Chlorination of water is done for the removal of____________________?

Related Mcqs:

1. Primary treatment of sewage consists of removal of__________________?

   A. Large suspended organic solids
   B. Oil and grease
   C. Sand and girt
   D. Floating materials

2. Removal of oil and grease from sewage, is known____________________?

   A. Screening
   B. Skimming
   C. Filtration
   D. None of these

3. Surface tension has the units of____________________?

   A. newtons/m
   B. newtons/m
   C. new tons/m
   D. newtons
   E. newton m

4. Rain drops are spherical because of____________________?

   A. viscosity
   B. air resistance
   C. surface tension forces
   D. atmospheric pressure
   E. none of the above

5. Bernoulli equation deals with the law of conservation of____________________?

   A. mass
   B. momentum
   C. energy
   D. work
   E. force

6. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?

   A. 0.05552 cumec
   B. 0.05554 cumec
   C. 0.05556 cumec
   D. 0.0556 cumec

7. As compared to fresh river water, sea water contains oxygen_________________?

   A. 10% less
   B. 20% less
   C. 10% more
   D. 20% more

8. weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?

   A. w r S S
   B. w r1/2
   C. w r S
   D. w r2/3

9. In septic tanks, decomposition of organic bacteria, is done by_____________________?

   A. Anaerobic bacteria
   B. Aerobic bacteria
   C. Both types of bacterias
   D. None of these

10. The laying of sewers is done with____________________?

    A. Magnetic compass
    B. Theodolite
    C. Level
    D. Clinometer