GATE CE 2021 Paper 1 — page 8

Questions 22–24 of 65. Imported answers require review unless explicitly marked reviewed.

Which one of the following is correct?

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The partially treated effluent from a food processing industry, containing high concentration of biodegradable organics, is being discharged into a flowing river at a point P. If the rate of degradation of the organics is higher than the rate of aeration, then dissolved oxygen of the river water will be lowest at point P.

The most important type of species involved in the degradation of organic matter in the case of activated sludge process based wastewater treatment is chemoheterotrophs.

For an effluent sample of a sewage treatment plant, the ratio BOD₅-day,20°C upon ultimate BOD is more than 1.

A young lake characterized by low nutrient content and low plant productivity is called eutrophic lake.

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The liquid forms of particulate air pollutants are

Your answerChoose one option.

dust and mist

mist and spray

smoke and spray

fly ash and fumes

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The shape of the most commonly designed highway vertical curve is

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circular (single radius)

circular (multiple radii)

parabolic

spiral

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2021 · Paper 1

Question 12

Question 13

Question 14