Asked/Added Questions From NCERT: Science

Question 1. 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:

Master Mind

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 2. 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:

Master Mind

-Answered by Master Mind On 30 September 2020:02:20:34 AM

Question 3. 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:

Master Mind

-Answered by Master Mind On 30 September 2020:02:19:12 AM

Question 4. 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:

Master Mind

-Answered by Master Mind On 30 September 2020:02:15:50 AM

Question 5. 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:

Master Mind

-Answered by Master Mind On 30 September 2020:02:14:12 AM

Question 6. Asked on :30 September 2020:02:11:42 AM

सोनार की कार्यविधि तथा उपयोगों का वर्णन कीजिए।

-Added by Master Mind Science » Sound

Answer:

Master Mind

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 7. 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:

Master Mind

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 8. 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:

Master Mind

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 9. 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:

Master Mind

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 10. 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:

Master Mind
पनडुब्बी से वस्तु की दुरी d = 3625 m

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 11. Asked on :20 August 2020:06:10:37 PM

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Question 15. Asked on :06 August 2020:05:40:54 PM

What are solute?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
In order to be a true solution, a mixture must be stable. ... This is because the dissolved particles in a solution are very small, usually less than 1 nm in diameter. Solute particles can be atoms, ions, or molecules, depending on the type of substance that has been dissolved.

-Answered by Shruti Srivastva On 23 September 2020:05:35:38 PM

Question 16. Asked on :06 August 2020:05:40:16 PM

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:39:49 PM

Question 21. Asked on :06 August 2020:05:37:47 PM

What are solution?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

Solution, in chemistry, a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility. The term solution is commonly applied to the liquid state of matter, but solutions of gases and solids are possible.

-Answered by Shruti Srivastva On 23 September 2020:05:40:20 PM

Question 22. Asked on :06 August 2020:05:37:19 PM

What is solution?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

-Answered by Shruti Srivastva On 23 September 2020:05:40:36 PM

Question 23. Asked on :06 August 2020:05:37:00 PM

What are tissue?

-Added by Shruti Srivastva Science » Cell Structure And Function

Answer:

Shruti Srivastva
Group of cell.

-Answered by Shruti Srivastva On 27 August 2020:06:01:03 PM

Question 24. Asked on :06 August 2020:05:35:28 PM

What is tissue?

-Added by Shruti Srivastva Science » Cell Structure And Function

Answer:

Shruti Srivastva
Group of the cell doing a specific function.

-Answered by Shruti Srivastva On 27 August 2020:06:01:27 PM

Question 25. Asked on :06 August 2020:05:26:54 PM

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
muddy water.

-Answered by Shruti Srivastva On 23 September 2020:05:43:19 PM

Question 29. Asked on :06 August 2020:05:24:40 PM

Write one example of solution?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

sugar solution

-Answered by Shruti Srivastva On 23 September 2020:05:43:37 PM

Question 30. Asked on :06 August 2020:05:24:21 PM

What are solute?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
A solute is a substance that can be dissolved by a solvent to create a solution. A solute can come in many forms. It can be gas, liquid, or solid. The solvent, or substance that dissolves the solute, breaks the solute apart and distributes the solute molecules equally.\

Question 34. Asked on :06 August 2020:05:20:58 PM

Is solution homegenous or heterogenous?

-Added by Shruti Srivastva Science » Atom And Molecules

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:47:01 PM

Question 39. Asked on :06 August 2020:05:18:22 PM

What are solution?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
Solution, in chemistry, a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility. The term solution is commonly applied to the liquid state of matter

-Answered by Shruti Srivastva On 23 September 2020:05:47:13 PM

Question 40. Asked on :06 August 2020:05:17:55 PM

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva
Ribonucleic acid (RNA) is a molecule similar to DNA. Unlike DNA, RNA is single-stranded. An RNA strand has a backbone made of alternating sugar (ribose) and phosphate groups. Attached to each sugar is one of four bases--adenine (A), uracil (U), cytosine (C), or guanine (G

-Answered by Shruti Srivastva On 23 September 2020:05:51:52 PM

Question 57. Asked on :03 June 2020:11:32:34 AM

-Added by Manisha kumari Science » Matter In Our Surroundings

Answer:

Shruti Srivastva
273.16 K

-Answered by Shruti Srivastva On 24 August 2020:05:06:34 PM

Question 61. Asked on :26 May 2020:09:48:29 AM

What is plasmolysis?

-Added by Nishant Verma Science » Ch 5

Answer:

Nishant Verma

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 62. Asked on :26 May 2020:09:31:44 AM

What is Endocytosis?

-Added by Nishant Verma Science » Ch 5

Answer:

Nishant Verma

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 63. Asked on :26 May 2020:09:30:38 AM

Who discovered cell and when? And how?

-Added by Nishant Verma Science » Ch 1

-Added by Nishant Verma Science » Ch 1

Answer:

Nishant Verma

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 74. Asked on :25 May 2020:01:36:30 PM

What are the advantages of classification organisms?

-Added by Nishant Verma Science » Ch 1

Answer:

Nishant Verma

(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 75. 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:

Shruti Srivastva
Division Thallopyta.

-Answered by Shruti Srivastva On 24 August 2020:05:11:03 PM

Question 76. 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:

Shruti Srivastva
Protista.

-Answered by Shruti Srivastva On 24 August 2020:05:11:33 PM

Question 77. 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:

Shruti Srivastva
Unicellular and Eukaryotic.

-Answered by Shruti Srivastva On 24 August 2020:05:12:06 PM

Question 78. Asked on :25 May 2020:12:19:46 PM

Which of the following are chemical change?

-Added by Nishant Verma Science » Ch 2

Answer:

Nishant Verma

(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 79. 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:

Nishant Verma

Element: Sodium, Silver, Tin and silicon.

Compounds: Calcium Carbonate, Methane and C0_2.

Mixtures: Soil, Sugar, Coal, Air, Soap and blood.

-Answered by Nishant Verma On 25 May 2020:12:33:08 PM

Question 80. 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:

Shruti Srivastva
Milk and Starch Solution

-Answered by Shruti Srivastva On 24 August 2020:05:13:01 PM

Question 81. Asked on :25 May 2020:12:10:55 PM

Identify the solution among the following mixtures.

-Added by Nishant Verma Science » Ch 2

Answer:

Shruti Srivastva

Sea water, air and soda water.

-Answered by Shruti Srivastva On 24 August 2020:05:13:36 PM

Question 82. 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:

Nishant Verma

(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 83. 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:

Nishant Verma

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 84. Asked on :25 May 2020:09:06:10 AM

Classify the each of the following as a homogenoeus or a hetrogeneous mixture.

-Added by Nishant Verma Science » Ch 2

Answer:

Nishant Verma

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 85. 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:

Nishant Verma

(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 86. 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:

Nishant Verma

The Crystallisation method is used to purify.

-Answered by Nishant Verma On 25 May 2020:08:55:41 AM

Question 87. 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:

Nishant Verma

(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 88. Asked on :25 May 2020:08:25:52 AM

What is meant by a pure substance?

