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Chapter 13 Sound Solutions

Question - 1 : -
Sound can travel through
(a) gases only
(b) solids only
(c) liquids only
(d) solids, liquids and gases

Answer - 1 : -

(d) solids, liquids and gases.

Question - 2 : -
Voice of which of the following is likely to have minimum frequency?
(a) Baby girl
(b) Baby boy
(c) A man
(d) A woman

Answer - 2 : -

(b) Baby boy.

Question - 3 : -
In the following statements, tick ‘T’ against those which are true, and ‘F’ against those which are false:
(а) Sound cannot travel in vacuum.      (T/F)
(b) The number of oscillations per second of a vibrating object is called its time period.    (T/F)
(c) If the amplitude of vibration is large, sound is feeble.  (T/F)
(d) For human ears, the audible range is 20 Hz to 20,000 Hz.    (T/F)
(e) The lower the frequency of vibration, the higher is the pitch.    (T/F)
(f) Unwanted or unpleasant sound is termed as music.   (T/F)
(g) Noise pollution may cause partial hearing impairment.    (T/F)

Answer - 3 : -

(a) True
(b) False
(c) False
(d) True
(e) False
(f) False
(g) True.

Question - 4 : -
Fill in the blanks with suitable words:
(1) Time taken by an object to complete one oscillation is called…….
(2) Loudness is determined by the………..of vibration.
(3) The unit of frequency is………….
(4) Unwanted sound is called……….
(5) Shrillness of a sound is determined by the.……….of vibration.

Answer - 4 : -

  1. time period
  2. amplitude
  3. hertz (Hz)
  4. noise
  5. frequency.

Question - 5 : -
A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

Answer - 5 : -


Question - 6 : -
The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

Answer - 6 : -

Number of vibrations per second = 500
Time period = time taken for one vibration

Question - 7 : -
Identify the part which vibrates to produce sound in the following instruments:
(1) Dholak
(2) Sitar
(3) Flute

Answer - 7 : -

  1. Stretched membrane
  2. String of sitar
  3. Air column.

Question - 8 : -
What is the difference between noise and music? Can music become noise sometimes?

Answer - 8 : -

Unpleasant sounds are called noise whereas music is a sound, which produces pleasant sensation. But, if the musical sound is too loud, it becomes noise.

Question - 9 : -
List sources of noise pollution in your surroundings.

Answer - 9 : -

Following are the major sources of noise pollution:

  1. Sounds of vehicles.
  2. Sounds of bursting of crackers and explosives.
  3. Sounds of loudspeaker, TVs, transistors.
  4. Sounds of kitchen appliances.
  5. Sounds of desert coolers, air conditioners etc.

Question - 10 : -
Explain in what way noise pollution is harmful to humans.

Answer - 10 : -

Presence of excessive noise in the surroundings which are irritating and unacceptable, may cause many health related problems e.g.,

  1. Lack of sleep
  2. Hypertension
  3. Anxiety etc.

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