Which of the following are sources of noise pollution?

Airplanes

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Heavy machines

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Silencers

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Loudspeakers

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Solution

The correct option is D
Loudspeakers

Noise is unwanted sound which is unpleasant to ears. Following are some of the sources of noise pollution:

Heavy machines

Airplanes

Loud speakers

Old vehicles

Silencers are devices used to control noise pollution by reducing sound intensity.

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Which of the following are sources of noise pollution?

The correct option is D Loudspeakers Noise is unwanted sound which is unpleasant to ears. Following are some of the sources of noise pollution: Heavy machines Airplanes Loud speakers Old vehicles Silencers are devices used to control noise pollution by reducing sound intensity.

The correct option is D
Loudspeakers

Noise is unwanted sound which is unpleasant to ears. Following are some of the sources of noise pollution:

Heavy machines

Airplanes

Loud speakers

Old vehicles

Silencers are devices used to control noise pollution by reducing sound intensity.