Q. Radioactive contamination also known as:

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Q. Inorganic salts, mineral acids and metal compounds are:

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Q. Most of organic matter present in sewage is

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Q. In secondary treatment, solid reducers, ranges from

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Q. Waste water contains a variety of microorganism, includes: bacterias and

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Q. Which solids remain floating in sewage ?

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Q. How much BOD reduces in preliminary treatment ?

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Q. 'Oil' is a mixture of different

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Q. What does high velocity in river cause ?

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Q. Which treatment is usually accomplished by sedimentation?

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Q. What does sewage consist of ?

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Q. What are algae helpful for ?

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Q. 'BOD' oxidized by bacteria, resulting oxidization is known as

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Q. Secondary treatment reduces BOD, ranges from

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Q. What causes excessive growth of algae and other aquatic plants?

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Q. Addition of hydrogen and removal of oxygen, known as

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Q. Suspended solids and sediments increases turbidity of

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Q. Heavier suspended solids settle down, at point of outfall of waste water, known as:

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Q. Primary treatment reduces BOD, ranges from

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Q. Solubility of oxygen in water is directly proportional to

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