Asked/Added Questions From NCERT: Science


Question 1. Asked on :19 March 2019:05:39:31 PM

 What is LASER? and what is its full form?

-Added by Saraswati Kumari Science » Physics

Answer:

Payal Kumari

 It is a device that produces an intense, coherent and highly directional beam of the single frequency. It can be transmitted over a great distance without being spread. 

The full form of LASER  is Light Amplification by Stimulated Emission of Radiation.

-Answered by Payal Kumari On 19 March 2019:05:44:55 PM


Question 2. Asked on :19 March 2019:05:29:52 PM

Why Atmospheric pressure decreases with altitude?

-Added by Payal Kumari Science » Atmosphere

Answer:

Himanshi Verma

Atmospheric Pressure decreases with altitude that is why:-

1) It is difficult to cook on the motion. 

2) The fountain pen of a passenger leaks in aeroplane. 

3) Bleeding occurs from the nose.

4) It is difficult to breath on higher altitude due to less amount partial pressure of oxygen in air.

5) Water starts to boil below 100°C .

° 

-Answered by Himanshi Verma On 19 March 2019:05:34:25 PM


Question 3. Asked on :17 March 2019:05:09:50 PM

 What was the code name of the first nuclear tests conducted by India in on 18 May 1974, in Pokhran, Rajasthan ?

-Added by Himanshi Verma Science » Gk

Answer:

Himanshi Verma


The day was May 18 in the year 1974. On this day, the Indian government conducted its first nuclear test in the deserts of PokhranRajasthan making it a peaceful nuclear explosion. 'Smiling Buddha' (MEA designation: Pokhran-I) was the assigned code name of India's first successful nuclear bomb test.

-Answered by Himanshi Verma On 19 March 2019:05:17:06 PM


Question 4. Asked on :09 March 2019:05:25:12 PM

 PH का दैनिक जीवन में क्या उपयोग है ? पांच बिन्दुएँ लिखकर समझाइए |

-Added by Payal kumari Science » G.k

Answer:

Himanshi Verma

 हमारे शरीर में होने वाली जैव रासायनिक क्रियाओं की पीएच परास 7 से लेकर 7.8 तक ही होती है। इसमें थोड़ा भी परिवर्तन हमारे शरीर पर बहुत घातक प्रभाव डालता है।


अम्लीय वर्षा में जल का ph मान 5.6 से कम होता है। इस जल के फल स्वरुप नदियों का PH मान भी कम हो जाता है जो कि जलीय जीवो पर हानिकारक प्रभाव डालता है।
उपजाऊ मिट्टी का पीएच मान भी एक निश्चित परास में होता है जो न तो अधिक अम्लीय तथा न ही अधिक क्षारीय होता है।
विभिन्न प्रकार के मसालेदार भोजन पेट की अम्लता को बढ़ाते हैं जिसकी वजह से एसिडिटी तथा गैस की समस्या होती है। इसे दूर करने के लिए क्षारीय प्रकृति वाले मिल्क ऑफ मैग्नीशिया का प्रयोग किया जाता है।
मधुमक्खी के डंक में मेथेनॉइक अम्ल होता है जोकि अम्लीय प्रकृति का होता है और जलन उत्पन्न करता है। इसे शांत करने के लिए क्षारीय प्रकृति के बेकिंग सोडा का प्रयोग किया जाता है।
दांत का इनामेल कैल्शियम सल्फेट का बना होता है जो कि हमारे शरीर का सबसे कठोर पदार्थ है। दांतों की सफाई नहीं करने पर बैक्टीरिया के सड़ने से अम्लों की उत्पत्ति होती है जिनसे मुंह की लार का पीएच 5.5 से कम चला जाता है और इनामेल को नुकसान पहुंचाता है।

-Answered by Himanshi Verma On 09 March 2019:05:27:06 PM


Question 5. Asked on :09 March 2019:04:48:01 PM

 Why the filament of bulb has melting point?

-Added by Payal kumari Science » Electricity

Answer:

Himanshi Verma

 filament is made up of a substance having high melting point(like tungsten) because A buld lights up by heating the filament. The heated filament is the source of light,and if the melting point of filament's substance is low,it may melt.

-Answered by Himanshi Verma On 09 March 2019:04:52:56 PM


Question 6. Asked on :09 March 2019:04:43:57 PM

 What is the benefit of residual volume of air in the respiratory process?

-Added by Himanshi Verma Science » Life Processes

Answer:

Payal kumari

 Residual volume is the amount of gas remaining in the lungs at the end of a maximal exhalation. Residual Volume is important because it prevents the lungsfrom collapsing. Even after we have expelled as much air as possible (expiratory reserve volume) gaseous exchange is still occurring by residual volume in thelungs.

-Answered by Payal kumari On 09 March 2019:04:46:24 PM


Question 7. Asked on :09 March 2019:01:52:58 PM

हीमोग्लोबिन की कमी से होने वाला रोग कौन सा है ?

-Added by Rohit rajput Science » G.k

Answer:

Himanshi Verma
हीमोग्लोबिन की कमी से अनेमिया रोग हो जाता है |

-Answered by Himanshi Verma On 10 March 2019:04:42:57 PM


Question 8. Asked on :09 March 2019:01:52:10 PM

 रेडक्रॉस के संस्थाक कौन है ?

-Added by Rohit rajput Science » G.k

Answer:

Himanshi Verma
Henry Dunant

-Answered by Himanshi Verma On 10 March 2019:04:43:59 PM


Question 9. Asked on :09 March 2019:01:50:49 PM

 चीन की मुद्रा का क्या नाम है ?

-Added by Bobby chauhan Science » G.k

Answer:

Himanshi Verma

  Yenam

-Answered by Himanshi Verma On 10 March 2019:04:41:24 PM


Question 10. Asked on :09 March 2019:01:49:00 PM

 घोघा रोग किसकी कमी से होता है ?

-Added by Bobby chauhan Science » G.k

Answer:

Himanshi Verma

 घेंघा (Goiter) एक रोग है जिसमे गला फूल जाता है। यह शरीर में आयोडीन  के की कमी के कारण होता है। आयोडीन की कमी के कारण थयेरिएद ग्रंथि  में सूजन आ जाती है। यह रोग बहुधा उन क्षेत्रों के लोगों को होता है जहाँ पानी में आयोडीन नहीं होता। आयोडीन की कमी की पूर्ति के लिये प्राय: आयोडीनयुक्त नमक  का उपयोग करने की सलाह दी जाती है।

-Answered by Himanshi Verma On 10 March 2019:04:45:23 PM


Question 11. Asked on :09 March 2019:01:48:06 PM

 भारत का सबसे बड़ा बांध कौन सा है ?

-Added by Bobby chauhan Science » G.k

Answer:

Himanshi Verma

 हीराकुंड बांध 

-Answered by Himanshi Verma On 10 March 2019:04:47:15 PM


Question 12. Asked on :09 March 2019:01:42:26 PM

 कौन सी ग्रंथि इन्सुलित स्रावित करती है ?

-Added by Bobby chauhan Science » G.k

Answer:

Himanshi Verma

 अग्नाश्ये 

-Answered by Himanshi Verma On 10 March 2019:04:47:33 PM


Question 13. Asked on :09 March 2019:01:12:46 PM

 Why should a magnesium ribbon be cleaned before burning in air?

-Added by Rohit rajput Science » Chemical Reaction

Answer:

Himanshi Verma
A magnesium ribbon should be cleaned before burning in air so that it may come in the contact of air.

-Answered by Himanshi Verma On 09 March 2019:01:26:04 PM


Question 14. Asked on :04 March 2019:02:52:07 PM

 Is milk is the example of Tyndall Effect. Why?


-Added by Himanshi Verma Science » CH 2

Answer:

Himanshi Verma

 This is because colloids have suspension of small particles, from 1 – 1000 nanometres in size which can scatter light falling on them, a phenomenon called asTyndall effect. In the above question, only b) milk and d) starch solution show Tyndall effect as they are colloids

-Answered by Himanshi Verma On 08 March 2019:05:18:28 PM


Question 15. Asked on :03 March 2019:01:53:36 PM

 अमेरिका मित्र राष्ट्र में कब शामिल हुआ ?

-Added by Himanshi Verma Science » History

Answer:

Himanshi Verma

 In 1917

-Answered by Himanshi Verma On 04 March 2019:02:50:47 PM


Question 16. Asked on :01 March 2019:03:37:26 PM

 Justify the statement that the elements having atomic number 3 and 11 will belong to the same group of periodic table.

-Added by Akki chauhan Science » Atom And Molecules

Answer:

Shalu Shukla

 Two elements are X  with atomic number 11 ---- Sodium

Y with atomic number 13--- Aluminium.


1. Which among-st  the two has less metallic character?

     

      Y has less metallic character because metallic character decreases in a period from left to right.


2. .Calculate the valency of each element.

Element X --- electronic configuration : 1s22s22p63s1

so valency is one.


Element Y electronic configuration : 1s22s22p63s23p3

Velency is three.


3 "Element ‘X’ is bigger than ‘Y’ in terms of atomic size. Is the statement true, justify? "

Its true . Because atomic size decreases over period due to increase in nuclear Charge.

-Answered by Shalu Shukla On 01 March 2019:03:46:36 PM


Question 17. Asked on :01 March 2019:03:36:17 PM

 We should not use polybags as they are non-biodegradable abd cause pollution. How can we replace them to become environment friendly.

-Added by Akki chauhan Science » Environment

Answer:

Himanshi Verma

 We can use it by making polybags recycle and either recycling it we can use paper polybags. If someone gives u something in plastic bags offer him not to do so.

-Answered by Himanshi Verma On 01 March 2019:03:43:16 PM


Question 18. Asked on :01 March 2019:03:14:21 PM

 कोशिका का बिजली घर किसे कहते  है ?

-Added by Akki chauhan Science » Fundamental Unit Of Life

Answer:

Himanshi Verma

 Mitochondria

-Answered by Himanshi Verma On 02 March 2019:07:29:26 AM


Question 19. Asked on :01 March 2019:03:13:17 PM

 Difference between Gymnosperm and Angoisperm?

