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Subject :NSO    Class : Class 3

Q can hear the sound made by P in the shortest time, when the medium is a ___________.

A Brick wall
B Water
C Air
D Vacuum


where is Q and P, picture is missing

Ans 1:

Class : Class 4
answer is B or C as from brick wall sound can't be heard also from vacuumsound can't be heard

Ans 2:

Class : Class 3

Ans 3:

Class : Class 4

Ans 4:

Class : Class 1

Ans 5:

Class : Class 2

Ans 6:

Class : Class 3
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