set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The focusing in the eye is done by

a) To and fro movement of the retina

b) To and fro movement of the lens

c) Change in the convexity of the lens

d) Change in the refractive index of the eye fluid

Question : 2

Assertion (A):
Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R):
Ammonia can be liquefied at ambient temperatures at low pressures.
Code

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Question : 3

Consider the following statements.

1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
2. The speed of visible light in water is 0.95 times the speed in vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the overspeeding vehicles, police use the Doppler effect of reflected short radio waves.

a) 2 and 4

b) 1 and 3

c) 1 and 2

d) 3 and 4

Question : 4

The Sky appears blue due to

a) Blue light is minimum absorbed by atmosphere

b) The red colour is scattered most

c) Blue colour is scattered most

d) Red light is ultimately absorbed by atmosphere

Question : 5

Thermostat is a device which

a) Measures temperature

b) Automatically regulates the temperature of a system

c) Measures heat

d) Automatically regulates pressure of a system

Question : 6

Which one of the following is not electromagnetic in nature?

a) X-rays

b) Cathode-rays

c) Gamma-rays

d) Infrared-rays