Chapter - 3 Sound

Q&A -Ask Doubts and Get Answers

Q
Sound

Question:

In the following statements, tick ‘T’ against those which are true, and ‘F’ against those which are false.

(a) 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:

(a) True.

The sound needs a medium like air, water, steel etc. for its propagation. It cannot travel through a vacuum, because in the vacuum there are no particles to vibrate, which helps in propagation. 

(b) False.

The number of oscillations per second of a vibrating object is called its frequency, not the time period.

(c) False.

The sound with a small amplitude is feeble.

(d) True.

The human ear can hear the sound having a frequency in the range of 20 Hz to 20,000 Hz.

(e) False.

 Frequency is directly proportional to the pitch. The lower the frequency of vibration, the lower is the pitch.

(f) False.

An unwanted or unpleasant sound is termed as noise.

(g) True.

Noise pollution may cause partial hearing impairment.

 


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