-Added by Akki chauhan Science » Diversity In Living Organisms

Answer:

Himanshi Verma

 

Difference Between Angiosperm and Gymnosperm

Angiosperm

Gymnosperm

Seed is produced by flowering plants and is enclosed within ovarySeed is produced by non-flowering plants and are unenclosed or naked.
The lifecycle of these plants are seasonalThese plants are evergreen
Has triploid tissueHas haploid tissue
Leaves are flat in shapeLeaves are scalelike and needle-like in shape
Hardwood typeSoftwood type
Reproduction rely on animalsReproduction rely on wind
Reproductive system present in flowers (unisexual or bisexual)Reproductive system present in cones and are unisexual

-Answered by Himanshi Verma On 01 March 2019:03:44:00 PM


Question 20. Asked on :22 February 2019:02:09:09 PM

 Write the boiling point of distilled water

-Added by Himanshi Verma Science » Matter

Answer:

Jyoti Srivastva

 100 degre celcius

-Answered by Jyoti Srivastva On 01 March 2019:03:56:00 PM


Question 21. Asked on :19 February 2019:12:45:07 PM

 Write the full form of WHO?

-Added by Akki chauhan Science » Why Do We Fall Ill?

Answer:

Himanshi Verma

 World Health Organisation.

-Answered by Himanshi Verma On 24 February 2019:05:03:45 PM


Question 22. Asked on :19 February 2019:12:41:37 PM

Who discovered cell first ?

-Added by Akki chauhan Science » Atom And Molecules

Answer:

Himanshi Verma

 Robert Hook in 1665.

-Answered by Himanshi Verma On 24 February 2019:05:04:19 PM


Question 23. Asked on :16 February 2019:05:30:59 PM

 Which mammel lay eggs?

-Added by Himanshi Verma Science » Boilogy

Answer:

Himanshi Verma

 Echidna

-Answered by Himanshi Verma On 24 February 2019:05:04:53 PM


Question 24. Asked on :15 February 2019:03:37:07 PM

 What is conservation of energy? with example .

-Added by khushi chauhan Science » Science

Answer:

Himanshi Verma

 The law of conservation of energy states that energy can neither be created nor be destroyed, but it can be transformed from one form to another. So I considered an example of it as follows: water is stored at height with potential energy, the water flows and its potential energy is converted into kinetic energy.

-Answered by Himanshi Verma On 16 February 2019:05:30:10 PM


Question 25. Asked on :13 February 2019:05:39:09 PM

 Who wrote "Origin of Species"?

-Added by Shalu Shukla Science » Diversity In Living Organisms

Answer:

Himanshi Verma

 Charles Darwin

-Answered by Himanshi Verma On 24 February 2019:04:55:39 PM


Question 26. Asked on :11 February 2019:07:36:29 PM

 Difference between Longitudinal and Transverse waves.

-Added by Nishant Verma Science » Physics

Answer:

Himanshi Verma

Longitudes Waves:- In this wave, the particles of the medium vibrate in the direction of propagation of wave. Waves on spring or sound waves in air are examples of longitudinal waves.                                Transverse waves:- In this wave, the particles of the medium vibrate perpendicular to the direction of propagation of wave. Waves on strings under tension, waves on the surface of water are examples of transverse Waves.

-Answered by Himanshi Verma On 11 February 2019:07:59:17 PM


Question 27. Asked on :11 February 2019:07:31:19 PM

 Name some important compounds which we use in our everyday life.

-Added by Nishant Verma Science » Compounds

Answer:

Himanshi Verma

Carbon dioxide, carbon monoxide, Plaster of Paris, Portland Cement, Soaps, Glass, pesticides, Heavy water, hard water, hardening of oil, Medicines

-Answered by Himanshi Verma On 11 February 2019:07:56:33 PM


Question 28. Asked on :11 February 2019:07:29:24 PM

 Who discover cholera and TB germs?

-Added by Nishant Verma Science » G.k

Answer:

Himanshi Verma

 Robert Kock (1883) in Germany.

-Answered by Himanshi Verma On 11 February 2019:07:55:07 PM


Question 29. Asked on :11 February 2019:07:06:39 PM

 Write the full form of ATP.

-Added by Himanshi Verma Science » Fundamental Unit Of Life

Answer:

Himanshi Verma

 ATP stands for Adenosine Triphosphate . This is the energy currency of most cellular processes . The energy released during the process of respiraton is used to make an ATP molecule from ADP (Adenosine Diphosphate) and inorganic phosphate.

-Answered by Himanshi Verma On 13 February 2019:05:32:16 PM


Question 30. Asked on :11 February 2019:09:34:51 AM

 what do you mean by borax ?


-Added by Himanshi Verma Science » Chemistry

Answer:

Himanshi Verma

 Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. Powdered borax is white, consisting of soft colorless crystals that dissolve easily in water. Borax has a wide variety of uses.

-Answered by Himanshi Verma On 11 February 2019:05:42:09 PM


Question 31. Asked on :11 February 2019:09:30:54 AM

 why do we need to classify elements ?


-Added by Himanshi Verma Science » Chemistry

Answer:

Himanshi Verma

 The number of elements discovered has increased, making it difficult to remember the behavior and properties of these elements. Hence it is important to classify elements according to their properties. ... It helps us understand how different elements form different compounds.

-Answered by Himanshi Verma On 11 February 2019:05:42:36 PM


Question 32. Asked on :09 February 2019:11:06:07 AM

What happens when nitric acid is added to an egg shell?

-Added by ATP Admin Science » Chemical Reactions

Answer:

Himanshi Verma

 Eggs shell is made up of calcium carbonate, when it reacts with nitric acid it gives calcium nitrate, carbon dioxide and water the reaction is as follow;

CaCO3 + HNO3 → Ca(NO3)2 + CO2 + H2

-Answered by Himanshi Verma On 09 February 2019:04:17:50 PM


Question 33. Asked on :07 February 2019:03:15:00 PM

Q. Name the male reproductive part of a flower

-Added by Himanshi Verma Science » Chapter 12 Reproduction In Plants

Answer:

Himanshi Verma

 Male reproductive part is called Stemen which composed with Anther and pollen grains. 

-Answered by Himanshi Verma On 09 February 2019:04:18:10 PM


Question 34. Asked on :07 February 2019:03:10:18 PM

 what is the production of new individuals from the parents of the same species called :

-Added by Himanshi Verma Science » Chapter 12 Reproduction In Plants

Answer:

Himanshi Verma

 When two parents are involved in reproduction, the method is calledsexual reproduction. The male and female gametes fuse during fertilization toproduce zygote. The zygote subsequently develops into an embryo which further develops into a new individual.

-Answered by Himanshi Verma On 09 February 2019:04:20:30 PM


Question 35. Asked on :07 February 2019:03:05:32 PM

  1. state the main difference between Asexual and sexual  reproduction ?

-Added by Himanshi Verma Science » Chapter 12 Reproduction In Plants

Answer:

Himanshi Verma

 Sexual reproduction is a process which involves production of seeds. It requires two parents. Most plants reproduce sexually with the help of flowers. ... Question 4: State the main difference between asexual and sexual reproduction.

-Answered by Himanshi Verma On 09 February 2019:04:20:58 PM


Question 36. Asked on :07 February 2019:02:57:44 PM

Q. List the similarities & differences between aerobic & anaerobic respiration ?

-Added by Himanshi Verma Science » Chapter 10 Respiration In Organimns

Answer:

Himanshi Verma

 The similarities between aerobic and anaerobic respiration, is that they both use glucose as the starting molecule. This is called the substrate. In addition, bothaerobic and anaerobic respiration produce ATP, however, aerobic respiration produces a lot more ATP compared to anaerobic respiration.

-Answered by Himanshi Verma On 09 February 2019:04:21:25 PM


Question 37. Asked on :05 February 2019:05:47:19 PM

 A body of mass 4kg is taken for a height of 5m to a height 10m. Find the increase in Potential Energy

-Added by Harshita Rathore Science » Work And Energy

Answer:

Shalu Shukla

 ➧ Potential energy = mgh

➧ m = 4kg

➧ g = 10 m/s²


➧ Initial potential energy

➾ m g 5


➧ Final potential energy

➾ m g 10


➧ Change =

Final potential energy - Initial Potential 

Energy


➾ mg 10 - mg 5

➾ mg (10 -5)

➾ 5 x m x g

➾ 5 x 4 x 10

➾ 200 J 

-Answered by Shalu Shukla On 11 February 2019:05:52:18 PM


Question 38. Asked on :03 February 2019:10:47:35 AM

When baking soda is mixed with lemon juice, bubbles are formed with evolution of a gas. What type of change is it ?

-Added by Nishant Verma Science » Science

Answer:

Himanshi Verma

  When baking soda is mixed with lemon juicebubbles formed because of evolution of carbon dioxide gas. This is a chemical change, because in this reaction new substances are formed. Question 5: When a candle burns, both physical and chemical changes take place.

-Answered by Himanshi Verma On 03 February 2019:04:03:50 PM


Question 39. Asked on :02 February 2019:01:33:14 PM

 उर्जा का सबसे बड़ा स्त्रोत कोन सा है?

-Added by Shalu Shukla Science » Energy

Answer:

Nishant Verma

 Sun is the big source of energy

-Answered by Nishant Verma On 03 February 2019:10:17:36 AM


Question 40. Asked on :31 January 2019:10:17:28 AM

 What is concave mirror

-Added by praful kumar Science » Light

Answer:

Himanshi Verma

 concave mirror, or converging mirror, has a reflecting surface that bulges inward (away from the incident light). Concave mirrors reflect light inward to one focal point.They are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror

-Answered by Himanshi Verma On 02 February 2019:01:23:17 PM


Question 41. Asked on :31 January 2019:10:11:31 AM

 What is convex mirror.

