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

(a) Sound cannot travel in a 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 the vibration is large, the 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)

(a) Sound cannot travel in a vacuum. — True

(b) The number of oscillations per second of a vibrating object is called its time period. — False
Reason — The number of oscillations per second of a vibrating object is called its frequency.

(c) If the amplitude of the vibration is large, the sound is feeble. — False
Reason — If the amplitude of the vibration is large, the sound is loud.

(d) For human ears, the audible range is 20 Hz to 20,000 Hz. — True

(e) The lower the frequency of vibration, the higher is the pitch. — False
Reason — The lower the frequency of vibration, the lower is the pitch.

(f) Unwanted or unpleasant sound is termed as music. — False
Reason — Unwanted or unpleasant sound is termed as noise.

(g) Noise pollution may cause partial hearing impairment. — True