The pathogens can be killed by_______________?

Related Mcqs:

1. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?

   A. TOD>BOD>COD
   B. TOD>COD>BOD
   C. BOD>COD>TOD
   D. COD>BOD>TOD

2. The disinfection efficiency of chlorine increases by_______________?

   1) decreasing the time of contact
   2) decreasing the temperature of water
   3) increasing the temperature of water
   The correct answer is ?
   A. only (1)
   B. both (1) and (2)
   C. both (1) and (3)
   D. only (3)

3. The settling velocity of a particle in a sedimentation tank increases if______________?

   A. particle size is decreased
   B. the surface area of tank is increased
   C. the depth of tank is decreased
   D. none of the above

4. Disinfection efficiency is________________?

   A. reduced at higher pH value of water
   B. unaffected by pH value of water
   C. increased at higher pH value of water
   D. highest at pH value equal to 7

5. The type of sewer which is suitable for both combined and separate system is_____________?

   A. circular sewer
   B. egg shaped sewer
   C. horse-shoe type sewer
   D. semi-elliptical sewer

6. 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

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

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

8. The design discharge for the combined sewer system shall be taken as________________?

   A. equal to rainfall
   B. rainfall + DWF
   C. rainfall + 2 DWF
   D. rainfall + 6 DWF

9. The settling velocity of a particle in a sedimentation tank depends on__________________?

   A. depth of tank
   B. surface area of tank
   C. both depth and surface area of tank
   D. none of the above

10. The per capital consumption of a locality is affected by_________________?

    1) climatic conditions
    2) quality of water
    3) distribution pressure
    The correct answer is?

    A. only (1)
    B. both (1) and (2)
    C. both (1) and (3)
    D. all (1), (2) and (3)