# Oscillations and Waves-Doppler Effect in Sound (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 6 - 10 of 16

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## Question number: 6

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

A whistle sends out 210 waves in a second. If the whistle approaches the observer with velocity 1/4 of the velocity of sound in air, the number of waves per second the observer will receive

### Choices

Choice (4) Response

a.

384

b.

320

c.

182

d.

280

## Question number: 7

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n 1, the value of is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 8

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

A source of sound emitting a note of frequency 200 Hz moves towards an observer with a velocity v equal to the velocity of sound. If the observer also moves away from the source with the same velocity v, the apparent frequency heard by the observer is,

### Choices

Choice (4) Response

a.

200 Hz

b.

100 Hz

c.

150 Hz

d.

50 Hz

## Question number: 9

» 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 176 Hz, while both of them move towards a stationary siren of frequency 165 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.

Zero

c.

11 m/s

d.

22 m/s

## Question number: 10

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

The speed of sound in air at a given temperature is 250 m/s. An engine blows whistle at a frequency of 810 cps. It is approaching the observer with velocity 25 m/s. The apparent frequency in cps heard by the observer will be

### Choices

Choice (4) Response

a.

1100

b.

800

c.

900

d.

1000

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