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Physics
Force and Laws of Motion
CBSE
Class 9
Physics
Class 9 - Physics
Force and Laws of Motion
MCQ
Q&A
Test #
10
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1.
What is the minimum required distance of a reflective surface to produce an echo?
a.
33 m
b.
34.4 m
c.
17.2 m
d.
8.12 m
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