# Oscillations and Waves-Doppler Effect in Sound (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 1 - 4 of 5

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## Question number: 1

» Oscillations and Waves » Doppler Effect in Sound

Appeared in Year: 2010

MCQ▾

### Question

Velocity of sound measured at a given temperature in oxygen and hydrogen is in the ratio –

### Choices

Choice (4) Response

a.

32: 1

b.

4: 1

c.

1: 4

d.

1: 1

## Question number: 2

» Oscillations and Waves » Doppler Effect in Sound

Appeared in Year: 2011

MCQ▾

### Question

A speaker emits a sound wave of frequency f0. When it moves towards a stationary observer with speed u, the observer measures a frequency f1. If the speaker is stationary, and the observer moves towards it with speed v, the measured frequency is f2. Then –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 3

» Oscillations and Waves » Doppler Effect in Sound

Appeared in Year: 2010

MCQ▾

### Question

A bus driving along at 39.6 km/h is approaching a person who is standing at the bus stop, while honking repeatedly at an interval of 30 seconds. If the speed of the sound is 330 m/s, at what interval will the person hear the horn?

### Choices

Choice (4) Response

a.

29 seconds

b.

31 seconds

c.

30 seconds

d.

The interval will depend on the distance of the bus from the passenger

## Question number: 4

» Oscillations and Waves » Doppler Effect in Sound

Appeared in Year: 2014

MCQ▾

### Question

A whistle emitting a loud sound of frequency 540 Hz is whirled in a horizontal circle of radius 2 m and at a constant angular speed of 15 rad/s. The speed of sound is 330 m/s. The ratio of the highest to the lowest frequency heard by a listener standing at rest at a large distance from the center of the circle is –

### Choices

Choice (4) Response

a.

1.1

b.

1.2

c.

1.4

d.

1.0

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