Sound Waves and their Properties, Simple Musical Instruments NDA Questions

NDA Physics

Sound Waves and their Properties, Simple Musical Instruments MCQ Questions


7.
What happens to the speed of sound as the temperature of air increases?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
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ANSWER :
A. It increases
8.
What is the term for a sound wave that has a frequency below human hearing?
A.
Ultrasound
B.
Infrasound
C.
Supersound
D.
Extrasound
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ANSWER :
B. Infrasound
9.
The property of sound that determines its pitch is
A.
Amplitude
B.
Frequency
C.
Speed
D.
Wavelength
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ANSWER :
B. Frequency
10.
In sound waves, compressions and rarefactions refer to
A.
Regions of high and low pressure, respectively
B.
Areas of high and low frequency, respectively
C.
Differences in wave amplitude
D.
None of the above
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ANSWER :
A. Regions of high and low pressure, respectively
11.
If a sound wave has a high frequency, its pitch is generally
A.
Low
B.
High
C.
Indeterminable
D.
The same as a low-frequency wave
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ANSWER :
B. High
12.
What is the typical range of human hearing in Hz?
A.
10 to 20,000
B.
20 to 50,000
C.
0 to 10,000
D.
20 to 20,000
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ANSWER :
D. 20 to 20,000