set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

At what point the Fahrenheit temperature is double of Centigrade temperature?

a) – 12.3°C

b) 12.3°C

c) – 6.7°C

d) 160°C

Question : 4

Diffusion of light in the atmosphere takes place due to

a) Helium

b) Dust particles

c) Carbon dioxide

d) Water vapours

Question : 5

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 : 6

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