Q. Secondary treatment is also known as

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Q. What is important to support marine animals in water bodies?

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Q. Presence of hydrogen sulphide indicates anaerobic

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Q. In higher temperature, D.O concentration of water molecules is, comparatively

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Q. Which bacteria consumes organic matter as their food, and thus oxidizing it to stable end product?

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Q. 'Aerobic' decomposition takes place in

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Q. Temperature affects dillusion, sedimentation and

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Q. Organic matter, which can be decomposed by bacteria is known as

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Q. Soil, silt washing from land surfaces, fertilizers, insecticides are known as

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Q. Chlorides are mineral salts, and cannot be affected by

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Q. Leftover material in secondary treatment is used as

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Q. Which bacteria can flourish and carry out decomposition of organic matter, both in presence and absence of oxygen?

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Q. Settle out portion of 'sewage' is known as

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Q. What are characteristics of 'domestic' wastewater ?

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Q. Acids and alkalies collectively, change 'pH' value of

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Q. Industrial, municipal sewage, treatment plants are examples of

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Q. 'fixed' solids represents

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Q. What compounds form fats and oils ?

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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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