-Added by Nishant Verma Science » Ch 2

Answer:

Nishant Verma

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 89. 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:

Nishant Verma

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 90. Asked on :24 May 2020:08:28:55 PM

-Added by Nishant Verma Science » Ch 1

-Added by Shruti Srivastva Science » Cell

Answer:

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva

Nitrous husband

Sugar

Phosphate.

-Answered by Shruti Srivastva On 23 May 2020:07:08:57 PM

Question 117. Asked on :23 May 2020:07:06:04 PM

Which plant have the number of chromosomes?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva

Ophigolossum.

-Answered by Shruti Srivastva On 23 May 2020:07:07:14 PM

Question 118. Asked on :23 May 2020:07:04:42 PM

How many chromosomes are there in myrmectia?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva
1

-Answered by Shruti Srivastva On 23 May 2020:07:05:51 PM

Question 119. Asked on :23 May 2020:07:03:31 PM

How many chromosome are there in human beings?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva

-Answered by Shruti Srivastva On 23 May 2020:07:04:28 PM

Question 120. 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:

Shruti Srivastva

-Answered by Shruti Srivastva On 23 May 2020:06:58:02 PM

Question 121. 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:

Shruti Srivastva

DNA and protein.

-Answered by Shruti Srivastva On 23 May 2020:06:56:07 PM

Question 122. Asked on :23 May 2020:06:52:32 PM

What is the function of DNA?

-Added by Shruti Srivastva Science » DNA

What is Electric Current?

-Added by Akki chauhan Science » Electricity

Answer:

priyanshu kumar
The rate of flow of charge of electron is called Electric current

-Answered by priyanshu kumar On 17 February 2020:02:50:22 PM

Question 147. Asked on :07 February 2020:09:40:02 AM

What is full form ADP?

-Added by Akki chauhan Science » Life Process.

Answer:

priyanshu kumar
Adenosine Dri Phosphate.

-Answered by priyanshu kumar On 17 February 2020:02:50:33 PM

Question 148. Asked on :07 February 2020:09:39:20 AM

What is full form o ATP?

-Added by Akki chauhan Science » Life Process

Answer:

Akki chauhan
Adenosine Tri phosphate.

-Answered by Akki chauhan On 07 February 2020:09:42:12 AM

Question 149. Asked on :07 February 2020:09:36:26 AM

What is full form of DNA?

-Added by Akki chauhan Science » Life Process

Answer:

priyanshu kumar
Deoxyribo Nucleic Acid.

-Answered by priyanshu kumar On 17 February 2020:02:51:05 PM

Question 150. Asked on :03 February 2020:06:43:20 PM

Why respiration considered as Exothermic reaction?

-Added by Akki chauhan Science » Chemistry

Question 151. Asked on :03 February 2020:06:42:38 PM

Why we store silver chloride in dark bottles?

-Added by Akki chauhan Science » Chemistry

Answer:

priyanshu kumar
Silver chloride is stored in dark coloured bottles because it reacts with sunlight and decomposes to form silver and chlorine gas. So to prevent this it is stored in dark coloured bottles. the type of reaction is photolytic decomposition reaction.

-Answered by priyanshu kumar On 17 February 2020:02:51:34 PM

Question 152. Asked on :03 February 2020:06:41:54 PM

Write chemical equation of decomposition reaction?

-Added by Akki chauhan Science » Chemistry

Answer:

priyanshu kumar
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen

-Answered by priyanshu kumar On 17 February 2020:02:51:43 PM

Question 153. Asked on :03 February 2020:06:41:04 PM

What happens when quick lime is added to water?

-Added by Akki chauhan Science » Chemistry

Answer:

priyanshu kumar
When Calcium oxide i.e. quick lime is added to water filled in a bucket, it reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of he

-Answered by priyanshu kumar On 17 February 2020:02:51:53 PM

Question 154. 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:

priyanshu kumar
Stretch the thumb, Fore inger and middle inger of your left hand such that they are perpendicular to each other. If fore finger indicates the magnetic field and middle inger indiactes the direction of current and thumb indicates direction of force or motion.

-Answered by priyanshu kumar On 17 February 2020:02:52:41 PM

Question 155. Asked on :31 January 2020:07:14:21 PM

Name excretory organ in amoeba and earthworm?

-Added by Himanshi Verma Science » Life Processes

Answer:

priyanshu kumar

Amoeba- cell memebrane

Earthworm- outer covering (skin

-Answered by priyanshu kumar On 17 February 2020:02:53:17 PM

Question 156. Asked on :31 January 2020:07:13:07 PM

Woody plants carry gaseous exchange through?

-Added by Himanshi Verma Science » Life Processes

Answer:

priyanshu kumar

Lenticles.

-Answered by priyanshu kumar On 17 February 2020:02:53:29 PM

Question 157. Asked on :31 January 2020:07:10:26 PM

What is dialysis?

-Added by Himanshi Verma Science » Life Processes

What are the different ways by which speciation takes place?

-Added by Himanshi Verma Science » Heredity And Evolution

Answer:

A??k Pal

1. Gene flow: occurs between population that are partly but not completely separated.

-Added by Aman Senapati Science » Light

Answer:

Rohit Rajput

There are two laws of refection:-

-Added by Aman Senapati Science » Star And Solar System

Answer:

Rohit Rajput

The clusters of stars in the constellation are called globular clusters.

-Answered by Rohit Rajput On 29 December 2019:10:20:13 AM

Question 192. 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:

Rohit Rajput
Pluto.

-Answered by Rohit Rajput On 29 December 2019:10:20:30 AM

Question 193. Asked on :15 December 2019:10:23:03 AM

Which star appears stationary?

-Added by Aman Senapati Science » Star And Solar System

Answer:

Rohit Rajput

Pole star.

-Answered by Rohit Rajput On 29 December 2019:10:20:53 AM

Question 194. Asked on :15 December 2019:10:21:39 AM

-Added by Aman Senapati Science » Sound

Answer:

priyanshu kumar

Wind Instrument

Stringed Instrument

Percussion instruments

-Answered by priyanshu kumar On 11 December 2019:08:23:41 AM

Question 214. 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:

Suraj Kumar

Light Emitting Diode.

-Answered by Suraj Kumar On 11 December 2019:08:28:08 AM

-Added by Aman Senapati Science » Friction

Answer:

Suraj Kumar

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 219. Asked on :10 December 2019:05:50:38 PM

Define Electrode?

-Added by Aman Senapati Science » Chemical Effect Of Electric Current

Answer:

Suraj Kumar

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 220. Asked on :21 November 2019:09:07:23 AM

suggest three measure to protected ourselves lighting?

-Added by Sohail alam Science » Our Body

Answer:

Sohail alam
Three measures to stay protected from lightning are: (i) Stay indore or under covered area. (ii) Don't take bath during lightning. Avoid any contact with running water.

-Answered by Sohail alam On 21 November 2019:09:09:20 AM

Question 221. Asked on :21 November 2019:09:04:45 AM

-Added by Suman Kumari Science » Science

Answer:

Suman Kumari
Breathing is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.

-Answered by Suman Kumari On 15 November 2019:03:11:23 PM

Question 228. Asked on :15 November 2019:03:02:35 PM

What product the chest cavity?

-Added by Suman Kumari Science » Science

Answer:

Suraj Kumar

This cavity is surrounded by ribs on the side rib cage.

