Class 9 Sound Quiz Set 1

1. Children under the age of 5 can hear upto

 
 
 
 

2. 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?

 
 
 
 

3. Note is a sound

 
 
 
 

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

 
 
 
 

5. Speed of sound depends upon

 
 
 
 

6. In the curve half the wavelength is

 
 
 
 

7. Sound travels in air if

 
 
 
 

8. In SONAR, we use

 
 
 
 

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

 
 
 
 

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

 
 
 
 

11. Sound waves in air is an example of ______

 
 
 
 

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

 
 
 
 

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

 
 
 
 

14. Infrasound can be heard by

 
 
 
 

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

 
 
 
 

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