srivastva Science » Chemical Reaction
Answer:
H2 is oxidised and CuO is reduced
-Answered by Shruti Srivastva On 23 August 2021:04:23:27 PM
Question 280. Asked on :23 August 2021:04:22:24 PM
The proccess of coating a thin layer of aluminium or its alloys on a metal surface is known as -
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
Anodising
-Answered by Shruti Srivastva On 23 August 2021:04:22:48 PM
Question 281. Asked on :23 August 2021:04:21:36 PM
Corrosion of a metal surface can be prevented by-
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
painting, anodising and galvonisation
-Answered by Shruti Srivastva On 23 August 2021:04:21:58 PM
Question 282. Asked on :23 August 2021:04:21:00 PM
Two effects of oxidation in daily life are-
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
corrosion and rancidity
-Answered by Shruti Srivastva On 23 August 2021:04:21:28 PM
Question 283. Asked on :23 August 2021:04:20:08 PM
Which gas is filled in a cheaps packet to prevent oxidation-
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
Nitrogen
-Answered by Shruti Srivastva On 23 August 2021:04:20:32 PM
Question 284. Asked on :23 August 2021:04:19:10 PM
A skeletal equation can be balanced by using -
-Added by Shruti Srivastva Science » Chemical Reaction
Answer:
Hit and trial method and inspecting method
-Answered by Shruti Srivastva On 23 August 2021:04:19:45 PM
Question 285. Asked on :23 August 2021:04:18:33 PM
A chemical equation is balanced to satisfy-
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
The law of conservation of mass
-Answered by Shruti Srivastva On 23 August 2021:04:18:56 PM
Question 286. Asked on :23 August 2021:04:17:56 PM
In order to prevent the spoilage of potato chips, they are packed in plastic bags containing the gas
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
N2
-Answered by Shruti Srivastva On 23 August 2021:04:22:47 PM
Question 287. Asked on :23 August 2021:04:18:00 PM
In a balanced chemical equation, the number of each atom on both sides of arrow is ________________ .
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
equal
-Answered by Shruti Srivastva On 23 August 2021:04:18:19 PM
Question 288. Asked on :23 August 2021:04:16:55 PM
What physical state will be shown for water vapour
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
(g)
-Answered by Shruti Srivastva On 23 August 2021:04:17:27 PM
Question 289. Asked on :23 August 2021:04:15:47 PM
magnesium ribbon be cleaned before burning in air because of
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
It may come completely in the contact of air.
-Answered by Shruti Srivastva On 23 August 2021:04:16:40 PM
Question 290. Asked on :23 August 2021:04:15:42 PM
Which the following statements about the given reaction are correct: 3Fe(s) + 4H2O (g) → Fe2O3 (s) + 4H2 (g) (i) Iron metal is getting oxidized (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidizine agent
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
(i) Iron metal is getting oxidized
-Answered by Shruti Srivastva On 01 September 2021:04:12:55 PM
Question 291. Asked on :23 August 2021:04:14:18 PM
Which of the following equation is balanced
(a) Fe + H2O → Fe3O4 + H2
(b) 3Fe + 4H2O → Fe3O4 + 4H2
(c) Fe + 4H2O → Fe3O4 + 4H2
(d) Fe + 4H2O → Fe3O4 + H2
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
3Fe + 4H2O → Fe3O4 + 4H2
-Answered by Shruti Srivastva On 23 August 2021:04:15:31 PM
Question 292. Asked on :23 August 2021:04:13:30 PM
Mg + O2 → MgO; This equation is a
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
unbalanced equation and skeletal equation
-Answered by Shruti Srivastva On 23 August 2021:04:14:01 PM
Question 293. Asked on :23 August 2021:04:12:50 PM
An unbalanced chemical equation is called ____________ .
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
endothermic reaction
-Answered by Shruti Srivastva On 23 August 2021:04:13:17 PM
Question 294. Asked on :23 August 2021:04:12:09 PM
Magnesium oxide is formed due to reaction between
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
magnesium and oxygen present in the air.
-Answered by Shruti Srivastva On 23 August 2021:04:12:36 PM
Question 295. Asked on :23 August 2021:04:11:29 PM
In a chemical equation reactants and products are written-
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
with (+) sign between them
-Answered by Shruti Srivastva On 23 August 2021:04:11:57 PM
Question 296. Asked on :23 August 2021:04:10:55 PM
A Chemical equation represents -
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
a chemical reaction
-Answered by Shruti Srivastva On 23 August 2021:04:11:17 PM
Question 297. Asked on :23 August 2021:04:10:01 PM
Electrolysis of water is decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
2:1
-Answered by Shruti Srivastva On 23 August 2021:04:14:22 PM
Question 298. Asked on :23 August 2021:04:10:09 PM
Reactants in given chemical equation are CaO (s) + H2O (l) → Ca(OH) (aq)
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
CaO and H2O
-Answered by Shruti Srivastva On 23 August 2021:04:10:35 PM
Question 299. Asked on :23 August 2021:04:09:22 PM
The newly substance, which form during the reaction is called _______________ .
-Added by Shruti Srivastva Science » Chemical Reaction
Answer:
Products
-Answered by Shruti Srivastva On 23 August 2021:04:09:52 PM
Question 300. Asked on :23 August 2021:04:08:39 PM
Magnesium ribbon burns with
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
a dazzling white flame and changes into a white powder.
-Answered by Shruti Srivastva On 23 August 2021:04:09:08 PM
Question 301. Asked on :23 August 2021:04:06:46 PM
Which of the following is not a chemical reaction -
(a) Grapes get fermentated
(b) Breakdown of food
(c) Painting on a iron rod
(d) Formation of curd
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
Painting on a iron rod
-Answered by Shruti Srivastva On 23 August 2021:04:08:15 PM
Question 302. Asked on :23 August 2021:04:05:33 PM
A chemical reaction can be identify by-
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
Change in state
Change in Colour
Evolution of a gas
-Answered by Shruti Srivastva On 23 August 2021:04:06:07 PM
Question 303. Asked on :23 August 2021:04:01:42 PM
One of the following processes does not involve a chemical reaction, that is:
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
Melting of candle wax when heated
-Answered by Shruti Srivastva On 23 August 2021:04:05:20 PM
Question 304. Asked on :23 August 2021:04:03:50 PM
The shiny finish of wall after white wash is because of.
-Added by Shruti Srivastva Science » Chemical Reaction And Equation
Answer:
Calcium Carbonate
-Answered by Shruti Srivastva On 23 August 2021:04:08:18 PM
Question 305. Asked on :23 August 2021:04:00:29 PM
Chemical formula of magnesium oxide
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
MgO
-Answered by Shruti Srivastva On 23 August 2021:04:01:25 PM
Question 306. Asked on :23 August 2021:03:59:02 PM
When two and more than two substances join together to form a newly substance is called?
-Added by Shruti Srivastva Science » Chemical Reactions
Answer:
Chemical Reaction
-Answered by Shruti Srivastva On 23 August 2021:04:00:11 PM
Question 307. Asked on :28 June 2021:05:59:10 PM
-Added by Rohit Rajput Science » Animals Cell
Answer:
-Answered by Rohit Rajput On 28 June 2021:06:01:43 PM
Question 308. Asked on :28 June 2021:05:51:08 PM
-Added by Rohit Rajput Science » Animals Cell
Answer:
-Answered by Rohit Rajput On 28 June 2021:05:52:10 PM
Question 309. Asked on :28 June 2021:05:46:10 PM
-Added by Rohit Rajput Science » Animal Cell
Answer:
-Answered by Rohit Rajput On 28 June 2021:05:50:20 PM
Question 310. Asked on :28 June 2021:05:38:51 PM
-Added by Rohit Rajput Science » Animal Cells
Answer:
-Answered by Rohit Rajput On 28 June 2021:05:40:51 PM
Question 311. Asked on :28 June 2021:05:33:47 PM
-Added by Rohit Rajput Science » Animal Cell
Answer:
-Answered by Rohit Rajput On 28 June 2021:05:35:42 PM
Question 312. Asked on :28 June 2021:05:29:12 PM
-Added by Rohit Rajput Science » Aniamls Cell
Answer:
-Answered by Rohit Rajput On 28 June 2021:05:31:05 PM
Question 313. Asked on :28 June 2021:05:26:44 PM
-Added by Rohit Rajput Science » Animal Science
Answer:
(ii) परिधीय तंत्रिका तंत्र |
-Answered by Rohit Rajput On 28 June 2021:05:27:49 PM
Question 314. Asked on :28 June 2021:05:24:47 PM
-Added by Rohit Rajput Science » Animal Cells
Answer:
-Answered by Rohit Rajput On 28 June 2021:05:26:12 PM
Question 315. Asked on :28 June 2021:05:20:48 PM
-Added by Rohit Rajput Science » Animals Cells
Answer:
-Answered by Rohit Rajput On 28 June 2021:05:23:54 PM
Question 316. Asked on :28 June 2021:05:14:55 PM
-Added by Rohit Rajput Science » Aniaml Cells
Answer:
-Answered by Rohit Rajput On 28 June 2021:05:19:28 PM
Question 317. Asked on :24 June 2021:05:51:51 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
-Answered by Rohit Rajput On 24 June 2021:05:52:37 PM
Question 318. Asked on :24 June 2021:05:48:21 PM
दो न्यूरोन के बीच संधि का नाम लिखिए |
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
-Answered by Rohit Rajput On 24 June 2021:05:49:22 PM
Question 319. Asked on :24 June 2021:05:44:06 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
(i) कोशिकाय (ii) द्रुमिका (iii) तंत्रिकाक्ष |
-Answered by Rohit Rajput On 24 June 2021:05:46:24 PM
Question 320. Asked on :24 June 2021:05:37:13 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
-Answered by Rohit Rajput On 24 June 2021:05:39:21 PM
Question 321. Asked on :24 June 2021:05:30:33 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
तंत्रिका तंत्र के अतिरिक्त शरीर मे नियंत्रण और समन्वय हार्मोन या अतःस्त्रावी तंत्र द्वारा होता है |
-Answered by Rohit Rajput On 24 June 2021:05:33:49 PM
Question 322. Asked on :24 June 2021:05:27:36 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
अमीबा गर्म जल मे सिकुड कर ताप के प्रति अनुक्रिया प्रदर्शित करता है |
-Answered by Rohit Rajput On 24 June 2021:05:29:02 PM
Question 323. Asked on :24 June 2021:05:21:41 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
-Answered by Rohit Rajput On 24 June 2021:05:26:18 PM
Question 324. Asked on :23 June 2021:06:19:59 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
धातुओ के संक्षारण के करण संक्षारित सतह के निचे धातु का शेष हिस्सा संक्षारित होने से बछ जाता है |
-Answered by Rohit Rajput On 23 June 2021:06:23:14 PM
Question 325. Asked on :21 June 2021:06:13:11 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Question 326. Asked on :21 June 2021:06:04:44 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
पौधों के पुराने भाग जड़ और तने बहुत कम दिशा बदलते है जबकि नए भाग अधिक दिशा बदलते है |
-Answered by Rohit Rajput On 21 June 2021:06:09:30 PM
Question 327. Asked on :21 June 2021:05:59:14 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
शरीर के प्रतेक भाग से आने वाली तंत्रिकाएँ आकार मेरुरज्जु में मिलती है जहाँ प्रतिवर्ती चाप बनता है| किसी संवेदना के प्रति अनुक्रिया की सुचना बाद में मस्तिष्क को देदी जाती ही जहाँ उसक पुनः विश्लेषण होता है|
-Answered by Rohit Rajput On 21 June 2021:06:01:04 PM
Question 328. Asked on :21 June 2021:05:51:48 PM
हम एक अगरबत्ती की गंध का पाता कैसे लगते है ?
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
अगरबत्ती की गंध का पाता अग्रमास्तिश्क द्वारा लगाया जाता है | यह गंध की संवेदना के लिए अलग संवेदी केंद्र होता है जहा सुचना प्राप्त होती है |इस प्रकार हमे अगरबत्ती की गंध का पाता चलता है |
-Answered by Rohit Rajput On 21 June 2021:05:53:29 PM
Question 329. Asked on :21 June 2021:05:40:51 PM
मस्तिष्क का कोंन सा भाग शरीर की स्थिति तथा संतुलन का अनुरक्षण करता है ?
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
अनुमस्तिष्क |
-Answered by Rohit Rajput On 21 June 2021:05:49:03 PM
Question 330. Asked on :21 June 2021:05:28:35 PM
दो तंत्रिका कोशिकाओ (न्यूरोन ) के अन्तर्ग्रथन (सिनेप्स ) मे क्या होता है ?
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
अन्तर्ग्रथन पर विद्युत तरंगो के रूप मे आने वाला तंत्रिका आवेक कुछ रसायन का स्त्रावण को प्रेरित करता है |ये रासायन अन्तर्ग्रथन को पार करके अगली तंत्रिका कोशिका मे सामान प्रकार का तंत्रिका आवेक उत्पन्न करते है |
-Answered by Rohit Rajput On 21 June 2021:05:33:43 PM
Question 331. Asked on :21 June 2021:05:13:52 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
प्रतिवर्ती क्रिया अवचेनत मस्तिष्क की अवस्था मे मेरुरज्जु द्वारा सम्पादित होती है ,जबकि टहलना प्रमस्तिष्क के नियंत्रण मे सोच समझ कर की गई क्रिया है |
-Answered by Rohit Rajput On 21 June 2021:05:18:37 PM
Question 332. Asked on :19 June 2021:06:13:24 PM
एक ग्राम सोने से कितनी लम्बी तार किची जा सकती है |
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
-Answered by Rohit Rajput On 19 June 2021:06:15:32 PM
Question 333. Asked on :19 June 2021:06:10:20 PM
कुछ कठोर धातुओ के नाम बताइए |
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
लोहा , कॉपर , एलुमिनियम , आदि |
-Answered by Rohit Rajput On 19 June 2021:06:11:23 PM
Question 334. Asked on :19 June 2021:06:05:23 PM
ऐसी धातु के नाम बताइए जिन्हें चाकू से काटा जा सकता है |
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
सोडियम , पोटेशियम , मैग्नेशियम
-Answered by Rohit Rajput On 19 June 2021:06:08:04 PM
Question 335. Asked on :19 June 2021:05:57:35 PM
चाँदी कुछ समय के बाद काली पढ़ जाती है |क्यों ?
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
सिल्वर सल्फाइड (काले रंग की ) की परत के निर्माण के करण चाँदी की वस्तुएँ कुछ समय बाद काली पढ़ जाती है|
-Answered by Rohit Rajput On 19 June 2021:06:00:10 PM
Question 336. Asked on :19 June 2021:05:56:04 PM
तत्वों के दो वर्गों के नाम बताइए|
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
धातु एवं अधातु |
-Answered by Rohit Rajput On 19 June 2021:05:57:06 PM
Question 337. Asked on :19 June 2021:05:50:38 PM
-Added by Rohit Rajput Science » Metal And Non Metals
Answer:
114
-Answered by Rohit Rajput On 19 June 2021:05:55:49 PM
Question 338. Asked on :10 April 2021:05:15:52 PM
सामान्य तत्व किसे कहते है ?
