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.Management Sciences
Category: Environmental Engineering
In facultative stabilization pond, the sewage is treated by________________?
A. aerobic bacteria only
B. algae only
C. dual action of aerobic bacteria and anaerobic bacteria
D. sedimentation
The settling velocity of a particle in a sedimentation tank depends on__________________?
A. depth of tank
B. surface area of tank
C. both depth and surface area of tank
D. none of the above
The overflow rate for plain sedimentation tanks is about__________________?
A. 500 to 750 litres/hour/ m2
B. 1000 to 1250 litres/hour/ m2
C. 1250 to 1500 litres/hour/m2
D. 1500 to 2000 litres/hour/m2
The settling velocity of a particle in a sedimentation tank increases if_________________?
A. particle size is decreased
B. the surface area of tank is increased
C. the depth of tank is decreased
D. none of the above
For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?
A. separate system
B. combined system
C. partially combined system
D. partially separate system
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
As compared to shallow-wells, deep wells have______________?
A. more depth
B. less depth
C. more discharge
D. less discharge
Sewerage system is designed for_______________?
A. maximum flow only
B. minimum flow only
C. average flow only
D. maximum and minimum flow
The suitable method of forecasting popu¬lation for a young and rapidly increasing city is_________________?
A. arithmetical increase method
B. geometrical increase method
C. incremental increase method
D. graphical method
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