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GATE 2019 Environmental Engineering Day 2 Quiz (App update required to attempt this test)

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Question 1

Consider the following characteristics of E.Coli bacteria:
1) Gram negative
2) Spore-forming
3) Facultative anaerobic
4) Bacillus
Which of the above are correct?

Question 2

The Sludge Volume Index for mixed liquor having suspended solids concentration of 2000 mg/l and showing a settled volume of 200 ml from a one litre sample would be

Question 3

Consider the following statements in respect of anaerobic sludge digester:
1) It is less expensive compared to several other methods available.
2) Processing of separable solids impacts the environment to a minimum
3) Quantity of separated solids requiring disposal is minimal
4) Digested sludge is very readily dewaterable.
Which of the above statements are correct?

Question 4

What is the required plan size of a square sedimentation tank (as the primary sedimentation tank in sewage treatment), given that its effective dept is 3m, and the flow rate is 40 MLD with admissible surface loading of 100,000 l/m2/day?

Question 5

100 m3 of sludge holds a moisture content of 95%. If its moisture content changes to 90%, the volume of this sludge will then be

Question 6

A city generates kg of municipal solid waste (MSW) per year, out of which only 10% is recovered/recycled and the rest goes to landfill. The landfill has a single lift of 3 m height and is compacted to a density of If 80% of the landfill is assumed to be MSW, the landfill area (in m2, up to one decimal place) required would be __________.
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Jul 31ESE & GATE CE