set 3 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 16 EXERCISES

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

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

(a) Vacuum

(b) Iron

(c) Water

(d) Air

The correct answers to the above question in:

Answer: (a)

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

Question : 1

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 : 2

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)

Question : 3

Consider the following statements:

  1. A flute of smaller length produces waves of lower frequency.
  2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Answer: (c)

The flute is a musical instrument of the woodwind family.

A flute of smaller length produces waves of higher frequency. Sound waves travel through medium even through an extremely dense medium like rocks in the form of longitudinal waves only.

A good example is the shock wave from an Earthquake, which can be heard hundreds of miles away from the epicentre after travelling through rocks in the ground.

Question : 4

The fastest mode of transfer of heat is

a) radiation

b) conduction

c) convection

d) None of these

Answer: (a)

Question : 5

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 : 6

Which of the following has the longest wavelength?

a) X-rays

b) Visible light

c) Infrared

d) Radio waves

Answer: (d)

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