set 12 MCQ Questions & Answers Detailed Explanation

Question : 1

A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a

a) plano-converging lens

b) converging lens

c) diverging lens

d) plano-diverging lens

Question : 2

Dispersion is the term used to describe

a) the bending of a beam of light when it strikes a mirror

b) the propagation of light in straight lines

c) the splitting of a beam of light into component colours

d) the change that takes place in white light after passage through red glass

Question : 3

Flash light equipped with a new set of batteries, produces bright white light. As the batteries wear out

a) it stops working suddenly while giving white light

b) the light intensity gets reduced with no change in its colour

c) light colour changes first to yellow and then red with no change in intensity

d) colour changes to red and also intensity gets reduced

Question : 4

When a person enters into a dark room from the strong light area, he is not able to see clearly for some time. Later he gradually begins to see things. This is because

a) Bleaching and reformation of Rhodopsins

b) Changes in the diameter and focal length of lens

c) Changes in the size of pupil

d) Eyes become familiar with darkness in course of time

Question : 5

The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon?

a) Diffraction and dispersion

b) Total refraction and dispersion

c) Total reflection and interference

d) Polarization and interference

Question : 6

Which of the following statement is true?

a) Celestial objects have the greatest velocity

b) The sound has the greatest velocity

c) The light has a greater velocity

d) Rocket has the greatest velocity