EXAMIANS
Biological oxidation ponds remove organic matters present in the polluted water by
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Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
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Which of the following is a manmade source of air pollution?
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For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
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Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
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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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COD of raw municipal sewage may be in the range of about __________ mg/litre.
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Which of the following is not a practical method of low level radioactive waste disposal?
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Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.
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Fresh sewage is __________ in nature.
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