As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________?

Related Mcqs:

1. In chlorination, with the rise in temperature of water, death rate of bacteria____________?

   A. increases
   B. decreases
   C. remains unaffected
   D. none of the above

2. 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

3. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?

   A. less and more
   B. less and less
   C. more and less
   D. more and more

4. Which of the following values of pH represents a stronger acid?

   A. 2
   B. 5
   C. 7
   D. 10

5. Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters. Reason R : The sand used in slow sand filters is finer than that in rapid sand filters. Select your answer based on 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. 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

7. The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?

   A. 1
   B. 100
   C. infinite
   D. zero

8. As compared to shallow-wells, deep wells have______________?

   A. more depth
   B. less depth
   C. more discharge
   D. less discharge

9. As compared to cast iron pipes, steel pipes are______________?

   A. heavier
   B. stronger
   C. costlier
   D. less susceptible to corrosion

10. As compared to rapid sand filters, slow sand filters give______________?

    1) slower filtration rate
    2) higher filtration rate
    3) lesser efficiency in removal of bacteria
    4) higher efficiency in removal of bacteria
    The correct answer is?

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