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Characteristics of Sound Waves, Class 9 Science

1. There will be total 20 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. Which of the following correctly relates the wavelength λ, frequency f and velocity v of sound?
 
 
 
 

Question 1 of 20

2. The wavelength of the sound produced by a tuning fork of frequency 450 Hz which is set to vibrate in air (take velocity of sound in air as 320 m/s) is
 
 
 
 

Question 2 of 20

3. A siren has 16 holes and is making 960 revolutions per minute. The frequency of the sound produced by the siren is:
 
 
 
 

Question 3 of 20

4. SI unit of frequency is
 
 
 
 

Question 4 of 20

5. Arrange in increasing order – Speed of sound in steel, in distilled water, in sea water and in oxygen.
 
 
 
 

Question 5 of 20

6. A top makes 16 rotations about its own axis within 0.4 seconds, its frequency is:
 
 
 
 

Question 6 of 20

7. On which quantity does the pitch of the sound depend?
 
 
 
 

Question 7 of 20

8. What is the difference between a low pitched and high pitched sound?
 
 
 
 

Question 8 of 20

9. A compression is a region of
 
 
 
 

Question 9 of 20

10. Sound from a flute and sound from a harmonica played by passing air through musical instrument, at same time and same distance from ear and traveling through same medium air, they differ in sounds due to difference in
 
 
 
 

Question 10 of 20

11. A stationary rail engine produces whistle with a frequency 2600 Hz. A person standing at a distance of 550 m from engine will listen ___________ no. of waves within one minute.
 
 
 
 

Question 11 of 20

12. If we increase the temperature of air from 0°C to 22°C, then the speed of sound would
 
 
 
 

Question 12 of 20

13. Compressions are the regions where
 
 
 
 

Question 13 of 20

14. By counting the number of vibrations of a tuning fork per second, ___________ can be found.
 
 
 
 

Question 14 of 20

15. A bell vibrates 600 times within 3/2 seconds, its frequency and time period will be:
 
 
 
 

Question 15 of 20

16. A swing has a time period of 1.4 seconds. The no. of oscillations made by it within 1 minute 24 seconds will be:
 
 
 
 

Question 16 of 20

17. Choose one of the following, on which the frequency of a vibrating body does not depend.
 
 
 
 

Question 17 of 20

18. A baby cries with a frequency 712 Hz, if the speed of sound in air is 356m/s, the wavelength of sound is:
 
 
 
 

Question 18 of 20

19. A progressive transverse wave has a speed of 5040 m/s, its frequency is 315 Hz, then the distance between a crest and an immediate trough is:
 
 
 
 

Question 19 of 20

20. Sound of single frequency is called
 
 
 
 

Question 20 of 20


 

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