Q. What is most common dissolved gas in water?

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Q. Nitrogen in sewage indicates presence of

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Q. What affects velocity and surface expansion of river?

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Q. In first stage of aerobic decomposition, carbonaceous matter is being

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Q. Nitrogen free compound includes:

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Q. Sewage obtained from domestic premises as well as commercial and industrial buildings, known as

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Q. Waste water contains algae, fungi, bacteria and

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Q. Main sources of nitrogen compounds in waste water are proteins, amines, and

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Q. Secondary treatment is carried out for removal of

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Q. Rate of oxidation depends on amount of:

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Q. In secondary treatment, decomposition of organic matters is carried out by

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Q. 'volatile solids' represents the

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Q. Anaerobic decomposition is also known as

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Q. Some common type of compounds present in crude oil are:

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Q. 'turbidity' increases as long as sewage becomes

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Q. Floating materials in preliminary treatment includes:

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Q. Rise in temperature due to heat from power plant and industries is known as

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Q. What does help in reaeration from atmosphere?

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Q. What causes erosion of concrete degradation?

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Q. Which microorganism is responsible for cholera, typhoid, dysentery?

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