NCERT Class VIII Science Solutions: Chapter 13-Sound Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 1:

A list of mediums is given below.

  1. Wood
  2. Water
  3. Air
  4. Vacuum

In which of these mediums can sound travel?

  1. i & ii only
  2. i, ii & iii only
  3. iii & iv only
  4. ii, iii & iv only

Answer: B

Question 2:

The loudness of sound depends on:

  1. Its amplitude.
  2. Its frequency.
  3. Its time period.
  4. Its speed.

Answer: A

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Question 3:

Which of the following statements are correct?

  1. Sound is produced by vibrations.
  2. Sound requires a medium for propagation.
  3. Light and sound both require a medium for propagation.
  4. Sound travels slower than light.
  5. i & ii only
  6. i, ii & iii only
  7. ii, iii & iv only
  8. i, ii & iv only

Answer: D

Question 4:

An object is vibrating at 50 hertz. What is its time period?

Answer: A

Question 5:

In order to reduce the loudness of a sound we have to

  1. Decrease its frequency of vibration of the sound.
  2. Increase its frequency of vibration of the sound.
  3. Decrease its amplitude of vibration of the sound.
  4. Increase its amplitude of vibration of the sound.

Answer: C

Question 6:

Loudness of sound is measured in units of

Answer: A

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