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Sound Physics and Acoustics

Test your knowledge of sound physics including wave propagation, speed in different media, decibel levels, Doppler effect, resonance, and practical applications like SONAR and hearing aids.

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

A woman’s voice is shriller than a man’s voice due to _____.

  1. higher resonance
  2. higher wavelength
  3. higher frequency
  4. lower wavelength
Question 2 Multiple Choice (Single Answer)

Which of the following statements are correct for sound?
(a) Sound is produced whenever a body vibrates in a medium.
(b) The speed of sound does not depend on the elasticity of the medium.
(c) They are called as mechanical waves.
(d) The speed of sound is not affected by the change in pressure.

  1. Both (a) and (b)
  2. Both (a) and (c)
  3. Both (b) and (c)
  4. Both (b) and (d)
  5. Both (a) and (d)
Question 3 Multiple Choice (Single Answer)

We can hear sound when a body is in a _____ state.

  1. vibrating
  2. solid
  3. liquid
  4. gaseous
Question 4 Multiple Choice (Single Answer)

Which of the following statements about sound is incorrect?

  1. Sound needs a medium to travel.
  2. Speed of sound is fastest in gases and slowest in solids.
  3. Sound of frequency below the audible range is called infrasonic sound.
  4. Excessive sound in the environment causes noise pollution.
  5. Sound is produced by vibrating objects.
Question 5 Multiple Choice (Single Answer)

Consider the following statements:

  1. In vacuum, sound travels with the maximum speed.
  2. SONAR device uses infrasonic waves to measure the distance, direction and speed of underwater objects.
  3. In dark night, bats use ultrasonic waves to search the prey.

Which of the given statements is/are incorrect?

  1. Only (1)
  2. Only (2)
  3. Only (1) & (2)
  4. Only (1) & (3)
Question 6 Multiple Choice (Single Answer)

Which of the following statements is/are correct for sound?
(1) Sound is produced whenever a body vibrates in a medium.
(2) The speed of sound is affected by the change in pressure.

  1. Only (1)
  2. Only (2)
  3. Both (1) & (2)
  4. Neither (1) nor (2)
Question 7 Multiple Choice (Single Answer)

Consider the following statements:

  1. The astronaut cannot hear the sound on the surface of moon.
  2. Acoustics is the discipline of sound, which deals with the study of sound and vibrations in liquids.
    Which of the given statements is/are correct?
  1. Only (1)
  2. Only (2)
  3. Both (1) & (2)
  4. Neither (1) nor (2)
Question 8 Multiple Choice (Single Answer)

Consider the following statements:

  1. Sometimes a curved sound board may be placed behind the stage of an auditorium for the absorption of sound waves.
  2. Human heart produces 'lub' sound during contraction of heart.

Which of the given statements is/are true?

  1. Only (1)
  2. Only (2)
  3. Both (1) & (2)
  4. Neither (1) nor (2)
Question 9 Multiple Choice (Single Answer)

Match the following
(a) Telephone ringing (i) 210 dB
(b) Mosquito (ii) 80 dB
(c) Normal speech (iii) 70 dB
(d) Mixer grinder (iv) 40 dB
(e) Earthquake (v) 60 dB
  1. (a) - (iii), (b) - (iv), (c) - (v), (d) - (ii), (e) - (i)
  2. (a) - (iv), (b) - (v), (c) - (iii), (d) - (ii), (e) - (i)
  3. (a) - (ii), (b) - (i), (c) - (iv), (d) - (v), (e) - (iii)
  4. (a) - (iii), (b) - (i), (c) - (v), (d) - (ii), (e) - (iv)
Question 10 Multiple Choice (Single Answer)

Consider the following statements:

  1. Bells are made of metal and not of wood because density of the metal is greater than that of wood.
  2. The same musical note is played on different instruments at same loudness. It produces different sensations on the ear due to their different quality of sound.

Which of the given statements is/are incorrect?

  1. Only (1)
  2. Only (2)
  3. Both (1) & (2)
  4. Neither (1) nor (2)
Question 11 Multiple Choice (Single Answer)

Consider the following statements:

  1. If a person inhales helium, the person speaks with low pitched voice.
  2. In hearing aid, microphone converts the electrical signal to sound signal.

Which of the given statements is/ are incorrect?

  1. Only (1)
  2. Only (2)
  3. Both (1) & (2)
  4. Neither (1) nor (2)
Question 12 Multiple Choice (Single Answer)

Which of the following statements is/are correct for Doppler’s effect?

(1) It is the change in frequency of sound wave for a listener moving relative to its source.
(2) It is the reflection of sound, reaching the listener some time after the direct sound.

  1. Only (1)
  2. Only (2)
  3. Both (1) and (2)
  4. Neither (1) nor (2)
Question 13 Multiple Choice (Single Answer)

Consider the following statements:

(1) With rise in temperature, the speed of sound decreases.
(2) The speed of sound is greater in liquids than in solids.
(3) Supersonic jet planes travel faster than the speed of sound.

Which of the given statements is/are incorrect?

  1. Only (1)
  2. Only (2)
  3. Only (1) and (2)
  4. Only (2) and (3)
Question 14 Multiple Choice (Single Answer)

Consider the following statements:

(1) Caruso is said to have shattered a crystal chandelier with his voice. This is based on the principle of reverberation.
(2) If you repeatedly tap the side of a drinking glass with a spoon while filling it with water, you will notice that the pitch of the sound decreases.

Which of the given statements is/are correct?

  1. Only (1)
  2. Only (2)
  3. Both (1) and (2)
  4. Neither (1) nor (2)
Question 15 Multiple Choice (Single Answer)

If the diameter of Earth is doubled and the centre of gravity becomes half, the speed of sound

  1. becomes twice
  2. becomes doubled
  3. remains constant
  4. becomes one-third
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