The treatment of water with bleaching powder is known as________________?

Related Mcqs:

1. 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

2. In water treatment, rapid gravity filters are adopted to remove_______________?

   A. dissolved organic substances
   B. dissolved solids and dissolved gases
   C. floating solids and dissolved inorganic solids
   D. bacteria and colloidal solids

3. 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

4. Sewage treatment units are normally designed for______________?

   A. 5-10 years
   B. 15-20 years
   C. 30-40 years
   D. 40-50 years

5. Sewage treatment units are designed for_______________?

   A. maximum flow only
   B. minimum flow only
   C. average flow only
   D. maximum and minimum flow

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 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

8. Which of the following chemical compounds can be used for dechlorination of water ?

   A. carbon dioxide
   B. bleaching powder
   C. sulphur dioxide
   D. chloramines

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. 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