Class 9 Sound Quiz Set 1

1. Sound travels in air if

 
 
 
 

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

 
 
 
 

3. In the curve half the wavelength is

 
 
 
 

4. Infrasound can be heard by

 
 
 
 

5. Sound waves in air is an example of ______

 
 
 
 

6. In SONAR, we use

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

11. Children under the age of 5 can hear upto

 
 
 
 

12. Speed of sound depends upon

 
 
 
 

13. 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?

 
 
 
 

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

 
 
 
 

15. Note is a sound

 
 
 
 

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