Water Supply & Sanitation Engineering Online Test

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Vikash chaudhary

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Total Questions: 30
Time Allotted: 30 minutes
Passing Score: 50%
Randomization: Yes
Certificate: No
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1 / 30

1. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

2 / 30

2. Salvaging is:

a) extraction of essence from waste

b) dumping of solid waste

c) sanitary land filling of solid waste

d) none of the above

3 / 30

3. Harmful bacteria are called:

a) Parasites

b) Anaerobic bacteria

c) Aerobic bacteria

d) Pathogens

4 / 30

4. The types of pipe which are generally laid vertically due to low strength is

a) copper

b) concrete

c) asbestos cement

d) cast iron

5 / 30

5. In the two-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

6 / 30

6. The disinfection efficiency of chlorination

a) increases with the temperature of water

b) decreases with the temperature of water

c) not affected by temperature

d) none of the above

7 / 30

7. The design discharge for the combined system shall be taken equal to:

a) rainfall

b) rainfall + dry weather flow

c) rainfall + 2× dry weather flow

d) rainfall + 4× dry weather flow

8 / 30

8. As per Buston's formula, fire demand for in liters per minute for a population of p in thousands, is given by

a) 5663 √p

b) 3182 √p

c) 4640 √p

d) none of the above

9 / 30

9. The standard BOD at 20°C is taken for the consumption in:

a) 20 days

b) 15 days

c) 10 days

d) 5 days

10 / 30

10. The water which is not chemically pure but does not contain anything harmful to human health is known as

a) pure water

b) wholesome water

c) polluted water

d) none of the water

11 / 30

11. Depth of shallow tube well shall not be more than (considering economic point):

a) 30 m

b) 40 m

c) 50 m

d) 60 m

12 / 30

12. Turbidity can be removed by

a) coagulation and filtration

b) aeration and sedimentation

c) activated carbon adsorption

d) disinfections

13 / 30

13. Absolutely soft waters are required for

a) drinking

b) boilers

c) prevention of corrosion in pipes

d) washing with synthetic detergent soap

14 / 30

14. The depression of the water table in a well due to pumping will be maximum

a) at a distance r from the well

b) at a distance r/2 from the well

c) close to the well

d) none of the above

15 / 30

15. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

16 / 30

16. The characteristics of fresh and septic sewage are:

a) alkaline and acidic

b) acidic and alkaline

c) acidic and acidic

d) alkaline and alkaline

17 / 30

17. The capacity of a flushing cistern for water closets is:

a) 1-2 liters

b) 10-15 liters

c) 5 liters

d) 20-25 liters

18 / 30

18. The sewage consists of water:

a) 80%

b) 90%

c) 95%

d) 99.9%

19 / 30

19. If 10 ml of raw sewage is diluted to 250 ml, and the dissolved oxygen content of the diluted sample changes from 9 mg/l to 5 mg/l after incubation at 20°C. for 5 days, BODs of raw sewage is:

a) 0.16 mg/l

b) 4 mg/l

c) 10 mg/l

d) 100 mg/l

20 / 30

20. A complete water supply system includes:

a) construction of intake and collection chamber

b) digging of a well for water

c) construction of a dam for a reservoir

d) the entire arrangement from source to distribution

21 / 30

21. As compared to cast iron pipes, steel pipes are

a) stronger

b) heavier

c) costlier

d) all of the above

22 / 30

22. PH value of water for water supply

a) 6.5 to 8.5

b) 5.5 to 7.0

c) 7.0 to 9.5

d) 5.5 to 9.5

23 / 30

23. The asbestos cement pipes are generally laid

a) horizontally

b) vertically

c) in any position

d) inclined at 60°

24 / 30

24. In a circular sewer if depth of flow is 0.2 times the full depth, the nominal gradient:

a) is only provided

b) is doubled

c) three

d) none of the above

25 / 30

25. The working conditions in imhoff tanks are:

a) aerobic only

b) anaerobic only

c) aerobic in the lower and anaerobic in the upper compartment

d) anaerobic in the lower and aerobic in the upper compartment

26 / 30

26. The process of obtaining energy for their (bacteria) synthesis after the oxidation of organic or inorganic matter is called

a) photosynthesis

b) chemosynthesis

c) both

d) none

27 / 30

27. Impetus valve/waste valve is provided in

a) hydraulic ram

b) centrifugal pump

c) rotary pump

d) all of the above

28 / 30

28. Poppet valve is a type of

a) air valve

b) blow-off valve

c) sluice valve

d) none of the above

29 / 30

29. Sterilization is the process of

a) killing of diseases bacteria

b) produce of diseases of water

c) no change diseases bacteria

d) eliminating all life

30 / 30

30. A circular section for a sewer is preferred only up to a diameter of:

a) 10 cm

b) 20 cm

c) 30 cm

d) 60 cm

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