set 8 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

Consider the following statements:

1. Steam at 100°C and boiling water at 100°C contain the same amount of heat.
2. The latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils.

a) 2 only

b) 2 and 3

c) 1 and 2

d) 3 only

Question : 3

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 : 4

The radius of curvatute of the plane mirror is

a) Infinity

b) One

c) Zero

d) Between one and infinity

Question : 5

Bats can fly during dark nights and also prey. This is because

a) Their night vision is very good

b) Every bird can do this

c) The pupil of their eyes is large

d) They produce ultrasonic waves and are guided by them

Question : 6

A watch shows times as 3 : 25 when seen through a mirror, time appeared will be

a) 7 : 35

b) 8 : 35

c) 9 : 35

d) 8 : 25