set 8 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider the following statements:

1. Water kept in an open vessel will quickly evaporate on the surface of the moon.
2. The temperature at the surface of the moon is much higher than boiling point of the water.
3. Two bodies at different temperatures, if brought in contact do not necessary settle to the mean temperature.
4. The two bodies may have different thermal capacities.

a) 2 and 3

b) 2, 3 and 4

c) 1, 2 and 3

d) 1, 2, 3 and 4

Question : 2

Consider the following statements:

1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is.
2. If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really is.

a) 2 only

b) 1 and 2

c) 1 only

d) None

Question : 3

Echo is a type of

a) neither reflected sound nor refracted sound

b) reflected sound

c) refracted sound

d) None of these

Question : 4

Total internal reflection can take place only if

a) the refractive indices of the two media are close to different

b) light goes from optically rarer medium (smaller refractive index) to optically denser medium

c) light goes from optically denser medium to rarer medium

d) the refractive indices of the two media are widely different

Question : 5

A noise level of 100 decibel would correspond to

a) Ordinary conversation

b) Sound from a noisy street

c) Just audible sound

d) Noise from a machine shop

Question : 6

The radius of curvatute of the plane mirror is

a) Infinity

b) One

c) Zero

d) Between one and infinity