CDS Questions on Sound

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CDS 2018-I

1. Sound waves cannot travel through a

  1. copper wire placed in air
  2. silver slab placed in air
  3. glass prism placed in water
  4. wooden hollow pipe placed in vacuum

CDS 2019-II

2. An echo is heard after 5 seconds of the production of sound which moves with a speed of 340 m/s. What is the distance of the mountain from the source of sound which produced the echo?

  1. 0.085 km
  2. 0.85 km
  3. 0.17 km
  4. 1.7 km

CDS 2020-I

3. The property of the sound waves that determines the pitch of the sound is its

  1. frequency
  2. amplitude
  3. wavelength
  4. intensity

CDS 2020-II

4. Which one of the following phenomena verifies the fact that light travels much faster than sound?

  1. Twinkling of stars in night sky
  2. Lighting of matchstick
  3. Thunderstorm
  4. Mirage

CDS 2021-II

5. A sound wave has a frequency of 4 kHz and wavelength 30 cm. How long will it take to travel 2.4 km?

  1. 2.0 s
  2. 0.6 s
  3. 1.0 s
  4. 8.0 s

CDS 2022-II

6. The pitch of a sound wave depends upon which one its following characteristics?

  1. Speed
  2. Loudness
  3. Amplitude
  4. Frequency

CDS 2023-I

7. A person burned a firecracker in front of a cliff and heard its echo 5 s after it burst. The distance of the cliff from the person, if the speed of the sound is 340 m/s, is close to

  1. 1700 m
  2. 170 m
  3. 85 m
  4. 850 m

8. Consider the following statements about the microphone and the speaker of a mobile phone:

  1. The microphone converts sound to a mechanical signal.
  2. The microphone converts sound to an electrical signal.
  3. The speaker converts a mechanical signal to sound.
  4. The speaker converts an electrical signal to sound.

Which of the statements given above are correct?

  1. 1 and 3
  2. 1 and 4
  3. 2 and 3
  4. 2 and 4

9. Sound and light waves are

  1. respectively longitudinal and transverse in air
  2. respectively transverse and longitudinal in air
  3. both longitudinal in air
  4. both transverse in air

CDS 2023-II

10. Sonic boom is produced when a source of sound travels at a speed:

  1. greater than the speed of sound.
  2. greater than the speed of light.
  3. lesser than the speed of sound.
  4. equal to the speed of sound.

11. In which of the following media is the speed of sound the maximum?

  1. Glass
  2. Stainless steel
  3. Water
  4. Oxygen


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CDS Solved Papers

CDS 2021 - I Solved Paper CDS 2021 - II Solved Paper CDS 2022 - I Solved Paper CDS 2022 - II Solved Paper CDS 2023 - I Solved Paper CDS 2023 - II Solved Paper