-Answered by Suraj Kumar On 21 November 2019:08:40:21 AM

Question 229. Asked on :15 November 2019:02:58:58 PM

Where lungs are situated ?

-Added by Suman Kumari Science » Science

Answer:

Suraj Kumar

Lungs are situated in chest cavity.

-Answered by Suraj Kumar On 21 November 2019:08:40:29 AM

Question 230. Asked on :09 November 2019:06:43:47 PM

What are the limitations of Dobereiner's Triads?

-Added by Akki chauhan Science » Periodic Classification Of Elements

-Added by Suman Kumari Science » Science

Answer:

Suraj Kumar
Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. The term vibration is precisely used to describe mechanical oscillation.

-Answered by Suraj Kumar On 09 November 2019:08:46:00 AM

Question 241. 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:

Suraj Kumar

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 242. 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:

Rohit Rajput

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 243. Asked on :08 November 2019:03:23:35 PM

How is menarche different from menopause?

-Added by Nishant Verma Science » Gk

Answer:

Suraj Kumar

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 244. Asked on :08 November 2019:03:23:24 PM

Write the molecular formula of first two members of homologous series having functional group – OH.

-Added by Nishant Verma Science » Gk

Answer:

Suraj Kumar

-Added by Nishant Verma Science » Gk

Answer:

Akki chauhan

11258

-Answered by Akki chauhan On 09 November 2019:06:48:31 PM

Question 261. Asked on :08 November 2019:03:13:50 PM

Which two state assemblies came together for a special assembly session on November 6?

-Added by Nishant Verma Science » Gk

Answer:

Akki chauhan
Vishwanath Tripathi

-Answered by Akki chauhan On 09 November 2019:06:48:46 PM

Question 262. 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:

Akki chauhan
Sheikh Khalifa

-Answered by Akki chauhan On 09 November 2019:06:48:54 PM

Question 263. Asked on :08 November 2019:02:55:45 PM

Write the features which formed the basis for grouping the organisms into five kingdoms.

-Added by Nishant Verma Science » Gk

Answer:

Akki chauhan

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 264. Asked on :08 November 2019:02:55:33 PM

In which two categories, the organisms are divided on the basis of evolution? How are the two categories different from each other?

-Added by Nishant Verma Science » Gk

Answer:

Akki chauhan
On the basis of evolution, the organisms are divided into two categories :
(a) ‘Primitive’ or ‘lower’ organisms
(b) ‘Advanced’ or ‘higher’ organisms
Advanced organisms are the result of gradual development of more complex organisms from the simpler ones i.e., primitive organisms.

-Answered by Akki chauhan On 09 November 2019:06:49:10 PM

Question 265. Asked on :08 November 2019:02:55:22 PM

-Added by Nishant Verma Science » G.k

Answer:

Akki chauhan
Two conditions that are essential for good health are:
(i) Proper nutrition and a blanced diet
(ii) Good Social environment.

-Answered by Akki chauhan On 09 November 2019:06:39:36 PM

Question 269. Asked on :08 November 2019:02:54:29 PM

Name any two sexually transmitted diseases.

-Added by Nishant Verma Science » Gk

Answer:

Akki chauhan

Types of Sexually Transmitted Infections

Human Immunodeficiency Virus (HIV) and Acquired Immune Deficiency Syndrome (AIDS) ...
Chlamydia. ...
Gonorrhea. ...
Pelvic Inflammatory Disease (PID) ...
Genital Warts and Human Papillomavirus (HPV) ...
Genital Herpes (HSV-1, HSV-2) ...
Syphilis. ...
Symptoms That Suggest Sexually Transmitted Infections May

-Answered by Akki chauhan On 09 November 2019:06:39:46 PM

Question 270. Asked on :08 November 2019:02:54:10 PM

What are the two ways to treat an infectious disease?

-Added by Nishant Verma Science » Gk

Answer:

-Added by Nishant Verma Science » Current Gk

Answer:

Nishant Verma

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 277. Asked on :08 November 2019:02:50:26 PM

What do you mean by intensive and extensive properties of matter?

-Added by Nishant Verma Science » Current Gk

Answer:

Nishant Verma

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 278. 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:

Nishant Verma

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 279. 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:

Nishant Verma
Sikkim.

-Answered by Nishant Verma On 07 November 2019:02:57:40 PM

Question 280. Asked on :06 November 2019:03:20:18 PM

What is aerobic respiration?

-Added by Suman Kumari Science » Science

Answer:

Nishant Verma
Living things need energy for everything they do, including growing and reproducing. This energy comes from glucose. All animals and humans get glucose through eating it, but plants need to make their own glucose during photosynthesis.

-Answered by Nishant Verma On 07 November 2019:02:57:50 PM

Question 281. Asked on :06 November 2019:03:17:41 PM

-Added by Himanshi Verma Science » Light

Answer:

priyanshu kumar

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 289. Asked on :31 October 2019:07:24:40 PM

Write the causes presbyopia?

-Added by Himanshi Verma Science » Light And Reflection

Answer:

Rohit Rajput

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 290. Asked on :31 October 2019:07:15:23 PM

Write the causes of Myopia?

-Added by Himanshi Verma Science » Light

Answer:

Suraj Kumar

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 291. 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:

Rohit Rajput

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 292. Asked on :31 October 2019:06:57:27 PM

Write two laws of reflection?

-Added by Himanshi Verma Science » Light Reflection And Refraction

Answer:

priyanshu kumar
1.The angle of incidence is equal to the angle of reflection.

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 293. Asked on :29 October 2019:03:16:06 PM

-Added by Nitu 123 Pawer Science » Science

Answer:

priyanshu kumar
What happens when a chemical bond is formed?

-Answered by priyanshu kumar On 01 November 2019:10:31:03 AM

Question 300. Asked on :28 October 2019:03:20:20 PM

The mass of a star is two times the mass of the sun . how will it come to an end?

-Added by Nitu 123 Pawer Science » Physics

What is the reaction of acid?

-Added by Nitu 123 Pawer Science » Acid Base Salt

Answer:

Nishant Verma

When an acid reacts with metal, a salt and hydrogen are produced: acid + metal → salt + hydrogen An example: nitric acid + calcium → calcium nitrate + hydrogen The salt that is produced depends upon which acid and which metal react.

-Answered by Nishant Verma On 01 November 2019:03:27:28 PM

Question 307. Asked on :25 October 2019:03:18:51 PM

What acid is present in ant bite?

-Added by Suman Kumari Science » Science Questions

Answer:

Nishant Verma
The acid produced by ants is called formic acid. The name comes from the Latin word for ant, which is “formica.” Chemically, it is a simple carboxylic acid. The most common species of black ant in the United States is the black carpenter ant, which delivers a small amount of formic acid through its jaws as it bites.

-Answered by Nishant Verma On 26 October 2019:03:16:46 PM

Question 308. Asked on :25 October 2019:03:14:37 PM

What is neutralisation?

-Added by Suman Kumari Science » Science

Answer:

Nishant Verma
The reaction of an acid and a base is called neutralisation.

