q paper 2 science ch 13 std 8 cbse
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QUESTION PAPER 2 – 2010
Class – VIII (CBSE)
Subject - Physics (Ch-13, Sound)
Time: 30 Minutes Max. Marks: 15
Date:
1. Fill in the blanks: [5]
(a) Loudness is determined by the .........................of vibration.(b) The unit of loudness of sound is..........................(c) Unwanted sound is called..........................(d) Shrillness of a sound is determined by the................. of vibration.(e) For Humans ………………………..is the audible range of frequency.
2. Name the organ in human which produce sound. [1]
3. What is eardrum? What id its function? [2]
4. What is frequency? What is its unit? [2]
5. What is noise pollution? What are its harmful effects? What are the measures to limit noise pollution? [3]
6. Sound needs medium for propagation. True or False [1]
7. The number of oscillations per second of a vibrating object is calledits time period. True or False [1]
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