EXAMIANS
Infective bacteria in water is killed by the __________ process.
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Which of the following is a manmade source of air pollution?
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Presence of nitrates in water in excess of 50 ppm causes
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Out of the following, TLV of __________ is maximum (about 500 ppm).
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Which of the following sources is responsible for maximum air pollution?
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The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
YOUR ANSWER : ?
Presence of soluble organics in polluted water causes
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Presence of __________ in water stream are deleterious to aquatic life.
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Pick out the wrong statement pertaining to 'green house' for the plants.
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Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.
YOUR ANSWER : ?