light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

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set 12

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set 16

Question : 16 [IAS (Pre) 1993]

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

Answer: (c)

Question : 17 [PSC (Pre) 2019]

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

Answer: (d)

Question : 18

The ability of an optical instrument to show the images of two adjacent point objects as separate is called

a) resolving power

b) dispersive power

c) magnifying power

d) None of these

Answer: (a)

This ability refers to resolving power of the instrument.

Question : 19

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

Answer: (c)

Bubble will behave as diverging lens because refrective index of air is less than that of a glass.

Question : 20

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

Answer: (c)

IMPORTANT general science mcq EXERCISES

set 12 Online Quiz

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1650 heat wave motion sound optics oscillations based general science mcq set 12 question answer pdf
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