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

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set 8

set 9

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set 11

set 12

set 13

set 14

set 15

set 16

Question : 26

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

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.

Question : 27

The fastest mode of transfer of heat is

a) radiation

b) conduction

c) convection

d) None of these

Answer: (a)

Question : 28 [UPPCS (Pre) 1990]

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

a) Vacuum

b) Iron

c) Water

d) Air

Answer: (a)

Question : 29

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 : 30 [MPPCS (Pre) 1993]

Which one of the following is the effect of the flight of supersonic jet?

a) Eye disease

b) Depletion in ozone layer

c) Air pollution

d) None of the above

Answer: (b)

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