-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण
Answer:
-Answered by Raj Kumar On 14 April 2021:12:02:59 PM
Question 339. Asked on :10 April 2021:05:12:18 PM
-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण
Answer:
एक ही तत्त्व के ऐसे परमाणु जिसकी द्रव्यमान संख्या भिन्न - भिन्न एवं परमाणु संख्या एक सामान हो , उन्हे समस्थानिक कहते है |
-Answered by Raj Kumar On 14 April 2021:12:49:42 PM
Question 340. Asked on :10 April 2021:05:07:50 PM
संक्रमण तत्व किसे कहते है ?
-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण
Answer:
जिन तत्वों के बाह्यतम कक्षा एवं बाह्यतम कक्षा से पहले वाली कक्षा से अपूर्ण रूप से भरी हो उसे संक्रमण धातु या तत्व कहते है |
-Answered by Raj Kumar On 14 April 2021:12:59:45 PM
Question 341. Asked on :10 April 2021:05:01:20 PM
आधुनिक आवर्त सारणी मे कितने आवर्त और कितने उर्ध्व स्तंभ (समूह) हैं ?
-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण
Answer:
18 समूह और 7 आवृत
-Answered by Shruti Srivastva On 13 April 2021:12:55:56 PM
Question 342. Asked on :10 April 2021:04:57:15 PM
अक्रिय गैसे किसे कहते है ?
-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण
Answer:
18 समूह के सभी तत्त्व
-Answered by Shruti Srivastva On 13 April 2021:12:56:40 PM
Question 343. Asked on :10 April 2021:04:54:05 PM
अष्टक का नियम बताए ?
-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण
Answer:
यदि तत्वों को उनके बढ़ते हुए परमाणु द्रव्यमान के क्रम मे रखा जाए तो प्रत्येक आठवाँ तत्व एवं प्रथम तत्व के समानता पायी जाती है | इसे न्युलैडस का अष्टक का नियम कहते है |
-Answered by Raj Kumar On 14 April 2021:01:04:42 PM
Question 344. Asked on :10 April 2021:04:52:06 PM
संयोजकता किसे कहते है ?
-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण
Answer:
-Answered by Raj Kumar On 12 April 2021:05:06:27 PM
Question 345. Asked on :10 April 2021:04:44:30 PM
-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण
Answer:
" तत्वों के भौतिक एवं रासायनिक गुण उनके परमाणु संख्या के आवर्त फलन होते है |" इसे आधुनिक आवर्त सारणी नियम कहते है |
-Answered by Raj Kumar On 14 April 2021:01:12:58 PM
Question 346. Asked on :10 April 2021:02:23:42 PM
धातुओ के भौतिक गुणधर्म बताए ?
-Added by Raj Kumar Science » धातु एवं अधातु
Answer:
(1) पारा को छोड़कर अन्य सभी धातुएँ सामान्य ताप पर ठोस अवस्था मे होती है |
(2) धातुओ कि अपनी विशेष चमक होती है |
(3) ये ताप एवं विधुत कि सुचालक होती है |
(4) ये अघातवर्ध्य तथा तन्य होती है |
-Answered by Raj Kumar On 10 April 2021:04:23:02 PM
Question 347. Asked on :10 April 2021:02:21:09 PM
-Added by Raj Kumar Science » धातु एवं अधातु
Answer:
आवर्त सारणी मे धातुओ को बायीं तरफ तथा मध्य मे रखा जाता है जबकि अधातुओ को दायी तरफ रखा गया है |
-Answered by Raj Kumar On 10 April 2021:04:23:22 PM
Question 348. Asked on :10 April 2021:02:17:57 PM
कैरट किसे कहते है ?
-Added by Raj Kumar Science » धातु एवं अधातु
Answer:
यह सोने की शुद्धता आंकने कि इकाई है | इस इकाई मे 100% शुद्ध सोने को 24 कैरट कहते है |
-Answered by Raj Kumar On 10 April 2021:02:40:48 PM
Question 349. Asked on :10 April 2021:02:15:46 PM
भर्जन किसे कहते है ?
-Added by Raj Kumar Science » धातु एवं अधातु
Answer:
सल्फाइड अयस्क को वायु की उपस्तिथि मे अधिक ताप पर गर्म करने पर यह ऑक्साइड मे परिवर्तित हो जाता है | इस प्रक्रिया को भर्जन कहते है |
-Answered by Raj Kumar On 10 April 2021:04:09:07 PM
Question 350. Asked on :10 April 2021:02:13:44 PM
-Added by Raj Kumar Science » धातु एवं अधातु
Answer:
चोट करने पर एक विशेष ध्वनि उत्पन्न करना सोनरता या सोनोरस (ध्वानिक) कहलाता है
-Answered by Raj Kumar On 10 April 2021:04:16:14 PM
Question 351. Asked on :10 April 2021:02:11:11 PM
धात्विक चमक किसे कहते है ?
-Added by Raj Kumar Science » धातु एवं अधातु
Answer:
-Answered by Raj Kumar On 10 April 2021:04:04:54 PM
Question 352. Asked on :10 April 2021:02:02:43 PM
खनिज किसे कहते है ?
-Added by Raj Kumar Science » धातु एवं अधातु
Answer:
वे तत्त्व जो प्राकर्तिक भुपप्प्ती पर प्राकर्तिक रूप से पाए जाते है
-Answered by Shruti Srivastva On 13 April 2021:12:57:40 PM
Question 353. Asked on :10 April 2021:01:26:00 PM
संक्षारण क्या है तथा उसके रोकथाम के उपाय बताइए ?
-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण
Answer:
संक्षारण - जब कोई धातु अपने आसपास अम्ल , नमी आदि के संपर्क मे आती है तब यह संक्षारित होती है और इस प्रक्रिया को संक्षारण कहते है |
संक्षारण की रोकथाम के उपाये -
(i) तेल लगाकर (ii) पेंट लगाकर
(iii) गंधकीकरन द्वारा (iv)वार्निश के उपयोग द्वारा
-Answered by Raj Kumar On 14 April 2021:01:18:04 PM
Question 354. Asked on :10 April 2021:01:23:38 PM
संयुक्त अभिक्रिया किसे कहते हैं ?
-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण
Answer:
वह अभिक्रिया जिसमे दो या दो से अधिक अभिकारक मिलकर एकल उत्पाद का निर्माण करते है उसे संयुक्त अभिक्रिया कहते है
-Answered by Raj Kumar On 10 April 2021:01:43:07 PM
Question 355. Asked on :10 April 2021:01:21:13 PM
अभिकारक क्या है ?
-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण
Answer:
वे पदार्थ जो रासायनिक अभिक्रिया मे भाग लेते है , अभिकारक कहलाते है |
-Answered by Raj Kumar On 10 April 2021:01:47:15 PM
Question 356. Asked on :10 April 2021:01:18:20 PM
संतुलित रासायनिक समीकरण क्या हैं ?
-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण
Answer:
2HNO3 + Ca (OH)2 → Ca(NO3)2 +2H2O
इसमें अभिकारक और उत्पाद के ओर के सभी परमाणुओं की संख्या समान है अत: यह संतुलित रासायनिक समीकरण है |
-Answered by Master Mind On 10 April 2021:02:09:09 PM
Question 357. Asked on :10 April 2021:01:10:25 PM
समीकरण किसे कहते हैं
-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण
Answer:
जब किसी रासयनिक अभिक्रिया को संकेतो अथवा सूत्रों के माध्यम से व्यक्त किया जाता है तो इसे समीकरण या रासायनिक समीकरण कहते है
-Answered by Raj Kumar On 10 April 2021:01:34:30 PM
Question 358. Asked on :10 April 2021:12:48:49 PM
शब्द समीकरण क्या दर्शाता है
-Added by Raj Kumar Science » रसयानिक अभिक्रियाएँ अवम समीकरण
Answer:
कोई शब्द् समीकरण अभिकारकों के उत्पादों में परिवर्तन को इस के मध्य एक तीर के निशान द्वारा दर्शाता है शब्द समीकरण कहते हैं
-Answered by Raj Kumar On 10 April 2021:01:04:28 PM
Question 359. Asked on :10 April 2021:12:41:56 PM
कंकाली रासयानिक समीकरण क्या है ?
-Added by Raj Kumar Science » रसयानिक अभिक्रियाएँ अवम समीकरण
Answer:
यदि अभिक्रिया के बाद एवं पहले समीकरण के दोनों और का द्रव्यमान बराबर नहीं होता है तो ऐसा समीकरण कंकाली रासायनिक समीकरण कहलाता है
-Answered by Raj Kumar On 10 April 2021:12:58:33 PM
Question 360. Asked on :09 April 2021:05:16:25 PM
गुरुत्वाकर्षण बल किसे कहते हैं ?
-Added by Raj Kumar Science » गुरुत्वाकर्षण
Answer:
ब्रहमांड मे पदार्थ का प्रत्येक कण प्रत्येक दुसरे कण को अपनी ओर आकर्षित करता है | इस सर्वव्यापी आकर्षण बल को गुरुत्वाकर्षण बल कहते है
-Answered by Raj Kumar On 09 April 2021:05:20:06 PM
Question 361. Asked on :30 September 2020:03:59:14 AM
एक 50 g द्रव्यमान की गोली 4 kg द्रव्यमान की रायफल से 35 ms-1 के प्रारंभिक वेग से छोड़ी जाती है। रायफल के प्रारंभिक प्रतिक्षेपित वेग की गणना कीजिए।
-Added by Master Mind Science » Force And Laws Of Motion
Answer:
रायफल का द्रव्यमान M = 4 kg
गोली का द्रव्यमान m = 50 g = 0.050 kg
गोली का प्रारंभिक वेग u = 0 ms-1
गोली की अंतिम वेग v = 35 ms-1
राइफल का प्रारंभिक वेग U = 0 ms-1
राइफल का प्रतिक्षेपित वेग V = ?
गोली छूटने के पहले का संवेग = MU + mu
= 4 × 0 + 0.050 × 0
= 0 kg ms-1
गोली छूटने के बाद का संवेग = MV + mv
= 4 × V + 0.050 × 35
= 4V + 1.750 kg ms-1
संवेग संरक्षण के नियम से
गोली छूटने के बाद का संवेग = गोली छूटने के पहले का संवेग
4V + 1.750 = 0
4V = - 1.750
V = - 1.7504 = - 0.4375 ms-1
-Answered by Master Mind On 30 September 2020:03:59:53 AM
Question 362. Asked on :30 September 2020:02:19:34 AM
किसी व्यक्ति का औसत श्रव्य परास 20 Hz से 20 kHz है। इन दो आवृत्तियों के लिए ध्वनि तरंगों की तरंगदैर्घ्य ज्ञात कीजिए। वायु में ध्वनि का वेग 344 m s–1 लीजिए।
-Added by Master Mind Science » Sound
Answer:
-Answered by Master Mind On 30 September 2020:02:20:34 AM
Question 363. Asked on :30 September 2020:02:16:51 AM
दो बालक किसी ऐलुमिनियम पाइप के दो सिरों पर हैं। एक बालक पाइप के एक सिरे पर पत्थर से आघात करता है। दूसरे सिरे पर स्थित बालक तक वायु तथा ऐलुमिनियम से होकर जाने वाली ध्वनि तरंगों द्वारा लिए गए समय का अनुपात ज्ञात कीजिए।
-Added by Master Mind Science » Sound
Answer:
-Answered by Master Mind On 30 September 2020:02:19:12 AM
Question 364. Asked on :30 September 2020:02:15:28 AM
किसी ध्वनि ड्डोत की आवृत्ति 100 Hz है। एक मिनट में यह कितनी बार कंपन करेगा?
-Added by Master Mind Science » Sound
Answer:
-Answered by Master Mind On 30 September 2020:02:15:50 AM
Question 365. Asked on :30 September 2020:02:13:17 AM
500 मीटर ऊँची किसी मीनार की चोटी से एक पत्थर मीनार के आधार पर स्थित एक पानी के तालाब में गिराया जाता है। पानी में इसके गिरने की ध्वनि चोटी पर कब सुनाई देगी? (g = 10 m s-2 तथा ध्वनि की चाल = 340 m s-1)
-Added by Master Mind Science » Sound
Answer:
-Answered by Master Mind On 30 September 2020:02:14:12 AM
Question 366. Asked on :30 September 2020:02:11:42 AM
सोनार की कार्यविधि तथा उपयोगों का वर्णन कीजिए।
-Added by Master Mind Science » Sound
Answer:
सोनार (SONAR) शब्द का पूरा नाम Sound Navigation And Ranging है |
सोनार एक युक्ति है। जिसमें जल में स्थित पिंडों की दूरी, दिशा, तथा चाल मापने के लिए पराध्वनि तरंगों का उपयोग किया जाता है। यह एक यंत्र है जिसमें एक प्रेषित्र तथा एक संसूचक होता है और इसे नाव या जहाज में लगाया जाता है।
सोनार तकनीक का उपयोग:
सोनार की तकनीक का उपयोग समुद्र की गहराई ज्ञात करने तथा जल के अंदर स्थित चट्टानो, घाटियों, पनडुब्बियों, हिमशैल, डुबे हुए जहाज आदि की जानकारी प्राप्त करने के लिए किया जाता है।
-Answered by Master Mind On 30 September 2020:02:12:17 AM
Question 367. Asked on :30 September 2020:02:09:38 AM
किसी धातु के ब्लॉक में दोषों का पता लगाने के लिए पराध्वनि का उपयोग कैसे किया जाता है वर्णन कीजिए।
-Added by Master Mind Science » Sound
Answer:
धत्विक घटकों को प्रायः बड़े-बड़े भवनों, पुलों, मशीनों तथा वैज्ञानिक उपकरणों को बनाने के लिए उपयोग में लाया जाता है। धातु के ब्लॉकों में विद्यमान दरार या छिद्र जो बाहर से दिखाई नहीं देते, भवन या पुल की संरचना की मशबूती को कम कर देते हैं। पराध्वनि तरंगें धातु के ब्लॉक से गुजारी जाती हैं और प्रेषित तरंगों का पता लगाने के लिए संसूचकों का उपयोग किया जाता है। यदि थोड़ा-सा भी दोष होता है, तो पराध्वनि तरंगें परावर्तित हो जाती हैं जो दोष की उपस्थिति को दर्शाती है |
-Answered by Master Mind On 30 September 2020:02:10:20 AM
Question 368. Asked on :30 September 2020:02:07:31 AM
अनुरणन क्या है? इसे कैसे कम किया जा सकता है?
