general science

Physics MCQ Questions and Answers Page - 4

1.

A falling droop of rain water acquires the spherical shape due to

Answer/ Hint      

Answer : B

Explanation :

2.

The weakest of all fundamental forces is

Answer/ Hint      

Answer : A

Explanation :

3.

Velocity of sound in air does not change with the change of

Answer/ Hint      

Answer : B

Explanation :

4.

The cause for the Tsunami, as deduced by the seismologists, is

Answer/ Hint      

Answer : C

Explanation :

5.

Why is it difficult to breathe at higher altitudes ?

Answer/ Hint      

Answer : A

Explanation :

6.

The strongest force in nature is

Answer/ Hint      

Answer : C

Explanation :

7.

When a body is taken from earth to moon

Answer/ Hint      

Answer : B

Explanation :

8.

It is difficult to cook rice

Answer/ Hint      

Answer : A

Explanation :

9.

Fog is an example of

Answer/ Hint      

Answer : B

Explanation :

10.

The modulus of rigidity is the ratio of

Answer/ Hint      

Answer : C

Explanation :

11.

The propagation of sound waves in a gas involves

Answer/ Hint      

Answer : A

Explanation :

12.

In which of the following processes is energy released ?

Answer/ Hint      

Answer : A

Explanation :

13.

The bats can fly in the dark because

Answer/ Hint      

Answer : D

Explanation :

14.

What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?

Answer/ Hint      

Answer : C

Explanation :

15.

Angle of friction and angle of repose are

Answer/ Hint      

Answer : A

Explanation :

16.

Cloudy nights are warmer compared to clear nights, because clouds mainly

Answer/ Hint      

Answer : C

Explanation :

17.

The frequency of ultrasound wave is typically

Answer/ Hint      

Answer : C

Explanation :

18.

The function of ball bearings in a wheel is :

Answer/ Hint      

Answer : B

Explanation :

19.

‘shock-absorbers’ are usually made of steel as it :

Answer/ Hint      

Answer : C

Explanation :

20.

Among the following materials sound travels fastest in

Answer/ Hint      

Answer : A

Explanation :

21.

Lakes freeze in cold countries in winter, leaving the water underneath at

Answer/ Hint      

Answer : C

Explanation :

22.

A spherical ball made of steel when dropped in mercury container will

Answer/ Hint      

Answer : B

Explanation :

23.

The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as

Answer/ Hint      

Answer : A

Explanation :

24.

When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :

Answer/ Hint      

Answer : C

Explanation :

25.

Light houses are places with powerful lights to :

Answer/ Hint      

Answer : D

Explanation :

26.

A piece of wood is held under water. The up thrust on it will be :

Answer/ Hint      

Answer : B

Explanation :

27.

The distance between node and adjacent antinode is 30 cm. The wavelength is

Answer/ Hint      

Answer : D

Explanation :

28.

In a railway track, two rails are joined end to end with a gap in between them because

Answer/ Hint      

Answer : D

Explanation :

29.

Vehicle tyres are inflated properly

Answer/ Hint      

Answer : C

Explanation :

30.

Refrigeration is a process which

Answer/ Hint      

Answer : B

Explanation :

31.

Air coolers are more suitable for

Answer/ Hint      

Answer : B

Explanation :

32.

The velocity of sound in air

Answer/ Hint      

Answer : D

Explanation :

33.

The device which converts sound energy into electrical energy is called

Answer/ Hint      

Answer : C

Explanation :

34.

The light rays used for eliminating bacteria

Answer/ Hint      

Answer : D

Explanation :

35.

A vacuum cleaner works on the principle of pressure difference. On the moon it will

Answer/ Hint      

Answer : B

Explanation :

36.

Which one of the following has the highest value of specific heat ?

Answer/ Hint      

Answer : D

Explanation :

37.

Necessary element for change in solar energy to electric energy

Answer/ Hint      

Answer : B

Explanation :

38.

Damp clothes are dried in spin dryers by the action of

Answer/ Hint      

Answer : B

Explanation :

39.

Steam at 1000C causes more severe burns than water at 1000C because

Answer/ Hint      

Answer : B

Explanation :

40.

During hot weather, the fan produces a feeling of comfort. This is because

Answer/ Hint      

Answer : C

Explanation :

41.

Which of the following is a result of Surface tension ?

Answer/ Hint      

Answer : C

Explanation :

42.

