general science

Physics MCQ Questions and Answers Page - 5

1.

Hydro-electric power is a :

Answer/ Hint      

Answer : D

Explanation :

2.

A drop of liquid assumes spherical shape because :

Answer/ Hint      

Answer : B

Explanation :

3.

If cream is removed from milk, its density

Answer/ Hint      

Answer : A

Explanation :

4.

The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall

Answer/ Hint      

Answer : C

Explanation :

5.

Materials for rain proof coats and tents owe their water proof properties to

Answer/ Hint      

Answer : A

Explanation :

6.

When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together ?

Answer/ Hint      

Answer : A

Explanation :

7.

Microphone is a device which transforms the

Answer/ Hint      

Answer : A

Explanation :

8.

Pressure Cooks faster because

Answer/ Hint      

Answer : C

Explanation :

9.

It is easier for a man to swim in sea water, than in river water because

Answer/ Hint      

Answer : B

Explanation :

10.

The characteristic invalid for heat radiation is that it travels :

Answer/ Hint      

Answer : C

Explanation :

11.

Water is not suitable as a calorimetric substance because it :

Answer/ Hint      

Answer : A

Explanation :

12.

In a water lifting electric pump, we convert

Answer/ Hint      

Answer : A

Explanation :

13.

The earth is a

Answer/ Hint      

Answer : C

Explanation :

14.

When a piece of stone is immersed in water, it displaces water of equal

Answer/ Hint      

Answer : C

Explanation :

15.

The wavelength at which the peak of intensity of blackbody radiation occurs

Answer/ Hint      

Answer : B

Explanation :

16.

Man perceives sound vibrations in the frequency ranges of

Answer/ Hint      

Answer : D

Explanation :

17.

The ordinary and maximum tolerance limit of sound by human being is

Answer/ Hint      

Answer : B

Explanation :

18.

Steel is more elastic than rubber because it :

Answer/ Hint      

Answer : C

Explanation :

19.

Outside of cooking utensils are generally left black from below because

Answer/ Hint      

Answer : D

Explanation :

20.

A liquid disturbed by sitting comes to rest due to

Answer/ Hint      

Answer : C

Explanation :

21.

Instrument used to study the behaviour of a vibrating string is :

Answer/ Hint      

Answer : D

Explanation :

22.

When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are

Answer/ Hint      

Answer : B

Explanation :

23.

When a body is immersed in a liquid, the force acting on it is

Answer/ Hint      

Answer : D

Explanation :

24.

The locomotion of insects to the source of light is called :

Answer/ Hint      

Answer : A

Explanation :

25.

Which one among the following doesn’t have any effect on velocity of sound ?

Answer/ Hint      

Answer : C

Explanation :

26.

Green house effect is the heating up of the Earth’s atmosphere which is due to

Answer/ Hint      

Answer : C

Explanation :

27.

If the phase difference between two points is 1200 for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points is

Answer/ Hint      

Answer : D

Explanation :

28.

Clouds float in the atmosphere because of their

Answer/ Hint      

Answer : B

Explanation :

29.

The freezing point of fresh water is  _________ .

Answer/ Hint      

Answer : D

Explanation :

30.

The unit of noise pollution (level) is :

Answer/ Hint      

Answer : A

Explanation :

31.

A real gas can act as an ideal gas in

Answer/ Hint      

Answer : B

Explanation :

32.

Purity of a metal can be determined with the help of

Answer/ Hint      

Answer : C

Explanation :

33.

The work done by the string of a simple pendulum during one complete oscillation is equal to

Answer/ Hint      

Answer : D

Explanation :

34.

The minimum number of forces to keep a particle in equilibrium is

Answer/ Hint      

Answer : B

Explanation :

35.

Which of the following devices can be used to detect radiant heat ?

Answer/ Hint      

Answer : D

Explanation :

36.

The device used to convert solar energy into electricity is

Answer/ Hint      

Answer : A

Explanation :

37.

The word ‘insolation’ means

Answer/ Hint      

Answer : B

Explanation :

38.

While ascending a hill, the driver of the vehicle keeps the gear ratio

Answer/ Hint      

Answer : D

Explanation :

39.

The boiling point of water decreases at higher altitudes is due to

Answer/ Hint      

Answer : B

Explanation :

40.

Loudness of sound depends on

Answer/ Hint      

Answer : C

Explanation :

41.

A wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an

Answer/ Hint      

Answer : A

Explanation :

42.

The waves used in sonography are

Answer/ Hint      

Answer : D

Explanation :

43.

The first law of thermodynamics is simply the case of

Answer/ Hint      

Answer : D

Explanation :

44.

Hertz is a unit for measuring

Answer/ Hint      

Answer : B

Explanation :

45.

It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

Answer/ Hint      

Answer : C

Explanation :

46.

Ice is packed in saw dust because

Answer/ Hint      

Answer : B

Explanation :

47.

Burns caused by steam are much severe than those caused by boiling water because

Answer/ Hint      

Answer : B

Explanation :

48.

Sound is heard over longer distances on rainy days because

Answer/ Hint      

Answer : B

Explanation :

49.

We feel cool when we sit near the fan, this is because

Answer/ Hint      

Answer : C

Explanation :

50.

The average kinetic energy  of the molecules of an ideal gas is directly proportional to

Answer/ Hint      

Answer : C

Explanation :

51.

Which of the following property of sound is affected by change in air temperature ?

Answer/ Hint      

Answer : D

Explanation :

52.

The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes ?

Answer/ Hint      

Answer : D

Explanation :

53.

Blowing Air with open pipe is an example of :

Answer/ Hint      

Answer : C

Explanation :

54.

A cycle tyre bursts suddenly. This represents an :

Answer/ Hint      

Answer : B

Explanation :

55.

Super cooling stands for cooling of a liquid :

Answer/ Hint      

Answer : B

Explanation :

56.

Alcohol is more volatile than water because  ________  is lower than water.

Answer/ Hint      

Answer : A

Explanation :

57.

Which of the following is the second largest source of global energy ?

Answer/ Hint      

Answer : C

Explanation :

58.

Which of the following is the unit of prrceived loudness of sound ?

Answer/ Hint      

Answer : B

Explanation :

59.

Stress can be defined as  ________  quantity.

Answer/ Hint      

Answer : D

Explanation :

60.

Which term is not associated with sound wave ?

Answer/ Hint      

Answer : C

Explanation :

61.

When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will :

Answer/ Hint      

Answer : B

Explanation :

62.

When a ship enters the sea from a river what will be the effect ?

Answer/ Hint      

Answer : C

Explanation :

63.

Hydroscope is an instrument that shows changes in :

Answer/ Hint      

Answer : C

Explanation :

64.

The cooling by desert Cooler is based on :

Answer/ Hint      

Answer : C

Explanation :

65.

Which of the following is the methods of heat transfer ?

Answer/ Hint      

Answer : A

Explanation :

66.

At boiling point of liquids, its

Answer/ Hint      

Answer : C

Explanation :

67.

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

Answer/ Hint      

Answer : C

Explanation :

68.

The boiling point of water depends upon the

Answer/ Hint      

Answer : A

Explanation :

69.

During which of the following operating conditions of an automobile, carbon monoxide content in exhaust gas is maximum ?

Answer/ Hint      

Answer : C

Explanation :

70.

Intensity of any wave is proportional to which of the following ?

Answer/ Hint      

Answer : B

Explanation :

71.

Water is used in a hot water bag because

Answer/ Hint      

Answer : C

Explanation :

72.

What type of force acts on a car moving around a curve ?

Answer/ Hint      

Answer : C

Explanation :

73.

Which of the metals has the maximum thermal conductivity ?

Answer/ Hint      

Answer : C

Explanation :

74.

Which of the following is the cleanest source of energy ?

Answer/ Hint      

Answer : D

Explanation :

75.

The spring balance works on the principle of  __________ .

Answer/ Hint      

Answer : B

Explanation :

76.

At hill stations, the boiling point of water will be

Answer/ Hint      

Answer : B

Explanation :

77.

Kinetic energy depends on

Answer/ Hint      

Answer : D

Explanation :

78.

In which from is the supplied heat energy stored during change in temperature of substance ?

Answer/ Hint      

Answer : B

Explanation :

79.

In hydel power station, the motion produced in turbines is due to

Answer/ Hint      

Answer : A

Explanation :

80.

The quality or tone of a musical sound produced by a stringed instrument depends on

Answer/ Hint      

Answer : D

Explanation :

81.

During washing of clothes, we use indigo due to its

Answer/ Hint      

Answer : B

Explanation :

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