Term 3 Sound Three Marks

9th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 30
    10 x 3 = 30
  1. Name the device which is used to produce sound in laboratory experiments.

  2. Through which medium sound travels faster, iron or water? Give reason.

  3. What should an object do to produce sound?

  4. Can sound travel through vacuum?

  5. Name the physical quantity whose SI unit is ‘hertz’. Define.

  6. What is meant by supersonic speed?

  7. How does the sound produced by a vibrating object in a medium reach your ears?

  8. You and your friend are on the moon. Will you be able to hear any sound produced by your friend?

  9. The frequency of a source of sound is 600 Hz. How many times does it vibrate in a minute?

  10. A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. When is the splash heard at the top?
    (Given g = 10 m s–2 and speed of sound = 340 m s–1)

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