light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 1 [UPPCS (Pre) 2010]

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

Answer: (c)

Question : 2

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

Answer: (a)

Thermal equilibrium means same temperature.

Question : 3

Consider the following statements.

  1. Some bodies may contract from heating
  2. Water shows anomalous expansion.

a) Both (A) and (B) are true.

b) (A) is true and (B) is false

c) (A) is false and (B) is true.

d) Both (A) and (B) are false.

Answer: (a)

Some bodies like wood, rubber etc. have a negative value of the coefficient of thermal expansion, hence they contract on heating.

Hence (A) is true. (B) is also true.

Question : 4 [UPPCS (Mains) 2003]

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

Answer: (d)

Question : 5

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

Answer: (c)

We know that, the apparent depth is m times less than the actual depth. i.e.,$d_{apparent} = {d_{actual}}/μ$

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