Related Questions

The detention period for oxidation ponds is usually kept as
A 48 hours
B 24 hours
C 10 to 15 days
D 3 months
During sewage treatment, the sewage is subjected to __________ treatment in Imhoff tank.
A Filtration
B Digestion
C Sedimentation
D Both B and C
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
A Coagulation and flocculation of colloids
B Oxidation of carbonaceous matter to CO2
C Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate
D All of the above
Fine grit present in sewage is removed in the __________ during sewage treatment.
A Grit chamber
B Detritus tank
C Trickling filter
D Skimming tank
__________ substances present in sewage are removed in grit chamber during sewage treatment.
A Organic
B Fatty
C Inorganic
D Dissolved
In a sedimentation tank, the detention period for water ranges from __________ hours.
A 2 to 4
B 8 to 12
C 16 to 20
D 24 to 32
Biological oxidation ponds remove organic matters present in the polluted water by
A Using the activities of bacteria and other micro organisms
B Aerobic oxidation
C Both A & B
D Neither A nor B
Aerobic biological oxidation ponds used for the purification of polluted water
A Destroys/removes pathogen from the sewage
B Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents
C Destroys/removes pathogen much more effectively if the sewage is chlorinated
D All of the above
If a person can save TK.380 in 5 weeks, in how many weeks, at this same rate, can the person save 2.6 times amount ?
A 13
B 12.5
C 11
D 10.6
If Mr. Azad can save Tk. 380 in five weeks , in how many weeks m at this same rate, can he save 2.6 times of this amount?
A 13 weeks
B 12.5 weeks
C 11 weeks
D 8 weeks

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