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Question

Noise pollution is caused by which of the following?

A
Industrial machines
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B
Bursting of crackers
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C
Birds chirping
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D
Loudspeakers
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Solution

The correct options are
A Industrial machines
B Bursting of crackers
D Loudspeakers
The term noise is generally used as an unwanted sound, or sound which produces unpleasant effects and discomfort on the ears. Excessive noise leads to noise pollution. From the above, sounds produced by machines, crackers and loudspeakers are noises which cause noise pollution. Birds chirping is a pleasant sound.

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