Class 9 Sound Quiz Set 1

1. A wave in slinky travelled two and fro in 5 sec the length of the slinky is 5 m. What is the velocity of wave?

 
 
 
 

2. Earthquake produces which kind of sound before the main shock wave begins

 
 
 
 

3. The number of compressions or rarefactions per unit time gives

 
 
 
 

4. In SONAR, we use

 
 
 
 

5. Note is a sound

 
 
 
 

6. Sound travels in air if

 
 
 
 

7. Infrasound can be heard by

 
 
 
 

8. When we change feeble sound to loud sound we increase its

 
 
 
 

9. When a body vibrates, it compresses the air surrounding and forms a high-density area known as ______

 
 
 
 

10. Speed of sound depends upon

 
 
 
 

11. The phenomenon where a sound produced is heard again due to reflection is called _____

 
 
 
 

12. Sound waves in air is an example of ______

 
 
 
 

13. Children under the age of 5 can hear upto

 
 
 
 

14. When the vibrating object moves backwards, it creates a region of low pressure called ______

 
 
 
 

15. In the curve half the wavelength is

 
 
 
 

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