-Added by Master Mind Science » Sound
Answer:
ध्वनि का दीवारों से बारंबार परावर्तन जिसके कारण ध्वनि-निर्बंध होता है, अनुरणन कहलाता है |
अनुरणन के कारण ध्वनि साफ नहीं सुनाई देती है सुनने में बाधा उत्पन्न होता है | अनुरणन अवांछनीय है इसे कम करने की आवश्यकता होती है |
इसे निम्नलिखित तरीके से कम किया जा सकता है |
(i) इसे कम करने के लिए भवनों में पर्दे लटकाये जाते हैं, ताकि ध्वनि का अवशोषण हो सके |
(ii) कमरे या सभागारों में श्रोताओं की उपस्थिति बढ़ाने से, इससे भी ध्वनि का अवशोषण होता है |
(iii) इसे कम करने के लिए संपीडित फाइबर बोर्ड, खुरदरे प्लास्टर आदि लगाया जाता है |
(iv) सीटों के पदार्थ सही चुनाव भी ध्वनि अवशोषक के रूप में कार्य करते हैं |
-Answered by Master Mind On 30 September 2020:02:07:51 AM
Question 369. Asked on :30 September 2020:02:06:08 AM
चमगादड़ अपना शिकार पकड़ने के लिए पराध्वनि का उपयोग किस प्रकार करता है? वर्णन कीजिए।
-Added by Master Mind Science » Sound
Answer:
चमगादड़ गहन अंधकार में अपने भोजन को खोजने के लिए उड़ते समय पराध्वनि तरंगें उत्सर्जित करता है तथा परावर्तन के पश्चात् इनका संसूचन करता है। चमगादड़ द्वारा उत्पन्न उच्च तारत्व के पराध्वनि स्पंद अवरोधें या कीटों से परावर्तित होकर चमगादड़ के कानों तक पहुँचते हैं । इन परावर्तित स्पंदों की प्रकृति से चमगादड़ को पता चलता है कि अवरोध् या कीट कहाँ पर है और यह किस प्रकार का है पता लगा लेते है और आसानी से अपने शिकार तक पहुँच जाते हैं |
-Answered by Master Mind On 30 September 2020:02:06:49 AM
Question 370. Asked on :30 September 2020:02:02:43 AM
एक पनडुब्बी पर लगी एक सोनार युक्ति, संकेत भेजती है और उनकी प्रतिध्वनि 5 s पश्चात् ग्रहण करती है। यदि पनडुब्बी से वस्तु की दूरी 3625 m हो तो ध्वनि की चाल की गणना कीजिए।
-Added by Master Mind Science » Sound
Answer:
प्रतिध्वनि का समय t = 5 sec
पानी में ध्वनि की चाल v = ?
d = v × t2
v × t = 2d
v = 2dt
पानी में ध्वनि की चाल = 2 × 36255 = 1450 ms-1
-Answered by Master Mind On 30 September 2020:02:04:30 AM
Question 371. Asked on :20 August 2020:06:10:37 PM
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
-Answered by nisha sheikh On 22 August 2020:09:52:04 AM
Question 372. Asked on :20 August 2020:06:10:13 PM
-Added by Shruti Srivastva Science » Metal And Non Metals
Answer:
-Answered by nisha sheikh On 22 August 2020:09:54:16 AM
Question 373. Asked on :06 August 2020:05:42:36 PM
What are matter?
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
Matter, material substance that constitutes the observable universe and, together with energy, forms the basis of all objective phenomena.
-Answered by Shruti Srivastva On 23 September 2020:05:34:26 PM
Question 374. Asked on :06 August 2020:05:41:11 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Question 375. Asked on :06 August 2020:05:40:54 PM
What are solute?
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:35:38 PM
Question 376. Asked on :06 August 2020:05:40:16 PM
What is solute?
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:36:05 PM
Question 377. Asked on :06 August 2020:05:39:47 PM
What are heterogeneous?
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:36:51 PM
Question 378. Asked on :06 August 2020:05:39:25 PM
What is heterogeneous?
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:37:06 PM
Question 379. Asked on :06 August 2020:05:39:08 PM
What are hoemegeneous?
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:37:19 PM
Question 380. Asked on :06 August 2020:05:38:48 PM
What is homegeneous?
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:39:49 PM
Question 381. Asked on :06 August 2020:05:37:47 PM
What are solution?
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:40:20 PM
Question 382. Asked on :06 August 2020:05:37:19 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:40:36 PM
Question 383. Asked on :06 August 2020:05:37:00 PM
-Added by Shruti Srivastva Science » Cell Structure And Function
Answer:
-Answered by Shruti Srivastva On 27 August 2020:06:01:03 PM
Question 384. Asked on :06 August 2020:05:35:28 PM
-Added by Shruti Srivastva Science » Cell Structure And Function
Answer:
-Answered by Shruti Srivastva On 27 August 2020:06:01:27 PM
Question 385. Asked on :06 August 2020:05:26:54 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:41:39 PM
Question 386. Asked on :06 August 2020:05:26:20 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
concrete.
-Answered by Shruti Srivastva On 23 September 2020:05:41:55 PM
Question 387. Asked on :06 August 2020:05:25:43 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
oil and water.
-Answered by Shruti Srivastva On 23 September 2020:05:42:35 PM
Question 388. Asked on :06 August 2020:05:25:14 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:43:19 PM
Question 389. Asked on :06 August 2020:05:24:40 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
sugar solution
-Answered by Shruti Srivastva On 23 September 2020:05:43:37 PM
Question 390. Asked on :06 August 2020:05:24:21 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:44:05 PM
Question 391. Asked on :06 August 2020:05:22:45 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:44:49 PM
Question 392. Asked on :06 August 2020:05:22:12 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
yes.
-Answered by Shruti Srivastva On 23 September 2020:05:45:24 PM
Question 393. Asked on :06 August 2020:05:21:36 PM
-Added by Shruti Srivastva Science » Is Matter Around Us Pure
Answer:
no
-Answered by Shruti Srivastva On 23 September 2020:05:45:44 PM
Question 394. Asked on :06 August 2020:05:20:58 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:45:54 PM
Question 395. Asked on :06 August 2020:05:20:27 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:46:07 PM
Question 396. Asked on :06 August 2020:05:19:55 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:46:26 PM
Question 397. Asked on :06 August 2020:05:19:27 PM
-Added by Shruti Srivastva Science » Atoms And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:46:43 PM
Question 398. Asked on :06 August 2020:05:19:09 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:47:01 PM
Question 399. Asked on :06 August 2020:05:18:22 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:47:13 PM
Question 400. Asked on :06 August 2020:05:17:55 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:47:36 PM
Question 401. Asked on :06 August 2020:05:16:38 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:47:48 PM
Question 402. Asked on :06 August 2020:05:16:05 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:48:13 PM
Question 403. Asked on :06 August 2020:05:15:41 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:48:53 PM
Question 404. Asked on :06 August 2020:05:15:13 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:49:08 PM
Question 405. Asked on :06 August 2020:05:13:44 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:49:34 PM
Question 406. Asked on :06 August 2020:05:13:23 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:49:54 PM
Question 407. Asked on :06 August 2020:05:13:02 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:50:35 PM
Question 408. Asked on :06 August 2020:05:12:40 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:50:48 PM
Question 409. Asked on :06 August 2020:05:11:58 PM
-Added by Shruti Srivastva Science » Atom And Molecules
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:51:08 PM
Question 410. Asked on :03 June 2020:11:57:39 AM
-Added by Shruti Srivastva Science » Cell
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:51:19 PM
Question 411. Asked on :03 June 2020:11:55:37 AM
-Added by Shruti Srivastva Science » Cell
Answer:
Ophigolossum
-Answered by Shruti Srivastva On 03 June 2020:11:56:19 AM
Question 412. Asked on :03 June 2020:11:53:56 AM
-Added by Shruti Srivastva Science » Cells
Answer:
Mymercetia
-Answered by Shruti Srivastva On 03 June 2020:11:55:14 AM
Question 413. Asked on :03 June 2020:11:52:15 AM
Which organism have the smallest number of chromosomes?
-Added by Shruti Srivastva Science » Cell
Answer:
Mymercetia
-Answered by Shruti Srivastva On 03 June 2020:11:53:29 AM
Question 414. Asked on :03 June 2020:11:43:30 AM
-Added by Shruti Srivastva Science » Cell
Answer:
When cell is about to divide.
-Answered by Shruti Srivastva On 03 June 2020:11:45:28 AM
Question 415. Asked on :03 June 2020:11:41:49 AM
What is the full form of RNA?
-Added by Shruti Srivastva Science » Cell
Answer:
Ribonucleic acid
-Answered by Shruti Srivastva On 03 June 2020:11:42:45 AM
Question 416. Asked on :03 June 2020:11:38:28 AM
Ribonucleic acid
-Added by Shruti Srivastva Science » Cell
Answer:
-Answered by Shruti Srivastva On 23 September 2020:05:51:52 PM
Question 417. Asked on :03 June 2020:11:32:34 AM
How many chromosomes are in human beings?
-Added by Shruti Srivastva Science » Cell
Answer:
46
-Answered by Shruti Srivastva On 03 June 2020:11:36:28 AM
Question 418. Asked on :02 June 2020:02:19:03 AM
Tea plantation required rainfall of_______.
-Added by Master Purushottam Science » Crop Production And Management
Answer:
Tea plantation required annual rainfall
-Answered by Shruti Srivastva On 03 June 2020:11:50:12 AM
Question 419. Asked on :31 May 2020:12:29:50 AM
-Added by Master Purushottam Science » Diffusion
Answer:
Rate of diffusion is a characteristics of matter based on movement of the particles. In occurs in all state of matter but it fastest in case of gases, followed by liquid and slowest in solids.
-Answered by Nishant Verma On 01 June 2020:02:49:13 PM
Question 420. Asked on :26 May 2020:01:58:58 PM
Write the unit of kelvin scale?
-Added by Manisha kumari Science » Matter In Our Surroundings
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:06:34 PM
Question 421. Asked on :26 May 2020:09:48:29 AM
What is plasmolysis?
-Added by Nishant Verma Science » Ch 5
Answer:
When a living plant cell loses water through osmosis to there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.
-Answered by Nishant Verma On 26 May 2020:09:49:06 AM
Question 422. Asked on :26 May 2020:09:31:44 AM
What is Endocytosis?
-Added by Nishant Verma Science » Ch 5
Answer:
The flexibility of the cell membrane also enables to cell to engulf in food and other materials from its external environment. Such process is known as Endocytosis.
-Answered by Nishant Verma On 26 May 2020:09:42:52 AM
Question 423. Asked on :26 May 2020:09:30:38 AM
Who discovered cell and when? And how?
-Added by Nishant Verma Science » Ch 1
Answer:
Robert Hooke.
-Answered by Shruti Srivastva On 24 August 2020:05:07:02 PM
Question 424. Asked on :26 May 2020:09:25:35 AM
Arrange the following substances in increasing order for forces of attraction between particles - water, sugar, oxygen.
-Added by Nishant Verma Science » Ch 1
Answer:
Oxygen < Water < Sugar.
-Answered by Nishant Verma On 26 May 2020:09:29:11 AM
Question 425. Asked on :26 May 2020:09:24:46 AM
What type of clothes should we wear in Summer.
-Added by Nishant Verma Science » Ch 1
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:07:44 PM
Question 426. Asked on :26 May 2020:09:13:58 AM
Why are be able to sip hot tea or more milk faster from a saucer rather than a cup?
-Added by Nishant Verma Science » Ch 1
Answer:
A liquid has a larger surface in a saucer. than in a cup thus it vaporates faster and cool faster in a saucer than in a cup.
-Answered by Nishant Verma On 26 May 2020:09:15:49 AM
Question 427. Asked on :26 May 2020:08:54:05 AM
Suggest a method to liquify atmospheric gases?
-Added by Nishant Verma Science » Ch 1
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:08:23 PM
Question 428. Asked on :26 May 2020:08:52:50 AM
For any substances why does the temperature remain constant during the change of state?
-Added by Nishant Verma Science » Ch 1
Answer:
The temperature remain constant during the change of state because by increasing the pressure and reducing the temperature.
-Answered by Nishant Verma On 26 May 2020:09:21:52 AM
Question 429. Asked on :26 May 2020:08:51:05 AM
What is thealting point of ice?
-Added by Nishant Verma Science » Ch 1
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:09:14 PM
Question 430. Asked on :26 May 2020:08:34:30 AM
Which has more density of solid/liquid/gas?
-Added by Nishant Verma Science » Ch 1
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:09:58 PM
Question 431. Asked on :26 May 2020:08:33:45 AM
Write different state of matter?
-Added by Nishant Verma Science » Ch 1
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:10:20 PM
Question 432. Asked on :25 May 2020:01:39:45 PM
What are the major division of the Planter? What are the basis for these divisions.
-Added by Nishant Verma Science » Ch 1
Answer:
The major five divisions in kingdom plantea are:-
1. Thallophyta. 2. Bryophyta. 3.Pteridophyta. 4. Gynosperms. 5. Angiosperms.
(i) whether the plant body has well differentiated, distinct components.
(ii) Whether the differentiated plant body has special tissue for the transport of water and other substances.
(iii) The ability to bear seeds
(iv) Whether the seeds are enclosed within fruits.
-Answered by Nishant Verma On 25 May 2020:01:47:10 PM
Question 433. Asked on :25 May 2020:01:37:56 PM
How would you choose between two characters to be used for developing a hierarchy in classification?
-Added by Nishant Verma Science » Ch 1
Answer:
We choose that characters which depends on the first characterstics and determines the rest variety.
-Answered by Nishant Verma On 25 May 2020:01:45:32 PM
Question 434. Asked on :25 May 2020:01:36:30 PM
What are the advantages of classification organisms?
-Added by Nishant Verma Science » Ch 1
Answer:
(i)502It makes the study of different kinds of organisms much easier.
(ii)It helps us understanding the evolution of organisms.
(iii)It tells relation among the various classes of organisms.
(iv)It helps in a development of other life science.
-Answered by Nishant Verma On 25 May 2020:01:41:53 PM
Question 435. Asked on :25 May 2020:12:24:48 PM
Which division among plant has the simplest organisms.
-Added by Nishant Verma Science » Ch 1
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:11:03 PM
Question 436. Asked on :25 May 2020:12:22:57 PM
In which kingdom will you place or organism which is single called, ekaryotic and photosynthetic.
-Added by Nishant Verma Science » Ch 2
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:11:33 PM
Question 437. Asked on :25 May 2020:12:20:34 PM
What is the criterion for classification of organism to belonging to kingdom Monera or protista ?
-Added by Nishant Verma Science » Ch 2
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:12:06 PM
Question 438. Asked on :25 May 2020:12:19:46 PM
Which of the following are chemical change?
-Added by Nishant Verma Science » Ch 2
Answer:
(i)Growth of a plant.
(ii)Rusting of iron.
(iii)Cooking of food.
(iv)Digestion of food.
(v)Burning of candle.
-Answered by Nishant Verma On 25 May 2020:12:49:33 PM
Question 439. Asked on :25 May 2020:12:15:46 PM
Classify the following into element, compounds and mixtures.
-Added by Nishant Verma Science » Ch 2
Answer:
Element: Sodium, Silver, Tin and silicon.
Compounds: Calcium Carbonate, Methane and C02.
Mixtures: Soil, Sugar, Coal, Air, Soap and blood.
-Answered by Nishant Verma On 25 May 2020:12:33:08 PM
Question 440. Asked on :25 May 2020:12:14:36 PM
Which of the following will show the "Tyndall to effect" ?
-Added by Nishant Verma Science » Ch 2
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:13:01 PM
Question 441. Asked on :25 May 2020:12:10:55 PM
Identify the solution among the following mixtures.
