# WAVES (TEST-2)

The fundamental note produced by a closed organ pipe is of frequency  The fundamental note produced by an open organ pipe of same length is of frequency ____.
If the velocity of sound in air is 350 m/s. Then the fundamental frequency of an open organ pipe of length 50 cm is ____.
350 Hz
175 Hz
900 Hz
750 Hz
An air column in a pipe, which is closed at one end, is in resonance with a vibrating body of frequency 166 Hz, if the length of the air column is ____.
2.00 m
1.50 m
1.00 m
0.50 m
It is desired to increase the fundamental resonance frequency in a tube which is closed at one end. This can be achieved by ____.
replacing the air in the tube by hydrogen gas
increasing the length of the tube
double the length of the tube
remains the closed end of the tube
An empty vessel is partially filled with water, then the frequency of vibration of air column in the vessel ____.
remains same
decreases
increases
first increases then decreases
The first overtone in a closed pipe has a frequency ____.
same as the fundamental frequency of an open tube of same length
twice the fundamental frequency of an open tube of same length
same as that of the first overtone of an open tube of same length
None of the above
A closed pipe and an open pipe have their first overtones identical in frequency. Their lengths are in the ratio ____.
1 : 2
2 : 3
3 : 4
4 : 5
A tube closed at one end and containing air is excited. It produces the fundamental note of frequency 512 Hz. If the same tube is open at both the ends the fundamental frequency that can be produced is ____.
1024 Hz
512 Hz
256 Hz
128 Hz
/
A simple pendulum oscillates in air with time period T and amplitude A. As the time passes ____.
T and A both decrease
T increases and A is constant
T increases and A decreases
T decreases and A is constant
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WAVES

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