Q. Maximum permissible residual chlorine in treated water should be __________ mg/litre.

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Q. Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ?

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Q. Which is the most widely used coagulant for the treatment of turbid water ?

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Q. Which of the following is not a natural source of air pollution ?

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Q. Which of the following industries discharge mercury as a pollutant ?

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Q. Threshold limit value (TLV) of CO in air is __________ ppm.

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Q. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes

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Q. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by

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Q. In large thermal power stations very fine particulates present in flue gas are removed by

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Q. Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

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Q. Photochemical smog is formed from automobile exhaust

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Q. Reinglemann chart is used for the measurement of the

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Q. Disinfection of water is done to remove

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Q. Which of the following fine dust removal equipments is the most efficient ?

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Q. The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

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Q. Inorganic impurities causing water pollution is

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Q. The main type of sludge gas evolved during sewage treatment in Imhoff tank is

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Q. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.

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Q. The pH value of oxidised sewage is about

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Q. Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

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