-Answered by Nishant Verma On 26 October 2019:03:16:57 PM

Question 309. 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:

priyanshu kumar

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 310. Asked on :23 October 2019:03:00:37 PM

-Added by Himanshi Verma Science » The Human Eye And The Colourful World

Answer:

-Added by Suman Kumari Science » Science

Answer:

priyanshu kumar
Hemoglobin is a protein found in red blood cells. It gives blood its red color, and its job is to carry oxygen throughout your body.

-Answered by priyanshu kumar On 20 October 2019:09:07:38 AM

Question 320. Asked on :18 October 2019:03:16:44 PM

Name the types of litmus paper?

-Added by Suman Kumari Science » Science Questions

Answer:

priyanshu kumar

Purple/ Neutral Litmus Paper

A purple or neutral litmus paper changes color, from its original violet to red, to indicate an acid and turns blue under alkaline (or basic) conditions.

-Answered by priyanshu kumar On 20 October 2019:09:12:48 AM

Question 321. Asked on :18 October 2019:03:12:39 PM

What is fabric?

-Added by Suman Kumari Science » Science

Answer:

priyanshu kumar
Three types of fabric:

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 322. Asked on :16 October 2019:08:05:42 PM

Fresh milk has a pH of 6. How does the pH will change as it turns to curd? Explain your answer.

-Added by Himanshi Verma Science » Acid Base And Salt

Answer:

priyanshu kumar

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 323. 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:

priyanshu kumar

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 324. 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:

Nishant Verma

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 325. 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:

priyanshu kumar

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 326. 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:

Nishant Verma

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 327. 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:

priyanshu kumar

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 328. 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:

priyanshu kumar

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 329. 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:

priyanshu kumar

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 330. 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:

priyanshu kumar

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 331. Asked on :16 October 2019:07:51:14 PM

Explain AC generator with the help of diagram.

-Added by Himanshi Verma Science » Electricity

Answer:

priyanshu kumar

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 332. 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:

priyanshu kumar

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 333. 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:

Rohit Rajput

Stomach

-Answered by Rohit Rajput On 24 October 2019:09:55:18 AM

Question 334. Asked on :12 October 2019:12:21:56 PM

Name the corona virus that kills human?

-Added by Himanshi Verma Science » G.k

Answer:

priyanshu kumar

SARS

-Answered by priyanshu kumar On 12 October 2019:03:08:48 PM

Question 335. 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:

Rohit Rajput
Vitamin A

-Answered by Rohit Rajput On 24 October 2019:09:55:35 AM

Question 336. Asked on :12 October 2019:12:19:56 PM

Greatest number of Sweat glands are present in which part of the human body?

-Added by Himanshi Verma Science » G.k

Answer:

Rohit Rajput

Plam of hand

-Answered by Rohit Rajput On 24 October 2019:09:55:48 AM

Question 337. 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:

Rohit Rajput
Liver produces a digestive fluid known as bile. Liver releases Bile into Gall Bladder, a small, pear-shaped organ located just below your liver in the upper right side of your abdomen

-Answered by Rohit Rajput On 24 October 2019:09:55:57 AM

Question 338. Asked on :12 October 2019:12:18:50 PM

Which blood vessels have the smallest diameter?

-Added by Himanshi Verma Science » G.k

Answer:

Rohit Rajput
Blood is carried through the body by Blood Vessels. With the help of perfusion process capillaries supplies blood to the tissues. The diameter of capillary ranges from 5-10 micrometers. The diameter of arteriole is approx. 30 micrometer

-Answered by Rohit Rajput On 24 October 2019:09:56:14 AM

Question 339. Asked on :12 October 2019:12:17:22 PM

Fungi are plants that lack:

-Added by Himanshi Verma Science » G.k

Answer:

priyanshu kumar
We know plants prepare their own food and so are known as autotrophs. With the help of photosynthesis they make food in which they produce glucose from carbon dioxide and sunlight. Also, oxygen is released by plants which is further used by humans and other animals. But Fungi lack chlorophyll and do not engage in photosynthesis.

-Answered by priyanshu kumar On 12 October 2019:03:12:03 PM

Question 340. Asked on :12 October 2019:11:23:40 AM

Give a reason to explain why adrenaline helps in dealing emergency situations?

-Added by Himanshi Verma Science » Control And Coordination

Answer:

Master Purushottam

Increases the supply of oxygen and glucose to muscles and brain.
Increases the heart rate and the amount of blood pumped by heart per beat.
Dilates the air passages and constricts the blood vessels.

-Answered by Master Purushottam On 13 October 2019:02:26:07 PM

Question 341. Asked on :12 October 2019:11:21:19 AM

What is the important function of presence of ozone in earth’s atmosphere?

-Added by Himanshi Verma Science » G.k

Answer:

Master Purushottam

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 342. 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:

Master Purushottam

-Answered by Master Purushottam On 13 October 2019:02:26:50 PM

Question 343. 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:

priyanshu kumar

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 344. 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:

Nishant Verma

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 345. Asked on :10 October 2019:07:59:38 PM

-Added by Himanshi Verma Science » G.K.

Answer:

Rohit Rajput
Sulphur

-Answered by Rohit Rajput On 24 October 2019:09:58:33 AM

Question 350. Asked on :10 October 2019:07:56:54 PM

What is the other name of thiamine?

-Added by Himanshi Verma Science » G.k

Answer:

Rohit Rajput

Vitamin B1

-Answered by Rohit Rajput On 24 October 2019:09:58:40 AM

Question 351. Asked on :10 October 2019:07:55:48 PM

Which Vitamin is also known as retinol?

-Added by Himanshi Verma Science » G.k

How many types of mirror?

-Added by Aarohi Chauhan Science » Light Reflection And Refraction

Answer:

Akki chauhan

1. concave

2. convex

-Answered by Akki chauhan On 11 October 2019:10:40:44 AM

Question 366. 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

-Added by Himanshi Verma Science » G.k

Answer:

Akki chauhan

Dmitri Mendeleev

-Answered by Akki chauhan On 11 October 2019:10:43:49 AM

Question 373. Asked on :10 October 2019:07:37:03 PM

Who is honored as Father of Modern Chemistry?

-Added by Himanshi Verma Science » G.k

Answer:

priyanshu kumar
Antoine Lavoisier

-Answered by priyanshu kumar On 12 October 2019:04:06:48 PM

Question 374. 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:

priyanshu kumar
Steroid hormone is produced by three endocrine organs. The testes, produces testosterone; the ovaries, produces estrogen; and the adrenal cortex, produces steroid hormones such as cortisol and aldosterone. Steroid hormones are derived from cholesterol and are lipid-soluble molecules.

-Answered by priyanshu kumar On 12 October 2019:04:07:13 PM

Question 375. 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:

priyanshu kumar
Liver produces a digestive fluid known as bile. Liver releases Bile into Gall Bladder, a small, pear-shaped organ located just below your liver in the upper right side of your abdomen.

-Answered by priyanshu kumar On 12 October 2019:04:07:22 PM

Question 376. Asked on :10 October 2019:07:31:40 PM

What is low of reflection?

-Added by Aarohi Chauhan Science » Light Reflection And Refraction

Answer:

priyanshu kumar
1. the angle of incidence is equal to the angle of reflection .

