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BITSAT SERIES
Physics

Doppler Effect

10 previous year questions.

Volume: 10 Ques
Yield: Medium

High-Yield Trend

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2020
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2019
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2016
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2015
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2014
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2012
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2010
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2009

Chapter Questions
10 MCQs

01
PYQ 2009
easy
physics ID: bitsat-2
Two sources and are sending notes of frequency . A listener moves from and with-a constant velocity . If the speed of sound in air is what must be the value of u so that he hears beats per second?
1
2
3
4
02
PYQ 2010
medium
physics ID: bitsat-2
A source has wavelength 60 cm when it is stationary. If the speed of sound in air is 320m s⁻¹ and the source moves with speed 20m s⁻¹, the wavelength in the forward direction will be
1
56 cm
2
60 cm
3
64 cm
4
68 cm
03
PYQ 2012
medium
physics ID: bitsat-2
A sound source is moving towards a stationary listener with th of the speed of sound. The ratio of apparent to read frequency is:
1

2

3

4

04
PYQ 2014
medium
physics ID: bitsat-2

A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency of sound heard by the observer is plotted against time . Which of the following graphs represents the correct variation?

1
Graph (a)
2
Graph (b)
3
Graph (c)
4
Graph (d)
05
PYQ 2015
medium
physics ID: bitsat-2
Two tuning forks with natural frequencies 340 Hz each move relative to a stationary observer. One fork moves away from the observer while the other moves towards the observer with the same speed. The observer hears beats of frequency 3 Hz. Find the speed of the tuning forks.
1

2

3

4
06
PYQ 2016
medium
physics ID: bitsat-2

A source of sound S emitting waves of frequency 100Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4m s⁻1 at an angle of with the source–observer line as shown. The observer is at rest. The apparent frequency observed is (velocity of sound in air =330m s⁻1):

1

2

3

4
100Hz
07
PYQ 2016
easy
physics ID: bitsat-2
A source of sound emitting waves of frequency and an observor are located at some distance from each other. The source is moving with a speed of at an angle of with the source observer line as shown in the figure. The observor is at rest. The apparent frequency observed by the observer is (velocity of sound in air )
1
103 Hz
2
106 Hz
3
97 Hz
4
100 Hz
08
PYQ 2019
medium
physics ID: bitsat-2
Two tuning forks with natural frequencies 340 Hz each move relative to a stationary observer. One fork moves away from the observer, while the other moves towards the observer at the same speed. The observer hears beats of frequency 3 Hz. Find the speed of the tuning forks.
1

2

3

4
2.5m/s
09
PYQ 2019
medium
physics ID: bitsat-2
speeds of and relative to the ground. The first train sounds a whistle of frequency . The frequency of the whistle heard by a passenger in the second train before the train meets, is (the speed of sound in air is 340 m/s)
1
600 Hz
2
585 Hz
3
645 Hz
4
666 Hz
10
PYQ 2020
medium
physics ID: bitsat-2

A source of sound S emitting waves of frequency 100Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4m s⁻1 at an angle of 60^∘ with the source–observer line as shown in the figure. The observer is at rest. Find the apparent frequency observed by the observer. (Velocity of sound in air =330m s⁻1).

1

2

3

4
100Hz