Q. 'Polychlorinated biphenyls' are by products of plastics, lubricants, rubber and

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Q. Microbiological pollutants, cause sickness in humans, known as

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Q. What causes bad odour in waste treatment plant?

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Q. Which organism respire in absence of oxygen ?

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Q. Pesticide pollution is due to 'leachate' from agricultural and

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Q. Human faeces is main source of organism, in

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Q. What does an inorganic compounds contain ?

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Q. Secondary treatment reduces bacterial load, ranges from

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Q. Composition of sewage water depends on its

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Q. Finely divided solid, remaining either with in solution or in suspension is known as

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Q. Which is chief source of nitrogenous matter urea ?

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Q. Phosphorous, is needed for the

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Q. Primary treatment reduces bacterial load, ranges from

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Q. Cyanides are toxic to all biological life, prevents enzyme action, as well as immobilize the

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Q. What reduces water quality ?

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Q. Low 'pH' of a sewage indicates its

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Q. Soil, sand and other solids are washed into water bodies due to

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Q. Which bacteria flourish in absence of free dissolved oxygen in sewage?

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Q. 'Polychlorinated biphenyls' cause harm to

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Q. An example of industrial effluent toxic substance is

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