Cleaning is done by________________?

Related Mcqs:

1. The means of access for inspection and cleaning of sewer line is known as_______________?

   A. inlet
   B. manhole
   C. drop manhole
   D. catch basin

2. Period of cleaning of slow sand filters is about________________?

   A. 24 – 48 hours
   B. 10-12 days
   C. 2-3 months
   D. 1-2 year

3. Residual chlorine in water is determined by________________?

   A. starch iodide method
   B. orthotolidine method
   C. both (A) and (B)
   D. none of the above

4. In facultative stabilization pond, the sewage is treated by________________?

   A. aerobic bacteria only
   B. algae only
   C. dual action of aerobic bacteria and anaerobic bacteria
   D. sedimentation

5. Laying of sewers is usually done with the help of________________?

   A. a theodolite
   B. a compass
   C. sight rails and boning rods
   D. a plane table

6. The process in which the chlorination is done beyond the break point is known as_________________?

   A. prechlorination
   B. post chlorination
   C. super chlorination
   D. break point chlorination

7. The hourly variation factor is usually taken as______________?

   A. 1.5
   B. 1.8
   C. 2.0
   D. 2.7

8. For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as___________________?

   A. 4.5 to 6.0
   B. 6.5 to 8.0
   C. 8.5 to 10.0
   D. 10.5 to 12.0

9. The specific gravity of sewage is_______________?

   A. much greater than 1
   B. slightly less than 1
   C. equal to 1
   D. slightly greater than 1

10. The velocity of flow of water in a sedimentation tank is about__________________?

    A. 5 to 10 cm/sec.
    B. 15 to 30 cm/sec.
    C. 15 to 30 cm/minute
    D. 15 to 30 cm/hour