Sprayer  functions on

Answer/ Hint      

Answer : A

Explanation :

43.

The wall of a dam is broader at the base

Answer/ Hint      

Answer : B

Explanation :

44.

Which of the following liquids is most viscous ?

Answer/ Hint      

Answer : A

Explanation :

45.

The surface tension of water on adding detergent to it

Answer/ Hint      

Answer : B

Explanation :

46.

In a refrigerator, the cooling system should always be

Answer/ Hint      

Answer : B

Explanation :

47.

Ocean currents are an example of

Answer/ Hint      

Answer : A

Explanation :

48.

The ‘four stroke petrol engine’ is based on

Answer/ Hint      

Answer : B

Explanation :

49.

If an ordinary glass tube and a glass capillary tube are both dipped in a beaker of water. Water rises in

Answer/ Hint      

Answer : A

Explanation :

50.

A single fixed pulley is used to draw water from a well because

Answer/ Hint      

Answer : D

Explanation :

51.

Speed of sound in air is unaffected by change in :

Answer/ Hint      

Answer : A

Explanation :

52.

Water is used in car radiator because of its

Answer/ Hint      

Answer : C

Explanation :

53.

Heat stored in water  vapour is

Answer/ Hint      

Answer : B

Explanation :

54.

Water cannot be used to extinguish fire caused by electric current, because

Answer/ Hint      

Answer : A

Explanation :

55.

What happens to a liquid, when the vapour pressure equals the atmospheric pressure ?

Answer/ Hint      

Answer : B

Explanation :

56.

Water boils at a lower temperature on the hills because

Answer/ Hint      

Answer : C

Explanation :

57.

Why do birds not have respiratory trouble at the time of flying at high altitude ?

Answer/ Hint      

Answer : C

Explanation :

58.

Ball pen functions on the principle of :

Answer/ Hint      

Answer : D

Explanation :

59.

When milk is churned, the cream separates from it due to :

Answer/ Hint      

Answer : B

Explanation :

60.

Permissible noise level at Residential area during night time is :

Answer/ Hint      

Answer : A

Explanation :

61.

A body absorbs heat most if it is

Answer/ Hint      

Answer : A

Explanation :

62.

The following particles move with same kinetic energy. Which of them has maximum momentum ?

Answer/ Hint      

Answer : D

Explanation :

63.

Water from soil enters into the root hairs owing to :

Answer/ Hint      

Answer : B

Explanation :

64.

Water will not ne vapourised if

Answer/ Hint      

Answer : C

Explanation :

65.

Railway tracks are banks are banked on curves so that

Answer/ Hint      

Answer : C

Explanation :

66.

The pitch of sound depends on its

Answer/ Hint      

Answer : A

Explanation :

67.

The energy that can harness heat stored below the earth’s surface is known as :

Answer/ Hint      

Answer : D

Explanation :

68.

The temperature of boiling water in a steam engine may be high because :

Answer/ Hint      

Answer : C

Explanation :

69.

Fat can be separated from milk in a cream separator because of :

Answer/ Hint      

Answer : D

Explanation :

70.

The technique of collecting information about an object from a distance without making physical contact with it is

Answer/ Hint      

Answer : A

Explanation :

71.

Metal tea pots have wooden handles because

Answer/ Hint      

Answer : B

Explanation :

72.

The Newton’s First Law is also called as

Answer/ Hint      

Answer : B

Explanation :

73.

If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is

Answer/ Hint      

Answer : B

Explanation :

74.

The water from a hand pump is warm in winter because

Answer/ Hint      

Answer : B

Explanation :

75.

Water is used in hot water bags because

Answer/ Hint      

Answer : C

Explanation :

76.

Water drops cannot stick to the oily surface due to

Answer/ Hint      

Answer : B

Explanation :

77.

Velocity of sound in air does not depend on

Answer/ Hint      

Answer : C

Explanation :

78.

Which of the following criterion is used for any metal to be used as a cooking material ?

Answer/ Hint      

Answer : B

Explanation :

79.

Which of the following is a good conductor of heat but bad conductor of electricity ?

Answer/ Hint      

Answer : A

Explanation :

80.

A solid needle placed horizontally on the surface of the water floats due to

Answer/ Hint      

Answer : C

Explanation :

81.

When hot liquid is poured into a thick glass tumbler, it cracks because glass :

Answer/ Hint      

Answer : A

Explanation :

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