Air Pollution MCQs

Ringelmann chart No. 2 corresponds to __________ percent black smoke.

December 29, 2021

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Ringelmann chart No. 2 corresponds to __________ percent black smoke.

Q. Ringelmann chart No. 2 corresponds to __________ percent black smoke.

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Answer: Option 3

Ringelmann chart No. 2 corresponds to __________ percent black smoke.

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Maximum permissible residual chlorine in treated water should be __________ mg/liter.

Ringelmann chart No. 2 corresponds to __________ percent black smoke.

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The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

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