Science
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.
Sound
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Answer
(a) Time taken by an object to complete one oscillation is called time period.
(b) Loudness is determined by the amplitude of vibration.
(c) The unit of frequency is hertz.
(d) Unwanted sound is called noise.
(e) The shrillness of a sound is determined by the frequency of vibration.
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(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)