Standing Waves in Strings and Organ Pipes, Fundamental Mode and Harmonics, Beats NEET Questions

Physics - Oscillations and Waves

Standing Waves in Strings and Organ Pipes, Fundamental Mode and Harmonics, Beats MCQ Questions


1.
In a string fixed at both ends, the fundamental frequency is given by:
A.
v/2L
B.
2v/L
C.
v/L
D.
L/2v
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ANSWER :
A. v/2L
2.
The third harmonic in a closed organ pipe is actually the:
A.
Fifth overtone
B.
First overtone
C.
Third overtone
D.
Second overtone
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ANSWER :
B. First overtone
3.
The frequency of beats produced by two sound waves of frequencies 256 Hz and 260 Hz is:
A.
2 Hz
B.
516 Hz
C.
258 Hz
D.
4 Hz
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ANSWER :
D. 4 Hz
4.
When two sound waves of nearly equal frequencies interfere, the phenomenon observed is called:

NEET - 2019

A.
Resonance
B.
Doppler effect
C.
Beats
D.
Interference
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ANSWER :
D. Interference
5.
In an open organ pipe, the harmonics present are:
A.
No harmonics
B.
Only odd harmonics
C.
Even harmonics only
D.
All harmonics
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ANSWER :
D. All harmonics
6.
The wavelength of the fundamental mode of vibration of a string of length L fixed at both ends is:
A.
4L
B.
L/2
C.
L
D.
2L
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ANSWER :
D. 2L