-Added by Nishant Verma Science » Ch 2
Answer:
Sea water, air and soda water.
-Answered by Shruti Srivastva On 24 August 2020:05:13:36 PM
Question 442. Asked on :25 May 2020:09:11:51 AM
Which of the following material fall in the category of a "pure substances" ?
-Added by Nishant Verma Science » Ch 2
Answer:
(i) Ice
(ii) Iron.
(iii) Hydrochloric acid.
(iv) Calcium oxide.
(v) Mercury.
-Answered by Nishant Verma On 25 May 2020:09:19:22 AM
Question 443. Asked on :25 May 2020:09:10:26 AM
How would you confirm that a colorless liquid given to you is pure water?
-Added by Nishant Verma Science » Ch 2
Answer:
Take a sample of colourless liquid and put on stove if it starts boiling exactly at 100° C then it is pure water.
-Answered by Nishant Verma On 25 May 2020:09:17:31 AM
Question 444. Asked on :25 May 2020:09:06:10 AM
-Added by Nishant Verma Science » Ch 2
Answer:
Homogenoeus Mixture - Soda, water, air, vinegar, filterated tea.
Hetrogeneous Mixture - Wood, soil, air.
-Answered by Nishant Verma On 25 May 2020:09:14:40 AM
Question 445. Asked on :25 May 2020:08:30:24 AM
Classify the following as chemical or physical changes.
-Added by Nishant Verma Science » Ch 2
Answer:
(i) Melting of butter in a pan is a physical changes.
(ii) Rusting of almirah is a physical changes.
(iii) dissolving to common salt in water is a physical changes.
(iv) Passing of electric current, through water and the water breaking down into hydrogen and oxygen gases is a chemical change s.
-Answered by Nishant Verma On 25 May 2020:08:56:40 AM
Question 446. Asked on :25 May 2020:08:28:38 AM
What is the type of mixture is separated by the technique of crystallisation?
-Added by Nishant Verma Science » Ch 2
Answer:
The Crystallisation method is used to purify.
-Answered by Nishant Verma On 25 May 2020:08:55:41 AM
Question 447. Asked on :25 May 2020:08:26:30 AM
Write the point of differences between homogenoeus and hetrogeneous mixture.
-Added by Nishant Verma Science » Ch 2
Answer:
(a) Homogenoeus mixture
(i) The mixture with has uniform composition and it's composition cann't be itendified separately is known as Homogenoeus mixture.
(ii) For example - sugar in water, salt in sulphur, water in alcohol etc.
(b) Hetrogeneous mixture
(i) The mixture which has non - uniform composition can be identified separately is known as hetrogeneous mixtures.
(ii) For example - sand and salt, sugar and salt, water in oil and etc.
-Answered by Nishant Verma On 25 May 2020:08:44:07 AM
Question 448. Asked on :25 May 2020:08:25:52 AM
What is meant by a pure substance?
-Added by Nishant Verma Science » Ch 2
Answer:
A material that is composed of only one type of particles is called pure substance. All the constituent particles of a pure substances have same chemical nature.
-Answered by Nishant Verma On 25 May 2020:08:31:26 AM
Question 449. Asked on :24 May 2020:08:29:53 PM
Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
-Added by Nishant Verma Science » Ch 2
Answer:
First, water is taken has a solvent in a saucer pan. This water solvent is allowed to boil. During heating milk and tea leaves are added to the solvent in solutes. They perform a solution. Then the solution is powered through a strainer. The insoluble part of the solution remains on the strainer of residue. Suger added to the filterate, which dissolves in the filterate. The resulting solution is the required tea.
-Answered by Nishant Verma On 24 May 2020:08:49:48 PM
Question 450. Asked on :24 May 2020:08:28:55 PM
Fine mud particles suspended in water.
-Added by Nishant Verma Science » Ch 2
Answer:
-Answered by Shruti Srivastva On 24 August 2020:05:15:54 PM
Question 451. Asked on :24 May 2020:08:28:12 PM
Different pigments from an extract of flower petals.
-Added by Nishant Verma Science » Ch 2
Answer:
Chromatography.
-Answered by Nishant Verma On 24 May 2020:10:02:42 PM
Question 452. Asked on :24 May 2020:08:27:35 PM
Small pieces of metal in the engine oil or a car.
-Added by Nishant Verma Science » Ch 2
Answer:
Filtration.
-Answered by Nishant Verma On 24 May 2020:10:03:19 PM
Question 453. Asked on :24 May 2020:08:26:23 PM
Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
-Added by Nishant Verma Science » Ch 2
Answer:
Sublimation.
-Answered by Nishant Verma On 24 May 2020:10:03:53 PM
Question 454. Asked on :24 May 2020:08:25:10 PM
Sodium chloride from it's solution in water.
-Added by Nishant Verma Science » Chapter 2
Answer:
Evaporation.
-Answered by Nishant Verma On 24 May 2020:10:04:32 PM
Question 455. Asked on :24 May 2020:11:08:05 AM
Why is ice at 273 k more effective in cooling than water at the same temperature?
-Added by Nishant Verma Science » Ch 1
Answer:
Ice at 273 k has less energy than water although both are at the same temperature water possesses the additional latent heat of fusion. Hence, at 273 k ice is more effective in cooling than water.
-Answered by Nishant Verma On 24 May 2020:11:10:10 AM
Question 456. Asked on :24 May 2020:10:41:06 AM
(a)25° C. (b)0°C.
(c)100°C.
-Added by Nishant Verma Science » Ch 1
Answer:
(a)25° C = At 25°C Water is in the form of liquid.
(b)0° C = Both solid and liquid State.
(c)100° C = Both liquid and gas state.
-Answered by Nishant Verma On 24 May 2020:10:45:18 AM
Question 457. Asked on :24 May 2020:10:39:36 AM
We can get the smell of perfume sitting several meters away.
-Added by Nishant Verma Science » Ch 1
Answer:
Gaseous particles in posses high speed and large spaces between them particles of perfume diffuses into these gaseous particles at a very fast rate and reach our nostrils. This enables us to smell the perfume from a distance.
-Answered by Nishant Verma On 24 May 2020:11:04:07 AM
Question 458. Asked on :24 May 2020:10:38:27 AM
Naphthalene balls disappear with time without leaving any solid?
-Added by Nishant Verma Science » Ch 1
Answer:
Naphthalene undergoes sublimation easily i.e, the change state of naphthalene from solid to gas. takes place easily. Thus, naphthalene balls disappear with time without having any solids.
-Answered by Nishant Verma On 24 May 2020:10:59:03 AM
Question 459. Asked on :24 May 2020:10:37:06 AM
An iron almirah is a solid at room temperature?
-Added by Nishant Verma Science » Chapter 1
Answer:
An iron is a solid at room temperature because the iron is melting point is higher than 50°C.
-Answered by Nishant Verma On 24 May 2020:10:50:19 AM
Question 460. Asked on :24 May 2020:10:32:56 AM
-Added by Nishant Verma Science » Chapter 1 Matter In Our Surrounding
Answer:
At room temperature, water has no definite shape but have a volume that is, it occupies shape of the Container in which it is kept.
-Answered by Nishant Verma On 24 May 2020:10:34:26 AM
Question 461. Asked on :23 May 2020:09:02:55 PM
What is the other name of pseudopodia?
-Added by Shruti Srivastva Science » Cell
Answer:
False feet.
-Answered by Shruti Srivastva On 23 May 2020:09:04:23 PM
Question 462. Asked on :23 May 2020:09:00:56 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Eukaryotes.
-Answered by Shruti Srivastva On 23 May 2020:09:01:56 PM
Question 463. Asked on :23 May 2020:08:59:44 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Prokaryotes.
-Answered by Shruti Srivastva On 23 May 2020:09:00:28 PM
Question 464. Asked on :23 May 2020:08:58:29 PM
What are the types of ribosomes?
-Added by Shruti Srivastva Science » Cells
Answer:
70s and 80s.
-Answered by Shruti Srivastva On 23 May 2020:08:59:14 PM
Question 465. Asked on :23 May 2020:08:55:53 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Protein factory.
-Answered by Shruti Srivastva On 23 May 2020:08:57:35 PM
Question 466. Asked on :23 May 2020:08:53:44 PM
What does the SER makes?
-Added by Shruti Srivastva Science » Cell
Answer:
Lipids, steroids, detoxifies toxins and stored calcium.
-Answered by Shruti Srivastva On 23 May 2020:08:54:41 PM
Question 467. Asked on :23 May 2020:08:52:04 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Protein.
-Answered by Shruti Srivastva On 23 May 2020:08:52:58 PM
Question 468. Asked on :23 May 2020:08:48:52 PM
Where the SER found?
-Added by Shruti Srivastva Science » Cell
Answer:
Muscles.
-Answered by Shruti Srivastva On 23 May 2020:08:49:46 PM
Question 469. Asked on :23 May 2020:08:47:39 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Pancreatic cells.
-Answered by Shruti Srivastva On 23 May 2020:08:48:25 PM
Question 470. Asked on :23 May 2020:08:44:43 PM
-Added by Shruti Srivastva Science » Cell
Answer:
There are two types of endoplasmic reticulum:
1. RER
2. SER
-Answered by Shruti Srivastva On 23 May 2020:08:46:15 PM
Question 471. Asked on :23 May 2020:07:17:25 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Endoplasmic reticulum, Golgi, Lysosomes and vacoules.
-Answered by Shruti Srivastva On 23 May 2020:07:18:29 PM
Question 472. Asked on :23 May 2020:07:15:33 PM
Write one function of endomembrane system?
-Added by Shruti Srivastva Science » Cell
Answer:
Make modify protien.
-Answered by Shruti Srivastva On 23 May 2020:07:16:45 PM
Question 473. Asked on :23 May 2020:07:12:43 PM
What is endomembrane system?
-Added by Shruti Srivastva Science » Cell
Answer:
Network of membranes organelles.
-Answered by Shruti Srivastva On 23 May 2020:07:14:35 PM
Question 474. Asked on :23 May 2020:07:11:22 PM
Give an example of haploid?
-Added by Shruti Srivastva Science » Cell
Answer:
Bacteria.
-Answered by Shruti Srivastva On 23 May 2020:07:11:57 PM
Question 475. Asked on :23 May 2020:07:09:49 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Human beings.
-Answered by Shruti Srivastva On 23 May 2020:07:10:51 PM
Question 476. Asked on :23 May 2020:07:08:06 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Nitrous husband
Sugar
Phosphate.
-Answered by Shruti Srivastva On 23 May 2020:07:08:57 PM
Question 477. Asked on :23 May 2020:07:06:04 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Ophigolossum.
-Answered by Shruti Srivastva On 23 May 2020:07:07:14 PM
Question 478. Asked on :23 May 2020:07:04:42 PM
How many chromosomes are there in myrmectia?
-Added by Shruti Srivastva Science » Cell
Answer:
-Answered by Shruti Srivastva On 23 May 2020:07:05:51 PM
Question 479. Asked on :23 May 2020:07:03:31 PM
How many chromosome are there in human beings?
-Added by Shruti Srivastva Science » Cell
Answer:
46
-Answered by Shruti Srivastva On 23 May 2020:07:04:28 PM
Question 480. Asked on :23 May 2020:06:56:38 PM
How many pairs of chromosomes are there in human beings?
-Added by Shruti Srivastva Science » Cell
Answer:
46
-Answered by Shruti Srivastva On 23 May 2020:06:58:02 PM
Question 481. Asked on :23 May 2020:06:54:34 PM
By what things the chromatin fibres are made up of ?
-Added by Shruti Srivastva Science » Cell
Answer:
DNA and protein.
-Answered by Shruti Srivastva On 23 May 2020:06:56:07 PM
Question 482. Asked on :23 May 2020:06:52:32 PM
-Added by Shruti Srivastva Science » DNA
Answer:
1. Producing RNA.
2. Controlling Cell.
-Answered by Shruti Srivastva On 23 May 2020:06:53:25 PM
Question 483. Asked on :23 May 2020:06:49:31 PM
-Added by Shruti Srivastva Science » DNA
Answer:
Deoxyribonucleic.
-Answered by Shruti Srivastva On 23 May 2020:06:51:36 PM
Question 484. Asked on :23 May 2020:06:46:32 PM
In which year Robert Brown discovered nucleus?
-Added by Shruti Srivastva Science » Cells
Answer:
1831.
-Answered by Shruti Srivastva On 23 May 2020:06:48:19 PM
Question 485. Asked on :23 May 2020:06:44:12 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Robert Brown.
-Answered by Shruti Srivastva On 23 May 2020:06:45:51 PM
Question 486. Asked on :23 May 2020:06:42:43 PM
-Added by Shruti Srivastva Science » Cell
Answer:
1674
-Answered by Shruti Srivastva On 23 May 2020:06:43:52 PM
Question 487. Asked on :23 May 2020:06:40:44 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Antoine van Leeuwehoek.
-Answered by Shruti Srivastva On 23 May 2020:06:41:56 PM
Question 488. Asked on :23 May 2020:06:38:01 PM
-Added by Shruti Srivastva Science » Cell
Answer:
Primitive microscope.
-Answered by Shruti Srivastva On 23 May 2020:06:39:54 PM
Question 489. Asked on :23 May 2020:06:35:37 PM
Who discovered the cell first?
-Added by Shruti Srivastva Science » Cell
Answer:
Robert Hooke
-Answered by Shruti Srivastva On 23 May 2020:06:37:04 PM
Question 490. Asked on :16 May 2020:11:30:11 PM
प्रकाश संश्लेषण किसे कहते हैं ?
-Added by Master Mind Science » प्रकाश संश्लेषण
Answer:
Photosynthesis
-Answered by Nishant Verma On 23 May 2020:01:15:44 PM
Question 491. Asked on :16 May 2020:09:16:52 PM
Q convert the following temperature to Celsius scale?
(a) 573
-Added by Master Purushottam Science » Matter
Answer:
Sol: 573-273
= 300
-Answered by Master Purushottam On 16 May 2020:09:18:53 PM
Question 492. Asked on :16 May 2020:09:14:51 PM
Q convert the following temperature to Celsius scale?
(a) 300k
-Added by Master Purushottam Science » Temperture To Celcius
Answer:
Sol: 300-273 = 270c
-Answered by Master Purushottam On 16 May 2020:09:24:37 PM
Question 493. Asked on :27 April 2020:01:22:47 PM
Name the phenomenon due to which we get light from the sun before actual sun rise .
-Added by Khushi Chauhan Science » The Human Eye And The Colourful World
Answer:
Atmosphere refraction
-Answered by priyanshu kumar On 12 May 2020:08:39:51 PM
Question 494. Asked on :25 April 2020:12:27:27 PM
Name the digestive enzyme present in saliva.
-Added by Khushi Chauhan Science » Life Processes
Answer:
Ptyalin or salivary amylass
-Answered by priyanshu kumar On 13 May 2020:10:44:10 AM
Question 495. Asked on :24 April 2020:07:01:17 PM
What is genetic drift?
-Added by Khushi Chauhan Science » Heredity And Evolution
Answer:
Gane migration or gene flow from a population to a new area is known as genetic drift
-Answered by priyanshu kumar On 13 May 2020:10:46:31 AM
Question 496. Asked on :24 April 2020:06:59:43 PM
Define reproduction isolation.
