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Asked/Added Questions From NCERT: Science


Question 1. Asked on :16 September 2019:10:18:12 AM

 What is chemical reaction?

-Added by Aarohi Chauhan Science » Chemical Reactions

Answer:

Aarohi Chauhan

process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

-Answered by Aarohi Chauhan On 16 September 2019:10:22:10 AM


Question 2. Asked on :16 September 2019:10:13:21 AM

 परिनालिका क्या होती है ?

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

Answer:

Akki chauhan

परिनालिका की परिभाषा है :- जब किसी चीनी मिट्टी से बनी बेलनाकार नलिका जिसकी लम्बाई अधिक हो तथा त्रिज्या बहुत कम हो , पर ताँबे का तार लपेटा जाता है इस व्यवस्था को परिनालिका कहते है।


-Answered by Akki chauhan On 17 September 2019:10:13:54 AM


Question 3. Asked on :16 September 2019:10:09:19 AM

 What is diffusion?

-Added by Aarohi Chauhan Science » Life Processes

Answer:

Akki chauhan
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Diffusion is an important process for living things; it is how substances move in and out of cells.

-Answered by Akki chauhan On 17 September 2019:10:15:13 AM


Question 4. Asked on :15 September 2019:09:47:39 PM

State third law of motion along with suitable example.

-Added by Khushi Chauhan Science » Science

Answer:

Akki chauhan

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

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


-Answered by Akki chauhan On 17 September 2019:10:15:59 AM


Question 5. Asked on :15 September 2019:12:17:06 PM

 Write the ways of saving fossil fuels.

-Added by Himanshi Verma Science » Sources Of Energy

Answer:

Rohit Rajput

1. Walking short distances.

2. Where possible switch off unneccessary light 

3.  Use of efficient appliances.

4. Use of public transport 

5. Repair of faulty water taps.

6. Promotion of solar energy.


-Answered by Rohit Rajput On 15 September 2019:12:50:50 PM


Question 6. Asked on :15 September 2019:12:14:09 PM

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

-Added by Himanshi Verma Science » Environment

Answer:

Himanshi Verma

 1. Variation helps in survival of individual

2. Sexual reproduction results in variation.

3. Adaptation and natural selection.

-Answered by Himanshi Verma On 15 September 2019:12:16:11 PM


Question 7. Asked on :15 September 2019:12:12:24 PM

 What is the full form of STD?

-Added by Himanshi Verma Science » G.k

Answer:

Rohit Rajput
Sexually Transmitted Diseases.

-Answered by Rohit Rajput On 15 September 2019:12:51:34 PM


Question 8. Asked on :15 September 2019:11:06:10 AM

What is Electric Power?

-Added by Akki chauhan Science » Electricity

Answer:

Akki chauhan
The rate of doing work is Power. 

p=V×I

-Answered by Akki chauhan On 15 September 2019:11:06:40 AM


Question 9. Asked on :15 September 2019:11:05:38 AM

What is Unit?


-Added by Akki chauhan Science » Electicity

Answer:

Akki chauhan
The Commercial unit of Electrical energy is Unit.

Commercial unit= 1KWH.

-Answered by Akki chauhan On 15 September 2019:11:07:41 AM


Question 10. Asked on :15 September 2019:11:05:07 AM

Define 1 watt.

-Added by Akki chauhan Science » Electricity

Answer:

Akki chauhan
1 Watt = 1 Volt × 1 Ampere.

-Answered by Akki chauhan On 15 September 2019:11:09:32 AM


Question 11. Asked on :14 September 2019:10:24:39 AM

 What is electrolytic decomposition?

-Added by Himanshi Verma Science » Acid Base Salt

Answer:

Akki chauhan
When electricity is passed through a molten compound which is ionic in nature, then the ions of the compound which is ionic in nature, then the ions of the compound separate into its component, thereby decomposing the compond. It is used in separating hydrogen and oxygen gas from water. It is also used to seprate gases or elements

-Answered by Akki chauhan On 14 September 2019:12:42:10 PM


Question 12. Asked on :13 September 2019:05:55:16 PM

 Who was discovered fermentation and when?

-Added by Pragya🥰 Choudhary Science » General Knowledge

Answer:

Akki chauhan
Fermentation is the process of conversion of sugar into alcohol. The scientist who discovered fermentation was Louis Pasteur in 1857.

