Science - 11th lesson - 2nd term - v

 SCIENCE 
GRADE 7 - 2ND TERM 
11th LESSON - SOUND

1. sound is generated due to a, 
                                                
         .............................................................................................................

2. Vocal sound is produce because of the, 

 .......................................................................................................................................................

3. Name three types of sound resources. 

 .................................................................          .......................................................................
 
                       ..............................................................................................

4. Name the instruments belongs to those sound resources.

 i - ............................................................................................................................................

ii - .............................................................................................................................................

iii - .............................................................................................................................................

5. Defined what is vibration. 

 ..................................................................................................................................................

6. In the space 2 astronauts can't hear each other. what is the reason for that ?

 ...................................................................................................................................................

....................................................................................................................................................

7. What is necessary for the propagation of sound. 

...................................................................................................................................................

8. The fastest medium is, 

 ...................................................... medium 

9. Speed of the sound is least in .................................................. medium. 

10. Speeds of sounds according to the medium.
 
Water - ......................................................................................

solid - ........................................................................................

liquid - ......................................................................................

11. Write the observation of The below activity. 



Observation - ...................................................................................

12. This is a picture of a, 

...............................................................................................


MADE BY THISENI WEERASINGHE 





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