EXAMIANS
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
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Infective bacteria in water is killed by the __________ process.
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Foul odour and bad taste of water is removed by treating with
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Carbonaceous particles having size less than 1 μm are called
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Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
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Which of the following sources is responsible for maximum air pollution?
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Color test of water is done with an instrument called
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Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
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Exposure to chemicals having carcinogenic properties cause
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The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
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