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.Management Sciences
A. aerobic bacteria only
B. algae only
C. dual action of aerobic bacteria and anaerobic bacteria
D. sedimentation
Related Mcqs:
- The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of________________?
- A. 1 mg/litre B. 10 mg/litre C. 100 mg/litre D. 1000 mg/litre...
- The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is________________?
- A. circle method B. equivalent pipe method C. electrical analysis method D. Hardy cross method...
- For normal sludge, the value of sludge index for Indian conditions is________________?
- A. 0 to 50 B. 50 to 150 C. 150 to 350 D. 350 to 500...
- Period of cleaning of slow sand filters is about________________?
- A. 24 – 48 hours B. 10-12 days C. 2-3 months D. 1-2 year...
- The velocity of flow of water in a sedimentation tank is about__________________?
- A. 5 to 10 cm/sec. B. 15 to 30 cm/sec. C. 15 to 30 cm/minute D. 15 to 30 cm/hour...
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