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Description: Sound (D)
Number of Questions: 15
Created by:
Tags: Sound (D) Physics Science and Technology Sound Vibrations- Forced and Natural General Science
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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

Show answer
Correct Option: C
Explanation:

Correct Answer: higher frequency

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)

Show answer
Correct Option: B
Explanation:

Sound is produced whenever a body vibrates in a medium. They are called as mechanical waves.

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

  1. vibrating

  2. solid

  3. liquid

  4. gaseous

Show answer
Correct Option: A

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.

Show answer
Correct Option: B
Explanation:

Speed of sound is fastest in solids and slowest in gases.

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)

Show answer
Correct Option: C
Explanation:

(I) Statement (1) is wrong. Sound needs a medium to travel like air, water, steel, etc. It cannot travel through vacuum.

(II) Statement (2) is wrong. SONAR device uses ultrasonic waves to measure the distance, direction and speed of underwater objects. The frequency of ultra sonic waves is more than 20 khz (more than audible range), which are detected by some special sensors. (III) Statement (3) is correct. Bats emit ultrasonic waves, which are reflected by the prey and then detected by them.

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)

Show answer
Correct Option: A
Explanation:

Statement (1) is correct. Whenever vibrations are produced in any medium (gas, liquid or solid), they arise sound. Statement (2) is incorrect. The sound pressure and the air pressure do not affect the speed of sound. There is a small dependence on humidity, due to the change in average air density, but by far the largest dependence is on temperature.

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)

Show answer
Correct Option: A
Explanation:
  1. Statement (1) is correct. Astronaut cannot hear the sound on the surface of moon because sound needs medium to travel, which is absent on moon.
    1. Statement (2) is wrong. Acoustics is the discipline of sound, which deals with the study of sound and vibrations in gases, liquids and solids.

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)

Show answer
Correct Option: B
Explanation:

Statement (1) is wrong. The curved sound board is placed behind the stage of an auditorium so that the sound after reflecting from the sound board spreads evenly across the width of the auditorium. Statement (2) is correct. Human heart produces 'lub dub' sound with contraction and relaxation of heart, respectively.

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)

Show answer
Correct Option: A
Explanation:

(a) Telephone ringing - 70 dB

(b) Mosquito - 40 dB

(c) Normal speech - 60dB
(d) Mixer grinder - 80 dB (e) Earthquake - 210 dB

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)

Show answer
Correct Option: A
Explanation:

(I) Statement (1) is wrong. The reason behind the manufacturing of bell by using metals, not using wood, is that wood dampens vibrations while metals are elastic. (II) Statement (2) is correct. Quality (or timbre) of the sound is the sensation received by the ear due to 'waveform'. Different instruments produce different waveform, which affects the quality of sound.

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)

Show answer
Correct Option: C
Explanation:

Statement (1) is wrong. If a person inhales helium, the person speaks with high pitched voice.

Sound moves at different speeds through different gases. As it is not a normal atmosphere, the sound moves faster, compressing the wavelength to a higher pitched noise. Statement (2) is wrong. In hearing aid, the sound is received by microphone by which sound signal converts to electrical signal.

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)

Show answer
Correct Option: A
Explanation:

Statement (1) is correct. Doppler’s effect is the change in frequency of sound waves for a listener moving relative to its source. Statement (2) is wrong. Reflection of sound, reaching the listener some time after the direct sound is called echo.

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)

Show answer
Correct Option: C
Explanation:
  1. Statement (1) is wrong. The speed of sound increases with an increase in temperature due to an increase in average molecular velocity. 2. Statement (2) is wrong. The speed of sound is greater in solid than in liquids because the solids have higher density. 3. Statement (3) is correct. The jet planes that travel faster than the speed of sound is known as supersonic jet planes.

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)

Show answer
Correct Option: B
Explanation:

Statement (1) is wrong. The shattering of crystal chandelier is based on the principle of resonance of sound. A driving force in tune with the natural frequency (sometimes known as the resonant frequency) of an oscillator can buildup larger amplitudes than the oscillator could alone. This buildup is known as resonance or sympathetic vibration.

Statement (2) is correct. 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. The length of the medium to travel the sound increases with the addition of water in glass and hence decreases the pitch of sound.

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

Show answer
Correct Option: C
Explanation:

The speed of sound remains the same because speed of sound is independent of centre of gravity.

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