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CBSE class 8 sound questions (Fill in the blanks)




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This page contains cbse class 8 sound questions (Fill in the blanks) along with theit answers. We also have notes for this chapter that can be ascessed through links given below
Sound notes
  1. Loudness of sound depend on …………….
  2. Sound absorbing materials are required in auditoria to avoid ……………
  3. The property of sound that is used by animals to find their way and locate their food is………..
  4. The two kinds of sounds we cannot hear are ……………. And ………….
  5. ……………… of any kind is the principle source of production of sound.
  6. …………… instrument used in the laboratory to produce sound of a fixed frequency.
  7. Sound needs a …………….. medium for propagation.
  8. The vibrations of a simple pendulum are also known as ……………….
  9. A soft board will………………… most of the sound falling on it.
  10. The number of vibrations completed in one second is known as ………….
  11. ……………. Is proportional to the square of amplitude.
  12. If the thickness of the vibrating string is increased its pitch ………………
  13. Speed of sound highest in …………… medium.
  14. The range of audible frequency for the human ear is……………
  15. Noise is produced by……………..

 Answers:

  1. Amplitude
  2. Noise pollution
  3. Echo
  4. Infrasonic and Ultrasonic
  5. Vibrations
  6. Tuning fork
  7. Material
  8. Oscillations
  9. Absorb
  10. frequency
  11. Loudness
  12. Decrease
  13. solid
  14. 20Hz to 20,000Hz
  15. Irregular and non-periodic vibrations


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