Asked/Added Questions From NCERT: Science


Question 1. Asked on :08 May 2019:08:32:58 AM

 List conditions under which combustion can rake place 

-Added by Sonu kumar Science » Combustion And Flame `

Answer:

Hitesh kumar

 combustion is a process of reaction of a substance with oxygen there are 

-Answered by Hitesh kumar On 11 May 2019:08:29:25 AM


Question 2. Asked on :07 May 2019:10:15:48 AM

Write four chemical reaction 

-Added by killer master Science » Chemical And Reaction

Answer:

sonu kumar

 Chemical reactions can be categorized principally into four basic types. These do not cover all reactions though. Some, such as redox reactions may fit into more than one category.

-Answered by sonu kumar On 07 May 2019:10:17:34 AM


Question 3. Asked on :07 May 2019:10:15:48 AM

Write four chemical reaction 

-Added by killer master Science » Chemical And Reaction

Answer:

Sonu kumar

 Chemical reactions can be categorized principally into four basic types. These do not cover all reactions though. Some, such as redox reactions may fit into more than one category.

-Answered by Sonu kumar On 08 May 2019:08:41:06 AM


Question 4. Asked on :07 May 2019:10:12:40 AM

 What is chemical

-Added by Sohail royal Science » Chemical And Reaction

Answer:

sonu kumar

chemical is any substance consisting of matter. This includes any liquid, solid, or gas. A chemical is any pure substance (an element) or any mixture (a solution, compound, or gas). Chemicals occur naturally and can be made artificially.

-Answered by sonu kumar On 07 May 2019:10:14:36 AM


Question 5. Asked on :07 May 2019:08:36:02 AM

 which is liberated when metals react with aluminium?

-Added by priyanshu kumar Science » Chemical And Reaction

Answer:

Sonu kumar

  Except HNO3, Aluminum reacts with other mineral acids to form their respective salts and liberate Hydrogen gas. However with HNO3, it forms an oxide coating over the metal. It renders metal passive and protects the metal from further attack of the acid.

-Answered by Sonu kumar On 08 May 2019:08:17:51 AM


Question 6. Asked on :07 May 2019:08:28:56 AM

 Which of the following reaction takes place when aluminium react with

sodium hydroxide?

-Added by priyanshu kumar Science » Chemical And Reaction

Answer:

sonu kumar

 5 mins ago - Which of the following reaction takes place when aluminium react withsodium hydroxide? Science Chemical ... sodium hydroxide? -Added by ...

-Answered by sonu kumar On 07 May 2019:10:13:00 AM


Question 7. Asked on :06 May 2019:10:29:47 AM

 what is meant by the term 'industry?

-Added by priyanshu kumar Science » Industries

Answer:

sonu kumar

  services within an economy.he term 'industry' implies an economic activity involving goods production, mineral extraction or provision of consumer services. Industry is the production of goods or related

-Answered by sonu kumar On 06 May 2019:10:34:37 AM


Question 8. Asked on :06 May 2019:10:26:55 AM

 what is plantation agriculture?

-Added by priyanshu kumar Science » Agriculture

Answer:

sonu kumar

 Plantation agriculture is a form of commercial farming where crops are grown for profit. Large land areas are needed for this type of agriculture. Countries that haveplantation agriculture usually experience tropical climate with high annual temperatures and receive high annual rainfall.

-Answered by sonu kumar On 06 May 2019:10:30:03 AM


Question 9. Asked on :06 May 2019:08:30:55 AM

 कंप्यूटर क्या है? कंप्यूटर के 10 उपयोग लिखो

-Added by rocki kumar Science » Computer

Answer:

Sonu kumar

 Sep 9, 2018 - आज के युग में लगभग सभी लोग कंप्यूटर से परिचित होंगे क्योंकि लगभग हर जगह मतलब की सभी ऑफिस में, स्कूल में, कॉलेज में इत्यादी जगह पर कंप्यूटर का उपयोग होता है| अब तो लगभग सभी लोगो के घर में कंप्यूटर मौजूद होता है| Computer का उपयोग आजकल हर .... मौसम के बारे में पहले पता लग जाता है और उसके बाद हम मौसम के हिसाब से अपना routine बनाते हैं की आज क्या करना है, कब करना है, ... 10. Banking. बैंकिंग क्षेत्र में कंप्यूटर का इस्तेमाल अपने customer का record रखने के लिए किया जाता है| तरह तरह के ...

-Answered by Sonu kumar On 06 May 2019:08:37:01 AM


Question 10. Asked on :06 May 2019:08:25:23 AM

  

-Added by rocki kumar Science » Computer


Question 11. Asked on :06 May 2019:08:20:15 AM

 भोजन के लाभ लिखो 

-Added by rocki kumar Science » Science

Answer:

Sonu kumar

 ऐसा कोइ भी पदार्थ जो शर्करा (कार्बोहाइड्रेट), वसा, जल तथा/अथवा प्रोटीन से बना हो और जीव जगत द्वारा ग्रहण किया जा सके, उसे भोजन कहते हैं। जीव न केवल जीवित रहने के लिए बल्कि स्वस्थ और सक्रिय जीवन बिताने के लिए भोजनकरते हैं। भोजन में अनेक .

-Answered by Sonu kumar On 06 May 2019:08:30:14 AM


Question 12. Asked on :05 May 2019:08:09:48 AM

FULL form CFC 

-Added by rocki kumar Science » Science

Answer:

Hitesh kumar

 Chlorofluorocarbon(CFC) is any of various halocarbon compounds consisting of carbon, hydrogen, chlorine, and fluorine. CFC were once used widely as aerosol propellants and refrigerants.Chlorofluorocarbons are believed to cause depletion of the atmospheric ozone lay

-Answered by Hitesh kumar On 05 May 2019:08:18:33 AM


Question 13. Asked on :05 May 2019:08:00:53 AM

भारत की कितने राजधानी है ? राज्य के साथ राजधानी के नाम लिखो 

-Added by rocki kumar Science » Science

Answer:

Hitesh kumar

** भारत के राज्य और उनकी राजधानी **-----------------------------------------------------

1. बिहार - पटना

2. पश्चिम बंगाल - कोलकाता

3. असम - दिसपुर

4. आंध्रप्रदेश - अमरावती (new),  हैदराबाद (old)

5. उड़ीसा - भुवनेश्वर

6. उत्तर प्रदेश - लखनऊ

7. कर्नाटक - बंगलौर

8. केरल - तिरुवनन्तपुरम्

9. गुजरात - गांधीनगर

10. जम्मू-कश्मीर - श्रीनगर

11. तमिलनाडु - चेन्नई

12. त्रिपुरा - अगरतल्ला

13. नागालैंड - कोहिमा

14. पंजाब - चंडीगढ़

15. हरियाणा - चंडीगढ़

16. मणिपुर - इम्फाल

17. मध्यप्रदेश - भोपाल

18. महाराष्ट्र - मुंबई

19. मेघालय - शिलांग

20. राजस्थान - जयपुर

21. हिमाचल प्रदेश - शिमला

22. सिक्किम - गंगटोक

23. मिजोरम - आइजॉल

24. अरुणाचल प्रदेश - ईटानगर

25. गोवा - पणजी

26. उत्तराखंड - देहरादून

27. छत्तीसगढ़ - रायपुर

28. झारखंड - रांची

29. तेलंगाना - हैदराबाद

केंद्रशासित राज्य और उसकी राजधानी 

1.दिल्ली - नई दिल्ली

2. लक्षद्वीप - कवारत्ती

3. दमन और दीव - दमन

4. अंडमान-निकोबार - पोर्ट ब्लेयर

5. चंडीगढ़ - चंडीगढ़

6. पुदुचेरी - पुदुचेरी

7. दादर व नगर हवेली - सिलवासा

Share with your friends..........श्रीराम कोचिंग, सीकर

अमरावती

-Answered by Hitesh kumar On 05 May 2019:08:20:43 AM


Question 14. Asked on :05 May 2019:07:55:51 AM

कृषि की हानियाँ 

-Added by rocki kumar Science » Science

Answer:

Sonu kumar

 Jan 18, 2018 - तुफैल इदरीसी अमेठी: भारतीय कृषि जैविक केंद्र गाजियाबाद देश में एक बहुत बड़ी क्रांति लाने में सफल हुए हैं आज जहां किसान महंगे रासायनिक खाद कीटनाशक आदि का उपयोग करते-करते अपने खेत की मिट्टी को अनुपजाऊ कठोर और जहरीला बना ...

-Answered by Sonu kumar On 06 May 2019:08:31:46 AM


Question 15. Asked on :04 May 2019:10:30:18 AM

कृषि के फायदे क्या है

-Added by Hitesh kumar Science » Science

Answer:

Hitesh kumar

 इस भाग में संरक्षण खेती के फायदे की जानकारी दी गई है। ... का गिरना, भू-जलस्तर में गिरावट, कृषि मजदूरों में कमी व कृषि आयातों की बढ़ती कीमतों की वजह से पारम्परिक खेती के अन्तर्गत उत्पादन खर्च में वृद्धि व शुद्ध मुनाफे में कमी हो रही है।

-Answered by Hitesh kumar On 05 May 2019:08:26:53 AM


Question 16. Asked on :04 May 2019:09:55:15 AM

 What is the name of  reproduction  in which fusion of male and female gametes takes place ?  

-Added by Prince Rawat Science » Science

Answer:

rocki kumar

 Fusioiplon. During sexual reproduction, a male and female gamete will merge together to form a new organism. The two haploid cells will fuse together to form a did cell called a zygote.

-Answered by rocki kumar On 04 May 2019:10:01:56 AM


Question 17. Asked on :04 May 2019:09:53:12 AM

 What are two modes by which animals reproduce?


