The most common cause of acidity in water is_______________?

Related Mcqs:

1. The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is_______________?

   A. check valve
   B. sluice valve
   C. safety valve
   D. scour valve

2. Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to the coding system given below?

   A. Both A and R are true and R is the correct explanation of A
   B. Both A and R are true but R is not the correct explanation of A
   C. A is true but R is false
   D. A is false but R is true

3. A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called________________?

   A. house sewer
   B. lateral sewer
   C. main sewer
   D. submain sewer

4. The effective size of sand particles used in slow sand filters is_______________?

   A. 0.25 to 0.35 mm
   B. 0.35 to 0.60 mm
   C. 0.60 to 1.00 mm
   D. 1.00 to 1.80 mm

5. The suitable layout of a distribution system for irregularly growing town is_______________?

   A. dead end system
   B. grid iron system
   C. radial system
   D. ring system

6. When there is no recirculation of sewage, then recirculation factor is_______________?

   A. 0
   B. 1
   C. infinity
   D. none of the above

7. The most commonly used sewer under culverts is_______________?

   A. circular brick sewer
   B. circular cast iron sewer
   C. semi-elliptical sewer
   D. horse-shoe type sewer

8. The hydraulic mean depth (HMD. for an egg-shaped sewer flowing two-third full is_______________?

   A. equal to HMD when flowing full
   B. less than HMD when flowing full
   C. greater than HMD when flowing full
   D. none of the above

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 chemical most commonly used to increase speed of sedimentation of sewage is_______________?

    A. sulphuric acid
    B. copper sulphate
    C. lime
    D. sodium permanganate