Asked/Added Questions From NCERT: Science


Question 1. 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


Question 2. 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 3. 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


Question 4. Asked on :16 January 2019:05:40:29 PM

 what is kerogen oil?


-Added by Himanshi Verma Science » G.k


Question 5. 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


Question 6. 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 16 January 2019:05:14:13 PM


Question 7. 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 8. 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:

Nitish kumar

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

-Answered by Nitish kumar On 17 January 2019:10:11:05 AM


Question 9. 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


Question 10. 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 11. 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 12. Asked on :15 January 2019:09:47:53 AM

 What is electro magnet.

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

Answer:

Nitish kumar

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 Nitish kumar On 17 January 2019:10:23:56 AM


Question 13. 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 14. 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 15. Asked on :14 January 2019:05:08:10 PM

 

-Added by Himanshi Verma Science » Matter Around Us


Question 16. 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 17. 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 18. 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


Question 19. 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 20. 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 21. 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 22. 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 23. 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 24. 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 25. 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 26. 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 27. 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 28. 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 29. 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 30. Asked on :12 January 2019:05:24:29 PM

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


Question 31. 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 32. 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 33. 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 34. 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 35. 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 36. Asked on :12 January 2019:10:59:35 AM

-Added by Akki chauhan Science » Atom And Molecules


Question 37. 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 38. 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 39. 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 40. 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 41. 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 42. 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 43. 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 44. 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 45. 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 46. 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 47. 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 48. 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 49. 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 50. 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 51. 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 52. 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 53. 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 54. 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 55. 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 56. 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 57. 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 58. 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 59. 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 60. Asked on :09 January 2019:10:25:19 AM

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


Question 61. 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 62. 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 63. 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 64. 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 65. 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 66. 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 67. 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:

Akki chauhan

  

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 Akki chauhan On 15 January 2019:08:39:38 AM


Question 68. 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 69. 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 70. Asked on :30 December 2018:09:33:16 AM

What is common in all acids?

-Added by Pawan Kumar Science » Acid Base Salt

Answer:

Akki chauhan

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

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


Question 71. Asked on :30 December 2018:12:07:49 AM

What is different between Ameter and galvanometer?

-Added by Master Purushottam Science » Electricity

Answer:

Akki chauhan

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

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


Question 72. Asked on :29 December 2018:02:15:17 AM

आपेक्षित घनत्व का मात्रक क्या होता है?

-Added by Apurva Institute Science » घनत्व

Answer:

Akki chauhan

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

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

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

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


Question 73. Asked on :29 December 2018:01:35:07 AM

What is galvanometer?

-Added by Apurva Institute Science » Electricity

Answer:

Akki chauhan

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

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


Question 74. Asked on :28 December 2018:10:59:05 PM

What are the various uses of concave mirror?

-Added by ATP Admin Science » Light and Reflection

Answer:

Akki chauhan

 Use of cancave mirror; 

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

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

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

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

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


Question 75. Asked on :27 December 2018:03:52:45 PM

Who discovered the nucleus of an Atom?

-Added by ATP Admin Science » Atom and Its Structure

Answer:

Akki chauhan

 Ernest Rutherford discovered the nucleus of an atom

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


Question 76. Asked on :26 December 2018

Why cell is called structural and functional unit of body?

-Added by shyam Babu Science » cell

Answer:

Himanshi Verma

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

-Answered by Himanshi Verma On 16 January 2019:06:00:32 PM


 

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