set 16 MCQ Questions & Answers Detailed Explanation

Question : 1

At sunrise or at sunset the sun appears to be reddish while at mid-day it looks white. This is because

a) refraction causes this phenomenon

b) scattering due to dust particles and air molecules causes this phenomenon

c) the sun is cooler at sunrise or at sunset

d) diffraction sends red rays to the earth at these times

Question : 2

Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure?

a) f-8, 1/250

b) f-16, 1/125

c) f-22, 1/60

d) f-5.6, 1/1000

Question : 3

Rear-view mirror used in a vehicle is a

a) plane mirror

b) concave mirror

c) convex mirror

d) None of these

Question : 4

What is the distance between two successive crests or successive troughs called?

a) Frequency

b) Wavelength

c) Amplitude

d) None of these

Question : 5

The image formed by astronomical telescope is

a) Real and diminished

b) Virtual and magnified

c) Virtual and diminished

d) Real and magnified

Question : 6

In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because a narrow slit

a) allows only one colour at a time

b) produces less diffraction

c) increases intensity

d) allows a more parallel beam when it passes through the lens