-Added by Khushi Chauhan Science » Heredity And Evolution
Answer:
The inability of a spices to bread successfully with related spices due to geographical, behavioral, physiological, or genetic barriers or differences.
-Answered by Nishant Verma On 25 May 2020:02:00:21 PM
Question 497. Asked on :24 April 2020:06:55:51 PM
Define natural selection.
-Added by Khushi Chauhan Science » Heredity And Evolution
Answer:
Nature select the best trates in Spanish lading to the survival of fittes and evolution this phenomenon as a noun as natural selection
-Answered by priyanshu kumar On 13 May 2020:10:51:59 AM
Question 498. Asked on :24 April 2020:06:52:20 PM
Name the largest cell of human body.
-Added by Khushi Chauhan Science » Control And Coordination
Answer:
Neuron
-Answered by priyanshu kumar On 13 May 2020:10:55:20 AM
Question 499. Asked on :24 April 2020:06:51:12 PM
Name the largest part of the hind brain.
-Added by Khushi Chauhan Science » Control And Coordination
Answer:
Cerebellum
-Answered by priyanshu kumar On 13 May 2020:10:55:57 AM
Question 500. Asked on :24 April 2020:06:43:10 PM
Define pollutants.
-Added by Khushi Chauhan Science » Sustainable Management Of Natural Resources
Answer:
Pollutants aur substances that causes harmful change in the environment thereby producing adverese effects on leaving organisms
-Answered by priyanshu kumar On 13 May 2020:10:58:10 AM
Question 501. Asked on :22 March 2020:08:15:31 PM
Which is the more reactive metal?
-Added by Aman Senapati Science » Metal And Non Metals
Answer:
Potassium (k) is the most reactive metal
-Answered by priyanshu kumar On 13 May 2020:02:30:03 PM
Question 502. Asked on :18 February 2020:11:28:40 AM
What is meant by chloroplast?
-Added by Sohail alam Science » Our Earth
Answer:
Chloroplasts is a green pigment present is leaves of plants which give green colour of leaves
-Answered by priyanshu kumar On 13 May 2020:02:47:19 PM
Question 503. Asked on :07 February 2020:03:28:01 PM
Define stamen?
-Added by Suman Kumari Science » Science
Answer:
Stamen is a reproductive part of plant.
-Answered by priyanshu kumar On 17 February 2020:02:49:27 PM
Question 504. Asked on :07 February 2020:03:27:17 PM
Define pistil?
-Added by Suman Kumari Science » Science
Answer:
Pistil is a reproductive part of plant.
-Answered by priyanshu kumar On 17 February 2020:02:49:40 PM
Question 505. Asked on :07 February 2020:03:25:22 PM
Name the reproductive part o a plant?
-Added by Suman Kumari Science » Science
Answer:
Stamen and pistil.
-Answered by priyanshu kumar On 17 February 2020:02:49:57 PM
Question 506. Asked on :07 February 2020:09:44:31 AM
-Added by Akki chauhan Science » Electricity
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:50:22 PM
Question 507. Asked on :07 February 2020:09:40:02 AM
-Added by Akki chauhan Science » Life Process.
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:50:33 PM
Question 508. Asked on :07 February 2020:09:39:20 AM
-Added by Akki chauhan Science » Life Process
Answer:
-Answered by Akki chauhan On 07 February 2020:09:42:12 AM
Question 509. Asked on :07 February 2020:09:36:26 AM
-Added by Akki chauhan Science » Life Process
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:51:05 PM
Question 510. Asked on :03 February 2020:06:43:20 PM
-Added by Akki chauhan Science » Chemistry
Question 511. Asked on :03 February 2020:06:42:38 PM
-Added by Akki chauhan Science » Chemistry
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:51:34 PM
Question 512. Asked on :03 February 2020:06:41:54 PM
-Added by Akki chauhan Science » Chemistry
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:51:43 PM
Question 513. Asked on :03 February 2020:06:41:04 PM
-Added by Akki chauhan Science » Chemistry
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:51:53 PM
Question 514. Asked on :03 February 2020:06:19:10 PM
Explain the fleming's left hand rule.
-Added by Khushi Chauhan Science » Magnetic Effects Of Electricity
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:52:41 PM
Question 515. Asked on :31 January 2020:07:14:21 PM
Name excretory organ in amoeba and earthworm?
-Added by Himanshi Verma Science » Life Processes
Answer:
Amoeba- cell memebrane
Earthworm- outer covering (skin
-Answered by priyanshu kumar On 17 February 2020:02:53:17 PM
Question 516. Asked on :31 January 2020:07:13:07 PM
Woody plants carry gaseous exchange through?
-Added by Himanshi Verma Science » Life Processes
Answer:
Lenticles.
-Answered by priyanshu kumar On 17 February 2020:02:53:29 PM
Question 517. Asked on :31 January 2020:07:10:26 PM
-Added by Himanshi Verma Science » Life Processes
Answer:
The process by which blood is cleared of metabolic wastes in case o kidney failure is called dialysis.
-Answered by priyanshu kumar On 17 February 2020:02:53:38 PM
Question 518. Asked on :31 January 2020:07:09:17 PM
-Added by Himanshi Verma Science » Light
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:53:48 PM
Question 519. Asked on :31 January 2020:06:31:45 PM
What is reflection of light?
-Added by Himanshi Verma Science » Light
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:53:57 PM
Question 520. Asked on :26 January 2020:02:05:33 PM
Write the colours of sun ?
-Added by Manisha Kumari Science » Light And Reflection
Answer:
-Answered by priyanshu kumar On 17 February 2020:02:55:00 PM
Question 521. Asked on :14 January 2020:09:44:29 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:37:13 AM
Question 522. Asked on :14 January 2020:09:39:02 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:37:21 AM
Question 523. Asked on :14 January 2020:09:38:11 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:39:21 AM
Question 524. Asked on :14 January 2020:09:37:27 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:39:30 AM
Question 525. Asked on :14 January 2020:09:36:49 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:39:42 AM
Question 526. Asked on :14 January 2020:09:34:30 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:39:48 AM
Question 527. Asked on :14 January 2020:09:33:50 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:39:58 AM
Question 528. Asked on :14 January 2020:09:32:46 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:40:09 AM
Question 529. Asked on :14 January 2020:09:31:46 AM
-Added by Akki chauhan Science » Human Eye
Answer:
-Answered by A??k Pal On 15 January 2020:11:40:26 AM
Question 530. Asked on :14 January 2020:09:24:18 AM
-Added by Akki chauhan Science » Metal And Non Metals
Answer:
-Answered by A??k Pal On 16 January 2020:11:03:07 AM
Question 531. Asked on :14 January 2020:09:23:45 AM
-Added by Akki chauhan Science » Metal And Non Metals
Answer:
-Answered by A??k Pal On 16 January 2020:11:03:33 AM
Question 532. Asked on :09 January 2020:06:11:58 PM
What is the far point of the normal eye?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
Infinity.
-Answered by A??k Pal On 16 January 2020:11:03:45 AM
Question 533. Asked on :09 January 2020:06:06:21 PM
What are the different ways by which speciation takes place?
-Added by Himanshi Verma Science » Heredity And Evolution
Answer:
1. Gene flow: occurs between population that are partly but not completely separated.
2. Genetic Drift: It is the random change in the frequency of allels in a population over successive generations.
4. Geographical isolation: It is caused by mountain ranges, rivers etc. geographical isolation leads to reproductive isolation due to which there is no low of genes between seprated groups of population.
-Answered by A??k Pal On 16 January 2020:11:03:56 AM
Question 534. Asked on :09 January 2020:06:04:35 PM
What is evolution?
-Added by Himanshi Verma Science » Heredity And Evolution
Answer:
Evolution is the sequence of gradual changes which takes place in the primitive organisms, over million of years, in which new species are produced.
-Answered by A??k Pal On 16 January 2020:11:04:41 AM
Question 535. Asked on :09 January 2020:06:01:45 PM
Who was known as the father of genetics?
-Added by Himanshi Verma Science » Heredity And Evolution
Answer:
-Answered by priyanshu kumar On 15 January 2020:11:19:57 AM
Question 536. Asked on :08 January 2020:06:03:04 PM
What is catenation?
-Added by Himanshi Verma Science » Carbon And Its Compound
Answer:
Carbon can link with carbon atoms by means o covalent bonds to form long chains, branched chains and closed ring compound. Carbon atom may be linked by single, dpouble, or triple bonds.
-Answered by A??k Pal On 16 January 2020:11:05:04 AM
Question 537. Asked on :03 January 2020:07:40:00 PM
What is hydrocarbon?
-Added by Aarohi Chauhan Science » Carbon And Its Compound
Answer:
-Answered by A??k Pal On 16 January 2020:11:05:14 AM
Question 538. Asked on :03 January 2020:07:38:35 PM
What is soapanification?
-Added by Aarohi Chauhan Science » Carbon And Its Compound
Answer:
Saponification is a process by which triglycerides are reacted with sodium or potassium hydroxide (lye) to produce glycerol and a fatty acid salt, called "soap." The triglycerides are most often animal fats or vegetable oils.
-Answered by priyanshu kumar On 15 January 2020:11:20:23 AM
Question 539. Asked on :27 December 2019:07:10:10 PM
how many laws are having for reflection?
-Added by Aman Senapati Science » Light
Answer:
There are two laws of refection:-
1st law of reflection
The angle of incidence is equal to the angle of reflection or l_i=l_r.
2nd law of reflection
The incident ray, the normal at the point of incidence and the reflected ray lie on the same plane.
-Answered by Rohit Rajput On 29 December 2019:10:16:38 AM
Question 540. Asked on :27 December 2019:07:08:02 PM
Define Anode?
-Added by Aman Senapati Science » Chemical Effect Of Electric Current
Answer:
The electrode connected to the positive terminal of a cell or battery.
-Answered by priyanshu kumar On 15 January 2020:11:21:04 AM
Question 541. Asked on :27 December 2019:07:00:17 PM
Name the biggest plant in the world having largest bloom?
-Added by Aman Senapati Science » Plants.
Answer:
Rafflesia Arnoldii
-Answered by priyanshu kumar On 15 January 2020:11:21:13 AM
Question 542. Asked on :27 December 2019:06:46:04 PM
Define Cathode?
-Added by Aman Senapati Science » Chemical Effect Of Electric Current
Answer:
The electrode connected to the negative terminal of a cell or battery.
-Answered by priyanshu kumar On 15 January 2020:11:21:37 AM
Question 543. Asked on :27 December 2019:06:43:40 PM
Name two devices which can detect even a weak current?
-Added by Aman Senapati Science » Chemical Effect Of Electric Current
Answer:
LED and Magnetic Compass.
-Answered by priyanshu kumar On 15 January 2020:11:21:46 AM
Question 544. Asked on :20 December 2019:06:50:39 PM
Excess noise around us causes which pollution?
-Added by Aman Senapati Science » Sound
Answer:
Noise pollution.
-Answered by priyanshu kumar On 23 December 2019:09:08:56 AM
Question 545. Asked on :20 December 2019:06:47:47 PM
In a wind instrument,sound is produced by which column?
-Added by Aman Senapati Science » Sound
Answer:
Air column.
-Answered by priyanshu kumar On 23 December 2019:09:09:08 AM
Question 546. Asked on :20 December 2019:06:45:47 PM
In which medium does sound travel fastest?
-Added by Aman Senapati Science » Sound
Answer:
Solid medium.
-Answered by priyanshu kumar On 23 December 2019:09:09:24 AM
Question 547. Asked on :20 December 2019:06:43:02 PM
The loudness of sound is measured in which unit?
-Added by Aman Senapati Science » Sound
Answer:
Decibel[dB]
-Answered by priyanshu kumar On 23 December 2019:09:09:35 AM
Question 548. Asked on :20 December 2019:06:40:01 PM
What is the unit of frequency?
-Added by Aman Senapati Science » Sound
Answer:
Hazards.
-Answered by Rohit Rajput On 29 December 2019:10:19:23 AM
Question 549. Asked on :15 December 2019:10:34:06 AM
What is the distance between our Earth and the Sun?
-Added by Aman Senapati Science » Star And Solar System
Answer:
1.4 million kilometres.
-Answered by priyanshu kumar On 23 December 2019:09:12:46 AM
Question 550. Asked on :15 December 2019:10:31:52 AM
In which year Pluto and Xena come under the category of Dwarf Planet?
-Added by Aman Senapati Science » Stars And The Solar System
Answer:
[2003 UB]
-Answered by Rohit Rajput On 29 December 2019:10:20:03 AM
Question 551. Asked on :15 December 2019:10:27:55 AM
Define globular clusters?
-Added by Aman Senapati Science » Star And Solar System
Answer:
The clusters of stars in the constellation are called globular clusters.
-Answered by Rohit Rajput On 29 December 2019:10:20:13 AM
Question 552. Asked on :15 December 2019:10:24:05 AM
Which Dwarf planet is biggest in our galaxy?
-Added by Aman Senapati Science » Star And Solar System
Answer:
-Answered by Rohit Rajput On 29 December 2019:10:20:30 AM
Question 553. Asked on :15 December 2019:10:23:03 AM
Which star appears stationary?
-Added by Aman Senapati Science » Star And Solar System
Answer:
Pole star.
-Answered by Rohit Rajput On 29 December 2019:10:20:53 AM
Question 554. Asked on :15 December 2019:10:21:39 AM
How many constellation have been recognized and named?
-Added by Aman Senapati Science » Star And Solar System
Answer:
88
-Answered by Rohit Rajput On 29 December 2019:10:21:38 AM
Question 555. Asked on :15 December 2019:10:19:41 AM
On which temperature stars starts shining?
-Added by Aman Senapati Science » Star And Solar System
Answer:
2 to 5 million degree celsius.
-Answered by Rohit Rajput On 29 December 2019:10:21:50 AM
Question 556. Asked on :15 December 2019:10:03:19 AM
What is the temperature of moon during sunshines?
-Added by Aman Senapati Science » Stars And The Solar System
Answer:
123 degree C [253 Degree F]
-Answered by Rohit Rajput On 29 December 2019:10:22:03 AM
Question 557. Asked on :14 December 2019:08:18:29 PM
What is the another name of pole star?
-Added by Aman Senapati Science » Stars And The Solar System
Answer:
Dhruvatara.
-Answered by Rohit Rajput On 29 December 2019:10:22:21 AM
Question 558. Asked on :14 December 2019:08:16:57 PM
Neil Armstrong was landed on moon on which day?
-Added by Aman Senapati Science » Stars And The Solar System
Answer:
Dhruvatara.
-Answered by priyanshu kumar On 23 December 2019:09:15:34 AM
Question 559. Asked on :14 December 2019:08:15:36 PM
How much distance is having in between our Earth and Moon?
-Added by Aman Senapati Science » Star And Solar System
Answer:
3,84,400 km.
-Answered by Rohit Rajput On 29 December 2019:10:22:37 AM
Question 560. Asked on :14 December 2019:08:14:35 PM
How many hours having in a solar day?
-Added by Aman Senapati Science » Star And Solar System
Answer:
24 hours.
