Oscillations and Waves-Doppler Effect in Sound (NEET Physics): Questions 1 - 5 of 15

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Question number: 1

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

Doppler shift in frequency depends upon

Choices

Choice (4) Response

a.

The velocity of the observer

b.

The frequency of the wave produced

c.

The velocity of the source

d.

All c. , a. and b. are correct

Question number: 2

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A whistle giving out 461 Hz approaches a stationary observer at a speed of 44 m/s. The frequency heard by the observer in Hz is

Choices

Choice (4) Response

a.

545 Hz

b.

550 Hz

c.

532 Hz

d.

430 Hz

Question number: 3

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A source of sound and a listener are moving towards each other with a speed 112 of the speed of sound. If the frequency of the note emitted by the source is f, the frequency of the note heard by the listener will be nearly:

Choices

Choice (4) Response

a.

1.20 f

b.

2.0 f

c.

2.20 f

d.

1.18 f

Question number: 4

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A police car moving at 22 m/s, chases a motorcyclist. The police man sounds his horn at 180 Hz, while both of them move towards a stationary siren of frequency 162 Hz. Calculate the speed of the motorcycle, if it is given that he does not observes any beats

Choices

Choice (4) Response

a.

33 m/s

b.

22 m/s

c.

Zero

d.

28.7 m/s

Question number: 5

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

A whistle sends out 256 waves in a second. If the whistle approaches the observer with velocity 1/3 of the velocity of sound in air, the number of waves per second the observer will receive,

Choices

Choice (4) Response

a.

384

b.

300

c.

200

d.

192

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