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Physics English Medium Fsc Part 1 Chapter 8 Online MCQs Test MCQs With Answers

Question # 1

In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

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Question # 2

The apparent change in the pitch of sound due to relative motion is called.

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Carnot theorem

Interference

Doppler effect

Beats

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Question # 3

Radar system is an application of.

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Chemical effect

Electric effect

Magnetic effect

Doppler's effect

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Question # 4

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

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Question # 5

In transverse waves the particles of medium vibrate

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Along the direction of wave

Opposite to direction of wave

Perpendicular to direction of wave

Slowly

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Question # 6

When ever the path difference between the waves is integral multiple of half the wavelength, interference will be

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Constructive

Destructive

(-)ve

(+) ve

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Question # 7

Increase in the velocity of sound in air for 1 ^oC rise in temperature is.

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61 ms-1

0.61 ms-1

161 ms-1

261 ms-1

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Question # 8

Wavelength of a wave for closed pipe having length 'l' in the fundamental mode is.

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2 l

1/2

4 l

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Question # 9

The portion of the wave above mean level is called.

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Node

Antinode

Crest

Trough

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Question # 10

Sound waves are

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Electromagnetic waves

Transverse waves

Compressional waves

Matter waves

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Question # 11

The error in speed of sound calculated by Newton at STP is about.

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0 %

14 %

15 %

16 %

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