set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

The red colour of the Sun at Sunset and Sunrise is due to

a) Total internal reflection of light

b) Refraction of light

c) Scattering of light

d) Dispersion of light

Question : 2

Which of the following has the longest wavelength?

a) X-rays

b) Visible light

c) Infrared

d) Radio waves

Question : 3

A man is standing on a railway platform listening to the whistle of an engine that passes the man at a constant speed without stopping. If the engine passes the man at time t₀. How does the frequency f of the whistle as heard by the man change with time :

a)

b)

c)

d)

Question : 4

If a tunnel is dug along the diameter of earth and a piece of stone is dropped into it, then the stone will

a) start oscillating about the centre of the earth

b) come out of the another end of the earth and will escape out in space

c) come to rest at the centre of the earth

d) stop at another end of the earth

Question : 5

Light appears to travel in a straight line because

a) The wavelength of light is very small

b) The velocity of light is very large

c) It consists of small particles

d) Light is reflected by the surroundings

Question : 6

Which one of the following properties distinguishes ultrasound from normal audible sound?

a) Speed of propagation

b) Intensity

c) Frequency

d) Quality