set 12 MCQ Questions & Answers Detailed Explanation

Question : 1

When light passes from one medium to another medium, which one of the following does not change?

a) Wavelength

b) Velocity

c) Intensity

d) Frequency

Question : 2

A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of

a) total internal reflection of light

b) reflection of light

c) refraction of light

d) interference of light

Question : 3

Pressure cooker cooks food in lesser time because

a) Air has no effect as it is closed from all sides

b) Temperature of boiling water increases due to high pressure

c) The temperature of boiling water decreases due to high pressure

d) Evaporation of the water used is very small

Question : 4

There are four objects A, B, C and D. It is observed that A and B are in thermal equilibrium and C and D are also in thermal equilibrium. However, A and C are not in thermal equilibrium. We can conclude that –

a) B and D cannot be in thermal equilibrium

b) B and D are in thermal equilibrium

c) B and D could be in thermal equilibrium but might not be A and D

d) the zeroth law of thermodynamics does not apply here because there are more than three objects

Question : 5

The atmosphere exerts enormous pressure on us. But, we do not feel it because

a) We are used to it

b) Our bones are very strong and can withstand the pressure

c) Our blood exerts a pressure slightly more than that of the atmosphere

d) The surface area of our head is very small