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1.
A tuning fork of frequency 340 Hz is vibrated just above the tube of 120 cm height. Water is poured slowly in the tube, what is the minimum height of water necessary for the resonance?
2.
For the stationary wave 
the distance between a node and the next antinode is
the distance between a node and the next antinode is
3.
A source is moving towards an observer with a speed of 
and having frequency of 
The observer is now moving towards the source with a speed of 
Apparent frequency herad by observer, if velocity of sound is 
is
and having frequency of The observer is now moving towards the source with a speed of Apparent frequency herad by observer, if velocity of sound is is
4.
The velocity of sound I air is 
. The rms velocity of air molecules 
is approximately equal to
. The rms velocity of air molecules is approximately equal to
5.
If the velocity of sound in air is 
The 
length of a closed pipe that would produce a just audible sound will be
The length of a closed pipe that would produce a just audible sound will be
6.
A whistle revolves in a circle with an angular speed of 
using a string of length 
If the frequency of sound from the whistle is 
then what is the minimum frequency heard by an observer, which is far away from the centre in the same plane? 
using a string of length If the frequency of sound from the whistle is then what is the minimum frequency heard by an observer, which is far away from the centre in the same plane?
7.
A car moving with a velocity of 
crosses a siren of frequency 500 Hz. The apparent frequency of siren after passing it will be
crosses a siren of frequency 500 Hz. The apparent frequency of siren after passing it will be
8.
Law of superposition is applicable to only
9.
The wavelength of two notes in air are 
m and 
m. each note produces 10 beats per second separately with a third note of fixed frequency. The velocity of sound in air in m/s is
m and m. each note produces 10 beats per second separately with a third note of fixed frequency. The velocity of sound in air in m/s is
10.
Two sound waves (expressed in CGS units) given by 
and 
interfere. The resultant amplitude at a place where phase difference is 
will be
and interfere. The resultant amplitude at a place where phase difference is will be