-Added by Prince Rawat Science » Science

Answer:

rocki kumar

 Some simple animals, many of whom are single celled, reproduce asexually. The different modes of asexual reproduction in animals include gemmules (sponges),fragmentation (planarians), regeneration (echinoderms) and parthenogenesis (ants, wasps

-Answered by rocki kumar On 04 May 2019:10:03:42 AM


Question 18. Asked on :03 May 2019:10:24:23 AM

कोशिका क्या  है

-Added by ravi varma Science » Science

Answer:

sonu kumar

 कोशिका (Cell) सजीवों के शरीर की रचनात्मक और क्रियात्मक इकाई है और प्राय: स्वत: जनन की सामर्थ्य रखती है। यह विभिन्न पदार्थों का वह छोटे-से-छोटा संगठित रूप है जिसमें वे सभी क्रियाएँ होती हैं जिन्हें सामूहिक रूप से हम जीवन कहतें हैं

-Answered by sonu kumar On 03 May 2019:10:29:20 AM


Question 19. Asked on :03 May 2019:08:39:26 AM

प्रकाश की परिभाषा दीजिये?

-Added by Hitesh kumar Science » Science

Answer:

ravi varma

 यह एक प्रकार की ऊर्जा है जब प्रकाश हमारी आँख की रेटिना पर पड़ता है तो इसके रेटिना पर गिरने से दृष्टि संवेदना उत्पन्न होती है और हमें वस्तुएं दिखाई देती है। प्रकाश ...

-Answered by ravi varma On 03 May 2019:10:07:11 AM


Question 20. Asked on :03 May 2019:08:42:42 AM

 Explain asexual reproduction

-Added by killer master Science » Human Bodies

Answer:

sonu kumar

 Asexual reproduction is a type of reproduction by which offspring arise from a single organism, and inherit the genes of that parent only; it does not involve the fusion of gametes, and almost never changes the number of chromosomes. ... Many plants and fungi sometimes reproduce asexually.

-Answered by sonu kumar On 03 May 2019:10:19:01 AM


Question 21. Asked on :03 May 2019:08:36:52 AM

what do you mean by sperm are product in the male reproductive organ

-Added by killer master Science » Science Mindly Questions

Answer:

ravi varma

The internal organs of the male reproductive system, also called accessoryorgans, include the following: Epididymis: The epididymis is a long, coiled tube that rests on the backside of each testicle. It transports and stores sperm cells that are produced in the testes. 

-Answered by ravi varma On 03 May 2019:10:12:38 AM


Question 22. Asked on :03 May 2019:08:33:34 AM

 वास्पीकरण किसे कहते है ?

-Added by Hitesh kumar Science » Science

Answer:

ravi varma

 किसी तत्त्व या यौगिक का द्रव अवस्था से गैस अवस्था में परिवर्तन वाष्पीकरण (Vaporization या vaporisation) कहलाता है। वाष्पीकरण दो प्रकार का होता है- वाष्पन, तथा क्वथन। इन्हें भी देखें[संपादित करें]. वाष्पन (evaporation); क्वथन · संघनन · ऊर्ध्वपातन.

-Answered by ravi varma On 03 May 2019:10:15:48 AM


Question 23. Asked on :03 May 2019:08:34:30 AM

 प्रकाश क्या है?

-Added by killer master Science » Science Mindly Questions

Answer:

Hitesh kumar

  प्रकाश एक प्रकार की ऊर्जा है, जो विद्युत चुंबकीय तरंगों के रूप में संचारित होती है। इसका ज्ञान हमें आँखों द्वारा होता है इसका तरंग दैर्ध्य 3900 Ӑ से 7800 Ӑ के बीच होता है। प्रकाश का विद्युत चुंबकीय तरंग सिद्धांत प्रकाश के केवल ...


-Answered by Hitesh kumar On 03 May 2019:08:37:57 AM


Question 24. Asked on :03 May 2019:08:30:51 AM

 differentiate between internal fertilisation and external fertilisation

-Added by killer master Science » Science Mindly Questions

Answer:

sonu kumar

 The difference between internal and external fertilization is that internal fertilization occurs inside the body, whereas external fertilizationhappens outside the body. Fertilization is the process by which a sperm cell and an egg cell unite to form a completely new individual.

-Answered by sonu kumar On 03 May 2019:10:50:56 AM


Question 25. Asked on :03 May 2019:08:30:51 AM

 differentiate between internal fertilisation and external fertilisation

-Added by killer master Science » Science Mindly Questions

Answer:

ravi varma

 The difference between internal and external fertilization is that internal fertilization occurs inside the body, whereas external fertilizationhappens outside the body. Fertilization is the process by which a sperm cell and an egg cell unite to form a completely new individual.

-Answered by ravi varma On 03 May 2019:10:23:30 AM


Question 26. Asked on :03 May 2019:08:29:05 AM

 What is metamorphosis ? give example

-Added by killer master Science » Science Mindly Questions

Answer:

sonu kumar

 MetamorphosisMetamorphosis, in biology, striking change of form or structure in an individual after hatching or birth. ... Examples of metamorphosis include the tadpole, an aquatic larval stage that transforms into the land-dwelling frog (class Amphibia).

-Answered by sonu kumar On 03 May 2019:10:32:07 AM


Question 27. Asked on :03 May 2019:08:20:48 AM

क्या सभी जीबों को एक ही किस्म के भोजन की आवस्यकता होती है ?


-Added by Hitesh kumar Science » Science

Answer:

sonu kumar

 क्या सभी जीवों को एक ही किस्म के भोजन की आवश्यकता होती है? Answer: नही, सभी जीवों को एक ही किस्म के भोजन की आवश्यकता नही होती है विभिन्न तरह के जीवों को विभिन्न तरह के भोजन कि आवश्यकता होती है। जैसे: शाकाहारी जीव 

-Answered by sonu kumar On 03 May 2019:10:27:39 AM


Question 28. Asked on :03 May 2019:08:25:32 AM

 Describe the process fertilisation in human beings

-Added by killer master Science » Science Mindly Questions

Answer:

ravi varma

 Human fertilization is the union of a human egg and sperm, usually occurring in the ampulla of the fallopian tube. The result of this union is the production of a zygote cell, or fertilized egg, initiating prenatal development. ... The process of fertilizationinvolves a sperm fusing with an ovum.

-Answered by ravi varma On 03 May 2019:10:32:12 AM


Question 29. Asked on :03 May 2019:08:25:32 AM

 Describe the process fertilisation in human beings

-Added by killer master Science » Science Mindly Questions

Answer:

rocki kumar

 17अक्टूबर1887

-Answered by rocki kumar On 04 May 2019:08:21:07 AM


Question 30. Asked on :02 May 2019:10:09:06 AM

समांगी और विस्मांगी में अन्तर स्पस्ट कीजिए  

-Added by ravi varma Science » Science

Answer:

priyanshu kumar

  समांगी मिश्रण : ऐसे मिश्रण जिसमें दो या दो से अधिक अवयव उपस्थित होते हैं किंतु उंहें अलग-अलग देखा नहीं जा सकता उन्हें समांगी मिश्रण कहते हैं। उदाहरण : नमक और पानी का मिश्रण. विषमांगी मिश्रण : ऐसे मिश्रण जिनमें दो या दो से ...

-Answered by priyanshu kumar On 02 May 2019:10:56:10 AM


Question 31. Asked on :30 April 2019:09:55:52 AM

 What do you mean by non- metals

-Added by Sohail alam Science » Science Mindly Questions

Answer:

priyanshu kumar

  Nonmetal or non-metal is a chemical element thatdoes not have the properties of a metal. ... Usually, gases or brittle solids are non-metals. Elements on the periodic table can be classified as metal, semimetal, or non-metal. Five times more elementsare metals than nonmetals.

-Answered by priyanshu kumar On 02 May 2019:10:58:43 AM


Question 32. Asked on :27 April 2019:08:22:53 AM

 explain the differences between pure air and polluted air


-Added by Sohail alam Science » Pollution

Answer:

Hitesh kumar

 These steps, as well as many others, are things we all can do to help reduce air pollution. Conserve energy – remember to turn off lights, computers, and electric appliances when not in use. Use energy efficient light bulbs and appliances. Participate in your local utility's energy conservation programs

-Answered by Hitesh kumar On 27 April 2019:08:28:20 AM


Question 33. Asked on :27 April 2019:08:23:14 AM

what will happen if we drink polluted water  

-Added by Hitesh kumar Science » S.s.t

Answer:

priyanshu kumar

 Drinking or swimming in unclean water can cause: Vomiting or diarrhea. A sick stomach. ... Reproductive problems (Some kinds of reproductive problems, like infertility, can happen afterdrinking polluted water for a long period of time)

-Answered by priyanshu kumar On 29 April 2019:10:36:20 AM


Question 34. Asked on :27 April 2019:08:19:35 AM

 How would the disposal of garbage etc. affects the livings organisms

in the river

-Added by Sohail alam Science » Pollution

Answer:

priyanshu kumar

 how would the disposal of garbage affect the living organisms in the river. Groundwater contamination from pesticides causes reproductive damage within wildlife in ecosystems. ... Ecosystems are destroyed by the rising temperature in the water, as coral reefs are affected by the bleaching effect due to warmer temperatures.

-Answered by priyanshu kumar On 29 April 2019:10:41:40 AM


Question 35. Asked on :27 April 2019:08:17:51 AM

What can we do to reduce air pollution

 

-Added by Sohail alam Science » Pollution

Answer:

priyanshu kumar

 These steps, as well as many others, are things we all can do to help reduce air pollution.

-Answered by priyanshu kumar On 30 April 2019:10:16:26 AM


Question 36. Asked on :27 April 2019:08:17:00 AM

Which of the following is not true

-Added by Hitesh kumar Science » S.s.t

Answer:

priyanshu kumar

 Jan 19, 2019 - Which of the following is 'NOT' true? Options: A) Teaching Is An Art. B) Teachers Can Be Trained. C) Teachers Are Born. D) All Of The Above ...


-Answered by priyanshu kumar On 29 April 2019:10:44:53 AM


Question 37. Asked on :27 April 2019:08:14:40 AM

have you heard of the ozone hole

 

-Added by Sohail alam Science » Pollution

Answer:

Sonu kumar

 Chlorofluorocarbons and ozone. Many people have heard that the ozone hole is caused by chemicals called CFCs, short for chlorofluorocarbons. CFCs escape into the atmosphere from refrigeration and propellant devices and processes. In the lower atmosphere, they are so stable that they persist for years, even decades.Oct 18, 2018

-Answered by Sonu kumar On 30 April 2019:10:16:54 AM


Question 38. Asked on :27 April 2019:08:08:05 AM

 How did the partition affect life in Delhi

-Added by Hitesh kumar Science » S.s.t

Answer:

priyanshu kumar

 Answer: The Partition of India in 1947 led to a massive transfer of populations on both sides of the new border. As a result, the population of Delhi swelled, the kinds of jobs people did changed, and the culture of the city became different. ... Thousands of people in Delhi were killed and their homes looted and burned.