-Answered by Rohit Rajput On 29 December 2019:10:23:28 AM
Question 561. Asked on :14 December 2019:08:09:05 PM
Define phases of moon?
-Added by Aman Senapati Science » Star And Solar System
Answer:
The day-to-day changes in the size and shape of the moon as seen during a month are called phases of moon.
-Answered by Rohit Rajput On 29 December 2019:10:23:56 AM
Question 562. Asked on :14 December 2019:08:04:59 PM
What is the name of the day on which more than half of the moon is visible?
-Added by Aman Senapati Science » Star And Solar System
Answer:
Gibbous moon.
-Answered by Rohit Rajput On 29 December 2019:10:24:11 AM
Question 563. Asked on :14 December 2019:08:01:50 PM
What is the name of the day on which a small portion of moon is visible?
-Added by Aman Senapati Science » Star And Solar System
Answer:
Crescent moon.
-Answered by Rohit Rajput On 29 December 2019:10:24:26 AM
Question 564. Asked on :14 December 2019:08:00:26 PM
What is the name of the day on which a perfectly moon is visible?
-Added by Aman Senapati Science » Star And Solar System
Answer:
Full moon day.
-Answered by Rohit Rajput On 29 December 2019:10:24:46 AM
Question 565. Asked on :14 December 2019:07:58:15 PM
What is the name of the day on which moon is not visible?
-Added by Aman Senapati Science » Star And Solar System
Answer:
New moon day.
-Answered by Rohit Rajput On 29 December 2019:10:25:03 AM
Question 566. Asked on :14 December 2019:07:52:39 PM
How many stars are having in our galaxy?
-Added by Aman Senapati Science » Star And Solar System
Answer:
100 billion stars.
-Answered by Rohit Rajput On 29 December 2019:10:25:19 AM
Question 567. Asked on :14 December 2019:07:51:25 PM
What do mean by Supercluster?
-Added by Aman Senapati Science » Star And Solar System
Answer:
The Milky Way itself is only a tiny part of grouping of galaxies called a Supercluster.
-Answered by Rohit Rajput On 29 December 2019:10:25:31 AM
Question 568. Asked on :14 December 2019:07:50:34 PM
What is the shape of our galaxy?
-Added by Aman Senapati Science » Star And Solar System
Answer:
Our galaxy is a spiral type galaxy.
-Answered by Rohit Rajput On 29 December 2019:10:26:53 AM
Question 569. Asked on :14 December 2019:07:46:52 PM
What is Astronomy and Astronomers?
-Added by Aman Senapati Science » Star And Solar System
Answer:
The science that deals with the study of universe is called Astronomy and The scientists who study the universe are known as Astronomers.
-Answered by Rohit Rajput On 29 December 2019:10:28:41 AM
Question 570. Asked on :14 December 2019:07:43:12 PM
What is the another name of Milky Way Galaxy?
-Added by Aman Senapati Science » Stars And The Solar System
Answer:
Akash Ganga
-Answered by Rohit Rajput On 29 December 2019:10:28:55 AM
Question 571. Asked on :14 December 2019:07:15:05 PM
Why our galaxy known as 'Milky Way Galaxy'?
-Added by Aman Senapati Science » Stars And The Solar System
Answer:
Our galaxy is known as Milky Way Galaxy because it looks like a trail of milk split across the sky.
-Answered by Rohit Rajput On 29 December 2019:10:29:07 AM
Question 572. Asked on :10 December 2019:07:39:51 PM
What is sound?
-Added by Aman Senapati Science » Sound
Answer:
Sound is a form of energy which is produced by vibration.
-Answered by Suraj Kumar On 11 December 2019:08:27:41 AM
Question 573. Asked on :10 December 2019:07:13:00 PM
What are the types of instrument?
-Added by Aman Senapati Science » Sound
Answer:
Wind Instrument
Stringed Instrument
Percussion instruments
-Answered by priyanshu kumar On 11 December 2019:08:23:41 AM
Question 574. Asked on :10 December 2019:06:39:20 PM
What is the full form of LED?
-Added by Aman Senapati Science » Chemical Effects Of Electric Current
Answer:
Light Emitting Diode.
-Answered by Suraj Kumar On 11 December 2019:08:28:08 AM
Question 575. Asked on :10 December 2019:06:26:11 PM
which physicists first calculated the speed of sound?
-Added by Aman Senapati Science » Sound
Answer:
GIOVANI ALFONSO BORELLI AND VINCENZO VIVIANI
-Answered by Suraj Kumar On 11 December 2019:08:28:28 AM
Question 576. Asked on :10 December 2019:06:18:57 PM
What are the parts of human ear?
-Added by Aman Senapati Science » Sound
Answer:
1]Outer ear.
2]middle ear.
3]Inner ear.
-Answered by priyanshu kumar On 11 December 2019:08:24:07 AM
Question 577. Asked on :10 December 2019:06:15:02 PM
What are the kinds of friction?
-Added by Aman Senapati Science » Friction
Answer:
1]Static friction.
2]Sliding friction.
3]Rolling friction.
-Answered by priyanshu kumar On 11 December 2019:08:24:16 AM
Question 578. Asked on :10 December 2019:06:09:08 PM
What are the causes of friction?
-Added by Aman Senapati Science » Friction
Answer:
1] Due to the interlocking between the surfaces.
2]Due to force of adhesion between the two surfaces.
-Answered by Suraj Kumar On 11 December 2019:08:28:57 AM
Question 579. Asked on :10 December 2019:05:50:38 PM
Define Electrode?
-Added by Aman Senapati Science » Chemical Effect Of Electric Current
Answer:
The rod[or plate]through which electric current either enters or leaves an electrolytic solution.
-Answered by Suraj Kumar On 11 December 2019:08:29:11 AM
Question 580. Asked on :21 November 2019:09:07:23 AM
suggest three measure to protected ourselves lighting?
-Added by Sohail alam Science » Our Body
Answer:
-Answered by Sohail alam On 21 November 2019:09:09:20 AM
Question 581. Asked on :21 November 2019:09:04:45 AM
Explain why charged body loses its if we touch it with our hand
-Added by Sohail alam Science » Our Body
Answer:
-Answered by priyanshu kumar On 02 December 2019:08:32:55 AM
Question 582. Asked on :15 November 2019:03:22:28 PM
how do frogs respiration?
-Added by Suman Kumari Science » Science
Answer:
Lungs and skins.
-Answered by Suraj Kumar On 21 November 2019:08:38:47 AM
Question 583. Asked on :15 November 2019:03:20:29 PM
What is one breath?
-Added by Suman Kumari Science » Science
Answer:
A breath means on inhalation and exhalation plus.
-Answered by Suraj Kumar On 21 November 2019:08:39:12 AM
Question 584. Asked on :15 November 2019:03:18:33 PM
Name the respirately organised in cockroach?
-Added by Suman Kumari Science » Science
Answer:
Spiracles.
-Answered by Suraj Kumar On 21 November 2019:08:39:21 AM
Question 585. Asked on :15 November 2019:03:05:30 PM
Variation in the breathing rate during different activities?
-Added by Suman Kumari Science » Science
Answer:
Sleeping ,learning, cloth-washing , running ,walking.
-Answered by Suraj Kumar On 21 November 2019:08:39:31 AM
Question 586. Asked on :15 November 2019:03:04:35 PM
What is breathing rate?
-Added by Suman Kumari Science » Science
Answer:
The number of times a person breathes in a minute is termed as a breathing rate.
-Answered by Suraj Kumar On 21 November 2019:08:39:44 AM
Question 587. Asked on :15 November 2019:03:03:43 PM
What is breathing?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Suman Kumari On 15 November 2019:03:11:23 PM
Question 588. Asked on :15 November 2019:03:02:35 PM
What product the chest cavity?
-Added by Suman Kumari Science » Science
Answer:
This cavity is surrounded by ribs on the side rib cage.
-Answered by Suraj Kumar On 21 November 2019:08:40:21 AM
Question 589. Asked on :15 November 2019:02:58:58 PM
Where lungs are situated ?
-Added by Suman Kumari Science » Science
Answer:
Lungs are situated in chest cavity.
-Answered by Suraj Kumar On 21 November 2019:08:40:29 AM
Question 590. Asked on :09 November 2019:06:43:47 PM
-Added by Akki chauhan Science » Periodic Classification Of Elements
Answer:
-Answered by Rohit Rajput On 10 November 2019:06:06:48 PM
Question 591. Asked on :08 November 2019:03:38:28 PM
What product the chest cavity?
-Added by Suman Kumari Science » Science
Answer:
-Answered by priyanshu kumar On 10 November 2019:03:07:34 PM
Question 592. Asked on :08 November 2019:03:37:23 PM
What is Diaphagm?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Akki chauhan On 09 November 2019:06:26:04 PM
Question 593. Asked on :08 November 2019:03:35:50 PM
Where lungs are situated?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Akki chauhan On 09 November 2019:06:26:14 PM
Question 594. Asked on :08 November 2019:03:35:01 PM
What is nasal cavity?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Akki chauhan On 09 November 2019:06:26:27 PM
Question 595. Asked on :08 November 2019:03:30:09 PM
write the difference between anaerobic and aerobic respiration?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Akki chauhan On 09 November 2019:06:26:38 PM
Question 596. Asked on :08 November 2019:03:27:55 PM
Which acid is present in ant bite?
-Added by Suman Kumari Science » Science
Answer:
-Answered by priyanshu kumar On 10 November 2019:03:08:19 PM
Question 597. Asked on :08 November 2019:03:25:09 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by priyanshu kumar On 10 November 2019:03:08:44 PM
Question 598. Asked on :08 November 2019:03:24:50 PM
What is the effect of DNA copying, which is not perfectly accurate, on the reproduction process?
-Added by Nishant Verma Science » Gk
Answer:
The DNA copying which is not perfectly accurate in the reproduction process results in variations in
-Answered by Suraj Kumar On 09 November 2019:08:45:35 AM
Question 599. Asked on :08 November 2019:03:24:38 PM
-Added by Nishant Verma Science » Gk
Answer:
The flow of energy in the ecosystem is said to be unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis.
-Answered by Suraj Kumar On 09 November 2019:08:45:45 AM
Question 600. Asked on :08 November 2019:03:23:04 PM
Define oscillation?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Suraj Kumar On 09 November 2019:08:46:00 AM
Question 601. Asked on :08 November 2019:03:24:02 PM
A concave mirror of focal length 15 cm can form a magnified, erect as well as inverted image of an object placed in front of it." Justify this statement stating the position of the object with respect to the pole of the mirror in both the cases for obtaining the images.
-Added by Nishant Verma Science » Gk
Answer:
For magnified and erect image the object is placed between pole P and focus F. For magnified and inverted image the object is placed either at focus or anywhere between F and C.
-Answered by Suraj Kumar On 09 November 2019:08:46:24 AM
Question 602. Asked on :08 November 2019:03:23:46 PM
What kind of combustion is observed in alkanes? Why do air holes of a gas burner have to be adjusted when vessel being heated gets blackened by the flame?
-Added by Nishant Verma Science » Gk
Answer:
Alkanes are saturated hydrocarbons and generally burn in air with a blue, non-sooty flame.
If the bottoms of the cooking vessels in our homes are getting blackened, it shows that the air holes of the gas stove are getting blocked and the fuel is not burning completely.
-Answered by Rohit Rajput On 10 November 2019:06:10:10 PM
Question 603. Asked on :08 November 2019:03:23:35 PM
-Added by Nishant Verma Science » Gk
Answer:
The first occurrence of menstruation at the age of 12 in females is called menarche. Menarche is the beginning of the reproductive life of a girl. Menstruation stops when a woman reaches the age of 50 approx. At this age she loses her ability to bear child in her womb, i.e., she becomes infertile. This stage of permanent stoppage of menstruation is called the menopause. Thus, reproductive life of a woman starts at menarche and ends at menopause.
-Answered by Suraj Kumar On 09 November 2019:08:46:47 AM
Question 604. Asked on :08 November 2019:03:23:24 PM
-Added by Nishant Verma Science » Gk
Answer:
The general formula for the homologous series of functional group −OH is CnH2n+1OH.
The two consecutive members of this series are:
a. CH3OH(Methanol)
b. CH3CH2OH (Ethanol)
where n is 1 and 2 respectively
The molecular formula for both of them are CH4O and C2H6O.
-Answered by Suraj Kumar On 09 November 2019:08:46:59 AM
Question 605. Asked on :08 November 2019:03:23:10 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Suraj Kumar On 09 November 2019:08:47:18 AM
Question 606. Asked on :08 November 2019:03:22:55 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Suraj Kumar On 09 November 2019:08:47:27 AM
Question 607. Asked on :08 November 2019:03:22:43 PM
-Added by Nishant Verma Science » Current Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:07:10:02 PM
Question 608. Asked on :08 November 2019:03:22:27 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:07:10:10 PM
Question 609. Asked on :08 November 2019:03:21:08 PM
Explain why a ray of light passing through the centre of curvature of concave minor gets reflected along the same path.
-Added by Nishant Verma Science » Current Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:07:10:19 PM
Question 610. Asked on :08 November 2019:03:17:36 PM
What is rusting?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Suraj Kumar On 09 November 2019:08:48:15 AM
Question 611. Asked on :08 November 2019:03:16:32 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:07:10:38 PM
Question 612. Asked on :08 November 2019:03:16:20 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:07:10:47 PM
Question 613. Asked on :08 November 2019:03:16:04 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:07:10:57 PM
Question 614. Asked on :08 November 2019:03:15:54 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:07:11:08 PM
Question 615. Asked on :08 November 2019:03:15:26 PM
Sheikh Khalifa bin Zayed Al Nahyan was recently re-elected as the President of which country?
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:07:11:16 PM
Question 616. Asked on :08 November 2019:03:15:16 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:47:13 PM
Question 617. Asked on :08 November 2019:03:15:04 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:47:29 PM
Question 618. Asked on :08 November 2019:03:14:51 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:47:40 PM
Question 619. Asked on :08 November 2019:03:14:38 PM
-Added by Nishant Verma Science » Current Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:48:11 PM
Question 620. Asked on :08 November 2019:03:14:14 PM
Which nation has objected the inclusion of Kalapani in the new political map of India?
-Added by Nishant Verma Science » Gk
Answer:
11258
-Answered by Akki chauhan On 09 November 2019:06:48:31 PM
Question 621. Asked on :08 November 2019:03:13:50 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:48:46 PM
Question 622. Asked on :08 November 2019:03:12:23 PM
Which two state assemblies came together for a special assembly session on November 6?
-Added by Nishant Verma Science » Current Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:48:54 PM
Question 623. Asked on :08 November 2019:02:55:45 PM
-Added by Nishant Verma Science » Gk
Answer:
The basis for grouping organisms into five kingdoms depends on their:
(a) Cell structure.
(b) Mode and source of nutrition.
(c) Body organisation
-Answered by Akki chauhan On 09 November 2019:06:49:01 PM
Question 624. Asked on :08 November 2019:02:55:33 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:49:10 PM
Question 625. Asked on :08 November 2019:02:55:22 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:49:25 PM
Question 626. Asked on :08 November 2019:02:55:08 PM
-Added by Nishant Verma Science » Gk
Answer:
Sound intensity is the amount of energy carried by sound whereas loudness is a measurement of the audible sound.
