Residual chlorine in water is determined by________________?

Related Mcqs:

1. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?

   A. 0.01 to 0.05 ppm
   B. 0.05 to 0.5 ppm
   C. 0.5 to 1.0 ppm
   D. 1.0 to 5.0 ppm

2. Chlorine demand of water is equal to________________?

   A. applied chlorine
   B. residual chlorine
   C. sum of applied and residual chlorine
   D. difference of applied and residual chlorine

3. The percentage of chlorine in fresh bleaching powder is about________________?

   A. 10 to 15
   B. 20 to 25
   C. 30 to 35
   D. 40 to 50

4. 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)

5. 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

6. Cleaning is done by________________?

   1) scraping and removal in filters slow sand
   2) back washing in slow sand filters
   3) scraping and removal in filters rapid sand
   4) back washing in rapid sand filters
   The correct answer is

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

7. 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

8. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?

   A. total alkalinity
   B. total hardness
   C. total hardness – total alkalinity
   D. non carbonate hardness

9. Average rate of water consumption perhead per day as per Indian Standard is______________?

   A. 100 litres
   B. 135 litres
   C. 165 litres
   D. 200 litres

10. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is____________________?

    A. reflux valve
    B. sluice valve
    C. air relief valve
    D. pressure relief valve