-Added by praful kumar Science » Light

Answer:

Himanshi Verma

 If the reflecting surface of a spherical mirror is called a con cave mirror 

-Answered by Himanshi Verma On 02 February 2019:01:22:55 PM


Question 42. Asked on :31 January 2019:09:56:28 AM

What is virtual image.

-Added by praful kumar Science » Light

Answer:

Himanshi Verma

 The image formed by a place mirror could  not obtained on a screen such as image is    called avirtual image 

-Answered by Himanshi Verma On 02 February 2019:01:31:56 PM


Question 43. Asked on :30 January 2019:04:19:31 PM

 what is pendulumn?

-Added by Jyoti Srivastva Science » Motion And Time

Answer:

Himanshi Verma

 A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position.

-Answered by Himanshi Verma On 02 February 2019:01:32:33 PM


Question 44. Asked on :30 January 2019:04:17:46 PM

 what is the effect of HCL acid on turmeric solution?

-Added by Jyoti Srivastva Science » Acid Base And Salt

Answer:

Himanshi Verma

 Turmeric is yellow in colour. When a base is added to it, the solutionturns into pink colour. However turmeric remains yellow when an acid or neutralsolution is added to it.

-Answered by Himanshi Verma On 02 February 2019:01:32:49 PM


Question 45. Asked on :29 January 2019:10:31:40 AM

 Ozone acts as a natural shield against ultraviolet radiation explane.

-Added by Nitish kumar Science » Light

Answer:

Himanshi Verma

 The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation  [UVR] from the sun, protecting life on Earth from its potentially harmful effects. ... That is,the lower the ozone levels, the higher the solar  [UVR.] 

-Answered by Himanshi Verma On 02 February 2019:01:33:23 PM


Question 46. Asked on :28 January 2019:05:13:32 PM

 What is the PRISM ? 

-Added by Nitish kumar Science » Light

Answer:

Himanshi Verma

 A transparent material with three rectangular surfaces used for obtaining spectrum of light

-Answered by Himanshi Verma On 02 February 2019:01:33:40 PM


Question 47. Asked on :28 January 2019:05:00:17 PM

Name the source from which litmus solution is obtained . What is the use of this solution. 

-Added by Nitish kumar Science » Chemical And Physical Changes

Answer:

Himanshi Verma

 The litmus solution is obtained from lichen. It is used to check acid and base.

-Answered by Himanshi Verma On 02 February 2019:01:34:35 PM


Question 48. Asked on :28 January 2019:04:50:59 PM

What are the main processes involved in the water cycle . 

-Added by Nitish kumar Science » Water

Answer:

Himanshi Verma

 Water cycle, also called hydrologic cyclecycle that involves the continuous circulation of water in the Earth-atmosphere system. Of the many processes involved in the water cycle, the most importantare evaporation, transpiration, condensation, precipitation, and runoff.

-Answered by Himanshi Verma On 02 February 2019:01:35:37 PM


Question 49. Asked on :28 January 2019:04:46:39 PM

 Name two chemicals used to disinfect water .

-Added by Nitish kumar Science » Chemical And Physical Change

Answer:

Himanshi Verma

 When this contaminated water is used for drinking, it can cause diseases such as cholera, typhoid, hepatitis, dysentery, etc., which may even lead to death. Question 7: Name two chemicals used to disinfect water. Answer: Two chemicals used to disinfect water are chlorine and ozone. 

-Answered by Himanshi Verma On 02 February 2019:01:35:51 PM


Question 50. Asked on :28 January 2019:04:42:18 PM

 State the characteristics of the image formed by a plain mirror .

-Added by Nitish kumar Science » Light

Answer:

Himanshi Verma

 The image formed by a concave lens is always virtual, upright and erect. Question 4: State the characteristics of the image formed by a plane mirror. Answer: The image formed by a plane mirror is erect, laterally inverted, and of the same size as that of the object.

-Answered by Himanshi Verma On 02 February 2019:01:36:08 PM


Question 51. Asked on :28 January 2019:04:40:11 PM

Write the difference between uniform and Non uniform motion with explane .

-Added by Nitish kumar Science » Motion And Time

Answer:

Himanshi Verma

 The difference between uniform and non-uniform motion can be drawn clearly on the following grounds: When an object moves along a straight linewith a firm speed, the motion is said to be uniform motion. ... The object in a uniform motion covers same distances in an equal time period.

-Answered by Himanshi Verma On 02 February 2019:01:37:10 PM


Question 52. Asked on :28 January 2019:04:38:26 PM

State the differences between a convex and a concave lens . 

-Added by Nitish kumar Science » Light

Answer:

Himanshi Verma

 Convex lens: Thick at middle thin at edges. Can form real image.

Concave lens: Thin at middle thick at edges. Can form virtual image

-Answered by Himanshi Verma On 02 February 2019:01:37:24 PM


Question 53. Asked on :28 January 2019:04:32:24 PM

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes . calculate the total distance covered by the car .

-Added by Nitish kumar Science » Motion And Time

Answer:

Himanshi Verma

  25 km

-Answered by Himanshi Verma On 02 February 2019:01:37:35 PM


Question 54. Asked on :28 January 2019:04:30:21 PM

 Explain the three form of water that exists in nature .

-Added by Nitish kumar Science » Water

Answer:

Himanshi Verma

 Water is known to exist in three different states; as a solid, liquid or gas. Clouds, snow, and rain are all made of up of some form of water.

-Answered by Himanshi Verma On 02 February 2019:01:39:18 PM


Question 55. Asked on :28 January 2019:04:22:43 PM

Salma takes 15 minutes from her house to reach her school on a bicycle . if the bicycle has a speed of m/s, calculate the distance between her house and the school . 

-Added by Nitish kumar Science » Motion And Time

Answer:

Himanshi Verma

 Distance=240km

Time=4h

speed= distance÷time

        =240÷4

        =60km/h

-Answered by Himanshi Verma On 02 February 2019:01:39:45 PM


Question 56. Asked on :28 January 2019:10:21:07 AM

 which animal do photosynthesis.

-Added by Rohit Rajput Science » Animal Science

Answer:

Himanshi Verma

 Sea Slug.

-Answered by Himanshi Verma On 03 February 2019:04:20:21 PM


Question 57. Asked on :27 January 2019:11:20:09 AM

 find the very reactive  metals? 


-Added by SURAJ KUMAR Science » Chemistry

Answer:

Himanshi Verma

 Francium is the high reactive metal.

-Answered by Himanshi Verma On 02 February 2019:01:42:40 PM


Question 58. Asked on :27 January 2019:11:15:37 AM

 Find the melting point of tanghstan?

-Added by SURAJ KUMAR Science » Physicas

Answer:

Himanshi Verma

3,422 °C  

-Answered by Himanshi Verma On 02 February 2019:01:42:58 PM


Question 59. Asked on :27 January 2019:11:11:38 AM

 find the atomic number and valancy of potasium

-Added by kunal kumar Science » Chemistry

Answer:

Himanshi Verma

 Atomic number is 19 and valency is 1

-Answered by Himanshi Verma On 02 February 2019:01:44:01 PM


Question 60. Asked on :27 January 2019:11:02:35 AM

 write the formula of bleching power.

-Added by SURAJ KUMAR Science » Chemistry

Answer:

Nitish kumar

 Ca(ClO)2

-Answered by Nitish kumar On 27 January 2019:03:13:16 PM


Question 61. Asked on :27 January 2019:10:41:41 AM

 which endocrine gland produce insulin hormone ?

-Added by kunal kumar Science » Biology

Answer:

Himanshi Verma

 The most important hormone that the pancreas produces is insulin. Insulin is released by the 'beta cells' in the islets of Langerhans in response to food. Its role is to lower glucose levels in the bloodstream and promote the storage of glucose in fat, muscle, liver and other body tissues.

-Answered by Himanshi Verma On 02 February 2019:01:47:15 PM


Question 62. Asked on :27 January 2019:10:34:41 AM

 defind the function of eye lens ?


















-Added by praful kumar Science » Physics

Answer:

Himanshi Verma

 The lens is located in the eye. By changing its shape, the lens changes the focal distance of the eye. In other words, it focuses the light rays that pass through it (and onto the retina) in order to create clear images of objects that are positioned at various distances.

-Answered by Himanshi Verma On 02 February 2019:01:47:42 PM


Question 63. Asked on :27 January 2019:10:27:57 AM

 write the equation of endothermic and exothermic reaction ?

-Added by praful kumar Science » Chemistry

Answer:

Himanshi Verma

 Endothermic reaction examples equations

Endothermic vs. exothermic reactions
  • The teacher replies: “That's because you were given two different salts. ...
  • Consider the reaction mixture—salt plus water—as the system and the flask as the surrounding.
  • 1) Photosynthesis: Plants absorb heat energy from sunlight to convert carbon dioxide and water into glucose and oxygen.

-Answered by Himanshi Verma On 02 February 2019:01:48:05 PM


Question 64. Asked on :24 January 2019:10:28:36 AM

Who discovered the small pox vaccine?  

-Added by praful kumar Science » Natural

Answer:

Himanshi Verma

 Edward Jenner

-Answered by Himanshi Verma On 03 February 2019:04:28:16 PM


Question 65. Asked on :24 January 2019:10:27:07 AM

Who proposed the binomial nomenclature?

-Added by Akki chauhan Science » N

Answer:

Himanshi Verma

  Carolous linneas

-Answered by Himanshi Verma On 24 January 2019:05:01:03 PM


Question 66. Asked on :24 January 2019:10:22:28 AM

Vaccine of small 

-Added by praful kumar Science » Natural

Answer:

Himanshi Verma

 The first successful vaccine to be developed, was introduced by Edward Jenner in 1796. He followed up his observation that milkmaids who had previously caught cowpox did not later catch smallpox by showing that inoculated cowpox protected against inoculated smallpox.

-Answered by Himanshi Verma On 24 January 2019:05:13:05 PM


Question 67. Asked on :24 January 2019:10:08:08 AM

 which IR-36 is improoved variety of

-Added by Akki chauhan Science » Natural

Answer:

Himanshi Verma

 IR-36 is improved variety of rice.

