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Q 1.
1 hertz is equal to?
Ans.
60 vibration per minute.
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Q 2.
When the amplitude is small, the sound produces is?
Ans.
Feeble.
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Q 3.
What is the voice box?
Ans.
Larynx.
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Q 4.
How sound is produced?
Ans.
Vibrating objects only.
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Q 5.
Time taken by an objects to complete one oscillation is called?
Ans.
Time period.
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Q 6.
Unwanted sound is called?
Ans.
Noise.
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Q 7.
A pendulum oscillates 40 times in 4 seconds. What will be its frequency?
Ans.
10.
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Q 8.
A pendulum oscillates 40 times in 4 seconds. What will be its frequency?
Ans.
10.
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Q 9.
A pendulum oscillates 50 times in 5 seconds. What will be its time period?
Ans.
1/ 10.
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Q 10.
If the amplitude of sound increases twice, the loudness increases by?
Ans.
Four times.
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Q 11.
What is the unit of loudness of sound?
Ans.
Decibel.
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Q 12.
Loudness is determined by?
Ans.
Amplitude of vibration.
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Q 13.
Noise pollution may cause partially?
Ans.
Hearing impairment.
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Q 14.
Noise pollution may cause partially?
Ans.
Hearing impairment.
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Q 15.
What is the audible range of sound for human ears?
Ans.
20 Hz to 20,000 Hz.
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Q 16.
What is the order of speed of sound in increasing order?
Ans.
Gas, Liquid and Solid.
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Q 17.
When the sound becomes physically painful?
Ans.
When it exceeds 80 db.
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Q 18.
When the amplitude of vibration is large, sound is?
Ans.
Loud.
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Q 19.
Sound can not travel in?
Ans.
Vacuum.
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Q 20.
Sound can travel through?
Ans.
Solid, Liquid and Gases.
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