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MHT-CET Sound — practice questions — page 2

Explore 68 free Sound questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Sound questions and exercises with answers

Showing questions 31–60 of 68.

In a rigid sealed box the air pressure rises from P0 to P and sound speed becomes 1.5 times. What is P/P0?Read the answer and worked solution →Overlapping waves add their displacements according to the principle ofRead the answer and worked solution →The repetition of a sound caused by reflection from a distant rigid surface is calledRead the answer and worked solution →With sound speed 344 m/s and a 0.1 s persistence of hearing, the minimum distance to hear an echo isRead the answer and worked solution →A person shouts near a cliff 66 m away. With sound speed 330 m/s, the echo returns afterRead the answer and worked solution →The persistence of sound after the source stops, due to repeated reflection, isRead the answer and worked solution →Which helps to reduce reverberation in a hall?Read the answer and worked solution →The branch of physics dealing with production, transmission and reception of sound isRead the answer and worked solution →For uniform sound distribution, the wall behind the speaker should beRead the answer and worked solution →Mixing of sound with echoes from regular structures like stairs causes theRead the answer and worked solution →Bats locate obstacles in darkness using pulses of which kind of sound?Read the answer and worked solution →Shock waves can be used in medicine toRead the answer and worked solution →What does the acronym SONAR stand for?Read the answer and worked solution →In SONAR, the depth of an object is found from theRead the answer and worked solution →The sharpness or shrillness of a sound is described by itsRead the answer and worked solution →When the frequency of a sound is increased, we perceiveRead the answer and worked solution →Identifying a friend's voice on a phone call relies mainly onRead the answer and worked solution →The SI unit of sound intensity isRead the answer and worked solution →The least audible intensity for a healthy human ear isRead the answer and worked solution →A sound of intensity equal to the threshold I0 has a loudness ofRead the answer and worked solution →A 40 dB sound has what intensity compared with a 20 dB sound?Read the answer and worked solution →A sound has intensity 10^-6 W/m2. Its loudness in decibels isRead the answer and worked solution →Doubling the distance from a point source changes intensity toRead the answer and worked solution →The Doppler effect is an apparent change in theRead the answer and worked solution →A 400 Hz source moves at 30 m/s toward a still listener. With v = 330 m/s the heard frequency isRead the answer and worked solution →If source and listener move with equal speeds so that relative motion is zero, the Doppler shift isRead the answer and worked solution →Relative approach of source and listener makes the recorded frequencyRead the answer and worked solution →For light, the Doppler effect depends only on theRead the answer and worked solution →Wind along the line joining source and listener alters the Doppler shift by changingRead the answer and worked solution →A rocket at 220 m/s approaches a target, emitting 1200 Hz (v = 330 m/s). Frequency at the target isRead the answer and worked solution →

Worked practice questions

In a rigid sealed box the air pressure rises from P0 to P and sound speed becomes 1.5 times. What is P/P0?

  1. 1.5
  2. 3.0
  3. 1.22
  4. 2.25
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Correct answer: D. 2.25

Density is constant so speed varies as the square root of P, giving P/P0 = 1.5 squared = 2.25.

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Overlapping waves add their displacements according to the principle of

  1. superposition
  2. reflection
  3. refraction
  4. polarisation
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Correct answer: A. superposition

The resultant displacement is the vector sum of the displacements due to each wave, which is superposition.

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The repetition of a sound caused by reflection from a distant rigid surface is called

  1. reverberation
  2. an echo
  3. resonance
  4. refraction
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Correct answer: B. an echo

A reflected, distinctly separate repetition of the original sound is an echo.

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