Sample Questions — Microbes in sewage treatment
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MCQ
Secondary treatment is also called:
✅ Correct Answer: B
Involves growth of aerobic microbes that degrade organic matter.
MCQ
What is the first step in primary sewage treatment?
✅ Correct Answer: C
It removes floating debris from the sewage.
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MCQ
Where is the major part of activated sludge digested?
✅ Correct Answer: A
Sludge is decomposed by anaerobic bacteria.
MCQ
The anaerobic digestion of sludge produces:
✅ Correct Answer: D
Biogas (methane, CO₂, H₂S) is released during anaerobic digestion.
MCQ
What is the function of anaerobic sludge digesters?
✅ Correct Answer: A
Anaerobic bacteria digest sludge biomass to release gases like CH₄, H₂S.
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