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Above what noise levels should hearing protector be worn by a worker?

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Above what noise levels should hearing protector be worn by a worker?

(a) 80 dB

(b) 85 dB

(c) 90 dB

(d) 95 dB
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Right choice is (b) 85 dB

Easiest explanation: Hearing protectors are one of the most important tools of safety measures. Every employee who works in a foundry, in a noise level above 85 decibels should wear a hearing protector as a safety measure.
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