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- 1. Multiple Choice
What is Doppler effect?
phenomenon of motion-related frequency change.
phenomenon of motion-related acceleration change.
phenomenon of motion-related change in distance
None of the above
- 2. Multiple Choice
the place / thing / person from where the sound is generated ?
Observer
Source
- 3. Multiple Choice
Which is NOT an application of Doppler effect ?
Radar
Meteorology - Tracking storms
Diagnosing heart problems
All of the other options are applications of Doppler effect
- 4. Multiple Choice
When a light source moves away from the observer , the frequency received by the observer will be less than the frequency transmitted by the source.
True
False
- 5. Multiple Choice
When source is moving with ‘velocity towards an observer at rest, then apparent frequency is -
none of the above
- 6. Multiple Choice
If wind is also blowing with a velocity w in the direction of sound, then its velocity is added to the velocity of sound. Hence, in this condition the apparent frequency is givenby
True
False
- 7. Multiple Choice
The apparent frequency of the whistle of an engine changes in the ratio 3 : 2 as the engine passes a stationary observer. If the velocity of sound is 330 m/s, calculate the velocity of the engine.
76 m/s
66 m/s
120 m/s
90 m/s
130 m/s
- 8. Multiple Choice
A train whistle is blown by the driver who hears the sound at 650 Hz. If the train is heading towards a station at 20.0 m/s, what will the whistle sound like to a waiting commuter? Take the speed of sound to be 340 m/s
592 Hz
801 Hz
456 Hz
691 Hz
- 9. Multiple Choice
Doppler effect applies to
Sound wave only
Light wave only
Both of sound waves and light waves
Neither of sound waves and light waves.
- 10. Multiple Choice
A case where an observer is standing on a railway platform and train blowing whistle Recedes away from him and due to this does the number of waves reaching him -
Increase
Decrease
Remain the same
None of the above
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