-Answered by Himanshi Verma On 03 February 2019:04:28:59 PM


Question 68. Asked on :24 January 2019:10:16:03 AM

 chemical responsible for ozone depletion

-Added by priyanshu kumar Science » Natural

Answer:

Himanshi Verma

 Chluro fluro carbons (CFCs) responsible for ozone depletion.

-Answered by Himanshi Verma On 25 January 2019:05:08:34 PM


Question 69. Asked on :24 January 2019:10:05:52 AM

 Gonorrhoea, a sexuaaly transmitted disease is caused by:

-Added by Akki chauhan Science » Natural

Answer:

Himanshi Verma

 Gonorrhea is a sexually transmitted disease (STD). You get it from having sex with someone who is infected with it. Some people call it “the clap.” Gonorrheausually causes pain and other symptoms in your genital tract, but it can also causeproblems in your rectum, throat, eyes, or joints.

-Answered by Himanshi Verma On 24 January 2019:05:01:51 PM


Question 70. Asked on :24 January 2019:10:05:06 AM

 In which animals,cutaneous respiration takes place?

-Added by Akki chauhan Science » G.k

Answer:

Himanshi Verma

 Cutaneous respiration is a form of respiration in which gas exchange occurs across the skin rather than the lungs or gills. They occur in many organisms like insects, amphibians, fish, sea snakes, turtles and few mammals too.

-Answered by Himanshi Verma On 24 January 2019:05:02:53 PM


Question 71. Asked on :24 January 2019:10:00:07 AM

 4-D chemical is used in

-Added by Akki chauhan Science » Biology

Answer:

Himanshi Verma

 4-d chemical is ussualy used as a weedicide. 

-Answered by Himanshi Verma On 26 January 2019:12:28:56 AM


Question 72. Asked on :24 January 2019:09:55:44 AM

In which organism the eukarytic cell is found without plastid ?

-Added by Nitish kumar Science » Cell

Answer:

Akki chauhan

  Bacteria organism the eukarytic cell is found without plastid 

-Answered by Akki chauhan On 01 March 2019:01:00:07 PM


Question 73. Asked on :24 January 2019:09:59:18 AM

which animal is egg laying mammal?

-Added by Akki chauhan Science » Natural

Answer:

Himanshi Verma

 Echidna  

-Answered by Himanshi Verma On 24 January 2019:04:58:51 PM


Question 74. Asked on :24 January 2019:09:55:02 AM

which chemical is responsible for Ozone depletion is 

-Added by Akki chauhan Science » Natural

Answer:

Himanshi Verma

 Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens(chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).

-Answered by Himanshi Verma On 24 January 2019:05:03:53 PM


Question 75. Asked on :24 January 2019:09:50:45 AM

 water vascular system for locomotion is found in 

-Added by Akki chauhan Science » Natural

Answer:

Himanshi Verma

 The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. The system is composed of canals connecting numerous tube feet.

-Answered by Himanshi Verma On 24 January 2019:05:05:09 PM


Question 76. Asked on :21 January 2019:11:03:42 AM

 full form of VIBGOUYR

-Added by Akki chauhan Science » G.k

Answer:

Himanshi Verma

 Violent, Indigo, Blue, Green, Yellow, Orange, Red.

-Answered by Himanshi Verma On 03 February 2019:04:39:53 PM


Question 77. Asked on :21 January 2019:09:53:45 AM

 which is element most hardest in the world ?

-Added by Akki chauhan Science » Science

Answer:

Himanshi Verma

 Diamond is the hardest naturally occurring substance found on Earth. But it is not the hardest substance. Wurtzite boron nitride (synthetic) and lonsdaleite (which comes from meteorites) are both harder.


-Answered by Himanshi Verma On 21 January 2019:05:25:34 PM


Question 78. Asked on :20 January 2019:05:01:17 PM

 Who discovered vaccine name the parson .

-Added by Jyoti Srivastva Science » Ch-2

Answer:

Akki chauhan

 Vaccine is discovered by Edward Jenner

-Answered by Akki chauhan On 21 January 2019:09:17:20 AM


Question 79. Asked on :20 January 2019:04:39:52 PM

प्रोटोप्लाज्मा का संगठन क्या है?

-Added by Shama Khatun Science » Ch-5

Answer:

Himanshi Verma

 संगठन (organisation) वह सामाजिक व्यवस्था या युक्ति है जिसका लक्ष्य एक होता है, जो अपने कार्यों की समीक्षा करते हुए स्वयं का नियन्त्रण करती है, तथा अपने पर्यावरण से जिसकी अलग सीमा होती है। संगठन तरह-तरह के हो सकते हैं - सामाजिक, राजनैतिक, आर्थिक, सैनिक, व्यावसायिक, वैज्ञानिक आदि।

परिचय

जब दो या दो से अधिक व्यक्ति मिलकर किसी एक उद्देश्य की प्राप्ति के लिए कार्यशील होते हैं तो संगठन की आवश्यकता पड़ती है। उद्देश्य के अल्पकालीन होने से संगठन की आवश्यकता में कमी नहीं आती। यदि कुछ व्यक्तियों को मिलकर भारी वजन उठाना हो तो इस क्षणिक उद्देश्य की पूर्ति के लिए संगठन की आवश्यकता होती है। किसी भी व्यावसायिक उपक्रम के लिए व्यवसाय प्रारंभ करने के पूर्व से उसको संचालित करने के लिए संगठन का निर्माण कर लिया जाना चाहिए। बगैर संगठन के किसी भी उद्देश्य की प्रभावपूर्ण ढंग से पूर्ति संभव नहीं है। एक अच्छा संगठन किसी निष्क्रिय उपक्रम को भी जीवन प्रदान कर सकता है। एक कमजोर संगठन अच्छे उत्पाद को मिट्टी में मिला सकता है जबकि एक अच्छा संगठन जिसके पास कमजोर उत्पाद है, अपने से अच्छे उत्पाद को बाजार से निकाल सकता है। 

-Answered by Himanshi Verma On 10 March 2019:04:51:49 PM


Question 80. Asked on :20 January 2019:04:35:33 PM

 क्रिस्टी क्या है?

-Added by Shama Khatun Science » Ch-5

Answer:

Himanshi Verma

 किसी भी चीज़ की रचना को क्रिस्टी कहते है |

-Answered by Himanshi Verma On 20 January 2019:04:42:08 PM


Question 81. Asked on :20 January 2019:01:11:59 PM

 when celebrate world health  day ?

-Added by Sumitra Mahajan Science » Health

Answer:

Himanshi Verma

 Sunday 7 april.

-Answered by Himanshi Verma On 20 January 2019:04:14:37 PM


Question 82. Asked on :20 January 2019:11:59:56 AM

 What is full form of WHO?

-Added by Sumitra Mahajan Science » Ch_13

Answer:

Himanshi Verma

 World Health Organisation.

-Answered by Himanshi Verma On 20 January 2019:04:17:51 PM


Question 83. Asked on :20 January 2019:11:04:33 AM

 Define a negative, positive and zero.

-Added by Prince Rawat Science » Work And Energy

Answer:

Himanshi Verma

 Actually, zero is neither a negative or a positive number. The whole idea ofpositive and negative is defined in terms of zeroNegative numbers are numbers that are smaller than zero, and positive numbers are numbers that are bigger thanzero. 

-Answered by Himanshi Verma On 20 January 2019:04:18:58 PM


Question 84. Asked on :20 January 2019:11:01:56 AM

 Define law of conservation of energy.

-Added by Prince Rawat Science » Work And Energy

Answer:

Himanshi Verma

 जब उर्जा का एक रूप उर्जा के दुसरे रूप में रूपांतरित होता है तब कुल उर्जा की मात्रा अचार रहती है 

1.उर्जा की न तो उत्पती हो सकती हल और न ही विनाश 

2.बल्कि उर्जा रूपांतर के दौरान कुछ उर्जा बेकार हो जाती है लेकिन निकाय की कुल उर्जा आवर्तित रहती है|

-Answered by Himanshi Verma On 20 January 2019:04:19:28 PM


Question 85. Asked on :20 January 2019:11:00:15 AM

 How many joules are there in 1 kilowatt hours. 

-Added by Prince Rawat Science » Work And Energy

Answer:

Himanshi Verma

 1000 joules

-Answered by Himanshi Verma On 20 January 2019:04:22:17 PM


Question 86. Asked on :20 January 2019:10:53:15 AM

 What are the plastids? 

-Added by Himanshi Verma Science » Fundamental Unit Of Life

Answer:

Himanshi Verma

 Plant cells: Plastids: As previously mentioned, plastids are doubled membraned 'sac-like' organelles, generally involved in either the manufacture or storage of food. They include chloroplasts, chromoplasts and leucoplasts.

-Answered by Himanshi Verma On 20 January 2019:04:20:28 PM


Question 87. Asked on :20 January 2019:10:24:57 AM

 The power of an electric heater is 1500 watt. How much energy it consumed in 10 hours.

-Added by Rohit Rajput Science » Work And Energy

Answer:

Himanshi Verma

  Watt = 1500(w)

 Taken time = 10 hours 

 power of an electric heated is = 

 = 15001000 = 1.5kw 

 t = 10 hours 

 Energy = power × Taken time 

            = 1.5 kw × 10 h 

            = 15kwh


-Answered by Himanshi Verma On 20 January 2019:04:22:55 PM


Question 88. Asked on :20 January 2019:10:21:52 AM

Five electric fans of 120 watts each are used for 4 hour. calculate the electrical energy consumed in Kilowatt hours.  

-Added by Rohit Rajput Science » Work And Energy

Answer:

Himanshi Verma

 Five electric fans of watt = 120×5

                                    = 600(W) 

taken time = 4 hours

power of fans = 600(W)=

                                   = 6001000 kw

                                   =0.6kw 

energy = power × taken time 

           = 0.6kw × 4h 

           = 2.4kwh.

