To reduce noise pollution, which of the following devices must be installed on the vehicles ?

Lights

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Speedometer

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Horn

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Silencer

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Solution

The correct option is C Silencer
Lights in a vehicle are used to experience the view ahead of vehicle, in low light.
Speedometer is used to measure the speed of vehicle .
Horn is used to signal other vehicles, and a horn produces noise pollution.
Silencer in a vehicle is used to reduce the sound of the engine of vehicle, therefore it must be installed on the vehicles to reduce noise pollution .

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