Physical Science MCQ Questions Answers Objective Sample Practice Set

31) A jet engine works on the principle of conservation of

a) Linear momentum

b) Angular momentum

c) Energy Mass

d) Mass Velocity

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Option – a)

32) The rotational effect of a force on a body about an axis of rotation is described in terms of the

a) Centre of gravity

b) Centripetal force

c) Centrifugal force

d) Moment of force

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Option – d)

33) Identify the vector quantity from the following

a) Heat

b) Angular momentum

c) Time

d) Work

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Option – b)

34) On a cold day when a room temperature is 15 DEGREE C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15 DEGREE C, because

a) metals have higher thermal capacity than plastics

b) plastics have a lower density than metals

c) metals are good conductor of heat

d) plastics have a higher thermal conductivity than metals

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Option – c)

35) Which instrument is used to measure curvature of spherical objects ?

a)Spectroscope

b)Spherometer

c)Spectrometer

d)Sextant

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Option – b)

36) Which instrument is used to record physical happenings at a distant place ?

a)Thermostat

b)Tonometer

c)Telemeter

d)Transponder

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Option – c)

37) Which instrument is used in submarine to see the objects above sea level ?

a)Pykometer

b)Polygraph

c)Photometer

d)Periscope

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Option – d)

38) Name of the instrument to measure atomspheric pressure ?

a)Barometer

b)Barograph

c)Bolometer

d)Callipers

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Option – a)

39) What is refractive index ?

a)it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

b)it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

c)it is defined as the product of speed of light in medium and in vacuum.

d)None of above

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Option – b)

40) Young’s modulus is the property of

a) Gas only

b) Both Solid and Liquid

c) Liquid only

d) Solid only

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Option – d)