-Answered by priyanshu kumar On 30 April 2019:10:26:31 AM


Question 39. Asked on :26 April 2019:08:38:06 AM

 What are the causes of hearing impairment?

-Added by priyanshu kumar Science » Sound

Answer:

Sohail alam

 Damage to the inner ear. Aging and exposure to loud noise may cause wear and tear on the hairs or nerve cells in the cochlea that send sound signals to the brain. When these hairs or nerve cells are damagedor missing, electrical signals aren't transmitted as efficiently, and hearing loss occurs.

-Answered by Sohail alam On 26 April 2019:08:43:39 AM


Question 40. Asked on :26 April 2019:08:30:23 AM

 What is noise ? Do you enjoy the sound produced by horns of buses and trucks ? why ?

-Added by priyanshu kumar Science » Sound

Answer:

Sohail alam

 The truck BHA007 features the insanely loud, india-madetruck Horns. These horns are ridiculously loud and, more importantly, actually sound like a blast! The horns are hand-tuned in the india. Simply put, they sound completely authentic. ... responsibility to comply with local noise ordinances and D.O.T. sound level laws.

-Answered by Sohail alam On 26 April 2019:08:46:36 AM


Question 41. Asked on :26 April 2019:08:27:52 AM

 Do you feel the vibrations?

-Added by priyanshu kumar Science » Sound

Answer:

priyanshu kumar

 Yes I feel the vibrations.

-Answered by priyanshu kumar On 26 April 2019:08:46:49 AM


Question 42. Asked on :26 April 2019:08:19:47 AM

 

-Added by Sohail alam Science » Science


Question 43. Asked on :25 April 2019:09:39:31 PM

Write the law of reelection?

-Added by Nitish kumar Science » Light

Answer:

Sohail alam

 Election law is a discipline falling at the juncture of constitutional law and political science. It researches "the politics of law and the law of politics". The conceptual knowledge behind election law focuses on who votes, when that person can vote, and the construction behind the tabulated totals.[1]

-Answered by Sohail alam On 26 April 2019:08:01:10 AM


Question 44. Asked on :25 April 2019:09:37:40 PM

 What is reflected rays?

-Added by Nitish kumar Science » Light

Answer:

priyanshu kumar

 An incident ray is a ray of light that strikes a surface. ... The reflected ray corresponding to a given incident ray, is the ray that represents the lightreflected by the surface. The angle between the surface normal and the reflected ray is known as the angle of reflection.

-Answered by priyanshu kumar On 26 April 2019:09:02:27 AM


Question 45. Asked on :25 April 2019:09:35:53 PM

 What is incident rays?

-Added by Nitish kumar Science » Light

Answer:

priyanshu kumar

 An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.

-Answered by priyanshu kumar On 26 April 2019:08:54:16 AM


Question 46. Asked on :25 April 2019:09:34:06 PM

 What are iris ?Write the function of iris?

-Added by Nitish kumar Science » Light

Answer:

Sohail alam

 The function of iris is to control the diameter and size of the pupil and the functionof pupil is to control the amount of light that enters the eye. The primary function of the human pupil is to regulate the amount of light that enters the eye.

-Answered by Sohail alam On 26 April 2019:08:56:45 AM


Question 47. Asked on :25 April 2019:09:32:50 PM

 What is Corina?

-Added by Nitish kumar Science » Light

Answer:

priyanshu kumar

 A female given name, a variant of Corinna.

-Answered by priyanshu kumar On 26 April 2019:08:55:16 AM


Question 48. Asked on :25 April 2019:09:29:33 PM

 What is S.I unit of wave length?

-Added by Nitish kumar Science » Sound

Answer:

priyanshu kumar

 Wavelength is also measured in metres (m) - it is a length after all. The frequency, f, of a wave is the number of waves passing a point in a certain time. We normally use a time of one second, so this gives frequency the unit hertz (Hz), since one hertz is equal to one wave per second.

-Answered by priyanshu kumar On 26 April 2019:08:57:15 AM


Question 49. Asked on :25 April 2019:09:27:02 PM

 What is S.I unit of frequency ?

-Added by Nitish kumar Science » Sound

Answer:

priyanshu kumar

 Units. The SI derived unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz. One hertz means that an event repeats once per second.

-Answered by priyanshu kumar On 26 April 2019:09:00:24 AM


Question 50. Asked on :25 April 2019:09:24:08 PM

 What is minimum audible distance from sound source to barrier medium?

-Added by Nitish kumar Science » Sound

Answer:

priyanshu kumar

 of compressions and rarefactions in the elastic medium, as illustrated by Figure 1.1(a). When .... to a distance from the source equal to about a wavelength of sound or equal to three times the .... The minimum audible level occurs at .... such as barriers and reflectors on the sound pressure level at an observation point.

-Answered by priyanshu kumar On 26 April 2019:08:58:14 AM


Question 51. Asked on :25 April 2019:09:21:16 PM

 What is minimum audible range of human ears?

-Added by Nitish kumar Science » Sound

Answer:

priyanshu kumar

 The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions,humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditorychannel of the cochlea.

-Answered by priyanshu kumar On 26 April 2019:09:01:00 AM


Question 52. Asked on :25 April 2019:09:17:33 PM

 What is eco sound?

-Added by Nitish kumar Science » Sound

Answer:

priyanshu kumar

 echo. An echo is a repetition or imitation of sound. When sound waves hit a hard surface they might reflect, making the sound bounce and repeat.

-Answered by priyanshu kumar On 26 April 2019:09:03:16 AM


Question 53. Asked on :25 April 2019:08:48:24 AM

what do you mean by butterfly life cycle

-Added by Sohail alam Science » G.k

Answer:

Nishant verma

ans.The LIFE-CYCLE OF A BUTTERFLYButterflies and moths undergo complete metamorphosis in which they go through four different life stages. Egg - A butterflystarts its life as an egg. Larva - The larva (caterpillar) hatches from an egg and eats leaves or flowers almost constantly. 

-Answered by Nishant verma On 25 April 2019:05:34:29 PM


Question 54. Asked on :25 April 2019:08:22:56 AM

Write the five properties of Base?

-Added by Prince Rawat Science » Acids, Bases And Salts

Answer:

Nishant verma

ans.Chemical Properties of Bases

  • Bases change the colour of litmus from red to blue.
  • They are bitter in taste.
  • Bases lose their basicity when mixed with acids.
  • Bases react with acids to form salt and water. ...
  • They can conduct electricity.
  • Bases feel slippery or soapy.
  • Some bases are great conductors of electricity.

 

-Answered by Nishant verma On 25 April 2019:05:35:46 PM


Question 55. Asked on :25 April 2019:08:18:05 AM

 What is natural acids? 

-Added by Prince Rawat Science » Acids, Bases And Salts

Answer:

Nishant verma

 ans. Nitric acid, sulfuric acid, hydrocloric and all organic acids. ... They all can be created naturaly, though not all of them exist in nature as acid, becouse some of them react imediately with its suroundings or is unstable in some way. You could say there is some sort of fancy acid .

-Answered by Nishant verma On 25 April 2019:05:38:09 PM


Question 56. Asked on :25 April 2019:08:20:12 AM

What do you mean by natural gas ?

 

-Added by Sohail alam Science » G.k

Answer:

Nishant verma

 ans.

natural gas

flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground (often in association with petroleum) and used as fuel.

-Answered by Nishant verma On 25 April 2019:05:45:42 PM


Question 57. Asked on :25 April 2019:08:12:59 AM

how will she find the nature of the gas?

-Added by Sohail alam Science » G.k

Answer:

Sonu kumar

 Mar 22, 2018 - Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. How will she find the nature of the gas? Write down word ...

-Answered by Sonu kumar On 30 April 2019:10:26:14 AM


Question 58. Asked on :25 April 2019:08:12:59 AM

how will she find the nature of the gas?

-Added by Sohail alam Science » G.k

Answer:

priyanshu kumar

 Mar 22, 2018 - Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. How will she find the nature of the gas? Write down word ...


-Answered by priyanshu kumar On 30 April 2019:10:19:44 AM


Question 59. Asked on :25 April 2019:08:12:59 AM

how will she find the nature of the gas?

-Added by Sohail alam Science » G.k

Answer:

Sonu kumar

 question_answer 1) Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. (a) How will she find the nature of the gas? (b) Write ...

-Answered by Sonu kumar On 30 April 2019:10:22:29 AM


Question 60. Asked on :25 April 2019:08:04:53 AM

Give reasons


aluminium foils are used to wrap foods item




-Added by Sohail alam Science » G.k

Answer:

Nishant verma

 ans.Aluminium foils are used to wrap food items because aluminium being a soft malleable metal it can be beaten to in sheets to form thin wrapping sheets. Moreover it does not react with food items. Immersion rods are made of metallic substances metals are good conductors of heat and electricity.

-Answered by Nishant verma On 25 April 2019:05:53:30 PM


Question 61. Asked on :25 April 2019:08:06:52 AM

 Do you see any waves there?

-Added by priyanshu kumar Science » Sound

Answer:

priyanshu kumar

 Aug 21, 2013 - Alpha waves are rhythmical electrical fields generated in the brain. ... So why don't we see something roughly 10 times every second? ... well, showing that there is a frequency correspondence does not suffice, one would ...


-Answered by priyanshu kumar On 30 April 2019:10:24:33 AM


Question 62. Asked on :24 April 2019:08:26:41 AM

 name two natural causes of deforestation.

-Added by Sohail alam Science » Conservation Of Plant And Animals

Answer:

rocki kumar

 Apr 23, 2019 - Give an example of plant that belongs to group Bryophyta? ... Chapter 12 Reproduction In Plants (3) ... Conservation Of Plant And Animals (1).


