Sound Waves and their Properties, Simple Musical Instruments NDA Questions

NDA Physics

Sound Waves and their Properties, Simple Musical Instruments MCQ Questions


13.
The Doppler effect involves a change in observed frequency when
A.
The medium changes
B.
The speed of sound changes
C.
The amplitude changes
D.
The source or observer is moving
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ANSWER :
D. The source or observer is moving
14.
Sound cannot travel through
A.
Vacuum
B.
Gases
C.
Liquids
D.
Solids
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ANSWER :
A. Vacuum
15.
What is a node in a standing wave?
A.
A point where the wave has maximum amplitude
B.
A point where the wave has zero amplitude
C.
A point where the wave crosses the axis
D.
A point where frequency changes
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ANSWER :
B. A point where the wave has zero amplitude
16.
The speed of sound in air at 0 degrees Celsius is approximately
A.
331 m/s
B.
343 m/s
C.
300 m/s
D.
350 m/s
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ANSWER :
A. 331 m/s
17.
The unit used to measure the loudness of sound is
A.
Hertz
B.
Joules
C.
Decibels
D.
Meters
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ANSWER :
C. Decibels
18.
In a resonating tube, the first harmonic is also known as
A.
The fundamental frequency
B.
The second overtone
C.
The first overtone
D.
The frequency of zero
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ANSWER :
A. The fundamental frequency