set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

The sound travels fastest in

a) liquids

b) solids

c) gases

d) none of these

Question : 2

In a sitar wire which one of the following types of vibration is produced?

a) Stationary longitudinal

b) Progressive longitudinal

c) Progressive transverse

d) Stationary transverse

Question : 3

Smoke emerging from a campfire at the bottom of a hill is being observed by a person at some distance, as shown in the figure. It is evening and the sun has just set behind the hill. Consider regions I and II of the smoke going up the sky

a) region I will be slightly brighter than the hill and region II will be slightly darker than the sky

b) region I will be slightly brighter than the hill and region II will be slightly brighter than the sky

c) region I will be slightly darker than the hill and region II will be slightly brighter than the sky

d) region I will be slightly darker than the hill and region II will be slightly darker than the sky

Question : 4

Consider the following statements:

1. Loudness or softness of a sound is determined by its amplitude.
2. Two sounds of same loudness and pitch can be distinguished by quality.
3. The speed of sound decreases on increasing the temperature.

a) 2 and 3

b) 1 and 2

c) 1 and 3

d) 1, 2 and 3

Question : 5

When there is depletion of ozone in the stratosphere, the wavelength of radiation striking the Earth’s surface will be

a) $10^{-2}$ m

b) 10^–7 m

c) 10^–10 m

d) 100 m

Question : 6

According to the kinetic theory of gases

a) at any instant one-third of the total atoms are moving along x-axis

b) all the atoms move horizontally with equal speeds

c) an atom moves faster during its downward motion than its upward motion

d) None of these