-Answered by Himanshi Verma On 20 January 2019:04:23:20 PM


Question 89. Asked on :19 January 2019:07:14:05 PM

 Right part of human heart contains

   A) Oxygenated blood 

   B) De- oxygenated blood

   C) Mixed blood 

   D) No blood


-Added by Himanshi Verma Science » Biological

Answer:

Himanshi Verma

 De- oxygenated blood

-Answered by Himanshi Verma On 20 January 2019:04:26:41 PM


Question 90. Asked on :19 January 2019:04:51:49 PM

 What will happen to RBCs, if they are placed in hypertonic solution?

-Added by Himanshi Verma Science » Fundamental Unit Of Life

Answer:

Himanshi Verma

 A hypertonic solution means that there is more salt in the solution or external environment than within the red blood cellsWhen red blood cells are placed in a hypertonic solution, water within the cells move out via osmosis into thesurrounding solution, causing the red blood cells to shrink and shrivel.

-Answered by Himanshi Verma On 20 January 2019:04:27:07 PM


Question 91. Asked on :18 January 2019:05:19:11 PM

 Hydrogen and Oxygen combine in the ratio of 1:8 by mass to form water. What mass of Oxygen Gas would be required to react completely with 3gm of hydrogen gas ?

-Added by khushi chauhan Science » Atom And Molecules

Answer:

Himanshi Verma

 Since, the ration by which oxygen and hydrogen combine to give water is 1:8.

We can take it as "1g of hydrogen combines with 8g oxygen to give water''

So, 3g of hydrogen will combine with 3×8=24g of oxygen to give water.

-Answered by Himanshi Verma On 20 January 2019:04:29:23 PM


Question 92. Asked on :18 January 2019:05:18:45 PM

 What is Atomicity?


-Added by khushi chauhan Science » Atom And Molecules

Answer:

Himanshi Verma

 The number of atom present in one molecule of an element is called Atomicity.

-Answered by Himanshi Verma On 20 January 2019:04:29:11 PM


Question 93. Asked on :17 January 2019:07:33:21 PM

 why the intercoversion of state of matter is considered as a physical change? give three reason to justify the answer.

-Added by khushi chauhan Science » Ismatterbrounduspure

Answer:

Himanshi Verma

 The interconversion of state of matter is considered as a physical change:-

1. No formation of new compound 

2. Formula of the element /compound remain same 

3. No colour and odour change is seen

-Answered by Himanshi Verma On 19 January 2019:04:21:47 PM


Question 94. Asked on :17 January 2019:07:33:21 PM

 why the intercoversion of state of matter is considered as a physical change? give three reason to justify the answer.

-Added by khushi chauhan Science » Ismatterbrounduspure

Answer:

Himanshi Verma

 The interconversion of the states of matter is a physical change due to the following reasons: The change is reversible. A substance can revert back to its original state by physical means. ... Ice, water and water vapour are chemically H2O although they are present as solid, liquid and gaseous states respectively.

-Answered by Himanshi Verma On 03 February 2019:04:44:45 PM


Question 95. Asked on :17 January 2019:07:33:21 PM

 why the intercoversion of state of matter is considered as a physical change? give three reason to justify the answer.

-Added by khushi chauhan Science » Ismatterbrounduspure

Answer:

Himanshi Verma

  Three reasons to justify that inter conversion of states of matter is considered as physical change : 

• No formation of new compound.

• Formula of the element/compound remains same 

• No colour or odour change is seen.


-Answered by Himanshi Verma On 19 January 2019:04:22:23 PM


Question 96. Asked on :17 January 2019:07:33:21 PM

 why the intercoversion of state of matter is considered as a physical change? give three reason to justify the answer.

-Added by khushi chauhan Science » Ismatterbrounduspure

Answer:

Himanshi Verma

 The interconversion of the states of matter is a physical change due to the following reasons: The change is reversible. A substance can revert back to its original state by physical means. ... Ice, water and water vapour are chemically H2O although they are present as solid, liquid and gaseous states respectively.

-Answered by Himanshi Verma On 10 March 2019:04:52:43 PM


Question 97. Asked on :17 January 2019:07:33:21 PM

 why the intercoversion of state of matter is considered as a physical change? give three reason to justify the answer.

-Added by khushi chauhan Science » Ismatterbrounduspure

Answer:

Himanshi Verma

 The interconversion of the states of matter is a physical change due to the following reasons: The change is reversible. A substance can revert back to its original state by physical means. ... Ice, water and water vapour are chemically H2O although they are present as solid, liquid and gaseous states respectively.

-Answered by Himanshi Verma On 03 February 2019:04:45:04 PM


Question 98. Asked on :17 January 2019:05:18:57 PM

 पदार्थ के कणों के तीन अभिलाक्षनो लिखिए?

-Added by Shama Khatun Science » हमारे आस पास के पदार्थ

Answer:

Himanshi Verma

 1. पधार्थ के कण निरंतर गतिशील रहते है |

2. पदार्थ के कणों के बीच रिक्तस्थान होता है |

3. पधार्थ के कण एक दुसरे को आकर्षित करते है |

-Answered by Himanshi Verma On 18 January 2019:05:27:42 PM


Question 99. Asked on :17 January 2019:10:32:33 AM

 who was tha liquid metel 

-Added by Nitish kumar Science » Metel

Answer:

Himanshi Verma

  Liquid metal consists of alloys with very low melting points which form a eutectic that is liquid at room temperature. The standard metal used to be mercury, but gallium-based alloys, which are lower both in their vapor pressure at room temperature and toxicity, are being used as a replacement in various applications.

-Answered by Himanshi Verma On 17 January 2019:05:24:18 PM


Question 100. Asked on :16 January 2019:06:16:06 PM

 Which of the following subtances undergo sublimation on heating 

a) Iodine     b) Napthelene             c) Camphor 

-Added by Himanshi Verma Science » Chemistry

Answer:

praful kumar

 The subtances which undergo sublimation on heating is napthelene and camphor.

-Answered by praful kumar On 20 January 2019:10:07:53 AM


Question 101. Asked on :16 January 2019:05:40:29 PM

 what is kerogen oil?


-Added by Himanshi Verma Science » G.k

Answer:

Himanshi Verma

  Kerogen is a mixture of organic chemical compounds that make up a portion of the organic matter in sedimentary rocks. ... Shales rich inkerogens that have not been heated to a warmer temperature to release their hydrocarbons may formoil shale deposits.

-Answered by Himanshi Verma On 19 January 2019:10:07:10 AM


Question 102. Asked on :15 January 2019:06:06:35 PM

 Explain why the below statements about displacements are not true.

  1. Displacements cannot be zeroDisplacements cannot be zero
  2. The magnitude of displacements are always greater than the distance travelled.The magnitude of displacements are always greater than the distance travelled.

-Added by Harshita Rathore Science » Motion

Answer:

Himanshi Verma

 (a) Not true, because if the initial and final position of the object is the same displacement can become zero.

 
(b) Not true, because, displacement is the shortest measurable distance between the initial and final positions of an object. It cannot be greater than the magnitude of the distance travelled by an object, but it can be smaller than the magnitude of the distance travelled by an object or , it may be equal to the distance travelled by the object.

-Answered by Himanshi Verma On 20 January 2019:05:21:27 PM


Question 103. Asked on :15 January 2019:06:04:35 PM

 A man walks around a square street of side 10 m in 40 sec. Calculate the displacement of the man at the end of 2 minutes 20 seconds.

-Added by Himanshi Verma Science » Motion

Answer:

Himanshi Verma

 The man takes 40 sec to cover ( 4 * 10 ) 40 metres. This shows he covers one metre in one sec.

In 2 min 20 sec (140 sec) , he will cover a distance of  140 metres.

Thus he completes  14040 = 3.5 rounds in 2 min 20 sec.

Hence it is noticed that he will be at the opposite side from where he started.

Now considering two simple cases.

Case (i)

If the man started at a corner of the square street:

In this case, the man would be diagonally opposite to the place from where he started

Displacement = diagonal of square with side 10 metre.

=   102+102

=   100

=14.1m

Case (ii)

The man started from the middle of the road.

After the end time, he is in the opposite side of the road.

Hence, the displacement is 10 metre.

-Answered by Himanshi Verma On 19 January 2019:04:25:08 PM


Question 104. Asked on :15 January 2019:06:03:25 PM

  What would happen if the plasma membrane ruptures or breaks down?

-Added by Himanshi Verma Science » Fundamental Unit Of Life

Answer:

Himanshi Verma

  If the plasma membrane ruptures or breakdown then the cell will not be able to exchange material from its surrounding by diffusion or osmosis. Thereafter the protoplasmic material will be disappeared and the cell will die

-Answered by Himanshi Verma On 16 January 2019:05:14:33 PM


Question 105. Asked on :15 January 2019:06:00:52 PM

  How do substances like CO2 and water move in and out of the cell? Discuss.

-Added by Sumitra Mahajan Science » Fundamental Unit Of Life

Answer:

Himanshi Verma

 CO2 moves by diffusion and H2O  move by osmosis through cell membrane.

-Answered by Himanshi Verma On 19 January 2019:04:25:30 PM


Question 106. Asked on :15 January 2019:05:44:19 PM

 A bullet is fired from a rifle the kinetic energy of the rifle in comparison to that of the bullet is

-Added by Sumitra Mahajan Science » Force And Laws Of Motion

Answer:

Himanshi Verma

 a) more than one b) less than one c) equal to one d) zero


Let,
M -mass of life
v- velocity of rifle
m -mass of bullet
u -velocity of bullet
Mv=mu
KrKb=12Mv212mv2
(Mv)2(Mu)2×mM=mM
Since m < M
Kb>Kr
Therefore KineticenergyofrifleKineticenergyofbullet<1
Hence b is the correct answer. Hence b is the correct answer. 

