Question

3. The minimum distance for the occurrence of an echo is
(a) 12.6 m
(b) 15.6 m
(c) 16.6 m
d.20.6 m
4. Flute is an example of
instrument.
(a) stringed
(b) percussion
(c) wind
d.reed
5. The speed of sound in air is
(a) 332 cm s-1
(b) 332 m s -1
(c) 332 km s-1
d.non of these.
6. Of the following, which is a good reflector of sound?
(a) Metal
(b) Asbestos
(c) Paper
(d) none of these
(d) Cloth​

Answer 1

Answer:

3.b)

4.c)

5.a)

Explanation:

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Answer 2

Answer:

(3) 15.6

(4) wind

(5) 332ms-1

(6) metal