Oscillations and Waves-Doppler Effect in Sound (KVPY Stream SB-SX (Class 12 & 1st Year BSC) 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.

f1=f2>f0

b.

f1<f2

c.

f1=f2<f0

d.

f1>f2

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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