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Doppler Effect, Class 11 Physics NCERT Solutions

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. In Doppler effect change in frequency depends on
 
 
 
 

Question 1 of 10

2. A sound source of frequency 600 Hz is moving towards an observer with velocity 20m/s. The speed of sound is 340m/s. The frequency heard by observer will be
 
 
 
 

Question 2 of 10

3. A radar sends a radio signal of frequency 9 x 109 Hz towards an aircraft approaching the radar. If the reflected wave shows a frequency shift of 3 X 103 Hz, the speed with which the aircraft is approaching the radar in m/s is (velocity of radio signal is 3 X 108 m/s).
 
 
 
 

Question 3 of 10

4. A police car moving at 22 m/s, chases a motor cyclist. The police man sounds his horn at 176 Hz while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motor cyclist, if it is given that he does not hear any beats. (Velocity of sound = 330 m/s).
 
 
 
 

Question 4 of 10

5. If a source of sound was moving toward a receiver at 1/3 the speed of sound, what would the resulting wavelength be?
 
 
 
 

Question 5 of 10

6. Doppler’s effect in sound is:
 
 
 
 

Question 6 of 10

7. Which medical instrument uses doppler effect?
 
 
 
 

Question 7 of 10

8. A whistle producing sound waves of frequencies 9500 Hz and above is approaching a stationary person with speed v ms-1. The velocity of sound in air is 300 ms-1. If the person can hear frequencies up to 10000 Hz, the maximum value of v upto which he can the whistle is
Doppler Effect Multiple Choice Questions for CBSE Class 11 Physics Topperlearning
 
 
 
 

Question 8 of 10

9. If the source of sound moves at the same speed or faster than speed of the wave then it results in
 
 
 
 

Question 9 of 10

10. Two trains A and B approach a station from opposite sides, sounding their whistles. A stationary observer on the platform hears no beats. If the velocities of A and B are 15 m/s and 30 m/s respectively and the real frequency of the whistle of B is 600 Hz, the real frequency of the whistle of A is (Velocity of sound = 330 m/s).
 
 
 
 

Question 10 of 10