-Answered by Akki chauhan On 13 September 2019:07:06:03 PM


Question 13. Asked on :13 September 2019:08:00:24 AM

 What is antibiotic 

-Added by Shruti Srivastva Science » Science

Answer:

Akki chauhan
 The medicine that kill or stop the growth of disease causing microorganisms called antibiotic 

-Answered by Akki chauhan On 13 September 2019:09:21:39 AM


Question 14. Asked on :13 September 2019:07:55:17 AM

 What is antiseptic 

-Added by Shruti Srivastva Science » Science

Answer:

Akki chauhan
 Medicine 

-Answered by Akki chauhan On 13 September 2019:09:23:07 AM


Question 15. Asked on :11 September 2019:07:08:17 PM

Expain the process of nitrogen cycle. 

-Added by Pragya🥰 Choudhary Science » Atmospheric Nitrogen

Answer:

Akki chauhan

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphereterrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixationammonificationnitrification, and denitrification. The majority of Earth's atmosphere (78%) is atmosphere nitrogen,[16] making it the largest source of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems.

The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.[17][18][19] Human modification of global nitrogen cycle can negatively affect the natural environment system and also human health

-Answered by Akki chauhan On 13 September 2019:09:56:09 AM


Question 16. Asked on :11 September 2019:11:23:02 AM

Write the symbol of Phosporus.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 P is the symbol of phosphorous 


-Answered by Shruti Srivastva On 11 September 2019:09:00:39 PM


Question 17. Asked on :11 September 2019:11:21:34 AM

Write the symbol of Silicon.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 Si is the symbol of of silicon

-Answered by Shruti Srivastva On 11 September 2019:09:01:45 PM


Question 18. Asked on :11 September 2019:11:19:33 AM

Write the symbol of Aluminium.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 All is the symbol of aluminium 


-Answered by Shruti Srivastva On 11 September 2019:09:02:58 PM


Question 19. Asked on :11 September 2019:11:18:42 AM

Write the symbol of Magnesium.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 Mg is the symbol of magnesium 

-Answered by Shruti Srivastva On 11 September 2019:09:04:16 PM


Question 20. Asked on :11 September 2019:11:18:04 AM

Write the symbol of Sodium.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 Na is the symbol of sodium 

-Answered by Shruti Srivastva On 11 September 2019:09:05:18 PM


Question 21. Asked on :11 September 2019:11:17:38 AM

Write the symbol of Neon.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 Ne is the symbol of neon

-Answered by Shruti Srivastva On 11 September 2019:09:06:16 PM


Question 22. Asked on :11 September 2019:11:11:45 AM

Write the symbol of Fluorine.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 F is the symbol 

-Answered by Shruti Srivastva On 11 September 2019:09:07:07 PM


Question 23. Asked on :11 September 2019:11:11:05 AM

Write the symbol of Oxygen.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 Answer is o2

-Answered by Shruti Srivastva On 11 September 2019:09:08:13 PM


Question 24. Asked on :11 September 2019:11:09:33 AM

Write the symbol of Nitrogen?

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 N is the symbol of nitrogen 

-Answered by Shruti Srivastva On 11 September 2019:09:09:05 PM


Question 25. Asked on :11 September 2019:11:06:56 AM

Write the symbol of Carbon.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 c is the symbol of carbon 

-Answered by Shruti Srivastva On 11 September 2019:09:11:50 PM


Question 26. Asked on :11 September 2019:11:06:24 AM

Write the symbol of Boron?

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 B is the symbol of boron 

-Answered by Shruti Srivastva On 11 September 2019:09:13:01 PM


Question 27. Asked on :11 September 2019:11:00:44 AM

Write the symbol of Beryllium?

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Shruti Srivastva

 Be is the answer 

-Answered by Shruti Srivastva On 11 September 2019:09:14:16 PM


Question 28. Asked on :11 September 2019:10:59:43 AM

Write the symbol of Lethium.

-Added by Akki chauhan Science » Periodic Classification Of Elements

Answer:

Akki chauhan
Li.

-Answered by Akki chauhan On 11 September 2019:11:01:43 AM


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

Kapde kitne Prakar ke deshon se banae Jaate Hai?

-Added by priyanshu kumar Science » Translation Aur Plastic

Answer:

Akki chauhan
There are two main types of fabrics: natural and synthetic. Natural fabrics such as wool, cotton, silk, and linen are made from animal coats, cotton-plant seed pods, fibers from silkworms, and flax (fiber from the stalk of a plant), respectively.

-Answered by Akki chauhan On 11 September 2019:11:17:11 AM


Question 30. Asked on :11 September 2019:10:24:49 AM

 Sukshm Jeev ko kis yantra ki sahayata Se Dekha Ja sakta hai?

