Class 9 Sound Quiz Set 1

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

 
 
 
 

2. In the curve half the wavelength is

 
 
 
 

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

 
 
 
 

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

 
 
 
 

5. Sound travels in air if

 
 
 
 

6. In SONAR, we use

 
 
 
 

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

 
 
 
 

8. Sound waves in air is an example of ______

 
 
 
 

9. Children under the age of 5 can hear upto

 
 
 
 

10. Speed of sound depends upon

 
 
 
 

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

 
 
 
 

12. Infrasound can be heard by

 
 
 
 

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

 
 
 
 

14. 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?

 
 
 
 

15. Note is a sound

 
 
 
 

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