# Oscillations and Waves (NEET Physics): Questions 156 - 160 of 195

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## Question number: 156

» 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: 157

» Oscillations and Waves » Beats

MCQ▾

### Question

Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 5 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observed

### Choices

Choice (4) Response

a.

8

b.

4

c.

16

d.

10

## Question number: 158

» 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: 159

» 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: 160

» Oscillations and Waves » Harmonics

MCQ▾

### Question

The loudness and the pitch of a sound depends on

### Choices

Choice (4) Response

a.

Intensity and frequency

b.

Frequency and velocity

c.

Intensity and velocity

d.

Frequency and number of harmonics

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