CHAPTER-13, SOUND

1. Unwanted sounds are called

 
 
 
 

2. The loudness of sound depends on

 
 
 
 

3. Frequency is expressed in

 
 
 
 

4. The loudness of sound is determined by its

 
 
 
 

5. Which of the following are used to study the growth of foetus inside the mother’s womb?

 
 
 
 

6. The loudness of sound is determined by its

 
 
 
 

7. In order to reduce the loudness of a sound, we have to

 
 
 
 

8. Loudness of sound is measured in units of

 
 
 
 

9. The maximum displacement of a vibrating body from its mean position is called

 
 
 
 

10. Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels slower than light.

 
 
 
 

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