Class 9 Sound Quiz Set 1

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

 
 
 
 

2. In SONAR, we use

 
 
 
 

3. Sound waves in air is an example of ______

 
 
 
 

4. 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?

 
 
 
 

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

 
 
 
 

6. Speed of sound depends upon

 
 
 
 

7. In the curve half the wavelength is

 
 
 
 

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

 
 
 
 

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

 
 
 
 

10. Note is a sound

 
 
 
 

11. Children under the age of 5 can hear upto

 
 
 
 

12. Infrasound can be heard by

 
 
 
 

13. Sound travels in air if

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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