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 377. 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:

priyanshu kumar
The yellow powder is called pollen and the stick that holds it is known as stamen.

-Answered by priyanshu kumar On 12 October 2019:04:08:05 PM

Question 378. Asked on :10 October 2019:07:31:33 PM

Which blood vessels have the smaller diameter?

-Added by Himanshi Verma Science » Life Processes

Answer:

priyanshu kumar
Blood is carried through the body by Blood Vessels. With the help of perfusion process capillaries supplies blood to the tissues. The diameter of capillary ranges from 5-10 micrometers. The diameter of arteriole is approx. 30 micrometer.

-Answered by priyanshu kumar On 12 October 2019:04:08:15 PM

Question 379. Asked on :10 October 2019:07:28:05 PM

What is reflection of light?

-Added by Aarohi Chauhan Science » Light Reflection And Refraction

-Added by Himanshi Verma Science » G.k

Answer:

priyanshu kumar
Vitamin A.

-Answered by priyanshu kumar On 12 October 2019:04:10:04 PM

Question 386. Asked on :10 October 2019:07:14:45 PM

What is the refraction?

-Added by Aarohi Chauhan Science » Light Reflection And Refraction

Answer:

priyanshu kumar

the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.

change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.
measurement of the focusing characteristics of an eye or eyes.

-Answered by priyanshu kumar On 12 October 2019:04:10:15 PM

Question 387. Asked on :10 October 2019:07:12:26 PM

How many HIV positive infections that are occurring everyday in the world?

-Added by Himanshi Verma Science » Our Environment

Answer:

priyanshu kumar

Number of People with HIV—There were approximately 37.9 million people across the globe with HIV/AIDS in 2018. Of these, 36.2 million were adults and 1.7 million were children (<15 years old). New HIV Infections—An estimated 1.7 million individuals worldwide became newly infected with HIV in 2018.Jul 31, 2019

Type of infectious agent: Virus

-Answered by priyanshu kumar On 12 October 2019:04:10:51 PM

Question 388. Asked on :10 October 2019:07:10:45 PM

What is light ?

-Added by Aarohi Chauhan Science » Light Reflection And Refraction

Answer:

priyanshu kumar
Light is electromagnetic radiation that shows properties of both waves and particles. Light exists in tiny energy packets called photons. ... In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not

-Answered by priyanshu kumar On 12 October 2019:04:10:41 PM

Question 389. Asked on :10 October 2019:06:51:47 PM

-Added by Himanshi Verma Science » Magnetic Effects Of Electric Current

Answer:

Rahul Kumar

1) It is used in cranes for lifting heavy loads.

2) It is used in electric bells.

-Answered by Rahul Kumar On 10 October 2019:03:13:43 PM

Question 394. Asked on :09 October 2019:07:46:18 PM

Give two uses of electric current.

-Added by Himanshi Verma Science » Magnetic Effects Of Electric Current

Answer:

Rohit Rajput

It mostly used in low voltage applications such as charging batteries, aircraft applications, etc. Alternating current is used to operate appliances for both household and industrial and commercial use. The electric current is measured in ampere.

-Answered by Rohit Rajput On 11 October 2019:08:19:31 PM

Question 395. Asked on :09 October 2019:07:38:09 PM

State three factors on which magnetic field produced by a current carrying solenoid depends.

-Added by Rohit Rajput Science » Magnetic Effects Of Electric Current

Answer:

Akki chauhan

-Added by Master Purushottam Science » Gk

Answer:

priyanshu kumar

Lead

-Answered by priyanshu kumar On 09 October 2019:11:02:26 AM

Question 412. Asked on :08 October 2019:11:54:20 AM

Which gas evolved from paddy fields and marshes?

-Added by Master Purushottam Science » Gk

Answer:

priyanshu kumar
Methane

-Answered by priyanshu kumar On 09 October 2019:11:02:36 AM

Question 413. Asked on :08 October 2019:11:54:05 AM

Which is the most abundant gas in the earth's atmosphere?

-Added by Master Purushottam Science » Gk

Answer:

priyanshu kumar
Nitrogen (78.08%)

-Answered by priyanshu kumar On 09 October 2019:11:02:52 AM

Question 414. Asked on :08 October 2019:11:53:49 AM

-Added by Himanshi Verma Science » Our Environment

Answer:

Himanshi Verma

-Answered by Himanshi Verma On 08 October 2019:11:40:16 AM

Question 418. Asked on :08 October 2019:11:36:10 AM

What is trophic level?

-Added by Himanshi Verma Science » Our Environment

Answer:

Himanshi Verma

Various levels or steps in a food chain in which transfer of food takes place from one organism to another are called trophic level.

-Answered by Himanshi Verma On 08 October 2019:11:37:13 AM

Question 419. Asked on :08 October 2019:11:34:05 AM

Name the main source of energy in self sustaining ecosystem?

-Added by Himanshi Verma Science » Our Environment

Answer:

Himanshi Verma

Sun.

-Answered by Himanshi Verma On 08 October 2019:11:35:59 AM

Question 420. Asked on :08 October 2019:11:32:02 AM

-Added by Himanshi Verma Science » Sources Of Energy

Answer:

Rohit Rajput
Advantages of solar cooker:

1) There is no cost of fuel.

2) It is environment friendly and there is no residue like ash etc.

3) Cooking is hygienic and nutritious.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

Electrical conductivity of a metal is decreased when it is alloyed with another metal or non- metal. Thus, the electrical conductivity of a steel is much less than that of pure that is why copper is used to make hot water tanks and not steel.

-Answered by Rohit Rajput On 11 October 2019:08:24:42 PM

Question 435. Asked on :08 October 2019:10:56:09 AM

Name the metal which reacts with cold water.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

Sodium reacts with cold water.

-Answered by Rohit Rajput On 11 October 2019:08:24:51 PM

Question 436. Asked on :07 October 2019:06:26:02 PM

Who had performed the world’s first heart transplant?

-Added by Master Purushottam Science » Gk

-Added by Master Purushottam Science » Gk

Answer:

Master Purushottam
Phagocytosis.

-Answered by Master Purushottam On 07 October 2019:08:34:28 PM

Question 451. Asked on :07 October 2019:06:23:34 PM

Which is the largest human cell?

-Added by Master Purushottam Science » Gk

Answer:

Rohit Rajput

egg cell

-Answered by Rohit Rajput On 24 October 2019:10:12:27 AM

Question 452. Asked on :07 October 2019:06:23:25 PM

The largest cell is ________________

-Added by Master Purushottam Science » Gk

Answer:

Rohit Rajput

Nucleus

-Answered by Rohit Rajput On 24 October 2019:10:12:43 AM

Question 453. Asked on :07 October 2019:06:23:13 PM

Question 479. Asked on :07 October 2019:02:12:50 PM

The satellite of Ecuador which was damaged on collision with Russian debris in space?

-Added by Nishant Verma Science » Science

Answer:

Master Purushottam
Pegasus. This is the first only satellite.

-Answered by Master Purushottam On 07 October 2019:08:57:51 PM

Question 480. Asked on :07 October 2019:02:10:17 PM

Anemometer is an instrument used for measuring?

