Q. Calculate the percentage of relative stability, given 5 day incubation period at 37°C.

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Q. _____ is the amount of oxygen required to oxidize both organic and inorganic matter in sewage.

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Q. COD is abbreviated as ___________

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Q. The oxidizing agent used in COD test is ___________

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Q. 5 days BOD at 20°C is ___ of total demand.

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Q. Which of the following expression is correct regarding deoxygenation constant where symbols have their usual meaning?

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Q. Which of the following is a prime lake pollutant?

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Q. The turbulence decreases the DO content of water.

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Q. The dilution factor is expressed by _____________

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Q. The tolerance limit of BOD of sewage to be disposed on land is ____________

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Q. The tolerance limit of pH value of sewage to be discharged into sea water is ____________

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Q. The dilution factor is 400. What should be the type of treatment given to the water?

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Q. The tolerance limit of oil and grease of sewage to be disposed on land is ____________

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Q. The minimum depth to which sewage should be discharged of sea water is ____________

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Q. The tolerance limit of COD of sewage to be discharged in sea water is ____________

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Q. The pollution zones in the river are divided into how many types?

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Q. In which pollution zone of the river, growth of algae reappear?

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Q. In which pollution zone of the river, the dissolved oxygen reduced to 0?

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Q. Which is the third zone of pollution in the river?

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Q. In which pollution zone of the river, water retains its original dissolved oxygen concentration?

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