-Added by priyanshu kumar Science » Sukshm Jeev Mitra AVM Shatru

Answer:

priyanshu kumar

 Sukshm Darshi

-Answered by priyanshu kumar On 11 September 2019:10:25:57 AM


Question 31. Asked on :11 September 2019:10:16:21 AM

 East kis Prakar ka sukshm Jeev hai?

-Added by priyanshu kumar Science » Sukhdham Mitra AVM Shatru

Answer:

priyanshu kumar

 Kavak

-Answered by priyanshu kumar On 11 September 2019:10:18:44 AM


Question 32. Asked on :10 September 2019:10:29:57 AM

 What is the function of Placenta?

-Added by Himanshi Verma Science » Placenta

Answer:

Akki chauhan
It provides a large surface area for nutrients/ glucose and oxygen to pass from the mother's side to the embryo and waste substances from the embryo's side to the mothers blood.

-Answered by Akki chauhan On 11 September 2019:11:33:05 AM


Question 33. Asked on :10 September 2019:10:26:44 AM

 Why are the coils of electric toaster made of an alloy rather than a pure metal?

-Added by Himanshi Verma Science » Magnetic Effects Of Electricity

Answer:

Akki chauhan
Alloys have higher resistivity and do not oxidise or burn readily at high tempratures.

-Answered by Akki chauhan On 11 September 2019:11:33:15 AM


Question 34. Asked on :10 September 2019:10:22:34 AM

What is tetravalency?

-Added by Himanshi Verma Science » Carbon And Its Compound

Answer:

Akki chauhan
Since carbon has a valency of 4, so it is capable of bonding with four others atoms of carbon or atom of elements like oxygen, hydrogen, nitrogen, sulphur, chlorine, etc.

-Answered by Akki chauhan On 11 September 2019:11:33:29 AM


Question 35. Asked on :10 September 2019:10:18:57 AM

What is the reason for the formation of strong bonds by carbon?

-Added by Himanshi Verma Science » Carbon And Its Compound

Answer:

Akki chauhan

 The reason for the formation of strong bonds by carbon is due to its small size, which enables the nucleus to hold on to the shared pair of electrons strongly.


-Answered by Akki chauhan On 11 September 2019:11:33:45 AM


Question 36. Asked on :10 September 2019:10:15:29 AM

 When does concave mirror form a virtual image?

-Added by Himanshi Verma Science » Light

Answer:

Akki chauhan
Concave mirror will form a virtual image when the object between pole and the focus.

-Answered by Akki chauhan On 11 September 2019:11:34:49 AM


Question 37. Asked on :10 September 2019:10:11:39 AM

 How will you test in the laboratory, whether the given sample of water is hard or soft?

-Added by Himanshi Verma Science » Acid Base Salt

Answer:

Akki chauhan
When few drops of soap solution are added in the given sample of water, if lather is formed with soap then water is soft water. If lather is not formed then water is hard.

-Answered by Akki chauhan On 11 September 2019:11:35:02 AM


Question 38. Asked on :10 September 2019:10:09:06 AM

 How does guard cells help in opening of stomata?

-Added by Himanshi Verma Science » Life Processes

Answer:

Akki chauhan
Guard cells are bean shaped cells which on swelling opens the pore.

-Answered by Akki chauhan On 11 September 2019:11:36:02 AM


Question 39. Asked on :10 September 2019:10:07:04 AM

 What are the conditions for observing a rainbow?

-Added by Himanshi Verma Science » Light

Answer:

Akki chauhan

1. The sun should shine brightly after rainfall.

2. Sun should be at the back of the observer.

-Answered by Akki chauhan On 11 September 2019:11:36:12 AM


Question 40. Asked on :10 September 2019:10:04:17 AM

 What is the cause of dispersion of light?

-Added by Himanshi Verma Science » Light And Reflection

Answer:

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

-Answered by Akki chauhan On 11 September 2019:11:36:57 AM


Question 41. Asked on :10 September 2019:10:01:49 AM

 What is dispersion of white  light?

-Added by Himanshi Verma Science » Light And Reflection

Answer:

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

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


Question 42. Asked on :10 September 2019:09:58:23 AM

 What is homologous series?

