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)#new_question Fill in the blanks with suitable words. (a) Time taken by an object to complete one oscillation is called _________. (b) Loudness is determined by the ________ of vibration. (c) The unit of frequency is _________. (d) Unwanted sound is called _________. (e) Shrillness of a sound is determined by the _________ of vibration.

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