-Added by Nishant Verma Science » Science

Answer:

Rohit Rajput
Wind Speed

-Answered by Rohit Rajput On 24 October 2019:10:27:38 AM

Question 481. Asked on :07 October 2019:02:09:12 PM

The device used for detecting even feeble current:

-Added by Nishant Verma Science » Science

Answer:

Rohit Rajput
Galvanoscope

-Answered by Rohit Rajput On 24 October 2019:10:27:49 AM

Question 482. Asked on :07 October 2019:02:08:18 PM

Which is the alkalodid that contains in coal drinks?

-Added by Nishant Verma Science » Science

Answer:

Master Purushottam
Caffeine

-Answered by Master Purushottam On 07 October 2019:08:58:10 PM

Question 483. Asked on :07 October 2019:02:07:27 PM

Most of the light rays inside a tube-light is in the form of

-Added by Nishant Verma Science » Science

-Added by Himanshi Verma Science » Is Matter Around Us Pure

Answer:

priyanshu kumar

1) Particles of matter have spaces between them .

2) Particles of matter are continuously moving.

3) Particles of matter attract each other.

-Answered by priyanshu kumar On 05 October 2019:01:06:17 PM

Question 526. Asked on :05 October 2019:11:12:46 AM

What is evaporation?

-Added by Himanshi Verma Science » Is Matter Around Us Pure

Answer:

priyanshu kumar
The phenomenon of change of a liquid into vapours at any temprature below its melting point is called evaporation.

-Answered by priyanshu kumar On 05 October 2019:01:06:50 PM

Question 527. Asked on :05 October 2019:10:58:45 AM

What is Suberin?

-Added by Himanshi Verma Science » Tissues

Answer:

priyanshu kumar
It is chemical substance which is found in the outer protective layer or the skin of the plants. It make proofful for the air and water for the air and water for the skin of the plants.

-Answered by priyanshu kumar On 05 October 2019:01:08:22 PM

Question 528. Asked on :05 October 2019:11:00:40 AM

Write the features of Xylem tissue?

-Added by Himanshi Verma Science » Tissues

Answer:

priyanshu kumar

1) The cell Xylem Parenchyma is only live cells and many of them are dead cells.

2) Tracheids and vessels are tubular structure.

3) This allows them to transport water and minerals.

4) The parenchyma stores food and helps in sideways conduction of water.

5) Fibres are mainly supportive in function.

-Answered by priyanshu kumar On 05 October 2019:01:09:33 PM

Question 529. Asked on :05 October 2019:10:57:04 AM

What is permanent tissue?

-Added by Himanshi Verma Science » Tissues

Answer:

priyanshu kumar
The cell which are differentiated to perform specific and loose the ability to divide is called permanent tissue.

-Answered by priyanshu kumar On 05 October 2019:01:10:35 PM

Question 530. Asked on :05 October 2019:10:47:10 AM

Write the features of Parenchyma Tissue.

-Added by Himanshi Verma Science » Tissues

Answer:

priyanshu kumar

1)It consists of relatively on specialized cells with thin cell wall.

2) These are live cells.

3) They are usually loosly packed.

4) There are large space between them.

-Answered by priyanshu kumar On 05 October 2019:01:11:12 PM

Question 531. Asked on :05 October 2019:10:39:04 AM

Write the First Law of motion.

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

Answer:

Nishant Verma

An object will be in rest or in motion until unbalanced force applied on it.

An object continues to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force.

-Answered by Nishant Verma On 06 October 2019:09:09:08 AM

Question 532. Asked on :05 October 2019:10:37:04 AM

What is advanced or higher organism?

-Added by Himanshi Verma Science » Diversity In Living Organisms

Answer:

priyanshu kumar
Some substantial changes in the physical structures of the organism groups are visible. They are called advanced organism. Ex- Human

-Answered by priyanshu kumar On 05 October 2019:01:12:36 PM

Question 533. Asked on :05 October 2019:10:33:51 AM

What is primitive organism?

-Added by Himanshi Verma Science » Diversity In Living Organisms

Answer:

Nishant Verma
The physical structure of some organism groups since ancient times there has been no significant change. Such organism are called primitive organism. Ex- All insects, crocodile.

-Answered by Nishant Verma On 06 October 2019:09:10:10 AM

Question 534. Asked on :05 October 2019:10:29:56 AM

Write the benefits of the classification.

-Added by Himanshi Verma Science » Diversity In Living Organisms

Answer:

priyanshu kumar

1) It makes easy the biological study of organism.

2) It also makes easy to understand the particular characterstics of organism.

-Added by Himanshi Verma Science » Chapter 13 Sound

Answer:

priyanshu kumar

1) The direction in which the sound is incident and the reflected make equal angles.

2) The angle of incidence, angle of reflection and the normal to the reflecting surface are in the same plane.

-Answered by priyanshu kumar On 05 October 2019:03:27:30 PM

Question 541. Asked on :05 October 2019:10:08:44 AM

What are the methods to reduce Reverberation?

-Added by Himanshi Verma Science » Sound

Answer:

priyanshu kumar

1) The curtains are suspended in the buildings to reduce it so that the sound can be absorbed.

2) By increasing the presence of listeners in the rooms or auditoriums, the sound is absorbed by it as well.

3) To reduce it, compressed fiber board, rough plaster etc. are applied.

4) The right choice of seat's materials in the seats also act a sound absorbers.

-Answered by priyanshu kumar On 05 October 2019:03:28:22 PM

Question 542. Asked on :05 October 2019:10:03:17 AM

Write the applications of Ultrasound.

-Added by Himanshi Verma Science » Chapter 13 Sound

Answer:

priyanshu kumar

1) Ultrasound is generally used to clean parts located in hard to reach places. For example Spiral tube, odd shaped parts electronic components etc.

2) Ultrasound can be used to detect cracks and flaws in metal blocks.

3) Ultrasound is used in the medical field to detect illness diseases.

4) Ultrasound is used in a device named SONAR which is used to measure the depth of ocean in the ships.

5) Ultrasound are used extensively in industries and for medical purpose.

6) Ultrasound are highly frequency waves.

-Answered by priyanshu kumar On 05 October 2019:03:33:18 PM

Question 543. Asked on :05 October 2019:10:01:15 AM

What is acid rain?

-Added by Himanshi Verma Science » Natural Resources

Answer:

priyanshu kumar
Nitrogen oxide and sulphur oxide are produced due to combustion of fossil fuels They dissolve in air to give rise to acid rain.

-Answered by priyanshu kumar On 05 October 2019:03:33:27 PM

Question 544. Asked on :05 October 2019:09:56:49 AM

Why do we need water?

-Added by Himanshi Verma Science » Natural Resources

Answer:

Nishant Verma

1) All cellular processes take place in a water medium.

2) All the reaction that take place within our body and within the cells occur between substance that are dissolved in water.

3) Substances are also transported from one part of the body to the other in a dissolved form.

4) Organism need to maintain the level of wter within their bodies in order toi stay alive.

-Answered by Nishant Verma On 06 October 2019:09:11:48 AM

Question 545. Asked on :05 October 2019:09:55:19 AM

-Added by Himanshi Verma Science » Natural Resources

Answer:

Nishant Verma
The atmospher can be heated from below by the radiation that is reflected back or re- radiated by the land or water bodies On being heated convention currents are set up in the air.