-Added by Himanshi Verma Science » Chemical Compoud

Answer:

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

-Answered by Akki chauhan On 11 September 2019:11:37:34 AM


Question 43. Asked on :10 September 2019:09:54:42 AM

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

-Added by Himanshi Verma Science » Control And Coordination

Answer:

Akki chauhan

 1. Variation helps in survival of individuals

2. Sexual reproduction results in variation.

3. Adaptation and natural selection.

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


Question 44. Asked on :10 September 2019:09:51:37 AM

 What is stomata? Give two functions of stomata.

-Added by Himanshi Verma Science » Life Process

Answer:

Akki chauhan
The tiny pores or openings present under the leaves of the plants is called stomataTwo functions of stomata:                                                                                                                                  (i) It helps in breathing of the plants.                                                                                                               (ii) It helps in exchange of gases which takes place inside the plant cells.

-Answered by Akki chauhan On 11 September 2019:11:38:01 AM


Question 45. Asked on :10 September 2019:09:49:14 AM

 What is implantation?

-Added by Himanshi Verma Science » Life Processes

Answer:

Akki chauhan
The phenomenon in which zygote fixes itself on the inner thick wall of uteres, for further development is called implantation.

-Answered by Akki chauhan On 11 September 2019:11:38:17 AM


Question 46. Asked on :10 September 2019:09:47:41 AM

 Which pancreatic enzyme is effective in digestion of proteins?

-Added by Himanshi Verma Science » Control And Coordination

Answer:

Akki chauhan

Pancreatic trypsin.

-Answered by Akki chauhan On 11 September 2019:11:39:56 AM


Question 47. Asked on :10 September 2019:09:45:04 AM

 Give an example of photochemical reaction.

-Added by Himanshi Verma Science » Control And Coordination

Answer:

Akki chauhan

  In black and white photography, photons of light breaks the bond of AgBr to form Ag and bromine.

-Answered by Akki chauhan On 11 September 2019:11:40:08 AM


Question 48. Asked on :10 September 2019:09:40:32 AM

 What is reactivity series?

-Added by Himanshi Verma Science » Electricity

Answer:

Akki chauhan

  The arrangement of metals in the vertical column in the order of decreasing reactivity is called reactivity series.

-Answered by Akki chauhan On 11 September 2019:11:40:17 AM


Question 49. Asked on :10 September 2019:09:35:54 AM

 Explain two ways by which age of fossil fuels can be estimated?

-Added by Himanshi Verma Science » Sources Of Energy

Answer:

Akki chauhan

  1. Relative method- fossils found closer to the surface are more recent than those in deeper layer.

2. By detecting the ratios of different isotopes of the same element in the fossil materials.

-Answered by Akki chauhan On 11 September 2019:11:40:21 AM


Question 50. Asked on :10 September 2019:09:32:19 AM

 Why are fossils considered important in the study of evolution?

-Added by Himanshi Verma Science » Sources Of Energy

Answer:

Nishant Verma
 fossil fuels provide evidence in favour of evolution evolutionary relationship by providing missing links.

-Answered by Nishant Verma On 10 September 2019:09:59:19 AM


Question 51. Asked on :10 September 2019:09:28:56 AM

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

-Added by Himanshi Verma Science » Acid Base Salt

Answer:

Nishant Verma
In the electrolysis of water, the gas collected at cathode is hydrogen and the gas collected at anode is hydrogen.

-Answered by Nishant Verma On 10 September 2019:09:35:05 AM


Question 52. Asked on :10 September 2019:09:26:24 AM

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

-Added by Himanshi Verma Science » Sources Of Energy

Answer:

Akki chauhan

i) Our demand for energy is increasing to improve quality of life and growth of population

ii) Fossil fuels are limited

-Answered by Akki chauhan On 11 September 2019:11:45:55 AM


Question 53. Asked on :10 September 2019:09:25:21 AM

 Name two unisexual flowers?

-Added by Himanshi Verma Science » Flowers

Answer:

Nishant Verma
 Papaya and watermelon.

-Answered by Nishant Verma On 10 September 2019:09:35:43 AM


Question 54. Asked on :08 September 2019:11:01:13 AM

Why should curd and sour substances not be kept in brass and copper vessels?

-Added by Akki chauhan Science » Acid Base Salt

Answer:

Akki chauhan
Curd and other sour substances contain acids, Therefore when they are kept brass and copper vessels, the metals react with acid. To liberate hydrogen gas and harmful products, thereby spoiling the food. 

-Answered by Akki chauhan On 08 September 2019:11:02:57 AM


Question 55. Asked on :07 September 2019:08:49:15 AM

Write the dieseas caused by virus

-Added by Sohail alam Science » Microorganism Friend And Foe

Answer:

Akki chauhan
Polio, Hepatitis A, Measles and Chickenpox. 

