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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Q. The fishes were present in the river, but algaes were not able to survive. What is the zone of pollution of the river?

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Q. In which pollution zone of the river, the concentration of D.O reduced to 40%?

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Q. The reoxygenation constant at temperature ‘T’ is expressed by ___________

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Q. ______ zone lies between Euphotic and Benthic zone.

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Q. The uppermost zone in lakes is called as ____________

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Q. _______ is the process of overgrowth of plants and algae in lakes.

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Q. Which of the following promotes eutrophication of lakes?

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Q. In which zone, decomposition of the dead organism takes place?

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Q. Which one of the following lakes has minimum productivity?

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