 

-Answered by Himanshi Verma On 20 January 2019:05:18:11 PM


Question 107. Asked on :15 January 2019:04:34:37 PM

 A cool soft drinks kept on a balance when its cap is removed is weight

a) Increase                          b) Decrease

c) First increase than decrease          d) First decrease than increase

-Added by Harshita Rathore Science » G.k

Answer:

Himanshi Verma

 First increase than decrease

-Answered by Himanshi Verma On 16 January 2019:05:23:43 PM


Question 108. Asked on :15 January 2019:04:23:59 PM

 The metal is constituent of chlorophyll. Write the name of metal.

 

-Added by Harshita Rathore Science » G.k

Answer:

Himanshi Verma

 Magnesium

-Answered by Himanshi Verma On 16 January 2019:06:03:03 PM


Question 109. Asked on :15 January 2019:09:47:53 AM

 What is electro magnet.

-Added by Prince Rawat Science » Electric Current And Its Effect

Answer:

Himanshi Verma

 An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity.

-Answered by Himanshi Verma On 19 January 2019:04:34:25 PM


Question 110. Asked on :14 January 2019:05:36:38 PM

 What is the full name of J.J Thomson?

-Added by Himanshi Verma Science » Atom And Molecules

Answer:

Prince Rawat

 Joseph john thomson.

-Answered by Prince Rawat On 15 January 2019:10:20:32 AM


Question 111. Asked on :14 January 2019:05:09:17 PM

 Boiling point of alcohal is 78º C. Change into Kelvin Scale. 

-Added by Himanshi Verma Science » Matter Around Us

Answer:

Akki chauhan

   78+273=351 kelvin

-Answered by Akki chauhan On 16 January 2019:10:12:56 AM


Question 112. Asked on :14 January 2019:05:08:10 PM

 

-Added by Himanshi Verma Science » Matter Around Us


Question 113. Asked on :14 January 2019:05:04:06 PM

1.  What is the scientific name of tiger and lizard?

2. Which of the following is multicellular organism.

      a) Amoeba                b) Ostrich. 


-Added by Himanshi Verma Science » Divesity In Living Organisms

Answer:

Akki chauhan

   1) scientific name of tiger is panthera tigris and scientific name of lizard is lacertilia. 2) ostrich is multicellular organism.

-Answered by Akki chauhan On 16 January 2019:10:12:35 AM


Question 114. Asked on :14 January 2019:09:16:13 AM

 Write the chemical formula of Sodium bicarbonate


-Added by Akki chauhan Science » Chemistry

Answer:

Akki chauhan

  NaHCO3

-Answered by Akki chauhan On 15 January 2019:09:50:05 AM


Question 115. Asked on :13 January 2019:04:49:55 PM

 A tortoise moves a distance of 100m in 15min. What is its average speed in km/hr?

-Added by Himanshi Verma Science » Force And Laws Of Motion

Answer:

Himanshi Verma

 Given:  Tortoise moves 100 meters in 15 minutes.


Therefore, Average Speed = 100 meters /15 minutes  


(as Speed = Distance/time)


                                                    = 0.10 Km/ 0.25 hours


 (as 1 Km

= 1000 m and 1 hour = 60 min)


                                                     = 0.4 Km/hour


Answer – The average speed of tortoise is 0.4 Km/hour


Read more on Brainly.in - https://brainly.in/question/36576#readmore

-Answered by Himanshi Verma On 20 January 2019:05:13:43 PM


Question 116. Asked on :13 January 2019:04:45:46 PM

What is the atomicity of Iodine?

-Added by Himanshi Verma Science » Atom And Molecules

Answer:

Akki chauhan

 The atomicity of iodine is Diatomic. 

-Answered by Akki chauhan On 14 January 2019:09:06:14 AM


Question 117. Asked on :13 January 2019:04:44:45 PM

 In which medium sound travels fastest: air, water or steel?

-Added by khushi chauhan Science » Sound

Answer:

Akki chauhan

   In Steel sound travel fastest.

-Answered by Akki chauhan On 14 January 2019:09:06:39 AM


Question 118. Asked on :13 January 2019:01:19:43 PM

 Write application of Ultrasound?

-Added by Himanshi Verma Science » Sound

Answer:

Himanshi Verma

   1). It is used to detect cracks in metal block in Industries without damaging them.

2). It is used in industries to clean "hard to reach" part of objects such as spiral tubes, odd shaped machine etc.

3). It is used to investigate the internal organs of human body such as liver, gall bladder, kidney, uterus and heart.

-Answered by Himanshi Verma On 16 January 2019:05:15:29 PM


Question 119. Asked on :13 January 2019:11:27:09 AM

 A machine lift up of weight of 50kg at the height of 25m in 10min. calculate the work done and also calculate the power of machine? 

-Added by Himanshi Verma Science » Work And Energy

Answer:

Akki chauhan

  Mass = 50kg ,   height= 25m  

work done = mg×h

                =50×10×25

                =12500 joule

Time= 10min

change into sec = 10×60

                      =600 sec


power of the machine= work done Time 

   

                               = 12500600 = 2.08333 watt

-Answered by Akki chauhan On 15 January 2019:09:48:56 AM


Question 120. Asked on :13 January 2019:11:18:06 AM

 State the reflection of sound.

-Added by Akki chauhan Science » Sound

Answer:

Shalu Shukla

 The following two laws of reflection of light are applicable to sound waves as well :-

1. The incident ray, the normal ray to reflecting surface and the reflected ray at the point of incidence ray lie in the same plane. 

2. The angle of incidence ∠i equal to the angle of reflection ∠r. 

-Answered by Shalu Shukla On 16 January 2019:05:52:45 PM


Question 121. Asked on :13 January 2019:11:14:25 AM

 what is the full form of AIDs?

-Added by Himanshi Verma Science » Why Do We Fall Ill?

Answer:

Akki chauhan

 The full form of AIDS is "Acquired Immune deficiency System".

-Answered by Akki chauhan On 14 January 2019:10:02:47 AM


Question 122. Asked on :12 January 2019:05:46:00 PM

 Explain nitrogen cycle with the help of diagram?

-Added by Himanshi Verma Science » Natural Resources

Answer:

Rohit Rajput

The series of processes by which nitrogen and its compounds are inter converted in the environment and in living organisms, including nitrogen fixation and decomposition.

-Answered by Rohit Rajput On 13 January 2019:10:25:37 AM


Question 123. Asked on :12 January 2019:05:42:22 PM

 Define potential and kinetic energy and also write its SI unit. 

-Added by Himanshi Verma Science » Work And Energy

Answer:

Akki chauhan

 Kinetic energy : The energy possessed by an object due to its state of motion is called Kinetic energy

The S.I unit is Joule.

Potential energy : The energy of body due to its position or change in shape is known as potential energy.

The S.I unit is Joule.

-Answered by Akki chauhan On 13 January 2019:11:28:46 AM


Question 124. Asked on :12 January 2019:05:37:15 PM

Difference between mass and weight?

  

-Added by khushi chauhan Science » Gravitation

Answer:

Himanshi Verma

  Mass:-

1. We can measure of an object by its inertia. 

2. The total quantity of matter contained in an object is called mass of an object.

3. Mass of the object remains constant at all the places.

4. Measurement of mass is done by using a pan or beam balance.

5.Mass of a body cannot change even value of g is zero at any place.


Weight:-

1. Weight=mass ×acceleration 

2. The gravitational force by which earth attracts an object is called weight of the object.

3. Weight of the object is different at all different places.

4. Measurement of weight is done by using a spring balance. 

5. Weight of the object becomes zero if g is zero. 

-Answered by Akki chauhan On 14 January 2019:10:02:25 AM

-Answered by Himanshi Verma On 14 January 2019:05:54:06 PM


Question 125. Asked on :12 January 2019:05:27:17 PM

 What is the relationship between G and g ?

-Added by Himanshi Verma Science » Gravitation

Answer:

Akki chauhan

 Gravitational Constant (G) :-

1. Its value is 6.6734×10-11 Nm2/Kg2.

2. Its value remains constant always and everywhere.

3. Its S.I unit is Nm2/kg2.

4. It is Scaler Quantity. 

 Gravitational acceleration (g):-

1. Its value is 9.8 m/s2.

2. Its value varies at different Places. 

3. Its unit is m/s2.

4. It is a vector Quantity.

-Answered by Akki chauhan On 15 January 2019:09:47:38 AM


Question 126. Asked on :12 January 2019:05:26:14 PM

 Difference between infectious and non- infectious disease?

-Added by Himanshi Verma Science » Why Do We Fall Ill?

Answer:

Akki chauhan

   Infectious Disease :-

1. The disease which spread due to infection by microbes are called infectious. 

2. These could be cause due to pathogens like virus, bacteria. 

3. For Ex- Bacteria, Fungi Protozoa etc. 

Non-Infectious Disease :-

1. The disease which does not spread by contact between infected and healthy person through air water is called non infectious disease. 

2. These could be cause due to deficiency cancer, or injuries etc.

3. For ex- Heart Disease, Artritis. 

-Answered by Akki chauhan On 15 January 2019:09:46:41 AM


Question 127. Asked on :12 January 2019:05:24:29 PM

What is differences between communicable and non-communicable diseases? 

-Added by Himanshi Verma Science » Why Do We Fall Ill?

Answer:

Akki chauhan

 Communicable diseases are the diseases which passes from one individual to another individual. They are generally caused by some bacteria, viruses or any other pathogens. For example, malaria, AIDS etc. Non-communicable diseases are the diseases which does not spread from one person to another person. They are generally caused by some nutrient deficiency, allergy etc. Communicable diseases are inheritable compared to non-communicable diseases which can be heritable also. Communicable diseases can be treated by some conventional methods whereas non-communicale diseases needs special treatments. 


-Answered by Akki chauhan On 28 January 2019:10:24:13 AM


Question 128. Asked on :12 January 2019:11:14:43 AM

 Why sound waves are called mechanical waves. 

-Added by Rohit Rajput Science » Sound

Answer:

Akki chauhan

 You should know that the mechanical waves are those waves which require a medium for propagation. Sound needs a medium (solids, liquid, or gas) for their propagation and cann't travel without a medium. Therefore, sound wave is a mechanical wave. 