-Answered by Nishant Verma On 08 November 2019:02:57:40 PM
Question 627. Asked on :08 November 2019:02:54:55 PM
-Added by Nishant Verma Science » Gk
Answer:
It blocks the bacterial synthesis pathway without affecting our own. It blocks the bacterial processes that build the cell wall. As a result, the disease causing bacteria become unable to make cell-walls, and die easily.
-Answered by Nishant Verma On 08 November 2019:02:57:56 PM
Question 628. Asked on :08 November 2019:02:54:39 PM
State any two conditions essential for good health.
-Added by Nishant Verma Science » G.k
Answer:
-Answered by Akki chauhan On 09 November 2019:06:39:36 PM
Question 629. Asked on :08 November 2019:02:54:29 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:39:46 PM
Question 630. Asked on :08 November 2019:02:54:10 PM
-Added by Nishant Verma Science » Gk
Answer:
(i) Kill the cause of disease.
(ii) Reduce the effects of the disease.
-Answered by Akki chauhan On 09 November 2019:06:39:58 PM
Question 631. Asked on :08 November 2019:02:53:54 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:40:05 PM
Question 632. Asked on :08 November 2019:02:53:41 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:40:12 PM
Question 633. Asked on :08 November 2019:02:53:10 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:40:35 PM
Question 634. Asked on :08 November 2019:02:52:17 PM
(b) Where are electrons found in the atom?
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Akki chauhan On 09 November 2019:06:43:14 PM
Question 635. Asked on :08 November 2019:02:51:59 PM
-Added by Nishant Verma Science » Gk
Answer:
-Answered by Nishant Verma On 08 November 2019:03:02:56 PM
Question 636. Asked on :08 November 2019:02:51:45 PM
What are intermolecular forces? How are these related to the three states of matter?
-Added by Nishant Verma Science » Current Gk
Answer:
In liquid, intermolecular force is weak to give definite shape.
In gas, intermolecular force is negligible and so its constituent particles are free to move and occupy the available space.
-Answered by Nishant Verma On 08 November 2019:03:03:11 PM
Question 637. Asked on :08 November 2019:02:50:26 PM
-Added by Nishant Verma Science » Current Gk
Answer:
Warm-blooded animals have a relatively higher blood temperature and can maintain the constant internal body temperature through metabolic processes. Mammals and birds are warm-blooded animals.
-Answered by Nishant Verma On 08 November 2019:03:04:53 PM
Question 638. Asked on :08 November 2019:02:50:13 PM
State the utility of tissues in multi-cellular organism.
-Added by Nishant Verma Science » Gk
Answer:
We see division of labour in multi-cellular organism as a particular function is carried out by a cluster of cells (tissue) at a definite place in the body. The tissues are arranged and designed in such a way that they give the highest possible efficiency of function.
-Answered by Nishant Verma On 08 November 2019:03:05:07 PM
Question 639. Asked on :06 November 2019:03:26:00 PM
National Research Institute of Unani Medicine has been inaugurated in which state?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Nishant Verma On 07 November 2019:02:57:40 PM
Question 640. Asked on :06 November 2019:03:20:18 PM
What is aerobic respiration?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Nishant Verma On 07 November 2019:02:57:50 PM
Question 641. Asked on :06 November 2019:03:17:41 PM
What is the Anaerobic respiration?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Akki chauhan On 07 November 2019:10:06:34 AM
Question 642. Asked on :06 November 2019:03:13:58 PM
What is cellular respiration?
-Added by Suman Kumari Science » Science
Answer:
Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate, and then release waste products.
-Answered by Nishant Verma On 07 November 2019:02:58:10 PM
Question 643. Asked on :31 October 2019:08:00:27 PM
What is the Tyndall effect?
-Added by Himanshi Verma Science » Light
Answer:
When light passes through a colloid its path become visible is called tyndall effect.
-Answered by priyanshu kumar On 01 November 2019:10:01:52 AM
Question 644. Asked on :31 October 2019:07:54:14 PM
What is referred as white light?
-Added by Himanshi Verma Science » Light
Answer:
Any light that forms a spectrum similar to that of sunlight is referred as white light.
-Answered by priyanshu kumar On 01 November 2019:10:02:05 AM
Question 645. Asked on :31 October 2019:07:50:03 PM
Why spectrum is formed when light is passed through a glass prism?
-Added by Himanshi Verma Science » Light
Answer:
Each colour has a definite wavelength the angle of deviation differs. Red is the least deviated and violet is the most deviated colour so different clours deviate at different angles to form spectrum.
-Answered by Suraj Kumar On 01 November 2019:10:58:24 AM
Question 646. Asked on :31 October 2019:07:45:40 PM
What is Acronym?
-Added by Himanshi Verma Science » Light
Answer:
It is a group of alphabets that represent sequential colours in spectrum.
-Answered by priyanshu kumar On 01 November 2019:10:02:33 AM
Question 647. Asked on :31 October 2019:07:43:44 PM
What is Spectrum?
-Added by Himanshi Verma Science » Light
Answer:
The band of seven colours formed due to dispersion of light is called spectrum.
-Answered by Suraj Kumar On 01 November 2019:10:58:50 AM
Question 648. Asked on :31 October 2019:07:39:35 PM
What are the advantages of the eyes in front of the face?
-Added by Himanshi Verma Science » Light
Answer:
1. It gives a wider field of view.
2. It enhances the ability to detect faint objects.
3. It provides three dimensional view.
-Answered by priyanshu kumar On 01 November 2019:10:03:04 AM
Question 649. Asked on :31 October 2019:07:24:40 PM
Write the causes presbyopia?
-Added by Himanshi Verma Science » Light And Reflection
Answer:
1. Gradual weakening of ciliary muscle.
2. Diminishing flexibility of eye lens.
-Answered by Rohit Rajput On 01 November 2019:09:16:51 AM
Question 650. Asked on :31 October 2019:07:15:23 PM
Write the causes of Myopia?
-Added by Himanshi Verma Science » Light
Answer:
1. Gradual weakening of ciliary muscle.
2. Diminishing flexibility of eye lens.
-Answered by Suraj Kumar On 01 November 2019:10:59:12 AM
Question 651. Asked on :31 October 2019:07:10:40 PM
What are the causes of Hypermetropia?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
1. Focal length of the eye lens becomes too long.
2. Eye balls becomes too small.
-Answered by Rohit Rajput On 01 November 2019:09:17:45 AM
Question 652. Asked on :31 October 2019:06:57:27 PM
Write two laws of reflection?
-Added by Himanshi Verma Science » Light Reflection And Refraction
Answer:
2.The incident ray , the reflected ray and the normal to the mirror all line in the similar plane.
-Answered by priyanshu kumar On 01 November 2019:10:04:47 AM
Question 653. Asked on :29 October 2019:03:16:06 PM
The number of chromosomes present in a normal human being is?
-Added by Suman Kumari Science » Science
Answer:
-Answered by priyanshu kumar On 01 November 2019:10:29:17 AM
Question 654. Asked on :29 October 2019:03:14:08 PM
The locomotory organ of Amoeba is?
-Added by Suman Kumari Science » Science
Answer:
Pseudopodia.
-Answered by priyanshu kumar On 01 November 2019:10:29:59 AM
Question 655. Asked on :29 October 2019:03:10:50 PM
The disease that is caused by the virus is ?
-Added by Suman Kumari Science » Science
Answer:
Common cold.
-Answered by priyanshu kumar On 01 November 2019:10:30:11 AM
Question 656. Asked on :29 October 2019:03:09:48 PM
Which one of the following is not a vaccine?
-Added by Suman Kumari Science » Science
Answer:
Progesterone.
-Answered by priyanshu kumar On 01 November 2019:10:30:24 AM
Question 657. Asked on :29 October 2019:03:04:13 PM
The vitamin most readily destroyed by heat is ?
-Added by Suman Kumari Science » Science
Answer:
Ascorbic acid.
-Answered by priyanshu kumar On 01 November 2019:10:30:34 AM
Question 658. Asked on :28 October 2019:03:34:16 PM
-Added by Suman Kumari Science » Science Questions
Answer:
46.
-Answered by priyanshu kumar On 01 November 2019:10:30:44 AM
Question 659. Asked on :28 October 2019:03:24:32 PM
Cemet is madehard by?
-Added by Nitu 123 Pawer Science » Science
Answer:
-Answered by priyanshu kumar On 01 November 2019:10:31:03 AM
Question 660. Asked on :28 October 2019:03:20:20 PM
-Added by Nitu 123 Pawer Science » Physics
Answer:
Neutron star.
-Answered by priyanshu kumar On 01 November 2019:10:31:17 AM
Question 661. Asked on :28 October 2019:03:15:22 PM
Which among the following waves is used for communication by artificial satellite?
-Added by Nitu 123 Pawer Science » Physics
Answer:
Microwaves .
-Answered by Rohit Rajput On 01 November 2019:09:35:13 AM
Question 662. Asked on :28 October 2019:03:13:24 PM
What is the full form of SDMC?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Rohit Rajput On 01 November 2019:09:35:31 AM
Question 663. Asked on :27 October 2019:09:13:50 PM
What is clayey soil?
-Added by Suman Kumari Science » Science
Answer:
The portion of fine particles is relatively higher, then it is called clayey soil.
-Answered by priyanshu kumar On 01 November 2019:10:32:28 AM
Question 664. Asked on :26 October 2019:05:44:09 PM
What is metal?
-Added by Suman Kumari Science » Science
Answer:
-Answered by priyanshu kumar On 01 November 2019:10:32:38 AM
Question 665. Asked on :26 October 2019:05:36:29 PM
Write three physical properties of metal?
-Added by Suman Kumari Science » Science
Answer:
(ii)Good conductor of heat and electricity
(iii)High melting points.
-Answered by priyanshu kumar On 01 November 2019:10:33:03 AM
Question 666. Asked on :26 October 2019:04:45:37 PM
What is the reaction of acid?
-Added by Nitu 123 Pawer Science » Acid Base Salt
Answer:
-Answered by Nishant Verma On 01 November 2019:03:27:28 PM
Question 667. Asked on :25 October 2019:03:18:51 PM
What acid is present in ant bite?
-Added by Suman Kumari Science » Science Questions
Answer:
-Answered by Nishant Verma On 26 October 2019:03:16:46 PM
Question 668. Asked on :25 October 2019:03:14:37 PM
What is neutralisation?
-Added by Suman Kumari Science » Science
Answer:
-Answered by Nishant Verma On 26 October 2019:03:16:57 PM
Question 669. Asked on :24 October 2019:05:18:54 PM
Describe any three steps that can be taken to solve the problem of land degradation?
-Added by Himanshi Verma Science » Resources And Development
Answer:
Three steps that can be taken to solve the problem of land degradation:
1. Afforestation and proper management of grazing.
2. Planting of shelter belts of plants and control on over grazing.
3. Proper management of waste lands and control of mining activities.
-Answered by priyanshu kumar On 25 October 2019:09:07:55 AM
Question 670. Asked on :23 October 2019:03:00:37 PM
What is neutral solution?
-Added by Suman Kumari Science » Science
Answer:
-Answered by priyanshu kumar On 24 October 2019:09:43:27 AM
Question 671. Asked on :22 October 2019:05:35:51 PM
Why does clear sky look blue?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
The sky appears blue because the tiny particles held in the atmosphere scatter lights of shorter wavelength like blue light. This light is received by our eye and the sky appears blue. in the absence of atmosphere, scattering does not take place and the sky appears dark.
-Answered by Rohit Rajput On 23 October 2019:10:31:49 AM
Question 672. Asked on :22 October 2019:05:31:21 PM
What is scattering of light?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
The re- scattering of light by the scatters present is the atmosphere in different directions after being absorbed by them is called scattering.
-Answered by Rohit Rajput On 23 October 2019:10:32:00 AM
Question 673. Asked on :22 October 2019:05:28:05 PM
What are the two causes of this defect of vision?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
The two possible causes of this defect are;-
1. Increases is the focal length of the eye lens.
2. Eye ball gets shortened.
-Answered by priyanshu kumar On 23 October 2019:10:16:11 AM
Question 674. Asked on :22 October 2019:05:25:10 PM
What is hypermetropia?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
Hypermetropia is the detect in which a person can see distant objects clearly but cannot see the nearby objects.
-Answered by Rohit Rajput On 23 October 2019:10:32:25 AM
Question 675. Asked on :22 October 2019:05:22:25 PM
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
Range of vision of a normal human eye is between it's near point and far point is, from 25cm to infinity.
-Answered by Rohit Rajput On 23 October 2019:10:32:39 AM
Question 676. Asked on :22 October 2019:05:18:53 PM
What is the basic cause of atmospheric refraction?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
The basic cause of atmospheric refraction is variation in optical density of different layers of earth's atmosphere. The sun passes through earth's atmosphere.
-Answered by Rohit Rajput On 23 October 2019:10:32:55 AM
Question 677. Asked on :22 October 2019:05:13:52 PM
Why does sky appear dark instead of blue to an astronaut?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
Sky appears dark instead of blue to an astronauts because there is no atmosphere in the outer space that can scatter the sunlight. As the sunlight not scattered, no scattered light reach the eyes of the astronauts and the sky appears and black to them.
-Answered by priyanshu kumar On 23 October 2019:10:17:19 AM
Question 678. Asked on :22 October 2019:05:08:45 PM
Can visible light scattered by atoms/ molecules in earth's atmosphere?
-Added by Himanshi Verma Science » The Human Eye And The Colourful World
Answer:
Yes, as size of molecules/ atoms is much less then wavelength of light.
-Answered by Rohit Rajput On 23 October 2019:10:33:17 AM
Question 679. Asked on :18 October 2019:11:04:14 PM
What is hemoglobin?
-Added by Suman Kumari Science » Science
Answer:
-Answered by priyanshu kumar On 20 October 2019:09:07:38 AM
Question 680. Asked on :18 October 2019:03:16:44 PM
-Added by Suman Kumari Science » Science Questions
Answer:
-Answered by priyanshu kumar On 20 October 2019:09:12:48 AM
Question 681. Asked on :18 October 2019:03:12:39 PM
What is fabric?
-Added by Suman Kumari Science » Science
Answer:
Sources and types. Textiles are made from many materials, with four main sources: animal (wool, silk), plant (cotton, flax, jute, bamboo), mineral (asbestos, glass fibre), and synthetic (nylon, polyester, acrylic, rayon). The first three are natural.
-Answered by priyanshu kumar On 20 October 2019:09:13:11 AM
Question 682. Asked on :16 October 2019:08:05:42 PM
-Added by Himanshi Verma Science » Acid Base And Salt
Answer:
pH will decrease as it turns to curd because curd is acidic due to the presence of lactic acid.
-Answered by priyanshu kumar On 17 October 2019:08:34:43 AM
Question 683. Asked on :16 October 2019:08:04:40 PM
Mention the pH range within which our body works. Explain how antacids
give relief from acidity. Write the name of one such antacid.-Added by Himanshi Verma Science » Acid Base Salt
Answer:
Our stomach has pH equal to 2. Antacids neutralize the excess of acid in our body and gives relief from hyperacidity. Sodium hydrogencarbonate is one of such antacid.
