1. The yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?
A. 10 times
B. 15 times
C. 20 times
D. 30 times
✅ The correct answer is option D.
Water Supply Engineering MCQs
2. For determining the velocity of flow of underground water, the most commonly used non-empirical formula is________________?
A. Darcy’s formula
B. Slichter’s formula
C. Hazen’s formula
D. Lacy’s formula
✅ The correct answer is option A.
3. Surge tanks are used_______________?
A. for storage water
B. to increase the velocity in a pipeline
C. as overflow valves
D. to guard against water hammer
✅ The correct answer is option D.
4. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
A. nil
B. 5
C. 10
D. 15
✅ The correct answer is option A.
5. Aeration of water is done to remove______________?
A. odour
B. colour
C. bacterias
D. hardness
✅ The correct answer is option A.
6. In distribution pipes, drain valves are provided at_______________?
A. lower point
B. higher point
C. junction points
D. any where
✅ The correct answer is option A.
7. In slow sland filters, the turbidity of raw water can be removed only up to_________________?
A. 60 mg/litre
B. 75 mg/litre
C. 100 gm/litre
D. 150 mg/litre
✅ The correct answer is option A.
8. Disinfection of drinking water, is done to remove_________________?
A. odour
B. bacterias
C. turbidity
D. colour
✅ The correct answer is option B.
9. Sunlight_________________ ?
A. helps growth of bacterias
B. impedes growth of algae
C. increases dissolved oxygen content
D. reduces turbidity
✅ The correct answer is option B.
10. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is______________________?
A. 1880 kilo litres
B. 2880 kilo litres
C. 3880 kilo litres
D. 4880 kilo litres
✅ The correct answer is option B.