-Answered by Akki chauhan On 13 September 2019:09:39:27 AM


Question 56. Asked on :06 September 2019:08:01:31 PM

 What is malleability?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput
Some metals can be beaten into thin sheets. This property of metals is called malleability.

-Answered by Rohit Rajput On 06 September 2019:08:29:51 PM


Question 57. Asked on :06 September 2019:07:57:59 PM

 Write the three allotropes of carbon.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

1. Diamond

2. Graphite

3. Buckminsterfullerenc

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


Question 58. Asked on :06 September 2019:07:55:02 PM

 What is anodising?

-Added by Himanshi Verma Science » Metals And Nonmetal

Answer:

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

-Answered by Akki chauhan On 06 September 2019:08:00:31 PM


Question 59. Asked on :06 September 2019:07:53:25 PM

 What is ores?.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

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

-Answered by Rohit Rajput On 06 September 2019:08:35:22 PM


Question 60. Asked on :06 September 2019:07:51:54 PM

 What is gangue?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

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

-Answered by Rohit Rajput On 06 September 2019:08:37:27 PM


Question 61. Asked on :06 September 2019:07:50:34 PM

 What is minerals?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput
The elements or compounds which  occur naturally in the earth crust is called minerals. 

-Answered by Rohit Rajput On 06 September 2019:08:36:36 PM


Question 62. Asked on :06 September 2019:07:47:14 PM

 What is roasting?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

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

-Answered by Akki chauhan On 06 September 2019:08:01:48 PM


Question 63. Asked on :06 September 2019:03:51:50 PM

 The main use of petrol is________ .

-Added by Shruti Srivastva Science » Science

Answer:

Akki chauhan
in vehicle.

-Answered by Akki chauhan On 06 September 2019:08:26:07 PM


Question 64. Asked on :06 September 2019:03:50:38 PM

 What is petroleum refinery?

-Added by Shruti Srivastva Science » Science

Answer:

Akki chauhan
Petroleum refining processes

Description

Petroleum refining processes are the chemical engineering processes and other facilities used in petroleum refineries to transform crude oil into useful products such as liquefied petroleum gas, gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils.

-Answered by Akki chauhan On 06 September 2019:08:26:17 PM


Question 65. Asked on :06 September 2019:03:49:57 PM

 What is petroleum?

-Added by Shruti Srivastva Science » Science

Answer:

Master Purushottam
Petroleum

Description

Petroleum is a naturally occurring, yellowish-black liquid found in geological formations beneath the Earth's surface. It is commonly refined into various types of fuels.

-Answered by Master Purushottam On 06 September 2019:06:22:37 PM


Question 66. Asked on :06 September 2019:03:46:58 PM

 How petroleum is formed?

-Added by Shruti Srivastva Science » Science

Answer:

Master Purushottam
A fossil fuel, petroleum is formed when large quantities of dead organisms, mostly zooplankton and algae, are buried underneath sedimentary rock and subjected to both intense heat and pressure. Petroleum has mostly been recovered by oil drilling (natural petroleum springs are rare).

-Answered by Master Purushottam On 06 September 2019:06:25:07 PM


Question 67. Asked on :06 September 2019:03:44:39 PM

 What is petrochemicals?

-Added by Pragya🥰 Choudhary Science » Vlothes

Answer:

Akki chauhan
Petrochemical

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

-Answered by Akki chauhan On 06 September 2019:08:03:36 PM


Question 68. Asked on :06 September 2019:03:43:24 PM

 Give 4 uses of Coal tar.

-Added by Pragya🥰 Choudhary Science » Petroleum

Answer:

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

-Answered by Akki chauhan On 06 September 2019:08:03:46 PM


Question 69. Asked on :06 September 2019:03:43:40 PM

 Write one use of coal tar?

-Added by Shruti Srivastva Science » Science

Answer:

Akki chauhan
Coal tar are used in starting material for various substance.

-Answered by Akki chauhan On 06 September 2019:08:03:58 PM


Question 70. Asked on :06 September 2019:03:42:20 PM

 Explain What is Global Warming ?

-Added by Pragya🥰 Choudhary Science » Global Warming

Answer:

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

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


Question 71. Asked on :06 September 2019:03:41:34 PM

 How can we control or save petrol?