-Answered by Akki chauhan On 15 January 2019:09:46:22 AM


Question 129. Asked on :12 January 2019:11:07:42 AM

 Define the term mass number giving an example.

-Added by Akki chauhan Science » Atom And Molecules

Answer:

Akki chauhan

  Mass number is the sum of neutrons and protons. For example no. of protons in hydrogen is 1 and no. of neutrons is 0. So, 0+1=1, the mass of hydrogen is 1.

-Answered by Akki chauhan On 14 January 2019:09:59:13 AM


Question 130. Asked on :12 January 2019:11:05:19 AM

What is the nucleus of the atom?

-Added by Akki chauhan Science » Atom And Molecules

Answer:

Akki chauhan

   Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus with a very small contribution from the orbiting electronsNeutrons have no charge and protons are positively charged. Because the nucleus is only made up of protons and neutrons it is positively charged.

-Answered by Akki chauhan On 15 January 2019:09:46:08 AM


Question 131. Asked on :12 January 2019:11:02:38 AM

 How is the valency of an atom related to its electronic configuration?

-Added by Akki chauhan Science » Atom And Molecules

Answer:

Akki chauhan

  An atom according to its atomic number  arranges the electrons in the shells and when all electrons  are arranged then the electron (valence electrons) in the valence shell loses or gains electrons to complete octet and by doing so it gains negative or positive valency.

-Answered by Akki chauhan On 15 January 2019:09:45:48 AM


Question 132. Asked on :12 January 2019:11:01:34 AM

 Define electron, proton, and neutron.

-Added by Akki chauhan Science » Atom And Molecules

Answer:

Akki chauhan

  Electron=A Electron is a subatomic particle. Electrons have a negative electric charge. It is discovered by J.J Thomson.

Proton= Proton is also a Subatomic Particle which symbol is p with a positive charge. It is discovered by E.Rutherford. 

Neutrons= Neutron is also a subatomic particle which symbol is n with no electric charge and a mass slightly larger than that of proton. 

-Answered by Akki chauhan On 15 January 2019:09:45:31 AM


Question 133. Asked on :12 January 2019:10:59:35 AM

Write drawbacks of Rutherford ? 

-Added by Akki chauhan Science » Atom And Molecules

Answer:

Himanshi Verma

 Drawbacks of Rutherford’s model of atom

  • Rutherford proposed that electrons revolve at a high speed in circular orbits around the positively charged nucleus. When a charged particle i. e. electron revolves around positively charge nucleus, it needs to be accelerated so as to keep it moving in circular orbits. However, according to electromagnetic theory, whenever a charged particle such as an electron is accelerated around another charged center ( nucleus ) which are under force of attraction, there will be continuous radiation of energy. This loss of energy would slow down the speed of the electron. This would reduce the radius of the electron–orbit. Eventually the electron would fall into the nucleus. The result would be that the atom would collapse. But this does not happen. Thus Rutherford’s atom could not explain the stability of the atom. Failure of Rutherford’s model i.e. reduction of radius of orbit is shown below.
  • Rutherford proposed that electrons revolve around the nucleus in the fixed orbits. However, he did not specify the orbits and the number of electrons in each orbit.

-Answered by Himanshi Verma On 02 February 2019:01:52:05 PM


Question 134. Asked on :12 January 2019:10:45:01 AM

 Name the tissue which is responsible for movement in our body.

-Added by Rohit Rajput Science » Tissues

Answer:

Akki chauhan

 The tissue which is responsible for movement in our body is Muscular Tissue.

-Answered by Akki chauhan On 14 January 2019:09:57:12 AM


Question 135. Asked on :12 January 2019:10:43:22 AM

 Why is the cell called the structural and functional unit of life.

-Added by Rohit Rajput Science » The Fundamental Unit Of Life

Answer:

Akki chauhan

  Bricks are assembled to make a building. Similarly Cells are assembled to make our body of every organism. The brick is unit part of the building. Thus, Cells make tissue together the body so, we can say that cells are the basic structural unit of life of organism. 

-Answered by Akki chauhan On 15 January 2019:08:41:19 AM


Question 136. Asked on :12 January 2019:10:41:35 AM

 Define valency by taking examples of silicon and oxygen.

-Added by Rohit Rajput Science » Structure Of The Atom

Answer:

Akki chauhan

  The number of electrons lost or gained by an element in achieving 8 electrons in its outermost shell will be called its valency. The valency of silicon is 4 and oxygen is 2.


-Answered by Akki chauhan On 14 January 2019:09:56:30 AM


Question 137. Asked on :12 January 2019:10:39:40 AM

 Why is it not possible to see an atom with naked eyes.

-Added by Rohit Rajput Science » Atoms And Molecules

Answer:

Akki chauhan

  It is not possible to see an atom with naked eyes because all matter are made up very tiny particles called atom. And atom is undivisible particle which can not be divide by or hand.

-Answered by Akki chauhan On 14 January 2019:09:56:03 AM


Question 138. Asked on :12 January 2019:10:38:08 AM

What is meant by a substance?

-Added by Rohit Rajput Science » Is Matter Around Us Pure

Answer:

Akki chauhan

  Mixtures are constituted by more than one kind of pure form of matter,known as a substance.

-Answered by Akki chauhan On 16 January 2019:10:11:56 AM


Question 139. Asked on :12 January 2019:10:37:10 AM

A coolie carries luggage of a passenger along a long platform at a railway station. Has he done work on the luggage ? why? 

-Added by Akki chauhan Science » Work And Energy

Answer:

Akki chauhan

  He has work done work because a coolie carries luggage along a long platform and there is displacement so, here  work is done.

-Answered by Akki chauhan On 14 January 2019:09:55:33 AM


Question 140. Asked on :12 January 2019:10:35:16 AM

 Speed of a particle is doubled. What will be its new kinetic energy?

-Added by Akki chauhan Science » Work And Energy

Answer:

Rohit Rajput

 Four times of its initial value of kinetic energy.

-Answered by Rohit Rajput On 12 January 2019:10:37:14 AM


Question 141. Asked on :12 January 2019:10:34:10 AM

 Name four forms of energy other then mechanical energy

-Added by Akki chauhan Science » Work And Energy

Answer:

Akki chauhan

 The four forms of energy are as follows:-

1. Kinetic Energy                       2. Potential Energy 

3. Light Energy                          4. Electrical Energy 

and, 5. Solar Energy  

-Answered by Akki chauhan On 14 January 2019:09:55:11 AM


Question 142. Asked on :12 January 2019:10:27:48 AM

 State the relation between KWH and joule

-Added by Akki chauhan Science » Work And Energy

Answer:

Akki chauhan

  Himanshi Verma


 The relation between kilowatt hour and and joule is 

1KWH =3600000 Joule

and   1KWH=3.6Mj (Mega Joule )


                                     OR

We Know that KWH is a commercial unit 1KWH=1KW*1H

    1000W*1H 

    1Watt*sec =1Joule 

    1KWH=3600000 joule

-Answered by Akki chauhan On 14 January 2019:09:54:46 AM


Question 143. Asked on :12 January 2019:10:26:56 AM

 What do you mean by negative work ? Give its example.

-Added by Akki chauhan Science » Work And Energy

Answer:

Akki chauhan

  Work is said to be negative if force is acting opposite to the displacement. 

Examples= 1. Work done by a man while descending through   a staircase is negative. Man applies a force in vertically upward direction to balance his weight but displacement is in downward direction and work is negative.

2. Work done by force of friction on moving vehicles is negative. 

-Answered by Akki chauhan On 15 January 2019:08:40:30 AM


Question 144. Asked on :12 January 2019:10:24:21 AM

  What do you mean by positive work? Give two example in support.

-Added by Akki chauhan Science » Work And Energy

Answer:

Rohit Rajput
Work is said to be positive when force applied and the resulting displacement both are along the same direction.

Example: (i) A person climbing upward on a ladder (or staircase) does positive work against the force of gravity.

(ii) work done by horse while pulling a cart is positive work against the force of friction.  

-Answered by Rohit Rajput On 12 January 2019:10:30:14 AM


Question 145. Asked on :12 January 2019:10:22:37 AM

 What are the conditions for work can be zero

-Added by Akki chauhan Science » Work And Energy

Answer:

Akki chauhan

 The conditions for work done can be zero are as follows

1. There is no net force applied to the object.

2. Force is being applied but it does not cause any displacement.

-Answered by Akki chauhan On 14 January 2019:09:53:57 AM


Question 146. Asked on :12 January 2019:09:19:43 AM

 How much time will a pump of 1 KW power take to lift 500 litre of water to a height of 40 m ? Given that density of water is 1 kg litre and g= 10 m s-2

-Added by Akki chauhan Science » Work

Answer:

Himanshi Verma

 The potential energy to raise the water 

 =  mass of water (500kg, 1 liter of water is 1 kg) x gravitational pull(10m/s) x height (40m)


   500kg x 10m/s x 40m= 200000 joules (work, potential energy)


.Power = work / time


Therefore time = work 200000joules/power 1kw= 1000joules/s)


             time =  200000joules/1000joulse/s

                     = 200000/1000 s

                     = 200 s


Read more on Brainly.in - https://brainly.in/question/802414#readmore

-Answered by Himanshi Verma On 16 January 2019:05:59:15 PM


Question 147. Asked on :12 January 2019:09:16:39 AM

 Define the term work and energy .Write their S.I units?

-Added by Akki chauhan Science » Work And Energy

Answer:

Akki chauhan

 Energy : The capacity of doing work is known as energy . its S.I unit is joule.

Work :

-Answered by Akki chauhan On 12 January 2019:10:17:03 AM


Question 148. Asked on :11 January 2019:09:18:16 AM

 which mammal give egg and milk.

-Added by Rohit Rajput Science » Diversity In Living Organisms

Answer:

Akki chauhan

 The mammal give egg and milk is  Duck billed platypus.

