Question

(d) medium to stop the sound to propagate completely
<(—) the most appropriate answer.
Sound can not travel through
(b) gases
(a) solids
(c) liquids
(d) vacuum
A tightly stretched membrane that separates, the outer, middle and inner ear is
(a) ear canal
(b) eardrum
(c) pinna
(d) None of these
Human hearing range is
(a) 15–10,000 Hz
(b) 20-20,000 Hz
(C) 20-60,000 Hz
(d) 30–60,000 Hz
Loudness of sound is proportional to the
(a) amplitude of vibration
(b) frequency
(c) square root of amplitude
(d) square of amplitude
The unit for measuring loudness of sound is
(a) hertz
(b) decibel
(c) pascal
(d) None of these
Unwanted or unpleasant sounds are called
(a) music
(b) noise
(c) both (a) and (b)
(d) None of these
Planting more trees will act as a
(a) means to produce sweet sound
(c) medium to reduce the loudness of the sound
(b) sound barrier to cut noise pollution
182 Interactive Science 8​

Answer 1

1.(d)
2.(d)
3.(b)
4.(d)
5.(a)
6.(b)
7.(d)