-Answered by rocki kumar On 04 May 2019:08:27:07 AM


Question 63. Asked on :23 April 2019:09:51:51 AM

 Give to examples of plants that belongs it group angiosperm?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

Sohail alam

 some examples of angiosperms are as follows: Apple (Malus pumila) Brinjal (Solanum melongena) Guava (Psidium guajava) Jackfruit (Artocarpus heterophyllus) Litchi (Litchi chinensis) Mango (Mangifera indica) Papaya (Carica papaya) Pea (Pisum sativum)

-Answered by Sohail alam On 24 April 2019:08:08:20 AM


Question 64. Asked on :23 April 2019:09:49:28 AM

 Hoe male cone of pinus is different from female cone of pinus?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

Sohail alam

 Female pine cones hold the seeds whereas male pine cones contain the pollen. Most conifers, or cone-bearing trees, have female and male pine cones on the same tree. A female pine cone, also called a megasporangiate strobilus, consists of cone or seed scales that hold two ovules, the unfertilized seeds.

-Answered by Sohail alam On 24 April 2019:08:11:06 AM


Question 65. Asked on :23 April 2019:09:48:26 AM

 What are cones in pinus?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

Sohail alam

 A cone (in formal botanical usage: strobilus, plural strobili) is an organ on plants in the division Pinophyta (conifers) that contains the reproductive structures. The familiar woody cone is the female cone, which produces seeds.

-Answered by Sohail alam On 24 April 2019:08:18:29 AM


Question 66. Asked on :23 April 2019:09:46:44 AM

 Give an example of plant that belongs to group Bryophyta?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

rocki kumar

 The king was told that in order to decide the right time for doing something, it was necessary to look into the future. Since only magicians could do so, he wasadvised to go to magicians

-Answered by rocki kumar On 05 May 2019:08:45:31 AM


Question 67. Asked on :23 April 2019:09:41:58 AM

Give one identifying feature of group which Spirogyra belongs?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD Fdsg

Answer:

priyanshu kumar

 Mar 27, 2018 - Mention the shape of chloroplast in spirogyra give one identifying feature of the group to which spirogyra belongs.

-Answered by priyanshu kumar On 30 April 2019:10:31:48 AM


Question 68. Asked on :23 April 2019:09:40:51 AM

 What is the biological name of mushroom ?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

Sohail alam

 Basidiomycota, The biological name of mushroom

-Answered by Sohail alam On 24 April 2019:08:12:29 AM


Question 69. Asked on :23 April 2019:09:38:37 AM

 What is common name for Funaria and Dryopteris?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

rocki kumar

 - What is common name for Funaria and Dryopteris? Science ORGANISATION IN THE LIVING ... Mathematics (100) · General Knowledge (387).


-Answered by rocki kumar On 08 May 2019:08:10:58 AM


Question 70. Asked on :23 April 2019:09:36:45 AM

 Alga belongs to which group ?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

Sonu kumar

 Algae, singular alga, members of a group of predominantly aquatic photosyntheticorganisms of the kingdom Protista. Algae have many types of life cycles, and they range in size from microscopic Micromonas species to giant kelps that reach 60 metres (200 feet) in length

-Answered by Sonu kumar On 02 May 2019:10:11:33 AM


Question 71. Asked on :23 April 2019:07:47:27 AM

what is organ 

-Added by Sohail alam Science » Science Mindly Questions

Answer:

Sonu kumar

 a part of an organism which is typically self-contained and has a specific vital function.

-Answered by Sonu kumar On 02 May 2019:10:26:45 AM


Question 72. Asked on :22 April 2019:03:57:11 PM

 What is carbon 

-Added by Sohail alam Science » Science

Answer:

Sonu kumar

 Carbon is a chemical element, like hydrogen, oxygen, lead or any of the others in the periodic table. Carbon is a very abundant element. It exists in pure or ...

-Answered by Sonu kumar On 02 May 2019:10:23:55 AM


Question 73. Asked on :22 April 2019:03:55:52 PM

 Write three elements of gases


-Added by Sohail alam Science » Science


Question 74. Asked on :22 April 2019:03:55:00 PM

 What is force

-Added by Sohail alam Science » Science

Answer:

Sonu kumar

 What is force? This definition explains what force is in the physical sciences and discusses its properties.

-Answered by Sonu kumar On 02 May 2019:10:29:27 AM


Question 75. Asked on :22 April 2019:03:51:55 PM

What do you mean by growth hormone  

-Added by Sohail alam Science » Science

Answer:

sonu kumar

 tation agriculture is a form of commercial farming where crops are grown for profitLarge land areas are needed for this type of agricultureCountries that have plantation agriculture usually expePlanrience high annual temperatures and receive high annual rainfallPlantation agriculture as mentioned above was introduced ...

-Answered by sonu kumar On 06 May 2019:10:32:15 AM


Question 76. Asked on :22 April 2019:03:48:16 PM

What is human


-Added by Sohail alam Science » Science Mindly Questions

Answer:

Sonu kumar

 As far as we know, human beings are the only creatures on earth that possess a brain developed to such an extent that they can ask this question of themselves: ...


-Answered by Sonu kumar On 02 May 2019:10:35:37 AM


Question 77. Asked on :22 April 2019:09:58:08 AM

A metal cylinder is melted and the whole mass is cast in the shape of a cube. What happens to its density? Give reasons. 

-Added by Nitish kumar Science » FORCE

Answer:

Hitesh kumar

 Density is constant for given substance or material. So, when it is cast into different shapes, the density of the material remains same as before.


Density is defined as the mass of the substance per unit volume. 


Density = Mass / Volume.


Mass of the metal cylinder and that of the cube will be same when measured via spring balance experiment. 


Mass of water displaced in both cases doesn't change. 


Similarly, volume of the water displaced in the measuring unit of the spring balance remains same in both the scenario.


So, density remains same. 



-Answered by Hitesh kumar On 22 April 2019:03:24:11 PM


Question 78. Asked on :22 April 2019:09:56:43 AM

 At which temperature the density of water is maximum?

-Added by Nitish kumar Science » FORCE

Answer:

Sohail alam

 39 °F

Answer: When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but at approximately 4 °C (39 °F), pure water reaches its maximum density. As it is cooled further, it expands to become less 

-Answered by Sohail alam On 22 April 2019:03:28:08 PM


Question 79. Asked on :22 April 2019:09:55:34 AM

 What would be the unit of displaced weight of liquid?

-Added by Nitish kumar Science » FORCE

Answer:

rocki kumar

 The mass of the displaced fluid can be expressed in terms of the density and its volume, m = ρV. The fluid displaced has aweight W = mg, where g is acceleration due to gravity. Therefore, the weight of the displaced fluid can be expressed as W = ρVg.

-Answered by rocki kumar On 08 May 2019:08:22:19 AM


Question 80. Asked on :22 April 2019:09:53:13 AM

 When happens when we immerse an object in bucket of water which is not filled to the brim?

-Added by Nitish kumar Science » FORCE

Answer:

priyanshu kumar

 Now, if we immerse an object into this bucket full of water, then the object will ... a bucket of water which is not filled to the brim, then the object will displace water ...

-Answered by priyanshu kumar On 04 May 2019:08:27:13 AM


Question 81. Asked on :22 April 2019:09:51:01 AM

 What is relation between volume of an object immersed in water and volume of displaced water?

-Added by Nitish kumar Science » FORCE

Answer:

priyanshu kumar

 The amount of fluid displaced is directly related (via Archimedes' principle) to its volume. In the case of an object that sinks (is totally submerged), the volume of the object is displaced. In the case of an object that floats, the amount of fluid displaced will be equal in weight to the displacing object.

-Answered by priyanshu kumar On 06 May 2019:10:02:39 AM


Question 82. Asked on :22 April 2019:09:48:36 AM

 What is meaning of term ''displaced liquid''.

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

 We can then know the volume of the object: it is equal to the volume of fluid displaced.

-Answered by priyanshu kumar On 06 May 2019:10:03:51 AM


Question 83. Asked on :22 April 2019:09:46:54 AM

 What is relative density?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

rocki kumar

 Is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water. ... If the reference material is water then a substance with a relative density (or specific gravity ...

-Answered by rocki kumar On 07 May 2019:08:21:19 AM


Question 84. Asked on :22 April 2019:09:42:48 AM

 What is hypertonic solution?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 85. Asked on :22 April 2019:09:42:07 AM

 What is isotonic solution?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

Rohit Rajput

 An isotonic solution refers to two solutions having the same osmotic pressure across a semipermeable membrane. This state allows for the free movement of water across the membrane without changing the concentration of solutes on either side

-Answered by Rohit Rajput On 08 May 2019:08:33:35 AM


Question 86. Asked on :22 April 2019:09:40:14 AM

What is endosmosis? 

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

Rohit Rajput

 The main difference between endosmosis and exosmosis is that endosmosis is the movement of water into the cell whereas exosmosis is the movement of water out of the cell. Endosmosis occurs when cells are placed in hypotonic solutions. ... Exosmosis occurs when cells are placed in hypertonic solutions.

-Answered by Rohit Rajput On 08 May 2019:08:34:40 AM


Question 87. Asked on :22 April 2019:09:38:05 AM

 What happens to the raisins when they are kept in warm water for few hours?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

rocki kumar

When raisins are kept in water for a few hours, the raisins will swell up or theywill expand in size. This happens due to osmosis, which is the movement of molecules from a region of its higher to its lower concentration through a semi or selectively permeable membrane. ... When raisins are soaked in waterthey swell. 

-Answered by rocki kumar On 08 May 2019:08:28:45 AM


Question 88. Asked on :22 April 2019:09:36:24 AM

 Do rate of endosmosis increase when kept at low temperature? why?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 89. Asked on :22 April 2019:09:33:53 AM

 What happens if a plant cell is placed in a high concentrated solution of sugar?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 90. Asked on :22 April 2019:09:32:07 AM

 Give an example of a substance where the material imbibes water?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 91. Asked on :22 April 2019:09:30:58 AM

 What is imbibition?

-Added by priyanshu kumar Science » ORGANISATION IN THE LIVING WORLD


Question 92. Asked on :22 April 2019:09:31:13 AM

 What is hypotonic solution?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 93. Asked on :22 April 2019:09:29:56 AM

What is imbibition pressure?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 94. Asked on :22 April 2019:09:27:07 AM

 Do raisins sweli up when kept in water? if yes, why?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 95. Asked on :22 April 2019:09:25:34 AM

 What are the features of striated muscle fibre? Where do we find these in our body?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 96. Asked on :22 April 2019:09:21:41 AM

Mention the function of skeletal muscles in or body.

