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Questions on Sound

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NDA/NA 2019 - II Exam

1. The loudness of sound depends upon the

  1. velocity of sound waves in the medium.
  2. amplitude of the sound waves.
  3. frequency of the sound waves.
  4. frequency and velocity of the sound waves.

2. Compared to audible sound waves, ultrasound waves have

  1. higher speed.
  2. higher frequency.
  3. longer wavelength.
  4. both higher speed and frequency.

NDA/NA 2020 - II Exam

3. Which of the following statements is NOT correct regarding the travel of sound waves?

  1. Sound waves can travel through water
  2. Sound waves can travel through air
  3. Sound waves can travel through steel
  4. Sound waves can travel through vacuum

4. Which one of the following statements about sound is NOT correct?

  1. Sound travels at a speed slower than the speed of light
  2. Sound waves are transverse waves
  3. Sound waves are longitudinal waves
  4. Sound travels faster in moist air than in dry air

NDA/NA 2021 - I Exam

5. The sound created in a big hall persists because of the repeated reflections. The phenomenon is called

  1. Reverberation
  2. Dispersion
  3. Refraction
  4. Diffraction

6. Which one of the following cannot be the unit of frequency of a sound wave?

  1. dB
  2. s-1
  3. Hz
  4. min-1

NDA/NA 2021 - II Exam

7. Reverberation is a phenomenon associated with a

  1. multiple refraction of sound.
  2. multiple reflection of sound.
  3. single refraction of sound.
  4. single reflection of sound.

8. Which among the following is true for propagation of sound waves?

  1. Sound can travel in vacuum and it is a transverse wave in air.
  2. Sound cannot travel in vacuum and it is a longitudinal wave in air.
  3. Sound can travel in vacuum and it is a longitudinal wave in air.
  4. Sound cannot travel in vacuum and it is a transvers wave in air.

NDA/NA 2022 - I Exam

9. A sound wave has a frequency of 1 kHz and wavelength 50 cm. How long will it take to travel 1 km??

  1. 5 s
  2. 4 s
  3. 3 s
  4. 2 s

NDA/NA 2022 - II

10. When the pitch of sound increases, which one of the following increases?

  1. Intensity
  2. Loudness
  3. Wavelength
  4. Frequency

11. The amplitude of sound waves is measured in the units of

  1. pressure
  2. distance
  3. time
  4. speed

12. SONAR is a device that is used to measure the distance of underwater objects by a ship. Which of the following types of waves does it use for this purpose?

  1. Infrasonic waves
  2. Sound waves in audible range for human beings
  3. Ultrasonic waves
  4. All of the above

13. Which one of the following statements about the speed of sound waves is NOT correct?

  1. The speed of sound waves in steel is higher than that in water.
  2. The speed of sound waves in air decreases with increase in temperature.
  3. The speed of sound waves in air increases with increase in temperature.
  4. The speed of sound waves in water is higher than that in air.

14. The part of the human ear that converts the pressure variations associated with audible sound waves to electrical signals is

  1. auditory nerve
  2. cochlea
  3. eardrum
  4. eustachian tube

15. A microphone converts

  1. electrical signals to sound waves
  2. sound waves to electrical signals
  3. microwave to sound waves
  4. sound waves to microwaves

NDA/NA 2023 - I

16. Which one among the following is true for the speed of sound in a given medium?

  1. Speed of sound remains same at all frequencies
  2. Speed of sound is faster at higher frequencies
  3. Speed of sound is slower at higher frequencies
  4. Speed of sound is slower at higher wavelengths

NDA/NA 2023 - II

17. The flash of lightning is seen before the thunderstorm is heard. It verifies that

  1. sound travels much faster than light
  2. light travels much faster than sound
  3. light and sound both travel with same speed
  4. intensity of flash of lightning is very high during thunderstorm

18. Which one of the following statements is true for sound waves propagating in air?

  1. Sound is an electromagnetic wave and transverse in nature
  2. Sound is a mechanical wave and longitudinal in nature
  3. Sound is a mechanical wave and transverse in nature
  4. Sound is an electromagnetic wave and longitudinal in nature

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