-Added by Pragya🥰 Choudhary Science » Petroleum

Answer:

Master Purushottam
15 Ways to Save Fuel
  1. Avoid Long Idling. ...
  2. Clean Out the Trunk and Eliminate Unnecessary Weight. ...
  3. Keep Tires Inflated to the Correct Pressure. ...
  4. Don't Buy Premium Fuel. ...
  5. Encourage Drivers to Observe Posted Speed Limits. ...
  6. Shop Around for Best Fuel Prices. ...
  7. 7. Make Drivers Energy Conscious. ...
  8. Use Air Conditioning Sparingly.

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


Question 72. Asked on :06 September 2019:03:40:17 PM

 Explain the process of formation of Petroleum.

-Added by Pragya🥰 Choudhary Science » Petroleum

Answer:

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

-Answered by Akki chauhan On 06 September 2019:08:05:36 PM


Question 73. Asked on :06 September 2019:03:39:21 PM

 What is pressure?

-Added by Pragya🥰 Choudhary Science » Force And Pressure

Answer:

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

-Answered by Akki chauhan On 06 September 2019:08:05:59 PM


Question 74. Asked on :06 September 2019:03:37:18 PM

 What precaution must be taken while taking Streptomycin?

-Added by Pragya🥰 Choudhary Science » Micro -organisms

Answer:

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

-Answered by Master Purushottam On 06 September 2019:06:28:01 PM


Question 75. Asked on :06 September 2019:03:37:16 PM

 Name things get from coal?

-Added by Shruti Srivastva Science » Science

Answer:

Akki chauhan
Coal tar.

-Answered by Akki chauhan On 06 September 2019:08:06:35 PM


Question 76. Asked on :06 September 2019:03:33:58 PM

 What is carbonisation?

-Added by Shruti Srivastva Science » Science

Answer:

Akki chauhan
The slows process of converson od dead vegetation into coal is called carbonisation.

-Answered by Akki chauhan On 06 September 2019:08:09:00 PM


Question 77. Asked on :06 September 2019:03:24:06 PM

 Write one use of coal?

-Added by Shruti Srivastva Science » Science

Answer:

Akki chauhan

 for making fuel.

-Answered by Akki chauhan On 06 September 2019:08:10:46 PM


Question 78. Asked on :06 September 2019:01:23:42 PM

 Define ossilation?

-Added by Suman Kumari Science » Science

Answer:

Nishant Verma
This movement of energy between the two forms is what causes the oscillation. Eventually, any physical oscillator stops moving because of friction. To keep it going, you have to add a little bit of energy on each cycle. In a pendulum clock, the energy that keeps the pendulum moving comes from the spring.

-Answered by Nishant Verma On 06 September 2019:02:52:56 PM


Question 79. Asked on :06 September 2019:01:22:42 PM

 What is simple pendulum?

-Added by Suman Kumari Science » Science

Answer:

Nishant Verma
Pendulum

Description

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 Nishant Verma On 06 September 2019:02:53:46 PM


Question 80. Asked on :06 September 2019:01:20:36 PM

 Write the basic unit of speed? 

-Added by Suman Kumari Science » Science

Answer:

Nishant Verma
Meter/second.

-Answered by Nishant Verma On 06 September 2019:02:50:18 PM


Question 81. Asked on :06 September 2019:01:16:15 PM

 Write the basic unit of time?

-Added by Suman Kumari Science » Science

Answer:

Nishant Verma
 Second. 

-Answered by Nishant Verma On 06 September 2019:02:50:32 PM


Question 82. Asked on :05 September 2019:10:46:52 PM

 Which teeth is used for cutting.


-Added by Shruti Srivastva Science » Science

Answer:

Master Purushottam

Incisor 


-Answered by Master Purushottam On 06 September 2019:06:43:55 PM


Question 83. Asked on :05 September 2019:05:38:41 PM

 What are shearing?

-Added by Suman Kumari Science » Science

Answer:

Nishant Verma
Shearing (physics) From Wikipedia, the free encyclopedia. Shearing in continuum mechanics refers to the occurrence of a shear strain, which is a deformation of a material substance in which parallel internal surfaces slide past one another. It is induced by a shear stress in the material

-Answered by Nishant Verma On 05 September 2019:05:41:30 PM


Question 84. Asked on :05 September 2019:05:32:41 PM

 What are rearing?

-Added by Suman Kumari Science » Science

Answer:

Harshita Rathore
Rearing of sheep means to look after the sheep by providing them food, shelter and health care. breeding is done to obtain animals with desired characters . ... these are then crossed [ made to reproduce ] to obtain new breed of the animals having desirable characters of both parents . this is called