set 6 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 : Consider the figures of a metal ball and a metal ring given below. The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal is heated
Thermodynamics mcq question answer 24

(a) The ball gets stuck because of the diameter of the hole decrease on expansion

(b) The ball will still pass through because the hole diameter does not change

(c) The ball can still pass through the ring as diameter expands on heating

(d) The ball will pass through because there is no change in the ring

The correct answers to the above question in:

Answer: (c)

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

Question : 1

Some common mediums in which the speed of sound waves is measured are mentioned below?

  1. Air
  2. Steel
  3. Copper
  4. Water
What is the correct increasing order of the speed of sound?

a) 1 < 4 < 3 < 2

b) 1 < 4 < 2 < 3

c) 4 < 1 < 2 < 3

d) 4 < 1 < 3 < 2

Answer: (a)

The speed of sound is maximum in solids

Vsolid > Vliquid > Vgas.

Steel is more elastic than copper, hence the speed of sound is greater in steel than in copper.

Question : 2

Optical fibre works on the principle of

a) Scattering

b) Refraction

c) Total internal reflection

d) Interference

Answer: (c)

Question : 3

Which of the following statements is correct ?

a) Frequency of ultrasonic waves is of the same order as that of X-rays

b) Ultrasonic waves can travel in vacuum

c) Wavelength of ultrasonic waves is of the same order as that of microwaves

d) Speed of ultrasonic waves is of the same order as that of light

Answer: (a)

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