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 Physics Questions

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Q:

Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?

 

A) The cloth completely absorbs red colour wavelength B) It is due to refraction
C) It is the effect of scattering of light D) It is due to Parallax error
 
Answer & Explanation Answer: A) The cloth completely absorbs red colour wavelength

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Q:

What is the Centre of Curvature of a spherical mirror?

A) It is the centre of a hollow sphere of which the spherical mirror is a part B) It is the midpoint of a spherical mirror
C) It is the point on the principal axis through which rays of light parallel to the principal axis pass after reflection D) It is a point from which the rays of light appear to be coming from on the principal axis of a convex mirror
 
Answer & Explanation Answer: A) It is the centre of a hollow sphere of which the spherical mirror is a part

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Q:

A body of mass 6 kg accelerates from 6 m/s to 18 m/s in 3 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).

 

A) 48 B) 60
C) 24 D) 96
 
Answer & Explanation Answer: C) 24

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Q:

Objects float on water based on ___.

A) Newton's third law of motion B) Hooke's law
C) Faraday's law D) Archimedes principle
 
Answer & Explanation Answer: D) Archimedes principle

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Q:

Which of the following statements is true with respect to Glucometer?

A) It is a medical device B) It is a non-medical device
C) It is used to measure oxygen level in the air D) It is used to measure nitrogen level in the air
 
Answer & Explanation Answer: A) It is a medical device

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Q:

The speed of light in vacuum is estimated as ___ meters/second.

A) 3.00 x 108 B) 3.10 x 108
C) 3.12 x 108 D) 3.15 x 108
 
Answer & Explanation Answer: A) 3.00 x 108

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Q:

What is the amount of work done when a body moves under a force of 1 N at a distance of 1 meter in the direction of the force?

A) 1 Joule B) 0.01 Joules
C) 100 Joules D) 10 Joules
 
Answer & Explanation Answer: A) 1 Joule

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Q:

____ is used in periscope.

A) Plane mirror B) Prism
C) Concave lens D) Convex lens
 
Answer & Explanation Answer: A) Plane mirror

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