Q. A sound wave has a frequency of 440 Hz. What is its period?
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A.
0.00227 s
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B.
0.00455 s
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C.
0.01 s
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D.
0.1 s
Solution
The period (T) is the inverse of frequency (f), T = 1/f = 1/440 ≈ 0.00227 s.
Correct Answer: B — 0.00455 s
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Q. If a sound wave travels from air into water, what happens to its speed?
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A.
Increases
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B.
Decreases
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C.
Remains the same
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D.
Becomes zero
Solution
Sound travels faster in water than in air due to higher density.
Correct Answer: A — Increases
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Q. What is the decibel level of a sound that is 10 times more intense than the reference level of 0 dB?
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A.
10 dB
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B.
20 dB
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C.
30 dB
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D.
40 dB
Solution
A sound that is 10 times more intense than the reference level is 10 dB.
Correct Answer: A — 10 dB
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Q. What is the phenomenon called when sound waves bounce off a surface? (2021)
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A.
Refraction
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B.
Reflection
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C.
Diffraction
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D.
Interference
Solution
The bouncing back of sound waves from a surface is called reflection.
Correct Answer: B — Reflection
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Q. Which of the following materials would sound travel fastest through? (2019)
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A.
Air
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B.
Water
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C.
Steel
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D.
Wood
Solution
Sound travels fastest through solids like steel due to closely packed molecules.
Correct Answer: C — Steel
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