A. Acidic
B. Neutral
C. Alkaline
D. Highly acidic
Related Mcqs:
- During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank?
A. Filtration
B. Digestion
C. Sedimentation
D. Both B. and C. - Fresh domestic sewage is _______________ in color?
A. Grey
B. Dark brown
C. Red
D. Black - 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 - A shallow pond in which the sewage is retained and biologically treated is called__________________?
A. Oxidation
B. Imhoff tank
C. Lagoon
D. Skimming tank - The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
A. Bacterial stability factor
B. Relative stability
C. Biological oxygen demand (BOD)
D. Oxygen ion concentration - The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?
A. CO2
B. CH4
C. CO
D. H2 - In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?
A. 1 to 2
B. 4 to 5
C. 9 to 10
D. 15 to 20 - In sewage treatment, its sedimentation is speeded up by commonly adding__________________?
A. Hydrochloric acid
B. Lime
C. Copper sulphate
D. Sodium sulphate - The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?
A. Anaerobic
B. Saprophytic
C. Aerobic
D. Parasitic
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