set 3 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 : A man is standing on a railway platform listening to the whistle of an engine that passes the man at a constant speed without stopping. If the engine passes the man at time t0. How does the frequency f of the whistle as heard by the man change with time :

(a)

physics sound mcq question answer 19 option c

(b)

physics sound mcq question answer 19 option a

(c)

physics sound mcq question answer 19 option b

(d)

physics sound mcq question answer 19 option d

The correct answers to the above question in:

Answer: (b)

f1 = f$(v/{v - v_s})$ and f2 = f$(v/{v + v_s})$;

So the frequency of the whistle suddenly changes from f1 to f2.

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

Question : 1

The fastest mode of transfer of heat is

a) radiation

b) conduction

c) convection

d) None of these

Answer: (a)

Question : 2

In which of the following option sound may not be across travel?

a) Vacuum

b) Iron

c) Water

d) Air

Answer: (a)

Question : 3

The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by

a) Planck’s law of radiation

b) Wien’s law

c) Rayleigh's law

d) Stefan’s law of radiation

Answer: (a)

Question : 4

Which of the following has the longest wavelength?

a) X-rays

b) Visible light

c) Infrared

d) Radio waves

Answer: (d)

Question : 5

The red colour of the Sun at Sunset and Sunrise is due to

a) Total internal reflection of light

b) Refraction of light

c) Scattering of light

d) Dispersion of light

Answer: (c)

Question : 6

Assertion (A):
The handle of pressure cooker is made up of Abonite.
Reason (R):
Abonite is a hard material.
Code

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Answer: (a)

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