Physics · Science General
Acoustics and Sound Waves
2,160 Questions
Acoustics and sound waves deal with mechanical vibrations traveling through media like air and water. Key concepts include wave reflection, beats, echoes, the Mach number, and infrasound. These physics fundamentals are regularly tested in general science sections of multiple competitive exams.
Sound wave propagationEchoes and reflectionWave interferenceMach numberInfrasound frequency
Acoustics and Sound Waves Questions
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Solid > Liquid > Gas
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Solid < Liquid < Gas
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Gas < Solid < Liquid
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Solid = Liquid = Gas
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Solid placed in vaccum > Solid placed in air
A
Correct answer
Explanation
True, the speed of sound is maximum in solids, then in liquids, and lowest in gases.
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The frequency is less.
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The amplitude is less.
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The time period is less.
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The time period is more.
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The amplitude is more.
B
Correct answer
Explanation
When amplitude is more, the louder will be the sound and when the amplitude is less then the loudness will be lesser.
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Subsonic vibrations
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Supersonic vibrations
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Sonic vibrations
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Ultrasonic vibrations
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Infrasonic vibrations
D
Correct answer
Explanation
The Galton whistle produces ultrasonic vibrations which can be heard only by the dogs.
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Timbre
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Pitch
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Frequency
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Noise
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Amplitude
A
Correct answer
Explanation
The characteristic quality of sound produced by a particular instrument or voice; tone colour.
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The Timbre is high.
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The amplitude is high.
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The frequency of sound is low.
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The frequency of sound is high.
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The amplitude is low.
D
Correct answer
Explanation
The higher the frequency, the shriller will be the sound.
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It is because the frequency of sound is high
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The amplitude is high
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The pitch is high
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The amplitude is low
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The Timbre is high
B
Correct answer
Explanation
The higher the amplitude, the louder will be the sound. Amplitude is directly proportional to the loudness.
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radio signals
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sound signals
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electric signals
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digital signals
B
Correct answer
Explanation
The electrical oscillations obtained from a microphone corresponding to the sound waves are called sound signals.
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The sound produced by a bird has larger amplitude than the sound produced by a lion.
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The sound produced by a bird has higher frequency than the sound produced by a lion.
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The sounds produced by a bird and a lion have the same frequency.
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The sounds produced by a bird and a lion have the same amplitude.
B
Correct answer
Explanation
The faster the vibration of the source, the higher the frequency and the higher the pitch. Thus, the sound produced by a bird has higher frequency than the sound produced by a lion.
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increase
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decrease
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remain the same
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None of these
A
Correct answer
Explanation
In Doppler effect, when the sound moves towards the receiver at rest, the frequency of sound heard will increase.
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20–10,000 Hz
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20–20,000 Hz
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15-50,000 Hz
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60–65,000 Hz
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Resonance
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Doppler effect
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Beats
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Treble
B
Correct answer
Explanation
Doppler effect is the method employed by the traffic police to measure the speed of the vehicles.
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resonance
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beats
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bass
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treble
C
Correct answer
Explanation
A group of sound waves of low pitch is called as bass.
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10 kHz
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18,000 Hz
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15 Hz
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25 Hz
C
Correct answer
Explanation
For a human ear, the range of audible frequency is from 20 to 20,000 Hz. Sounds of frequencies less than 20 Hz and higher than 20 kHz (i.e. 20,000 Hz) are inaudible to the human ear.
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It depends on the source from which it is generated.
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It remains constant under all conditions.
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It depends on the type of wave generated.
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It depends on the properties of medium through which it is propagating.
D
Correct answer
Explanation
The speed of sound depends on the properties of the medium through which it travels.
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Infrasonic waves
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Ultrasonic waves
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Ultraviolet waves
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Reverberation waves
B
Correct answer
Explanation
Bats search their prey and fly in the night by emitting and detecting reflections of ultrasonic waves.