Disinfection of water results in______________?

Related Mcqs:

1. The suitable method for disinfection of swimming pool water is________________?

   A. ultra violet rays treatment
   B. lime treatment
   C. by using potassium permanganate
   D. chlorination

2. 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

3. 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)

4. The maximum efficiency of BOD removal is achieved in______________?

   A. oxidation pond
   B. oxidation ditch
   C. aerated lagoons
   D. trickling filters

5. 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

6. The maximum permissible limit for flouride in drinking water is______________?

   A. 0.1 mg/litre
   B. 1.5 mg/litre
   C. 5 mg/litre
   D. 10 mg/litre

7. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?

   A. 10 to 25
   B. 50
   C. 75
   D. 100

8. The water carriage system of collection of waste product________________?

   A. is cheaper in initial cost than dry conservancy system
   B. requires treatment before disposal
   C. creates hygenic problem
   D. all of the above

9. The amount of coagulant needed for coagulation of water increases with_______________?

   1) increase in turbidity of water
   2) decrease in turbidity of water
   3) increase in temperature of water
   4) decrease in temperature of water
   The correct answer is?

   A. (1) and (2)
   B. (1)and (4)
   C. (2) and (3)
   D. (2) and (4)

10. Ground water is usually free from________________?

    A. suspended impurities
    B. dissolved impurities
    C. both suspended and dissolved impuri¬ties
    D. none of the above