-Answered by priyanshu kumar On 17 October 2019:08:34:53 AM
Question 684. Asked on :16 October 2019:08:03:20 PM
What are ‘magnetic field lines’? How is the direction of a magnetic field at a point determined ?
-Added by Himanshi Verma Science » Magnetic Fields Of Electric Current
Answer:
The magnetic field lines are the pictorial representation of the strength and direction of the magnetic field.
The direction of the magnetic field at a point can be found by placing a small magnetic compass at that point. The north end of the needle of a compass indicates the direction of magnetic field at a point where it is placed.
-Answered by Nishant Verma On 17 October 2019:02:31:40 PM
Question 685. Asked on :16 October 2019:08:02:06 PM
Why convex mirror is used in rear view mirrors and not concave mirror?
-Added by Himanshi Verma Science » Light Reflection And Refraction
Answer:
Convex mirror is commonly used in rear view mirrors in vehicles because it gives an erect, virtual, full size diminished image of distant objects with a wider field of view. Thus, convex mirrors enable the driver to view much larger area which is not possible with a concave mirror.
-Answered by priyanshu kumar On 17 October 2019:08:35:20 AM
Question 686. Asked on :16 October 2019:07:59:32 PM
Why magnification is taken negative for real images and positive for virtual images?
-Added by Himanshi Verma Science » Light Reflection And Refraction
Answer:
If image is real, it will be inverted which means height of image will be taken as negative. Also, the height of object is always positive.
Now as magnification = Height of image / Height
Therefore, in case of real image,
Magnification = Height of image (-) / height of object (+)=Negative.
So, Magnification will be negative.
Similarly, if image is virtual, it will be erect.
Therefore, in case of virtual image,
Magnification = Height of image (+) / height of object (+)= Positive
So, Magnification will be positive. of object.
-Answered by Nishant Verma On 17 October 2019:02:32:30 PM
Question 687. Asked on :16 October 2019:07:58:12 PM
How are we able to see distant and nearby objects clearly? Which part of eye helps in changing curvature of lens? Why no image is formed at blind spot?
-Added by Himanshi Verma Science » Light Reflection And Refraction
Answer:
We can see distant and near objects clearly because of the property of accommodation of eye. Accommodation is the name given to the ability of the lens of the eye to change its focal length and produce focused images of both distant and near objects on the retina. Ciliary muscle helps in changing curvature of the lens. They are attached to the lens and contract or release to change the lens shape and curvature.No image is formed at blind spot because there are no photoreceptors, i.e., cones and rods to detect the light and send it to brain.
-Answered by priyanshu kumar On 17 October 2019:08:35:47 AM
Question 688. Asked on :16 October 2019:07:57:00 PM
Dark reaction of photosynthesis does not need light. Do plants undergo dark reaction at night? Explain.
-Added by Himanshi Verma Science » Life Processes
Answer:
Dark reaction does not mean that it occurs in the absence of light i.e., at night. Infact, it is the reaction occurring simultaneously with light reaction. It a chemical process occurring independent of light. This reaction is completely based on enzymes.
-Answered by priyanshu kumar On 17 October 2019:08:36:01 AM
Question 689. Asked on :16 October 2019:07:55:49 PM
What is the important function of presence of ozone in earth’s atmosphere?
-Added by Himanshi Verma Science » Our Environment
Answer:
Ozone is the Earth’s natural process for all life forms. It shields our planet from the UV radiations, as these ultraviolet rays are harmful for all the living things. Therefore, any change in the size of this layer will automatically affect the life of people, plants and animals living on earth.
-Answered by priyanshu kumar On 17 October 2019:08:36:11 AM
Question 690. Asked on :16 October 2019:07:54:35 PM
Explain why a ray of light passing through the centre of curvature of concave minor gets reflected along the same path.
-Added by Himanshi Verma Science » Light Reflection And Refraction
Answer:
The light falling on the centre of curvature is reflected back along the same path because the incident ray falls on the mirror along the normal to the reflecting surface.
-Answered by priyanshu kumar On 17 October 2019:08:36:24 AM
Question 691. Asked on :16 October 2019:07:51:14 PM
Explain AC generator with the help of diagram.
-Added by Himanshi Verma Science » Electricity
Answer:
AC generator is a device which converts mechanical energy into alternating form of electrical energy. It works on the principle of electromagnetic induction. When a closed coil is rotated in a uniform magnetic field with its axis perpendicular to the magnetic field, the magnetic field lines passing through the coil change and an induced emf is produced causing the flow of current in it.
-Answered by priyanshu kumar On 17 October 2019:08:36:48 AM
Question 692. Asked on :16 October 2019:07:45:17 PM
What is Ohm's Law? and verify ohm's law.
-Added by Himanshi Verma Science » Electricity
Answer:
Ohm's law states that under constant temperature, the current passing through conductor is directly proportional to potential difference applied across it.
i.e., V = IR
Where, V = potential difference R = Resistance (constant) I = Current
Ohm's law can be verified using following circuit diagram,
-Answered by priyanshu kumar On 17 October 2019:08:37:00 AM
Question 693. Asked on :12 October 2019:12:22:29 PM
In which part of the body digestion of protein starts?
-Added by Himanshi Verma Science » G.k
Answer:
Stomach
-Answered by Rohit Rajput On 24 October 2019:09:55:18 AM
Question 694. Asked on :12 October 2019:12:21:56 PM
Name the corona virus that kills human?
-Added by Himanshi Verma Science » G.k
Answer:
SARS
-Answered by priyanshu kumar On 12 October 2019:03:08:48 PM
Question 695. Asked on :12 October 2019:12:21:18 PM
Mention the source of Liver, milk, egg yolk, fish liver oil?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by Rohit Rajput On 24 October 2019:09:55:35 AM
Question 696. Asked on :12 October 2019:12:19:56 PM
-Added by Himanshi Verma Science » G.k
Answer:
Plam of hand
-Answered by Rohit Rajput On 24 October 2019:09:55:48 AM
Question 697. Asked on :12 October 2019:12:19:18 PM
Which organ of the body produces the fluid known as bile?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by Rohit Rajput On 24 October 2019:09:55:57 AM
Question 698. Asked on :12 October 2019:12:18:50 PM
Which blood vessels have the smallest diameter?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by Rohit Rajput On 24 October 2019:09:56:14 AM
Question 699. Asked on :12 October 2019:12:17:22 PM
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:03:12:03 PM
Question 700. Asked on :12 October 2019:11:23:40 AM
-Added by Himanshi Verma Science » Control And Coordination
Answer:
-Answered by Master Purushottam On 13 October 2019:02:26:07 PM
Question 701. Asked on :12 October 2019:11:21:19 AM
-Added by Himanshi Verma Science » G.k
Answer:
man becomes unconscious due to a head injury. A pin is pricked on his foot he withdraws his foot. However, I would like to add one more point that Reflex actions are mainly controlled by spinal cord, so that is why, the person is able to move his/her foot even after suffering head or brain injuries.
-Answered by Master Purushottam On 13 October 2019:02:26:27 PM
Question 702. Asked on :12 October 2019:11:09:50 AM
A man becomes unconscious due to head injury. A pin is pricked on his foot, he withdraws his foot. Why? Explain.
-Added by Himanshi Verma Science » Control And Coordination
Answer:
man becomes unconscious due to a head injury. A pin is pricked on his foot he withdraws his foot. However, I would like to add one more point that Reflex actions are mainly controlled by spinal cord, so that is why, the person is able to move his/her foot even after suffering head or brain injuries.
-Answered by Master Purushottam On 13 October 2019:02:26:50 PM
Question 703. Asked on :12 October 2019:10:55:31 AM
What are hormones? List four characteristics of hormones.
-Added by Himanshi Verma Science » Control And Coordination
Answer:
Hormones are chemical substances which are secreted in very less amount by specialized tissues called endocrine glands.
Characteristics of hormones are:-
1. They are required in very less amount.
2. Hormones are specific in their function.
3. They act away from the site of production.
4. Deficiency or over secretions of hormones have negative effects in the body.
-Answered by priyanshu kumar On 12 October 2019:03:16:21 PM
Question 704. Asked on :12 October 2019:10:50:56 AM
Why decomposition reaction are called opposite of combination reaction?
-Added by Himanshi Verma Science » Chemical Reaction And Equation
Answer:
In a decomposition reaction, a single substance breaks down into two or more substance while in a combination reaction, two or more substances react to produce one substance. Therefore, decomposition reaction are called opposite of combination reaction.
-Answered by Nishant Verma On 13 October 2019:03:25:26 PM
Question 705. Asked on :10 October 2019:07:59:38 PM
Which heavy metal causes Itai Itai disease?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:03:57:50 PM
Question 706. Asked on :10 October 2019:07:58:46 PM
Accumulation of which chemical leads to kidney stones?
-Added by Himanshi Verma Science » G.k
Answer:
Calcium oxide
-Answered by Rohit Rajput On 24 October 2019:09:57:55 AM
Question 707. Asked on :10 October 2019:07:58:16 PM
-Added by Himanshi Verma Science » G.k
Answer:
MERCURY
-Answered by Rohit Rajput On 24 October 2019:09:58:07 AM
Question 708. Asked on :10 October 2019:07:56:40 PM
What is uses of convex mirror?
-Added by Himanshi Verma Science » Light Reflection And Refraction
Answer:
Convex mirror are preferred because they always give an erect thought outwards thus convex mirror enable the drive to view much largest area than would be possible with a plane mirror.
-Answered by Rohit Rajput On 24 October 2019:09:58:18 AM
Question 709. Asked on :10 October 2019:07:57:40 PM
Which element is excreted through human sweat?
-Added by Himanshi Verma Science » G.K.
Answer:
-Answered by Rohit Rajput On 24 October 2019:09:58:33 AM
Question 710. Asked on :10 October 2019:07:56:54 PM
What is the other name of thiamine?
-Added by Himanshi Verma Science » G.k
Answer:
Vitamin B1
-Answered by Rohit Rajput On 24 October 2019:09:58:40 AM
Question 711. Asked on :10 October 2019:07:55:48 PM
Which Vitamin is also known as retinol?
-Added by Himanshi Verma Science » G.k
Answer:
Vitamin A
-Answered by Rohit Rajput On 24 October 2019:09:59:01 AM
Question 712. Asked on :10 October 2019:07:54:55 PM
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:03:59:23 PM
Question 713. Asked on :10 October 2019:07:54:05 PM
What is the biological polymer in paper?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:03:59:45 PM
Question 714. Asked on :10 October 2019:07:50:06 PM
What is characterstics plane mirror?
-Added by Aarohi Chauhan Science » LIGHT
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:00:04 PM
Question 715. Asked on :10 October 2019:07:52:22 PM
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:00:12 PM
Question 716. Asked on :10 October 2019:07:51:06 PM
Why sugar is called white sugar?
-Added by Himanshi Verma Science » G.k
Answer:
Sugar is known as the "White Poison". As indicated by a review directed in the US by a few specialists, it is discovered that sugar is seven times more addictive than cocaine.It is discovered that a rough of over half of individuals in the U. S. have an extreme sugar dependence. Sugar commandeers your cerebrum. These addicts have a solid longing for sugar and starches.
-Answered by Rohit Rajput On 11 October 2019:08:10:52 PM
Question 717. Asked on :10 October 2019:07:49:53 PM
Which is called white poison?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:01:08 PM
Question 718. Asked on :10 October 2019:07:49:02 PM
What is the chemical name of Chinese salt?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:01:15 PM
Question 719. Asked on :10 October 2019:07:48:34 PM
Which chemical is called Chile Salt peter?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:01:33 PM
Question 720. Asked on :10 October 2019:07:48:10 PM
Which chemical is the reason behind the brown colour of human faces?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:03:00 PM
Question 721. Asked on :10 October 2019:07:45:55 PM
Diffrence between concave mirror and convex mirror?
-Added by Aarohi Chauhan Science » Light Reflection And Refraction
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:03:11 PM
Question 722. Asked on :10 October 2019:07:47:23 PM
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by Akki chauhan On 11 October 2019:10:39:33 AM
Question 723. Asked on :10 October 2019:07:46:32 PM
-Added by Himanshi Verma Science » Materials ,metal And Non-metal
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:03:30 PM
Question 724. Asked on :10 October 2019:07:45:37 PM
What is the name given to plastics that cannot be recycled?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:04:45 PM
Question 725. Asked on :10 October 2019:07:42:26 PM
How many types of mirror?
-Added by Aarohi Chauhan Science » Light Reflection And Refraction
Answer:
1. concave
2. convex
-Answered by Akki chauhan On 11 October 2019:10:40:44 AM
Question 726. Asked on :10 October 2019:07:43:48 PM
With which polymer, the cabinets of radio and TV made of?
-Added by Himanshi Verma Science » G.k
Answer:
Polystyrene
-Answered by Rohit Rajput On 24 October 2019:10:01:27 AM
Question 727. Asked on :10 October 2019:07:43:03 PM
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:05:26 PM
Question 728. Asked on :10 October 2019:07:42:19 PM
Which metal is used in the making of microchips?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:05:35 PM
Question 729. Asked on :10 October 2019:07:41:37 PM
Which toxic element present in automobile exhausts?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by Rohit Rajput On 24 October 2019:10:02:03 AM
Question 730. Asked on :10 October 2019:07:40:54 PM
Which gas evolved from paddy fields and marshes?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by Rohit Rajput On 24 October 2019:10:02:27 AM
Question 731. Asked on :10 October 2019:07:40:09 PM
Which is the most abundant gas in the earth's atmosphere?
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by Rohit Rajput On 24 October 2019:10:03:00 AM
Question 732. Asked on :10 October 2019:07:39:07 PM
Who invented periodic table?
-Added by Himanshi Verma Science » G.k
Answer:
Dmitri Mendeleev
-Answered by Akki chauhan On 11 October 2019:10:43:49 AM
Question 733. Asked on :10 October 2019:07:37:03 PM
-Added by Himanshi Verma Science » G.k
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:06:48 PM
Question 734. Asked on :10 October 2019:07:35:19 PM
Which hormone is called steroid and why?
-Added by Himanshi Verma Science » Control And Coordination
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:07:13 PM
Question 735. Asked on :10 October 2019:07:34:05 PM
Which organ of the body produces the fluid known as bile?
-Added by Himanshi Verma Science » Life Process
Answer:
-Answered by priyanshu kumar On 12 October 2019:04:07:22 PM
Question 736. Asked on :10 October 2019:07:31:40 PM
What is low of reflection?
-Added by Aarohi Chauhan Science » Light Reflection And Refraction
Answer:
2. the incidence ray normal to the the mirror at the point of incidence and the reflected ray ,all lie in the same plane.
-Answered by priyanshu kumar On 12 October 2019:04:07:42 PM
Question 737. Asked on :10 October 2019:07:33:11 PM
A yellow dust appears on the fingers, whenever we touch the middle of a flower. These tiny yellow grains are one of the most precious substances in nature because they contain the secret of plant life. What is this dust called?
-Added by Himanshi Verma Science » G.k
Answer: