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. The characteristics of fresh and septic sewage are:

a) alkaline and acidic

b) acidic and alkaline

c) acidic and acidic

d) alkaline and alkaline

2 / 30

2. Minimum depth of infiltration gallery is

a) 2 m

b) 3 m

c) 4 m

d) 5 m

3 / 30

3. Manhole is said to be medium if its depth is between:

a) 0.7-0.9 m

b) 0.9-1.2 m

c) 0.9-1.3 m

d) 0.9-1.5 m

4 / 30

4. The pattern of sanitation most suitable for a sloppy area is:

a) zone pattern

b) fan pattern

c) radial pattern

d) perpendicular pattern

5 / 30

5. In the partially ventilated single-stack system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

6 / 30

6. Shrouding is the process of filling gravel, bajri, etc., in

a) slotted tube well

b) strainer tube well

c) perforated tube well

d) cavity tube well

7 / 30

7. Groundwater is generally free from

a) suspended impurities

b) dissolved impurities

c) both (a) and (b) of the above

d) none of the above

8 / 30

8. Presence of algae in water indicates that the water is

a) hard

b) soft

c) acidic

d) pure

9 / 30

9. Sickness of tube well indicates

a) increase in well

b) reduction in yield

c) suffering from waterborne disease

d) all of the above

10 / 30

10. 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

11 / 30

11. Asbestos pipes are joined by means of

a) flanged joint

b) flexible joint

c) simplex joint

d) dresser coupling joint

12 / 30

12. Digesters are used for:

a) the sludge digestion under optimum conditions

b) the sludge digestion under normal conditions

c) the sludge digestion under extreme conditions

d) none of the above

13 / 30

13. 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

14 / 30

14. HGL should always be...... above the GL

a) 5 m

b) 10 m

c) 15 m

d) 20 m

15 / 30

15. Treatment of sewage of small estates and colonies is done by:

a) aerated lagoon

b) oxidation pond

c) oxidation ditch

d) all of the above

16 / 30

16. The clarigesters are:

a) circular septic tanks

b) circular imhoff double storage tanks without bottom hoppers

c) rectangular septic tanks

d) none of the above

17 / 30

17. In the one-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

18 / 30

18. Turbidity can be removed by

a) coagulation and filtration

b) aeration and sedimentation

c) activated carbon adsorption

d) disinfections

19 / 30

19. The pipe joint commonly used in a pumping station is

a) flexible joint

b) expansion joint

c) flanged joint

d) socket and spigot joint

20 / 30

20. After incubating a 2.5% solution of a sewage sample for 5 days at 20°C, the depletion of oxygen was found to be 5 PPM. The BOD of the sewage will be recorded as:

a) 5 PPM

b) 50 PPM

c) 100 PPM

d) 200 PPM

21 / 30

21. The commonly used material for water supply pipes having the property of not easily corroded, strong, long life but heavy and brittle is

a) steel

b) cast iron

c) wrought iron

d) RCC

22 / 30

22. Gastrointestinal irritation is produced because of excess of the following in water

a) chlorides

b) sulphates

c) nitrates

d) phosphates

23 / 30

23. 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

24 / 30

24. The valve provided at low points of the pipe to drain off water quickly under gravity is

a) drain valve

b) blow-off valve

c) sewer valve

d) all of the above

25 / 30

25. Scour valves are provided

a) at every summit of rising mains

b) at very depression and dead ends to drain out the waste water that may collect there

c) at street corners to control the flow of water

d) all of the above

26 / 30

26. The capacity of Guheswari STP is:

a) 15.4 Mld

b) 1.1 Mld

c) 0.50 Mld

d) 12.1 Mld

27 / 30

27. As compared to shallow tube wells, deep wells have

a) more depth

b) less depth

c) more discharge

d) less discharge

28 / 30

28. Which one is a waterborne virus infection?

a) malaria

b) cancer

c) dysentery

d) jaundice

29 / 30

29. Booster pump is used for

a) water supply

b) sewage pumping

c) pressure increase

d) drinking purposes

30 / 30

30. The coverage of water supply in Nepal as per the census of 2011 is

a) 90%

b) 75%

c) 85%

d) 70%

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