Fresh domestic sewage is _______________ in color?

Related Mcqs:

1. Fresh sewage is ______________ in nature?

   A. Acidic
   B. Neutral
   C. Alkaline
   D. Highly acidic

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

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

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

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

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

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

5. Color test of water is done with an instrument called__________________?

   A. Tintometer
   B. Colorimeter
   C. Electro-chemical cell
   D. Turbidimeter

6. Presence of dissolved impurities of ______________ is responsible for the red brownish color of water?

   A. Carbonates
   B. Bi-carbonates
   C. Iron & manganese
   D. Arsenic

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

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

8. Which of the following processes is involved in the biochemical treatment of sewage effluents ?

   A. Oxidation
   B. Reduction
   C. Dehydration
   D. Fermentation

9. 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

10. BOD of raw municipal sewage may be in the range of about _____________ mg/litre?

    A. 1-2
    B. 5-10
    C. 150-300
    D. 2000-3000