# Oscillations and Waves-Doppler Effect in Sound (NEET Physics): Questions 1 - 5 of 16

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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 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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