-Added by priyanshu kumar Science » ORGANISATION IN THE LIVING WORLD


Question 97. Asked on :22 April 2019:09:23:37 AM

 You can bite fruits like guava, grapes,banana etc, but not a piece of wood. why?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 98. Asked on :22 April 2019:09:22:11 AM

 Mention the main function of sclerenchyma tissue?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

Himanshi Verma

 It gives strength to the plants.

-Answered by Himanshi Verma On 14 May 2019:11:20:29 AM


Question 99. Asked on :22 April 2019:09:20:18 AM

 Which tissue, when matured, has dead cells?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 100. Asked on :22 April 2019:09:13:55 AM

  In the transverse section of stem, which tissue occupies larger space-Parenchyma or Sclerenchyma?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 101. Asked on :22 April 2019:09:13:16 AM

 What are myelinated nerves?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 102. Asked on :22 April 2019:09:12:13 AM

 Which cells are found in the stiff parts of the plant?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 103. Asked on :22 April 2019:09:11:09 AM

 Which tissue helps in movement and locomotion of body?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar
Muscular tissue.

-Answered by priyanshu kumar On 22 April 2019:09:12:41 AM


Question 104. Asked on :22 April 2019:09:10:12 AM

 Name the membrane that covers the muscle fibre?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

 Sarcoiemma

-Answered by priyanshu kumar On 22 April 2019:09:11:24 AM


Question 105. Asked on :22 April 2019:09:08:40 AM

 Which cell provides mechanical strength to the plant body?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 106. Asked on :22 April 2019:09:07:45 AM

 What is the main function of nervous tissue?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 107. Asked on :22 April 2019:09:06:29 AM

 Name a multinucleated muscle fibre.

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

 Striated muscle

-Answered by priyanshu kumar On 22 April 2019:09:08:39 AM


Question 108. Asked on :22 April 2019:09:05:07 AM

 Name the tissue found in brain, spinal cord and nerves?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 109. Asked on :22 April 2019:08:57:34 AM

Which chemical substance gets deposited over sclerenchymatous cells to make their cell wall thickened?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

 Lignin.

-Answered by priyanshu kumar On 22 April 2019:09:07:59 AM


Question 110. Asked on :22 April 2019:08:56:03 AM

How many dendrites and axons are found in a nerve cell?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 111. Asked on :22 April 2019:08:54:05 AM

Name three major parts of a nerve cell? 

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

 Cell body axon and dendrite.

-Answered by priyanshu kumar On 22 April 2019:09:04:42 AM


Question 112. Asked on :22 April 2019:08:50:11 AM

 Name the plant tissue which is dead at maturity-parenchyma or Sclerenchyma?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

  Sclerenchyma

-Answered by priyanshu kumar On 22 April 2019:08:54:37 AM


Question 113. Asked on :22 April 2019:08:47:16 AM

 How parenchyma cells are different from sclerenchyma cells?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 114. Asked on :22 April 2019:08:42:00 AM

what is the shape of parenchyma cells.

-Added by priyanshu kumar Science » ORGANISATION IN THE LIVING WORLD


Question 115. Asked on :22 April 2019:08:45:41 AM

 Name the longest cell present in the human body?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

 Nerve cell.

-Answered by priyanshu kumar On 22 April 2019:08:53:05 AM


Question 116. Asked on :22 April 2019:08:43:47 AM

 What is a tissue?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

 Tissue is a group of cells of similar structure and function.

-Answered by priyanshu kumar On 22 April 2019:08:48:56 AM


Question 117. Asked on :22 April 2019:08:40:29 AM

 What do we use glycerine for mounting?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 118. Asked on :22 April 2019:08:39:12 AM

 Name the stain used for staining onion peel cells?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 119. Asked on :22 April 2019:08:37:56 AM

 What is the shape of cheek cells?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD

Answer:

priyanshu kumar

 They are irregular in shape.

-Answered by priyanshu kumar On 22 April 2019:08:39:24 AM


Question 120. Asked on :22 April 2019:08:36:06 AM

 How dose the onion peel appear before staining?

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 121. Asked on :22 April 2019:08:33:17 AM

What is the general shape of the onion cell? 

-Added by Nitish kumar Science » ORGANISATION IN THE LIVING WORLD


Question 122. Asked on :22 April 2019:08:32:36 AM

 What is the colour of Iodine?

-Added by Nitish kumar Science » FOOD


Question 123. Asked on :22 April 2019:08:26:38 AM

 Name the solution used for testing starch in food-stuff?

-Added by Nitish kumar Science » FOOD

Answer:

priyanshu kumar

 Iodine solution


-Answered by priyanshu kumar On 22 April 2019:08:29:07 AM


Question 124. Asked on :22 April 2019:08:23:06 AM

Priya used potato for testing starch. can you give reason why she choose potato for testing starch? 

-Added by Nitish kumar Science » FOOD


Question 125. Asked on :22 April 2019:08:20:36 AM

Which carbohydrate is injected in patient to give instant energy-Glucose or starch? 

-Added by Nitish kumar Science » FOOD


Question 126. Asked on :22 April 2019:08:15:16 AM

 Name two food material which contain starch in it?

-Added by Nitish kumar Science » FOOD

Answer:

priyanshu kumar

 Potato and Rice.

-Answered by priyanshu kumar On 22 April 2019:08:36:40 AM


Question 127. Asked on :21 April 2019:11:55:10 AM

 Is there any similarity between compounds LiH, MgO and K2S?

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 128. Asked on :21 April 2019:11:52:19 AM

 Why is it suggested to wear dark coloured goggles while watching the burning of magnesium ribbon in air?

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 129. Asked on :21 April 2019:11:49:19 AM

 Name gas that turns lime water milky?

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 130. Asked on :21 April 2019:11:42:42 AM

 Is there a possibility of a compound other than MgO formed in the reaction of magnesium and oxygen?

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 131. Asked on :21 April 2019:11:37:14 AM

 Why dose the red litmus paper turn blue when touched with aqueous solution of magnesium oxide?

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 132. Asked on :21 April 2019:11:31:07 AM

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

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 133. Asked on :21 April 2019:11:28:49 AM

 What is the basic principal involved in this experiment ?

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 134. Asked on :21 April 2019:11:25:45 AM

 What are the industrial applications of the type of the reaction being stuided?

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 135. Asked on :21 April 2019:11:23:29 AM

 Which gas, with brown fumes, is liberated on heating lead nitrate? 

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 136. Asked on :21 April 2019:11:22:31 AM

 Which gas catches fire with pop sound?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Hitesh kumar

  Hydrogen gas.

-Answered by Hitesh kumar On 22 April 2019:08:01:26 AM


Question 137. Asked on :21 April 2019:11:21:25 AM

 Is magnesium oxide acidic or basic?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Hitesh kumar

 It is basic in nature. 

-Answered by Hitesh kumar On 22 April 2019:08:03:01 AM


Question 138. Asked on :21 April 2019:11:18:03 AM

 What is observed in the solution of copper sulphate after the chemical reaction?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Hitesh kumar

  When Iron nail (Ferrum) is dipped in Copper sulphate (CuSO4) there takesreaction between them and coppersulphate change its color from blue to light green. ... 2) colour of the solution turns from blue to light green. The formula for this reaction is: Fe + CuSO4 --> FeSO4 + Cu. Here, Fe is more reactive than Cu.

-Answered by Hitesh kumar On 22 April 2019:08:03:50 AM


Question 139. Asked on :21 April 2019:11:16:26 AM

 In which type of reaction, dose an exchange of ions take place?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Hitesh kumar

 Double Displacement reaction.

-Answered by Hitesh kumar On 22 April 2019:08:04:55 AM


Question 140. Asked on :21 April 2019:11:13:34 AM

 In which type of reaction when aqueous solution of sodium hydroxide is treated with sulphuric acid?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Hitesh kumar

 In Decomposition reaction a compound breaks down to give two or more simpler substances. In this reaction there is only one reactant. Decomposition reaction is the opposite of a combination reaction. E.g : 1.Mercury (II) oxide on heating decomposes to give Mercury and oxygen.

-Answered by Hitesh kumar On 22 April 2019:08:08:05 AM


Question 141. Asked on :21 April 2019:11:11:45 AM

 What is the type of reaction in which the reactants give similar products?

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 142. Asked on :21 April 2019:11:08:40 AM

 What will be change in colour of CuSO4,if a Zn rod, cipped in it for two days? 

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 it get colourless.

-Answered by Himanshi Verma On 21 April 2019:11:20:48 AM


Question 143. Asked on :21 April 2019:11:07:47 AM

 what is displacement reaction?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 The reaction in which the highly reactive element displace the less reactive element is called displacement reaction.

-Answered by Himanshi Verma On 21 April 2019:11:22:06 AM


Question 144. Asked on :21 April 2019:11:06:11 AM

What are combination reaction? 

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 A reaction in which a single product is formed from two or more rectant is known as combination reaction.

-Answered by Himanshi Verma On 21 April 2019:11:07:53 AM


Question 145. Asked on :21 April 2019:11:04:25 AM

 what is decomposition reaction?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 The reactant in which a single reactant breaks down into two or more than two simpler products is called decomposition reaction.

-Answered by Himanshi Verma On 21 April 2019:11:09:12 AM


Question 146. Asked on :21 April 2019:11:01:15 AM

 Can copper displace iron from FeSO4 solution?Why?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 Copper displace iron from ferrous sulphate because copper is highly rective metal.

-Answered by Himanshi Verma On 21 April 2019:11:10:50 AM


Question 147. Asked on :21 April 2019:10:54:23 AM

 What is reactivity series of metals?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

Arrangement of metals in a vertical column in decreasing order of their reactivity mis called reactivity series.

-Answered by Himanshi Verma On 21 April 2019:10:56:48 AM


Question 148. Asked on :21 April 2019:10:50:16 AM

 What happens when hydrogen burns with airs?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 In a flame of pure hydrogen gas, burning in air, the hydrogen (H2) reacts with oxygen (O2) to form water (H2O) and releases heat. If carried out in atmospheric airinstead of pure oxygen (as is usually the case), hydrogen combustion may yield small amounts of nitrogen oxides, along with the water vapor.

