set 12 MCQ Questions & Answers Detailed Explanation

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : 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

The correct answers to the above question in:

Answer: (a)

Thermal equilibrium means same temperature.

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

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 : 2

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 : 3

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.,$d_{apparent} = {d_{actual}}/μ$

Question : 4

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)

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