-Answered by Akki chauhan On 11 January 2019:09:19:56 AM


Question 149. Asked on :10 January 2019:11:07:13 AM

 What is the nation bird of sri lanka?


-Added by Akki chauhan Science » G.k

Answer:

Rohit Rajput

 Junglefowl

-Answered by Rohit Rajput On 11 January 2019:08:43:53 AM


Question 150. Asked on :10 January 2019:11:03:51 AM

 Write the full form of AIDS and STD.


-Added by Akki chauhan Science » Why Do We Fall Ill?

Answer:

Akki chauhan

 The full form of STD is sexually transmitted diseases.

-Answered by Akki chauhan On 11 January 2019:09:11:24 AM


Question 151. Asked on :10 January 2019:10:40:38 AM

 Define taxonomy

-Added by Rohit Rajput Science » Divesity In Living Organisms

Answer:

Akki chauhan

 The branch of science that classify living organisms among different categories or group is called the taxonomy. It is the science of identifying and naming species into system of classification.

-Answered by Akki chauhan On 10 January 2019:10:48:10 AM


Question 152. Asked on :09 January 2019:10:49:47 AM

Write the universal law of gravitation. 

-Added by Master Purushottam Science » Gravitation

Answer:

Akki chauhan

 The law of gravitation states that the force of attraction between any two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them. The law applies to objects anywhere in the universe. Such a law is said to be universal.

-Answered by Akki chauhan On 10 January 2019:10:50:58 AM


Question 153. Asked on :09 January 2019:10:46:14 AM

 write the name of that living group in which structures named cilia and flagella  are found for moving around 

-Added by Master Purushottam Science » Divesity In Living Organisms

Answer:

Akki chauhan

   The group of living organisms is Protista kingdom which have the cilia and flagella like structure for the moving around.


-Answered by Akki chauhan On 11 January 2019:09:06:19 AM


Question 154. Asked on :09 January 2019:10:44:29 AM

 name the organisms which are out side of the classification.

-Added by Master Purushottam Science » Divesity In Living Organisms

Answer:

Rohit Rajput

  The organisms which are out side of the classification are virus and prions.


-Answered by Rohit Rajput On 11 January 2019:08:45:05 AM


Question 155. Asked on :09 January 2019:10:33:22 AM

 Write the scientific name of the snake?

-Added by Master Purushottam Science » D

Answer:

Rohit Rajput

 serpentes

-Answered by Rohit Rajput On 11 January 2019:08:33:31 AM


Question 156. Asked on :09 January 2019:10:27:20 AM

 who is the father of taxonomy?

-Added by Master Purushottam Science » Divesity In Living Organisms

Answer:

Akki chauhan

 Carolus Linnaeus

-Answered by Akki chauhan On 10 January 2019:10:52:50 AM


Question 157. Asked on :09 January 2019:10:25:19 AM

What is plastid? Write its two major functions.

-Added by Master Purushottam Science » The Fundamental Unit Of Life

Answer:

Himanshi Verma

 Leucoplasts lack pigments and so they are not green. They are located in roots and non-photosynthetic tissues of plantsThey can become specialized for bulk storage of starchlipid or protein and are then known as amyloplasts, elaioplasts, or proteinoplasts, respectively.

-Answered by Himanshi Verma On 02 February 2019:01:53:02 PM


Question 158. Asked on :09 January 2019:09:52:22 AM

 Ques. state the difference between aves and mammals?

 

-Added by Master Purushottam Science » Biology

Answer:

Rohit Rajput

 Aves: (i) These are warm blooded animals.

          (ii) They have four-chambered heart.

          (iii) They lay eggs.

          (iv) They Breathe through lungs.


Mammals: (i) Mammals are warm blooded animals.

                  (ii) They have four-chambered heart.

                  (iii) Most mammals familiar to us produce live young ones.

                  (iv) A few of them, like the platypus and the echidna lay eggs.

-Answered by Rohit Rajput On 12 January 2019:09:59:33 AM


Question 159. Asked on :09 January 2019:09:38:51 AM

 Ques. which planet cut the axis of the earth?

-Added by Master Purushottam Science » Star And Solar System

Answer:

Akki chauhan

 The planet cut the axis of the earth is Thia.


-Answered by Akki chauhan On 10 January 2019:09:52:55 AM


Question 160. Asked on :07 January 2019:10:41:52 AM

 What is joule's heat law? 

-Added by ATP Admin Science » Magnetic Effects Of Electricity

Answer:

Akki chauhan

 The joule's law of heating implies that heat produced in a resistor is

(i) directly proportional to the square of current for a given resistance, 

(ii) directly proportional to resistance for a given current, and 

(iii) directly proportional to the time for which the current flows through the resistor.

This law is known as joule's law of heating.

-Answered by Akki chauhan On 10 January 2019:10:55:38 AM


Question 161. Asked on :07 January 2019:12:54:06 AM

 What is retardation?

-Added by ATP Admin Science » Motion

Answer:

Akki chauhan

    Negative acceleration is called retardation.

-Answered by Akki chauhan On 10 January 2019:10:56:09 AM


Question 162. Asked on :07 January 2019:12:41:23 AM

What is S.I unit of energy?

-Added by ATP Admin Science » Energy

Answer:

Akki chauhan

 S.I unit is joule.

-Answered by Akki chauhan On 10 January 2019:10:56:31 AM


Question 163. Asked on :31 December 2018:02:13:26 PM

What do you understand by inter-cropping?

-Added by ATP Admin Science » Crops

Answer:

Akki chauhan

 When two or more are grown in the same field in definite pattern is called inter- cropping.

-Answered by Akki chauhan On 10 January 2019:10:44:57 AM


Question 164. Asked on :31 December 2018:01:49:06 PM

What is differences between speed and velocity?

-Added by ATP Admin Science » Speed And Velocity

Answer:

Jyoti Srivastva

 

SpeedVelocity
1. It is a scalar quantity.
2. It is a distance covered in unit time.
3. Average speed of moving object can not be zero. 
4. Speed of an object can never be zero. 
1. It is a vector quantity.
2. It is a displacement covered in unit time with direction.
3. Average velocity of moving object can be 
zero. 
4. Velocity of an object can be positive, negative 
or zero. 

-Answered by Jyoti Srivastva On 30 January 2019:04:39:24 PM


Question 165. Asked on :31 December 2018:12:06:37 PM

Write any three characteristiscs of colloids. 

-Added by ATP Admin Science » Solutions

Answer:

Akki chauhan

 Three characteristics of colloids are -

(i) They do not settle down when left undisturbed, that is, a colloid is quite stable.

(ii) They show tyndall effects. 

(ii) Colloidal particles can not be seperated by the process of filteration. 

-Answered by Akki chauhan On 10 January 2019:10:58:39 AM


Question 166. Asked on :31 December 2018:09:25:45 AM

What is sublimation?

-Added by ATP Admin Science » Matter Seperation

Answer:

Akki chauhan

 The process in which solids convert directly into gases and gases convert into solid is called sublimation.

-Answered by Akki chauhan On 14 January 2019:09:52:57 AM


Question 167. Asked on :30 December 2018:09:33:16 AM

What is common in all acids?

-Added by Pawan Kumar Science » Acid Base Salt

Answer:

Akki chauhan

 All acids have H+ ions. H+ ion is a chemical properties of acid. 

-Answered by Akki chauhan On 14 January 2019:09:52:42 AM


Question 168. Asked on :30 December 2018:12:07:49 AM

What is different between Ameter and galvanometer?

-Added by Master Purushottam Science » Electricity

Answer:

Akki chauhan

 Ameter measures the amount of current in a cunductor while galvanometer detects the current.

-Answered by Akki chauhan On 14 January 2019:09:52:22 AM


Question 169. Asked on :29 December 2018:02:15:17 AM

आपेक्षित घनत्व का मात्रक क्या होता है?

-Added by Apurva Institute Science » घनत्व

Answer:

Akki chauhan

 प्रायः किसी पदार्थ के घनत्व को पानी के घनत्व की तुलना में व्यक्त करना सुविधजनक होता है।

किसी पदार्थ का आपेक्षिक घनत्व उस पदार्थ का घनत्व व पानी के घनत्व का अनुपात है।

चूँकि आपेक्षिक घनत्व समान राशियों का एक अनुपात है, अतः इसका कोई मात्राक नहीं होता।

-Answered by Akki chauhan On 14 January 2019:09:51:56 AM


Question 170. Asked on :29 December 2018:01:35:07 AM

What is galvanometer?

-Added by Apurva Institute Science » Electricity

Answer:

Akki chauhan

 It is a device to detect current in an electric circuit.

-Answered by Akki chauhan On 14 January 2019:09:51:32 AM


Question 171. Asked on :28 December 2018:10:59:05 PM

What are the various uses of concave mirror?

-Added by ATP Admin Science » Light and Reflection

Answer:

Akki chauhan

 Use of cancave mirror; 

(i)    Concave mirrors are commonly used in torches, search-lights and vehicles headlights to get powerful parallel beams of light.

(ii)    They are often used as shaving mirrors to see a larger image of the face.

(iii)   Concave mirrors are used to see large images of the teeth of patients by the dentists.

(iv)   Large concave mirrors are used to concentrate sunlight to produce  heat in solar furnaces.

-Answered by Akki chauhan On 14 January 2019:09:51:10 AM


Question 172. Asked on :27 December 2018:03:52:45 PM

Who discovered the nucleus of an Atom?

-Added by ATP Admin Science » Atom and Its Structure

Answer:

Akki chauhan

 Ernest Rutherford discovered the nucleus of an atom

-Answered by Akki chauhan On 14 January 2019:09:50:50 AM


Question 173. Asked on :26 December 2018

Why cell is called structural and functional unit of body?

-Added by shyam Babu Science » cell

Answer:

Akki chauhan

  Cells perform all basic functions at cell label and also form the basic structure of body, that is why cell is called the structural and functional unit of body. 

-Answered by Akki chauhan On 01 March 2019:01:00:16 PM


 

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