-Answered by Himanshi Verma On 21 April 2019:11:00:47 AM


Question 149. Asked on :21 April 2019:10:49:17 AM

 What is sublimation?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 Sublimation is the process in which solid is directly converted into gas and gas change into solid.

-Answered by Himanshi Verma On 21 April 2019:11:01:13 AM


Question 150. Asked on :21 April 2019:10:48:12 AM

 What is reduction?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 The reaction in which addition of hydrogen or removal of Oxygen is called ruduction.

-Answered by Himanshi Verma On 21 April 2019:11:02:20 AM


Question 151. Asked on :21 April 2019:10:44:07 AM

 What are the type of chemical reaction ?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 Chemical reaction are five types:

1) Combination reaction

2) Decomposition reaction

3) Displacement reaction

4) Double Displacement reaction

5) Oxidation and reduction.

-Answered by Himanshi Verma On 21 April 2019:11:04:01 AM


Question 152. Asked on :21 April 2019:10:41:17 AM

 Is a chemical change also called chemical reaction ?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

 Yes, chemical change also called chemical reaction.

-Answered by Himanshi Verma On 21 April 2019:11:05:42 AM


Question 153. Asked on :21 April 2019:10:38:50 AM

 Balance a reaction between Al and aq dil. HCI.

-Added by Nitish kumar Science » Types Of Chemical Reactions


Question 154. Asked on :21 April 2019:10:35:21 AM

 What is chemical equation?

-Added by Nitish kumar Science » Types Of Chemical Reactions

Answer:

Himanshi Verma

  A written representation of a chemical reaction, in which the symbols and amounts of the reactants are separated from those of the products by an equal sign, arrow, or a set of opposing arrows. For example, Ca(OH) 2 + H2SO4 = CaSO 4 + 2H2O, is an equation.

-Answered by Himanshi Verma On 21 April 2019:11:06:57 AM


Question 155. Asked on :21 April 2019:09:47:49 AM

What are colloids ?

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

  In certain mixtures the relatively large particles called the dispersed phase are distribution throughout a solvent like medium called dispersing medium. So one particle is an aggregation of several atoms or molecules or ions. These particles and mixture is called a colloids. 

-Answered by Himanshi Verma On 21 April 2019:11:07:35 AM


Question 156. Asked on :21 April 2019:09:45:40 AM

 Can you see the colloidal particle by naked eye ?

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

 No size of colloidal particles are to small to be individually seen by naked eyes.

-Answered by Himanshi Verma On 21 April 2019:10:56:14 AM


Question 157. Asked on :21 April 2019:09:44:06 AM

 Give one example of colloid of a gas in liquid ?

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

 Foam, shaving cream. 

-Answered by Himanshi Verma On 21 April 2019:10:56:25 AM


Question 158. Asked on :21 April 2019:09:41:10 AM

 Give one example of solution of a gas in liquid ?

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

  Oxygen in water.

-Answered by Himanshi Verma On 21 April 2019:10:56:36 AM


Question 159. Asked on :21 April 2019:09:39:16 AM

 Why are the particles of a true solution not visible to naked eye ?

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

 Particles of true solutions are too small to be visible.

-Answered by Himanshi Verma On 21 April 2019:11:12:03 AM


Question 160. Asked on :21 April 2019:09:36:43 AM

 Do a particle of suspension scatter a beam of light?

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

  Yes ,it makes its path visible. 

-Answered by Himanshi Verma On 21 April 2019:11:12:15 AM


Question 161. Asked on :21 April 2019:09:34:32 AM

 Which sol is a colloid of solid in solid ?

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

 Coloured gemstone and milky glass are such sols.

-Answered by Himanshi Verma On 21 April 2019:11:12:26 AM


Question 162. Asked on :21 April 2019:09:33:49 AM

 What is emulsion .

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

  It is a colloid of liquid in liquid,i.e.,milk, face cream.

-Answered by Himanshi Verma On 21 April 2019:11:12:37 AM


Question 163. Asked on :21 April 2019:09:33:02 AM

 what is gel.

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

  A colloidal of liquid in solid is called gel. i.e., jelly, cheese,butter.

-Answered by Himanshi Verma On 21 April 2019:11:12:50 AM


Question 164. Asked on :21 April 2019:09:11:44 AM

 What is solution?

-Added by Prince Rawat Science » Nature Of Matter

Answer:

Himanshi Verma

 Any homogeneous mixture of two or more substances (solid, liquid or gases) is called solution .In solutions there is a homogeneity at micro level.

-Answered by Himanshi Verma On 21 April 2019:11:13:03 AM


Question 165. Asked on :21 April 2019:09:11:05 AM

 What is suspension .

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

 Materials of smaller particle size, insoluble in a solvent but visible to naked eye, give suspension.

-Answered by Himanshi Verma On 21 April 2019:11:13:20 AM


Question 166. Asked on :21 April 2019:09:09:46 AM

 Do suspension shows Tyndall effect? 

-Added by Prince Rawat Science » Nature Of Matter

Answer:

Himanshi Verma

 They may or may not show Tyndall effect.

-Answered by Himanshi Verma On 21 April 2019:11:13:50 AM


Question 167. Asked on :21 April 2019:09:09:10 AM

 What is physical nature of matter .

-Added by Nitish kumar Science » Nature Of Matter

Answer:

Himanshi Verma

  Matter is made up of small particles if a spoonfull of  salt is dissolved in a glass of water, the level of water does not change. 

-Answered by Himanshi Verma On 21 April 2019:11:13:34 AM


Question 168. Asked on :21 April 2019:09:07:25 AM

 Give to examples of colloidal solution. 

-Added by Prince Rawat Science » Nature Of Matter

Answer:

Himanshi Verma

  Blood, milk and gum. etc.

-Answered by Himanshi Verma On 21 April 2019:11:14:03 AM


Question 169. Asked on :19 April 2019:03:56:08 PM

 what do you mean by tilling 


-Added by Sohail alam Science » Science

Answer:

Himanshi Verma

 Tillage is the agricultural preparation of soil by mechanical agitation of various types, such as digging, stirring, and overturning. Examples of human-powered tilling methods using hand tools include shovelling, picking, mattock work, hoeing, and raking. ... "Tillagecan also mean the land that istilled.

-Answered by Himanshi Verma On 21 April 2019:11:14:18 AM


Question 170. Asked on :19 April 2019:02:51:12 PM

 

-Added by Sohail alam Science » Science H


Question 171. Asked on :19 April 2019:08:31:06 AM

 कॉमबाइन मशीन किसे कहते है?

-Added by priyanshu kumar Science » फसल उत्पादन एवं प्रबंध

Answer:

Sohail alam

 machine that simultaneously cutsthreshes, and cleans a standing crop of grain

-Answered by Sohail alam On 19 April 2019:02:49:21 PM


Question 172. Asked on :19 April 2019:08:29:31 AM

 What is chemical reaction.

-Added by Prince Rawat Science » Chemical Reaction And Equation

Answer:

Sohail alam

 Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

-Answered by Sohail alam On 19 April 2019:03:03:21 PM


Question 173. Asked on :18 April 2019:08:15:05 AM

 What do you mean by agriculture implements


-Added by Sohail alam Science » Science Mindly Questions

Answer:

Himanshi Verma

 The agricultural implements cover ploughs, threshers, axes, powrahs, chaffcutter machine, cultivators, seed drills, etc. These implements are used for agriculture work to improve the efficiency and reduce the labour. A large variety of agricultural implements are also used as attachments to tractors.

-Answered by Himanshi Verma On 21 April 2019:10:38:14 AM


Question 174. Asked on :17 April 2019:10:51:40 AM

 Where do the households or offices in cities get their drinking water from? 

-Added by Rohit Rajput Science » Pollution Of Air And Water Where


Question 175. Asked on :17 April 2019:10:46:16 AM

 What is potable water?

-Added by Rohit Rajput Science » Pollution Of Air And Water

Answer:

Hitesh kumar

 Potable water” simply means water that is safe to drink, and it is becoming scarcer in the world Increasing use is stressing freshwater resources worldwide, and a seemingly endless list of contaminants can turn once potable water into a health hazard or simply make it unacceptable aesthetically.


-Answered by Hitesh kumar On 20 April 2019:08:04:54 AM


Question 176. Asked on :17 April 2019:10:41:54 AM

 Which gas is most responsible for global warming?  

-Added by Rohit Rajput Science » Pollution Of Air And Water

Answer:

Himanshi Verma

 Co2 gas is most responsible for Global Warming. 

-Answered by Himanshi Verma On 21 April 2019:10:39:02 AM


Question 177. Asked on :17 April 2019:10:39:40 AM

What are the reasons of water scarcity? 

-Added by Rohit Rajput Science » Pollution Of Air And Water

Answer:

Himanshi Verma

 Economic water scarcity is caused by a lack of investment in infrastructure or technology to draw water from rivers, aquifers or other water sources, or insufficient human capacity to satisfy the demand for water. One quarter of the world's population is affected by economic water scarcity.

-Answered by Himanshi Verma On 21 April 2019:10:39:14 AM


Question 178. Asked on :17 April 2019:10:38:38 AM

 What is meant by air pollution? 

-Added by Rohit Rajput Science » Pollution Of Air And Water

Answer:

Himanshi Verma

 Air pollution is defined as the introduction of pollutants, organic molecules, or other unsafe materials into Earth’s atmosphere. This can be in the form of excessive gases like carbon dioxide and other vapours that cannot be effectively removed through natural cycles, such as the carbon cycle or the nitrogen cycle.

-Answered by Himanshi Verma On 21 April 2019:10:39:27 AM


Question 179. Asked on :17 April 2019:10:36:43 AM

 How is water getting polluted?

-Added by Rohit Rajput Science » Pollution Of Air And Water

Answer:

Himanshi Verma

 Chemical waste from factories is sometimes dumped into rivers and lakes, or directly into the ground. Pesticides (chemicals that kill insects) applied to farmland enter surface water and groundwater, often in large quantities. Once a pollutant enters a water supply, it is difficult to get rid of it.

-Answered by Himanshi Verma On 21 April 2019:10:39:38 AM


Question 180. Asked on :17 April 2019:10:34:47 AM

 Name the greenhouse gases.

