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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Q. ________ is the process of acceleration of eutrophication due to increased phosphorous content in lakes.

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Q. The eutrophication process leads to turbidity in lakes.

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Q. Which type of pollution is Cultural eutrophication?

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Q. The lakes are classified into how many types on the basis of productivity?

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Q. The depth of Euphotic zone is measured by ____________

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Q. How many types of aerators are commonly used in the treatment of wastewater?

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Q. Organic contaminants are removed from the wastewater by ____________

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Q. By which process, odor producing substances are oxidized?

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Q. Which of the following process is used to remove the colloidal particles from the effluent?

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Q. In which form of solute stabilization, hydrogen sulfide in the effluent is oxidized into sulfate?

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Q. In which unit operation, gases are released or absorbed in the effluent?

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Q. Which form of solute stabilization occurs when effluent passes through limestone?

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Q. Solids are removed from the wastewater by which of the following unit operation?

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Q. Dealkalization results in removal of all the ions from the wastewater.

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