Fresh sewage is ______________ in nature?

Related Mcqs:

1. During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank?

   A. Filtration
   B. Digestion
   C. Sedimentation
   D. Both B. and C.

2. Fresh domestic sewage is _______________ in color?

   A. Grey
   B. Dark brown
   C. Red
   D. Black

3. Fine grit present in sewage is removed in the _____________ during sewage treatment?

   A. Grit chamber
   B. Detritus tank
   C. Trickling filter
   D. Skimming tank

4. ____________ substances present in sewage are removed in grit chamber during sewage treatment?

   A. Organic
   B. Fatty
   C. Inorganic
   D. Dissolved

5. A shallow pond in which the sewage is retained and biologically treated is called__________________?

   A. Oxidation
   B. Imhoff tank
   C. Lagoon
   D. Skimming tank

6. 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

7. The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?

   A. CO2
   B. CH4
   C. CO
   D. H2

8. 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

9. In sewage treatment, its sedimentation is speeded up by commonly adding__________________?

   A. Hydrochloric acid
   B. Lime
   C. Copper sulphate
   D. Sodium sulphate

10. 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