-Added by Rohit Rajput Science » Pollution Of Air And Water

Answer:

Hitesh kumar

 Carbon dioxide (CO. ...

Methane (CH. ...

  • Nitrous oxide (N. 2O)
  • Ozone (O. ...
  • Chlorofluorocarbons (CFCs)
  • Hydrofluorocarbons (incl. HCFCs and HFCs)

-Answered by Hitesh kumar On 20 April 2019:10:00:10 AM


Question 181. Asked on :17 April 2019:10:32:33 AM

 what is greenhouse gases?

-Added by Rohit Rajput Science » Pollution Of Air And Water

Answer:

Himanshi Verma

  Greenhouse gas, any gas that has the property of absorbing  emitted from Earth’s surface and reradiating it back to Earth’s surface, thus contributing to the green house effect. carbon dioxide and methane and water vapour are the most important greenhouse gases. (To a lesser extent, surface-level  fluorinated gases also trap infrared radiation.) Greenhouse gases have a profound effect on the energy. budget of the Earth system despite making up only a fraction of all atmospheric gases. Concentrations of greenhouse gases have varied substantially during Earth’s history, and these variations have driven substantial climate changes. at a wide range of timescales. In general, greenhouse gas concentrations have been particularly high during warm periods and low during cold periods.

-Answered by Himanshi Verma On 21 April 2019:10:39:54 AM


Question 182. Asked on :17 April 2019:10:31:20 AM

 What sources in the home may lead to noise ? 

-Added by Rohit Rajput Science » Sound

Answer:

Himanshi Verma

  Household sources: Gadgets like food mixer, grinder, vacuum cleaner, washing machine and dryer, cooler, air conditioners, can be very noisy and injurious to health. Others include loud speakers of sound systems and TVs, ipods and ear phones.

-Answered by Himanshi Verma On 21 April 2019:10:40:16 AM


Question 183. Asked on :17 April 2019:10:27:51 AM

 Can you list some sources of noise pollution?

-Added by Rohit Rajput Science » Sound

Answer:

Himanshi Verma

  What are the sources of noise pollutionNoise can come from many places. ... Gadgets like food mixer, grinder, vacuum cleaner, washing machine and dryer, cooler, air conditioners, can be very noisy and injurious to health. Others include loud speakers of sound systems and TVs, ipods and ear phones.

-Answered by Himanshi Verma On 21 April 2019:10:40:28 AM


Question 184. Asked on :17 April 2019:10:25:16 AM

 Play this instrument and identify its vibrating part.

-Added by Rohit Rajput Science » Sound

Answer:

Himanshi Verma

  The vibrating part of the- flute is the air column which is vibrating and comes from within the instrument. veena is usually the strings, but they do it by means of the saddle and the bridge. tabla is the membranes which vibrate upon beating it.

-Answered by Himanshi Verma On 21 April 2019:10:40:44 AM


Question 185. Asked on :17 April 2019:10:24:03 AM

 Touch the school bell when not in use. what do you feel?

-Added by Rohit Rajput Science » Sound

Answer:

Himanshi Verma

 It feels like vibirating because all the things that produce sound vibrates

-Answered by Himanshi Verma On 21 April 2019:10:41:32 AM


Question 186. Asked on :17 April 2019:10:23:03 AM

 Make a list of sound you hear in your surroundings.

-Added by Rohit Rajput Science » Sound

Answer:

Himanshi Verma

 (1) horn of Vehicles

(2) Unpleasant sound of clubs, D.J

(3) Sound of Phone

-Answered by Himanshi Verma On 21 April 2019:10:42:18 AM


Question 187. Asked on :17 April 2019:10:20:09 AM

How do you come to know that a 'period' is over in your school?

-Added by Rohit Rajput Science » Sound

Answer:

Himanshi Verma

 When bell is rang by the poen we hear the sound bell and we know that t6he period is over in school.

-Answered by Himanshi Verma On 21 April 2019:10:44:41 AM


Question 188. Asked on :17 April 2019:10:16:39 AM

 WHY do kabaddi players rub their hands with the soil?

-Added by Rohit Rajput Science » Friction

Answer:

Himanshi Verma

 The kabaddi players rub their hands with the soil before the game start, because the soil increases the rough ness and hence the friction while catching the playerfirmly such that not to slip.

-Answered by Himanshi Verma On 21 April 2019:10:45:42 AM


Question 189. Asked on :17 April 2019:08:59:58 AM

 Define vibration. what is its other name?

-Added by Rohit Rajput Science » Sound

Answer:

Himanshi Verma

 A periodic motion of the particles of an elastic body or medium in alternately opposite directions from the position of equilibrium when that equilibrium has been disturbed (as when a stretched cord produces musical tones or molecules in the air transmit sounds to the ear)

-Answered by Himanshi Verma On 21 April 2019:10:50:16 AM


Question 190. Asked on :17 April 2019:08:58:35 AM

 Define plane.

-Added by Rohit Rajput Science » Light

Answer:

Himanshi Verma

 A flat surface on which a straight line joining any two points on it would wholly lie.

-Answered by Himanshi Verma On 21 April 2019:10:50:28 AM


Question 191. Asked on :17 April 2019:08:57:12 AM

 How many image, does one mirror from?

-Added by Rohit Rajput Science » Light

Answer:

Himanshi Verma

 Infinite images are formed by two parallel mirrors. But not many are seen as the light gets a little absorbed every time it reached and strikes the mirror.

-Answered by Himanshi Verma On 21 April 2019:10:51:18 AM


Question 192. Asked on :17 April 2019:08:55:55 AM

 What is virtual image?

-Added by Rohit Rajput Science » Light

Answer:

Himanshi Verma

 An optical image formed from the apparent divergence of light rays from a point, as opposed to an image formed from their actual divergence.

-Answered by Himanshi Verma On 21 April 2019:10:52:13 AM


Question 193. Asked on :17 April 2019:08:53:00 AM

 Define incident ray.


-Added by Rohit Rajput Science » Light

Answer:

Himanshi Verma
An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle ofincidence.

-Answered by Himanshi Verma On 21 April 2019:10:53:01 AM


Question 194. Asked on :15 April 2019:02:28:01 PM

Name the unit in which calorific  value of a fuel is expressed 

-Added by Sohail alam Science » Science

Answer:

priyanshu kumar

  The calorific value of fuel is the amount of heat produced by the complete combustion of 1 kg of fuel. Hence, the calorific value of the fuel is 40,000 kJ/kg.

-Answered by priyanshu kumar On 17 April 2019:08:56:27 AM


Question 195. Asked on :13 April 2019:03:39:27 PM

what do you mean by Virus

 

-Added by Sohail alam Science » Science

Answer:

Nitish kumar

 A computer virus is a malicious software program loaded onto a user's computer without the user's knowledge and performs malicious actions. ... It can self-replicate, inserting itself onto other programs or files, infecting them in the process. Not all computer viruses are destructive though

-Answered by Nitish kumar On 16 April 2019:08:27:07 AM


Question 196. Asked on :13 April 2019:03:32:32 PM

what is microorganism


 

-Added by Sohail alam Science » Science Questions

Answer:

priyanshu kumar

 A microscopic organism, especially a bacterium, virus, or fungus.

-Answered by priyanshu kumar On 17 April 2019:08:59:14 AM


Question 197. Asked on :09 April 2019:09:52:03 AM

 What are two modes by which animals reproduce?


-Added by Himanshi Verma Science » Reproduction In Animals

Answer:

Nitish kumar

  The different modes of asexual reproduction in animals include gemmules (sponges), fragmentation (planarians), regeneration (echinoderms) and parthenogenesis (ants, wasps).

-Answered by Nitish kumar On 15 April 2019:10:15:30 AM


Question 198. Asked on :09 April 2019:09:50:06 AM

 Does charcoal produce a flame on burning?

-Added by Himanshi Verma Science » Combustion And Flame `

Answer:

priyanshu kumar

  As David Curran correctly stated in his answer, charcoal can produce a flamewhen burning. However, charcoal frequently exhibits a non-flaming type ofcombustion. This is because flames only occur when combustion is occurring in the gas phase, (or if the combustion reaction is producing gas.)

-Answered by priyanshu kumar On 17 April 2019:09:01:29 AM


Question 199. Asked on :09 April 2019:09:48:11 AM

 Name a substance which burs itself in air.

-Added by Himanshi Verma Science » Combustion And Flame `

Answer:

priyanshu kumar

  CNG is a cleaner fuel. The substances which burn in air are called combustible. During the process of combustion, heat and light are given out.

-Answered by priyanshu kumar On 17 April 2019:09:03:22 AM


Question 200. Asked on :09 April 2019:09:46:19 AM

 

-Added by Prince Rawat Science » Crop Production And Maagement


Question 201. Asked on :09 April 2019:09:43:42 AM

 Name the bacterium present in the nodules of the roots pf leguminous plants which fixes atmosphere nitrogen.


-Added by Prince Rawat Science » Science

Answer:

Hitesh kumar

  Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia.

-Answered by Hitesh kumar On 20 April 2019:10:03:03 AM


Question 202. Asked on :09 April 2019:09:40:14 AM

 Name the chemical substances which are rich in a particular nutrient ? 

-Added by Prince Rawat Science » Crop Production And Management

Answer:

Himanshi Verma

 Carbon hydrogen oxygen potassium sulphur etc.

-Answered by Himanshi Verma On 15 April 2019:04:32:55 PM


Question 203. Asked on :29 March 2019:07:46:02 AM

 Q. what is irrigation ? Describe two methods of irrigation which conserve water :-


-Added by Krishna Verma Science » Crop Production And Management

Answer:

Himanshi Verma

 The process of watering the crops is called irrigationTwo methods of irrigationare: (i) Sprinkler system : This system is used on the uneven land where less wateris available. ... (ii) Drip irrigation: This system is used to save water as it allows the water to flow drop by drop at the roots of the plants.

-Answered by Himanshi Verma On 06 April 2019:06:42:21 PM


Question 204. Asked on :28 March 2019:05:13:59 PM

Why is sodium carbonate a main component of antacid?

-Added by Himanshi Verma Science » Acid Bases And Salts

Answer:

Nitish kumar

  Sodium Hydrogen carbonate is a main component of antacid because it is a basic substance which reacts with stomach’s acid HCl and neutralizes it.  

