Class 9 Sound Quiz Set 1

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

 
 
 
 

2. In SONAR, we use

 
 
 
 

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

 
 
 
 

4. Infrasound can be heard by

 
 
 
 

5. In the curve half the wavelength is

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

9. Speed of sound depends upon

 
 
 
 

10. Children under the age of 5 can hear upto

 
 
 
 

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

 
 
 
 

12. Sound waves in air is an example of ______

 
 
 
 

13. Note is a sound

 
 
 
 

14. Sound travels in air if

 
 
 
 

15. 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?

 
 
 
 

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