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CBSE Class 9 Sound — practice questions

Explore 50 free Sound questions in CBSE Class 9 Science. 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 1–30 of 50.

Sound is produced by:Read the answer and worked solution →The SI unit of frequency is:Read the answer and worked solution →In humans, the sound is produced by:Read the answer and worked solution →Sound CANNOT travel through:Read the answer and worked solution →The loudness of sound is measured in:Read the answer and worked solution →The range of frequencies AUDIBLE to a normal human ear is approximately:Read the answer and worked solution →The membrane that vibrates inside the ear and passes sound to the inner ear is called the:Read the answer and worked solution →The to-and-fro motion of an object is also called:Read the answer and worked solution →An object oscillates 100 times in 4 seconds. Its frequency is:Read the answer and worked solution →Loudness of a sound depends mostly on the:Read the answer and worked solution →Pitch (whether a sound is shrill or deep) depends mostly on the:Read the answer and worked solution →Whose voice typically has the HIGHEST frequency?Read the answer and worked solution →Sound is produced by:Read the answer and worked solution →Sound waves are an example of:Read the answer and worked solution →Sound CANNOT travel through:Read the answer and worked solution →In a sound wave, a region where the density of the medium is HIGHER than average is called a:Read the answer and worked solution →The human audible frequency range is approximately:Read the answer and worked solution →In which medium does sound travel FASTEST?Read the answer and worked solution →The wavelength λ, frequency ν, and speed v of a wave are related by:Read the answer and worked solution →An object oscillates 200 times in 5 seconds. Its frequency is:Read the answer and worked solution →Which characteristic of a sound wave determines its LOUDNESS?Read the answer and worked solution →A tuning fork produces a sound of frequency 256 Hz. If the speed of sound in air is 340 m/s, the wavelength of the sound in air is approximately:Read the answer and worked solution →Calculate the time period of a sound of frequency 50 Hz:Read the answer and worked solution →The minimum distance from a reflecting surface needed to hear a CLEAR echo (with speed of sound ≈ 340 m/s) is about:Read the answer and worked solution →A sonar pulse sent from a ship hits a submarine and returns after 0.90 s. Speed of sound in seawater is 1530 m/s. The distance to the submarine is:Read the answer and worked solution →An ultrasonic wave has a frequency of 50 kHz. If the speed of sound in air is 340 m/s, its wavelength is approximately:Read the answer and worked solution →In a longitudinal wave, particles vibrate:Read the answer and worked solution →A tuning fork produces sound by:Read the answer and worked solution →A region of HIGH air density in a sound wave is called a:Read the answer and worked solution →What does ν (the Greek letter nu) typically denote for a wave?Read the answer and worked solution →

Worked practice questions

Sound is produced by:

  1. Cold objects
  2. Heated objects only
  3. A vibrating body
  4. Stationary objects
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Correct answer: C. A vibrating body

All sounds — from a struck bell, a plucked rubber band, a hand-clap, a voice — are produced by a vibrating body. When the vibration stops, the sound stops.

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The SI unit of frequency is:

  1. Decibel (dB)
  2. Watt (W)
  3. Newton (N)
  4. Hertz (Hz)
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Correct answer: D. Hertz (Hz)

Frequency is the number of oscillations per second its SI unit is the hertz (Hz). 1 Hz = 1 oscillation per second.

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In humans, the sound is produced by:

  1. The tongue alone
  2. The eardrum
  3. The lungs alone
  4. The voice box (larynx), specifically the vocal cords
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Correct answer: D. The voice box (larynx), specifically the vocal cords

The voice box, or larynx, sits at the top of the windpipe. Two vocal cords are stretched across it with a narrow slit between them. When lungs push air through this slit, the cords vibrate and produce sound.

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