-Answered by Nitish kumar On 09 April 2019:09:29:13 AM


Question 205. Asked on :28 March 2019:05:10:49 PM

Why is respiration considered an exothermic reaction? Explain.

-Added by Rohit rajput Science » रासयिनिक अभिक्रियाए और समीकरण

Answer:

Himanshi Verma

 Respiration takes place in our body cells regularly. This is an exothermic reaction. After breaking down of obtained carbohydrate from food converts into glucose, which provides energy to our body combine with oxygen. Hence the exothermic reaction gives energy in very large quantity so the respiration is also called an exothermic reaction.

-Answered by Himanshi Verma On 28 March 2019:05:12:33 PM


Question 206. Asked on :28 March 2019:05:05:08 PM

 संतुलित रसायनिक समीकरण क्या है ? रसायनिक समीकरण को संतुलित करना क्यों आवश्यक है ?

-Added by Rohit rajput Science » रासयिनिक अभिक्रियाए और समीकरण

Answer:

Himanshi Verma

 जब अभिकारक और उत्पाद दोनों तरफ के प्रत्येक तत्व के परमाणुओं की संख्या समान हो तो ऐसे समीकरण को संतुलित रासायनिक समीकरण कहते है | द्रव्यमान संरक्षण के नियम को संतुष्ट करने के लिए रासायनिक समीकरण को संतुलित किया जाता है |

-Answered by Himanshi Verma On 28 March 2019:05:05:54 PM


Question 207. Asked on :28 March 2019:05:03:45 PM

 वायु में जलाने से पहले मैग्नीशियम रिबन को साफ क्यों किया जाता है ?

-Added by Rohit rajput Science » रासयिनिक अभिक्रियाए और समीकरण

Answer:

Himanshi Verma

वायु में जलाने से पहले मैग्नीशियम रिबन को साफ किया जाता है ताकि वह जलते समय पूरी तरह वायु के संपर्क में रहे | 


-Answered by Himanshi Verma On 28 March 2019:05:06:59 PM


Question 208. Asked on :28 March 2019:04:29:59 PM

 What is Newland's Law of Octaves and what is its limitation?

-Added by Himanshi Verma Science » Periodic Classification Of Elements

Answer:

Manisha kumari

 Every eighth element had properties similar to that of that first this law is known as Newland's Law of Octaves.                                                      Limitations of law of octavesThe law of octaveshas the following limitations ; (A) The law of octaves was found to be applicable only upto calcium. (B)It was not applicable to elements of higher atomic masses. (C) Newlands placed two elements in the same slot to fit elements in the table.

-Answered by Manisha kumari On 05 April 2019:04:47:09 PM


Question 209. Asked on :25 March 2019:03:59:09 PM

Q.what are microoorganism ?

-Added by Nishant verma Science » Science

Answer:

priyanshu kumar

 A microorganism is any living organism like bacteria, protozoa, or even fungi that cannot be seen with the naked eye. Microorganisms can only be viewed through a microscope and are extremely important to plant life, plant health, and soil composition.

-Answered by priyanshu kumar On 17 April 2019:08:55:24 AM


Question 210. Asked on :23 March 2019:04:35:20 PM

 Q. State difference between manure and fertilizer?

-Added by Shruti Srivastva Science » Science

Answer:

Himanshi Verma

 Fertiliser : 

1.) A fertiliser is an inorganic salt. 

2.) A fertiliser is prepared in factories. 

3.) A fertiliser does not provide any humus to the soil. 

4.) Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassium. 


Manure : 

1.) Manure is a natural substance obtained by the decomposition of cattle dung, human waste and plant residues. 

2.) Manure can be prepared in the fields. 

3.) Mqnure provides a lot of humus to the soil. 

4.) Manure is relatively less rich in plant nutrients. 

-Answered by Himanshi Verma On 25 March 2019:04:28:56 PM


Question 211. Asked on :23 March 2019:04:30:53 PM

 Q. 

-Added by Shruti Srivastva Science » Science


Question 212. Asked on :22 March 2019:04:56:00 PM

 What is Electromagnetic waves?

-Added by Rohit rajput Science » Physics

Answer:

Himanshi Verma

 The waves which do not require medium for their propagation i.e., which can propagate even through the vaccum are called electromagnetic waves.

Light radio waves, X- rays, etc are the examples of electromagnetic waves. These wave propagate with the velocity of light in vaccum.  

-Answered by Himanshi Verma On 23 March 2019:05:49:30 PM


Question 213. Asked on :22 March 2019:04:49:43 PM

 Who discovered Cathode Rays?

-Added by Himanshi Verma Science » Atomic

Answer:

Himanshi Verma

  Cathode ray was  discovered by sir William Crooke.

-Answered by Himanshi Verma On 23 March 2019:05:49:49 PM


Question 214. Asked on :22 March 2019:04:32:24 PM

 Why it is dangerous to sleep in an unventilated room with fair burning

-Added by Gunnaj sheikh Science » Chemistry

Answer:

Himanshi Verma

 It is dangerous to sleep in an inventilated room with fire burning inside because the fire produce carbon monoxide and carbon dioxide gases which are very harmful for us.

-Answered by Himanshi Verma On 22 March 2019:04:37:33 PM


Question 215. 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:

Himanshi Verma

  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 Himanshi Verma On 22 March 2019:04:27:50 PM


Question 216. 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 23 March 2019:05:50:05 PM


Question 217. 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 218. 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 219. 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 220. 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 221. 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 23 March 2019:05:59:51 PM


Question 222. 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 23 March 2019:06:00:08 PM


Question 223. 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 224. 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 225. 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 226. 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 227. 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 228. 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 229. Asked on :03 March 2019:01:53:36 PM

 अमेरिका मित्र राष्ट्र में कब शामिल हुआ ?

-Added by Himanshi Verma Science » History

Answer:

Gunnaj sheikh

 In 1917.

-Answered by Gunnaj sheikh On 23 March 2019:06:00:20 PM


Question 230. 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:

Himanshi Verma

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

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 Himanshi Verma On 22 March 2019:05:03:50 PM


Question 231. 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 232. 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 23 March 2019:05:51:19 PM


Question 233. 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 234. Asked on :22 February 2019:02:09:09 PM

 Write the boiling point of distilled water

-Added by Himanshi Verma Science » Matter

Answer:

Himanshi Verma

  100 degre celcius

-Answered by Himanshi Verma On 22 March 2019:04:15:00 PM


Question 235. 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 236. 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 237. 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 238. 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 239. 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 240. 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 241. 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 242. 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 243. 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 244. 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 245. 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 246. 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 247. 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 248. 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 249. 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 250. 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 251. 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 252. 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 253. 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 254. 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 255. 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 256. 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 257. 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 258. 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 259. 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 260. 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 261. 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 262. 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 263. 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 264. 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 265. 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 266. 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 267. 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 268. 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 269. 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 270. 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 271. 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 272. 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 273. 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 274. 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 275. 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 276. 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 277. 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 278. 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 279. 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 280. 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 281. 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 282. 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 283. 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 284. 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 285. 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 286. 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 287. 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 288. 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 289. 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 290. 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 291. 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 292. 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 293. 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 294. 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 295. 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 296. 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 297. 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 298. 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 299. 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 300. 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 301. 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 302. 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 303. 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 304. 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 305. 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 306. 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 307. 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 308. 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 309. 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 310. 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 311. 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 312. 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 313. 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 314. 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 315. 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 316. 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 317. 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 318. 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 319. 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 320. 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 321. 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 322. 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 323. 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 324. 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 325. 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 326. Asked on :14 January 2019:05:08:10 PM

 

-Added by Himanshi Verma Science » Matter Around Us


Question 327. 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 328. 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 329. 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 330. 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 331. 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 332. 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 333. 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 334. 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 335. 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 336. 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 337. 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 338. 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 339. 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 340. 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 341. 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 342. 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 343. 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 344. 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 345. 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 346. 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 347. 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 348. 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 349. 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 350. 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 351. 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 352. 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 353. 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 354. 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 355. 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 356. 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 357. 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 358. 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 359. 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 360. 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 361. 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 362. 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 363. 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 364. 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 365. 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 366. 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 367. 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 368. 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 369. 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 370. 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 371. 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 372. 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 373. 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 374. 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 375. 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 376. 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 377. 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 378. 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 379. 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 380. 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 381. Asked on :30 December 2018:09:33:16 AM

What is common in all acids?

-Added by Pawan Kumar Science » Acid Base Salt

Answer:

Himanshi Verma

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

-Answered by Himanshi Verma On 23 March 2019:05:35:31 PM


Question 382. Asked on :30 December 2018:12:07:49 AM

What is different between Ameter and galvanometer?

-Added by Master Purushottam Science » Electricity

Answer:

Himanshi Verma

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

-Answered by Himanshi Verma On 23 March 2019:05:35:46 PM


Question 383. Asked on :29 December 2018:02:15:17 AM

आपेक्षित घनत्व का मात्रक क्या होता है?

-Added by Apurva Institute Science » घनत्व

Answer:

Himanshi Verma

  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 Himanshi Verma On 23 March 2019:05:35:59 PM


Question 384. Asked on :29 December 2018:01:35:07 AM

What is galvanometer?

-Added by Apurva Institute Science » Electricity

Answer:

Himanshi Verma

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

-Answered by Himanshi Verma On 23 March 2019:05:36:12 PM


Question 385. 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:

Himanshi Verma

 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 Himanshi Verma On 23 March 2019:05:36:54 PM


Question 386. 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:

Himanshi Verma

  Ernest Rutherford discovered the nucleus of an atom

-Answered by Himanshi Verma On 23 March 2019:05:34:13 PM


Question 387. Asked on :26 December 2018

Why cell is called structural and functional unit of body?

-Added by shyam Babu Science » cell

Answer:

Hitesh kumar

  Cells are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells.

-Answered by Hitesh kumar On 22 April 2019:08:00:48 AM


 

You can see here all the solutions of this question by various user for NCERT Solutions. We hope this try will help you in your study and performance.

This Solution may be usefull for your practice and CBSE Exams or All label exams of secondory examination. These solutions or answers are user based solution which may be or not may be by expert but you have to use this at your own understanding of your syllabus.

 

 

Search your Question Or Keywords

 

 

All Tags by Subjects: