## 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

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

## 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

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

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

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

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

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

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