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Wave Motion & Sound

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## Amartya
the waves used for a communication through artificial satellite are….1)radio waves in the FM band…2) radio waves in the AM band..3)microwaves…4) none of the above

microwaves

eta ekta site e 3 to blche.. tao ekbar dkte hbe

## Amartya
The loudness of sound is related to…1) its frequency..2)its amplitude…3) its speed…4) its pitch

2)its amplitude…

## Amartya
A noise level of 100 decibel would corresponds to…1)sound from a noisy street…2) just audible sound…3) noise from machine shop…4) ordinary conversation

3) noise from machine shop…

## Amartya
Sound waves do not exhibit the phenomenon of..1) refraction..2)interference..3) polarisation…4)diffaraction

3) polarisation…

The speed of sound will be highest in—-
a. dry air at 0 degree c
b. dry air at 30 degree c
c. humid air at 0 degree c
d. humid air at 30 degree c

d. humid air at 30 degree c

When a sound wave goes from one medium to another, the quantity that remains unchanged is
(a) frequency (b) amplitude
(c) wavelength (d) speed

(a) frequency

A womans voice is shriller than aman’s due to
a. higher frequency
b. higher amplitude
c. lower frequency
d. weak voval cords

a. higher frequency

A womans voice is shriller than aman’s due to
a. higher frequency
b. higher amplitude
c. lower frequency
d. weak voval cords

c. lower frequency

a. higher frequency

A shrill sound has a ______ pitch and a dull sound has a _____ pitch.
(a) high, low (b) low, high
(c) low, low (d) high, high

(a) high, low

The pitch of shortness of a sound depends on-
The frequency of vibration /vibration / temperature / pressure

The frequency of vibration

a

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