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. Sanitary sewage means:

a) domestic sewage

b) industrial sewage

c) both (a) and (b) above

d) none of the above

2 / 30

2. Slow sand filter is efficient to remove bacteria from the raw water to an extent of:

a) 50%

b) 70%

c) 85%

d) 99%

3 / 30

3. Which test is a must for a house sewer?

a) water test

b) air test

c) compaction test

d) smoke test

4 / 30

4. The types of joint not used to resist shock, vibration, etc. is

a) dresser coupling joint

b) victaulic joint

c) flanged joint

d) flexible joint

5 / 30

5. Baffle wall in septic tank is:

a) Short side wall

b) Long side wall

c) Honeycomb inner wall

d) None of the above

6 / 30

6. Merit of water carriage sewage system:

a) no human agency is involved in this system

b) no problem of foul smell or hygienic trouble

c) less area is required

d) all of the above

7 / 30

7. Clean out is provided in the underground......sewer in place of manhole.

a) main sewer

b) trunk sewer

c) outfall sewer

d) lateral sewer

8 / 30

8. The object of cowl is to:

a) give an ornamental look

b) prevent the entry of rainfall into the waste pipe

c) quickly dispel foul gases

d) prevent nest building

9 / 30

9. Sluice valves in main water supplies are

a) used to regulate the flow

b) spaced about 5 km apart

c) generally provided at the summits

d) all of the above

10 / 30

10. Detention time for the detritus tank is:

a) 1-2 minutes

b) 2-3 minutes

c) 3-4 minutes

d) 4-5 minutes

11 / 30

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

a) 20 days

b) 15 days

c) 10 days

d) 5 days

12 / 30

12. "A right-angled sleeve (valve) connected in the water main through which water is tapped for domestic supply is called:

a) service pipe

b) goose neck

c) ferrule

d) stop tap

13 / 30

13. The types of sewer suitable for a separate system where discharge is uniform are:

a) egg-shaped

b) horse-shoe

c) circular

d) elliptical

14 / 30

14. The valve provided on the suction pipe in a tube-well is

a) air relief valve

b) reflux valve

c) pressure

d) sluice valve

15 / 30

15. The design discharge for the separate sewer system is taken equal to:

a) dry weather flow

b) 2x dry weather flow

c) 4x dry weather flow

d) 6x dry weather flow

16 / 30

16. If 10 ml of raw sewage is diluted to 250 ml, the dilution factor is:

a) 24

b) 25

c) 1/25

d) none of the above

17 / 30

17. Thrash rack/roughing filter is provided at the entrance of

a) intake

b) slow sand filter

c) rapid sand filter

d) all of the above

18 / 30

18. By boiling water, hardness can be removed if it is due to:

a) Calcium sulphate

b) Magnesium sulphate

c) Calcium nitrate

d) Calcium bicarbonate

19 / 30

19. Turbidity for domestic water is undesirable because it

a) is unaesthetic

b) causes change of taste

c) gives apparent colour

d) none of the above

20 / 30

20. Drop manholes are provided on sewers in:

a) hilly towns

b) plain towns

c) manholes are deep

d) none of the above

21 / 30

21. 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

22 / 30

22. Inspection arm is provided in:

a) manhole

b) drop manhole

c) lamp hole

d) clean out

23 / 30

23. Per capita water demand is calculated in liters

a) per person per day

b) per person per month

c) per person per year

d) none of the above

24 / 30

24. The ratio of maximum hourly consumption and average hourly consumption of the maximum day is

a) 1.2

b) 1.5

c) 1.8

d) 2.7

25 / 30

25. The pressure at the inlet and outlet in a break pressure tank is

a) zero and 1 m

b) 1 m and zero

c) zero and zero

d) 1 m and 1 m

26 / 30

26. In the above problem 151, using Manning's formula with n = 0.014 then the hydraulic gradient will be

a) 1:200

b) 1:400

c) 1:800

d) 1:1000

27 / 30

27. 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

28 / 30

28. When the limiting non-scouring velocity is 5 m/sec, the type of sewer generally used is:

a) stone ware sewer

b) cast iron sewer

c) brick sewer

d) glazed brick sewer

29 / 30

29. Factors considered in the selection of the site for the intake point are that it should be

a) nearer to the treatment plant

b) in the pure zone of the water source

c) upstream of the point of disposal of wastewater

d) all of the above

30 / 30

30. For an insignificant effect on the water table, the tube wells are spaced as one in every

a) 0.5 sq km

b) 1.0 sq km

c) 1.5 sq km

d) 2.0 sq km

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