-Answered by Nishant Verma On 06 October 2019:09:14:42 AM

Question 549. Asked on :05 October 2019:09:45:17 AM

Why sound wave is also called mechanical wave?

-Added by Himanshi Verma Science » Sound

Answer:

Nishant Verma

Sound wave need a medium to propagate from one place to another in otherhand it need body for transmission, this is then reason that sound waves are also called mechanical wave.

-Answered by Nishant Verma On 06 October 2019:09:15:47 AM

Question 550. Asked on :05 October 2019:09:41:51 AM

How does the atmosphere act as a blanket?

-Added by Himanshi Verma Science » Natural Resources

Answer:

Nishant Verma
The air is a bad conductor of temprature. It keeps constant the average of temprature of the earth during the day and the whole year. It regulates the raising day temprature. Thus, The atmosphere act as a blanket.

-Answered by Nishant Verma On 06 October 2019:09:17:00 AM

Question 551. Asked on :05 October 2019:09:39:20 AM

Describe that processes or factors which helpful in soil formation.

-Added by Himanshi Verma Science » Natural Resources

Answer:

Nishant Verma

The sun= Rocks expand on sun's heat during day and contract at night, this results in the formation of cracks on the surface of rocks causing breaking up into smaller pieces.

-Answered by Nishant Verma On 06 October 2019:09:17:18 AM

Question 552. Asked on :05 October 2019:09:37:16 AM

How is Lichen helpful in soil formation?

-Added by Himanshi Verma Science » Natural Resources

Answer:

Nishant Verma
Lichen grows on the surface of stones. In this order they release a substance which make the surface of stone like powder and form a thin layer.

-Answered by Nishant Verma On 06 October 2019:09:17:33 AM

Question 553. Asked on :04 October 2019:06:10:04 PM

What is fuel

-Added by Shruti Srivastva Science » Science

Answer:

Nishant Verma
A fuel is any material that can be made to react with other substance so that it releases energy as heat energy or to be used for work.

-Answered by Nishant Verma On 06 October 2019:09:17:46 AM

Question 554. Asked on :04 October 2019:06:09:21 PM

What is combustion

-Added by Shruti Srivastva Science » Science

Answer:

Nishant Verma
Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmosphere oxygen, that produce oxidized, often gaseous product in a mixture termed as smoke. Combustion in a fire produces a flame, and the heat produced can make combustion self-sustaining.

-Answered by Nishant Verma On 06 October 2019:09:17:59 AM

Question 555. Asked on :04 October 2019:05:57:27 PM

-Added by Aarohi Chauhan Science » Resources Of Engry

Answer:

Rohit Rajput
Fossil

-Answered by Rohit Rajput On 13 October 2019:11:22:41 AM

Question 559. Asked on :03 October 2019:07:35:30 PM

The strenth of magnetic field inside a long current carrying straight solenoid is ?

-Added by Aarohi Chauhan Science » Magnetic Effects Of Electric Current

Answer:

Nishant Verma
Same at all place.

-Answered by Nishant Verma On 06 October 2019:09:21:23 AM

Question 560. Asked on :03 October 2019:07:32:16 PM

In a food chain , the thied tropic level is always occupied by?

-Added by Aarohi Chauhan Science » FOOD CHAIN

Answer:

Nishant Verma
Carnivores

-Answered by Nishant Verma On 06 October 2019:09:21:36 AM

Question 561. Asked on :03 October 2019:07:29:10 PM

Sodium carbonate is a basic salt because it is a salt of?

-Added by Aarohi Chauhan Science » Chemicall Reaction

-Added by Himanshi Verma Science » Atoms And Molecules

Answer:

priyanshu kumar

1. All matter is made up of very tiny particles called atoms.

2. Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.

3. Atoms of a given element are identical in mass and chemical properties.

4. Atoms of different element have different masses and chemical properties.

5. The relative number and kinds of atoms are constant in a given compound.

6. Atoms combine in the ratio of small whole numbers to form compound.

-Answered by priyanshu kumar On 30 September 2019:11:15:45 AM

Question 573. Asked on :29 September 2019:10:39:31 AM

Write two laws of Chemical combination.

-Added by Himanshi Verma Science » Atoms And Molecules

Answer:

-Added by Himanshi Verma Science » Atoms And Molecules

-Added by Himanshi Verma Science » Physics

Answer:

-Added by Khushi Chauhan Science » Science

Answer:

priyanshu kumar

Are you sitting down for this? If not, take a seat. You might notice that you're not falling through the chair or floor. That's because the forces acting on you are balanced. A force is a push or a pull in a given direction. The force of gravity pulling you down against your chair is balanced by the force of the chair pushing up against you.

The forces acting on you as you sit in your chair are just one example of Newton's third law, which states that for every action force there is an equal and opposite reaction force. In fact, all forces come in pairs. No force exists in isolation. That's one of the fundamental symmetries of our universe.

-Answered by priyanshu kumar On 02 October 2019:01:22:54 PM

Question 601. Asked on :15 September 2019:12:17:06 PM

Write the ways of saving fossil fuels.

-Added by Himanshi Verma Science » Sources Of Energy

Answer:

priyanshu kumar

1. Walking short distances.

2. Where possible switch off unneccessary light

3. Use of efficient appliances.

4. Use of public transport

5. Repair of faulty water taps.

6. Promotion of solar energy.

-Answered by priyanshu kumar On 03 October 2019:12:05:20 PM

Question 602. Asked on :15 September 2019:12:14:09 PM

Describe briefly the three ways in which individual with a particular trait may increase in population.

-Added by Himanshi Verma Science » Environment

Answer:

priyanshu kumar

1. Variation helps in survival of individual

2. Sexual reproduction results in variation.

3. Adaptation and natural selection.

-Answered by priyanshu kumar On 03 October 2019:12:05:43 PM

Question 603. Asked on :15 September 2019:12:12:24 PM

Question 612. Asked on :11 September 2019:11:23:02 AM

Write the symbol of Phosporus.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar

P is the symbol of phosphorous

-Answered by priyanshu kumar On 03 October 2019:12:49:14 PM

Question 613. Asked on :11 September 2019:11:21:34 AM

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

priyanshu kumar
Li.

-Answered by priyanshu kumar On 03 October 2019:12:51:51 PM

Question 625. Asked on :11 September 2019:10:29:17 AM

Question 636. Asked on :10 September 2019:10:04:17 AM

What is the cause of dispersion of light?

-Added by Himanshi Verma Science » Light And Reflection

Answer:

priyanshu kumar
When white light passes through a glass prism, different constituent colours bends through different angles with respect to the incident ray and hence are seprated.

-Answered by priyanshu kumar On 03 October 2019:01:30:24 PM

Question 637. Asked on :10 September 2019:10:01:49 AM

What is dispersion of white light?

-Added by Himanshi Verma Science » Light And Reflection

Answer:

Akki chauhan
Splitting of white light into seven constituent colours by a prism is called dispersion of white light.

-Answered by Akki chauhan On 11 September 2019:11:37:24 AM

Question 638. Asked on :10 September 2019:09:58:23 AM

What is homologous series?

