EXAMIANS
A shallow pond in which the sewage is retained and biologically treated is called
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Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).
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Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
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The pH value of potable water should be between
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If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is(i) Presumptive coli-form test(ii) Confirmed coli-form test(iii) Completed coli-form test
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Noise level inside a jet air liner in normal flight is about __________ decibels.
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Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
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Which of the following acts as a natural source of air pollution?
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Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).
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Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
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