Q1. Sound travels fastest in:
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Answer: B. Solids
Sound speed is generally highest in solids, lower in liquids and lowest in gases.
Physics - Sound Questions for SSC CGL (with Answers)
11 Physics - Sound MCQs from the General Awareness section, with answers and short explanations.
Score: 0 / 0
Q2. The unit used to measure the intensity level (loudness) of sound is:
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Answer: D. Decibel
Sound intensity level is expressed in decibels (dB).
Q3. Sound cannot travel through:
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Answer: D. Vacuum
Sound is a mechanical wave and needs a medium, so it cannot travel through a vacuum.
Q4. The audible range of frequency for a normal human ear is about:
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Answer: C. 20 Hz to 20,000 Hz
Humans can typically hear sounds from about 20 Hz to 20 kHz.
Q5. SONAR, used to locate objects under water, makes use of:
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Answer: B. Ultrasonic waves
SONAR sends ultrasonic pulses and detects their echoes.
Q6. The persistence of sound due to repeated reflections in a hall is called:
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Answer: B. Reverberation
Reverberation is the persistence of sound from multiple reflections.
Q7. A sound wave has frequency 500 Hz and wavelength 0.68 m. Its speed is:
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Answer: C. 340 m/s
v = 500 × 0.68 = 340 m/s.
Q8. Loudness of a sound depends on its:
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Answer: B. Amplitude
Loudness depends on the amplitude of vibration.
Q9. The pitch of a sound depends on its:
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Answer: C. Frequency
Pitch is determined by frequency; higher frequency means higher pitch.
Q10. A ship sends an ultrasonic signal and receives its echo from the seabed after 2 s. If sound travels at 1500 m/s in sea water, the depth of the sea is:
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Answer: C. 1500 m
Depth = (1500 × 2)/2 = 1500 m.
Q11. To hear a distinct echo, the minimum distance of the reflecting surface from the listener in air (speed of sound ≈ 344 m/s) should be about:
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Answer: B. 17.2 m
Total path = 344 × 0.1 = 34.4 m, so the reflector must be about 17.2 m away.
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