-Added by Himanshi Verma Science » Chemical Compoud

Answer:

priyanshu kumar
Homologous series is a series of organic compounds having same general formula, all members of the compounds show same chemical properties, with slight gradation in physical properties.

-Answered by priyanshu kumar On 03 October 2019:01:31:01 PM

Question 639. Asked on :10 September 2019:09:54:42 AM

Describe the briefly the three ways in which individual with a particular trait may increase in population?

-Added by Himanshi Verma Science » Control And Coordination

Answer:

Akki chauhan

1. Variation helps in survival of individuals

2. Sexual reproduction results in variation.

3. Adaptation and natural selection.

-Answered by Akki chauhan On 11 September 2019:11:37:44 AM

Question 640. Asked on :10 September 2019:09:51:37 AM

What is stomata? Give two functions of stomata.

Why are fossils considered important in the study of evolution?

-Added by Himanshi Verma Science » Sources Of Energy

Answer:

priyanshu kumar
fossil fuels provide evidence in favour of evolution evolutionary relationship by providing missing links.

-Answered by priyanshu kumar On 03 October 2019:01:34:27 PM

Question 647. Asked on :10 September 2019:09:28:56 AM

In the electrolysis of water, name the gas collected at anode and cathode?

-Added by Himanshi Verma Science » Acid Base Salt

Answer:

priyanshu kumar
In the electrolysis of water, the gas collected at cathode is hydrogen and the gas collected at anode is hydrogen.

-Answered by priyanshu kumar On 03 October 2019:01:34:38 PM

Question 648. Asked on :10 September 2019:09:26:24 AM

Why is there a need to harness non conventional sources of energy?

-Added by Himanshi Verma Science » Sources Of Energy

Answer:

-Answered by Rohit Rajput On 06 September 2019:08:21:42 PM

Question 654. Asked on :06 September 2019:07:55:02 PM

What is anodising?

-Added by Himanshi Verma Science » Metals And Nonmetal

Answer:

priyanshu kumar
Anodising is a process of forming a thick layer of aluminium. Aluminium develops a thin oxide layer when exposed to air.

-Answered by priyanshu kumar On 12 October 2019:04:26:00 PM

Question 655. Asked on :06 September 2019:07:53:25 PM

What is ores?.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar

The minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores.

-Answered by priyanshu kumar On 12 October 2019:04:26:31 PM

Question 656. Asked on :06 September 2019:07:51:54 PM

What is gangue?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
Ores mined from the earth are usually contaminated with large amount of impurities such as soil, sand etc are called gangue.

-Answered by priyanshu kumar On 12 October 2019:04:26:39 PM

Question 657. Asked on :06 September 2019:07:50:34 PM

What is minerals?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
The elements or compounds which occur naturally in the earth crust is called minerals.

-Answered by priyanshu kumar On 12 October 2019:04:26:54 PM

Question 658. Asked on :06 September 2019:07:47:14 PM

What is roasting?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is called roasting.

-Answered by priyanshu kumar On 06 October 2019:09:53:29 AM

Question 659. Asked on :06 September 2019:03:51:50 PM

The main use of petrol is________ .

-Added by Shruti Srivastva Science » Science

Answer:

What is petrochemicals?

-Added by Pragya🥰 Choudhary Science » Vlothes

Answer:

priyanshu kumar

Petrochemical

Petrochemicals are chemical products

derived from petroleum. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sources such as corn, palm fruit or sugar cane. The two most common petrochemical classes are olefins and aromatics.

-Answered by priyanshu kumar On 12 October 2019:04:34:36 PM

Question 664. Asked on :06 September 2019:03:43:24 PM

Give 4 uses of Coal tar.

-Added by Pragya🥰 Choudhary Science » Petroleum

Answer:

priyanshu kumar
Coal tar is used in medicated shampoo, soap and ointment. It demonstrates antifungal, anti-inflammatory, anti-itch, and antiparasitic properties. It may be applied topically as a treatment for dandruff and psoriasis, and to kill and repel head lice. It may be used in combination with ultraviolet light therapy

-Answered by priyanshu kumar On 12 October 2019:04:34:48 PM

Question 665. Asked on :06 September 2019:03:43:40 PM

Write one use of coal tar?

-Added by Shruti Srivastva Science » Science

Answer:

priyanshu kumar
Coal tar are used in starting material for various substance.

-Answered by priyanshu kumar On 12 October 2019:04:35:36 PM

Question 666. Asked on :06 September 2019:03:42:20 PM

Explain What is Global Warming ?

-Added by Pragya🥰 Choudhary Science » Global Warming

Answer:

Akki chauhan
Global warming refers to global averages, with the amount of warming varying by region. Since the pre-industrial period, global average land temperatures have increased almost twice as fast as global average temperatures.

-Answered by Akki chauhan On 06 September 2019:08:04:08 PM

Question 667. Asked on :06 September 2019:03:41:34 PM

How can we control or save petrol?

-Added by Pragya🥰 Choudhary Science » Petroleum

Answer:

Master Purushottam

15 Ways to Save Fuel

Avoid Long Idling. ...
Clean Out the Trunk and Eliminate Unnecessary Weight. ...
Keep Tires Inflated to the Correct Pressure. ...
Don't Buy Premium Fuel. ...
Encourage Drivers to Observe Posted Speed Limits. ...
Shop Around for Best Fuel Prices. ...
7. Make Drivers Energy Conscious. ...
Use Air Conditioning Sparingly.

-Answered by Master Purushottam On 06 September 2019:06:27:23 PM

Question 668. Asked on :06 September 2019:03:40:17 PM

Explain the process of formation of Petroleum.

-Added by Pragya🥰 Choudhary Science » Petroleum

Answer:

priyanshu kumar

Petroleum was formed from dead organisms that got buried in the sea millions of years ago. ... Lack of air, high temperature, and high pressure transformed these dead organisms into petroleum and natural gas.

-Answered by priyanshu kumar On 08 October 2019:09:12:44 AM

Question 669. Asked on :06 September 2019:03:39:21 PM

What is pressure?

-Added by Pragya🥰 Choudhary Science » Force And Pressure

Answer:

priyanshu kumar

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure is the pressure relative to the ambient pressure. Various units are used to express pressure.

-Answered by priyanshu kumar On 08 October 2019:09:19:47 AM

Question 670. Asked on :06 September 2019:03:37:18 PM

What precaution must be taken while taking Streptomycin?

-Added by Pragya🥰 Choudhary Science » Micro -organisms

Answer:

priyanshu kumar
1)We should not take dose of antibiotics. 2)Antibiotics should not be taken empty stomach. 3)We should complete the dose of antibiotic as advised by the doctor. 4)We should take antibiotic only after consulting a doctor.

-Answered by priyanshu kumar On 08 October 2019:09:20:20 AM

Question 671. Asked on :06 September 2019:03:37:16 PM

Name things get from coal?

-Added by Shruti Srivastva Science » Science

Answer:

priyanshu kumar
Coal tar.

-Answered by priyanshu kumar On 08 October 2019:09:20:39 AM

Question 672. Asked on :06 September 2019:03:33:58 PM

What is carbonisation?

-Added by Shruti Srivastva Science » Science

Answer: