Physical Science MCQ Questions Answers Objective Sample Practice Set

41) If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that ?

a) Newton’s first law

b) Newton’s Second Law

c) Newton’s Third Law

d) Principle of conservation of linear momentum

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Option – d)

42) Bolometer is used to measure

a) Frequency

b) Temperature

c) Velocity

d) Wavelength

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Option – c)

43) The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called

a) Nuclear fusion

b) Nuclear fission

c) Nuclear reaction

d)Fast breeding

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Option – b)

44) Which instrument is used to measure depth of ocean ?





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Option – d)

45) Light year is a unit of

a) time

b) distance

c) light

d) intensity of light

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Option – b)

46) Intensity of sound at a point is ____ its distance from the source.

a) directly proportional to

b) inversely proportional to

c) directly proportional to square of

d) inversely proportional to square of

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Option – d)

47) A man presses more weight on earth at :

a) Sitting position

b) Standing Position

c) Lying Position

d) None of these

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Option – b)

48) Energy possessed by a body in motion is called

a) Kinetic Energy

b) Potential Energy

c) Both A and B

d) None of these

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Option – a)

49) A piece of ice is dropped in a vesel containing kerosene. When ice melts, the level of kerosene will

a) Rise

b) Fall

c) Remain Same

d) None of these

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Option – b)

50) Stars appears to move from east to west because

a) all stars move from east to west

b) the earth rotates from west to east

c) the earth rotates from east to west

d) the background of the stars moves from west to east

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Option – b)