EXAMIANS
Presence of __________ in water stream are deleterious to aquatic life.
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Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.
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The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water
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Thermal pollution due to excessive heat & temperature in the working place causes
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Inhalation of silica dust causes a disease called
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Polluted water having low BOD are most economically treated in
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Most of the bacteria in sewage are
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Dose of chlorine for disinfection of water is about __________ mg/litre of water.
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Threshold limit value (TLV) of CO in air is __________ ppm.
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High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
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