Biology·MCQ Practice

Microbes in Sewage Treatment — MCQ Practice

NEET UG

Version 1Updated 21 Mar 2026

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Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 6 questions available.

Q1medium

Which of the following statements is INCORRECT regarding the role of microbes in sewage treatment?

Q2easy

A sample of wastewater has a BOD of $300,\text{mg/L}$ . After secondary treatment, its BOD is reduced to $30,\text{mg/L}$ . What percentage of BOD has been removed?

Q3easy

Which of the following gases is NOT a major component of biogas produced during anaerobic sludge digestion?

Q4easy

The activated sludge is pumped back into the aeration tank to:

Q5easy

Which of the following microbial groups is primarily responsible for the formation of flocs in the aeration tank during secondary sewage treatment?

Q6easy

If the BOD of a river water sample is very high, it indicates that the water is: