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 bacteria which require free oxygen for their survival are called:

a) aerobic bacteria

b) anaerobic bacteria

c) facultative bacteria

d) none of the above

2 / 30

2. 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

3 / 30

3. Normally the shape of the demand line is

a) straight

b) curved

c) both of the above

d) none of the above

4 / 30

4. The types of formwork provided for ferrocement tank in rural water supply schemes are

a) steel

b) wood

c) HDP pipe

d) all of the above

5 / 30

5. The pipe used to carry discharge from sanitary fittings like bathrooms, kitchens, etc., is:

a) waste pipe

b) soil pipe

c) vent pipe

d) anti-siphonage pipe

6 / 30

6. Turbidity is measured on..........

a) standard silica scale

b) standard cobalt scale

c) diagonal scale

d) none of the above

7 / 30

7. The detention time in a septic tank is usually:

a) 1-2 hours

b) 5-6 hours

c) 18-24 hours

d) 22-24 hours

8 / 30

8. The specific retention is least in the soil type

a) coarse gravel

b) sand

c) clay

d) silt

9 / 30

9. The slope of the hydraulic grade line is always towards the well due to pumping. This line of depressed water table is called

a) drawdown curve

b) circle of influence

c) dynamic gradient

d) an inverted cone of depression

10 / 30

10. A G.I. pipe has a coating of

a) zinc

b) lead

c) silver

d) aluminum

11 / 30

11. Baffle wall in septic tank is:

a) Short side wall

b) Long side wall

c) Honeycomb inner wall

d) None of the above

12 / 30

12. Time of concentration depends upon:

a) slope of the catchment

b) intensity of rainfall

c) nature of soil

d) all of the above

13 / 30

13. The highest non-scouring velocity in a sewer may be allowed in:

a) cast iron sewer

b) glazed brick sewer

c) cement concrete

d) stone ware sewer

14 / 30

14. The fire demand of a city is generally calculated by

a) underwriters formula

b) freeman formula

c) kuichling's formula

d) all of the above

15 / 30

15. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

16 / 30

16. A circular gravity aqueduct is preferred because of

a) its maximum hydraulic mean depth

b) maximum area per unit of wetted perimeter

c) minimum cost of construction

d) all of the above

17 / 30

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

a) more depth

b) less depth

c) more discharge

d) less discharge

18 / 30

18. The service pipes must be designed to carry

a) 3 times the average demand

b) 4 times the average demand

c) 1 times the average demand

d) 2 times the average demand

19 / 30

19. The factor for the selection of the pumping station site is

a) distance of the source of contamination or pollution

b) height above the H.F.L. of the river

c) future expansion

d) all of the above

20 / 30

20. Kidney damage may be caused due to excess concentration of

a) fluorides

b) nitrates

c) chlorides

d) nitrites

21 / 30

21. Service connections to consumer houses are generally provided with

a) copper pipes

b) PVC pipes

c) galvanized pipes

d) cast iron pipes

22 / 30

22. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

23 / 30

23. If Q is discharge in cubic meters per second and D is the economical diameter of the pipe, then according to Lea

a) D = 0.67 to 0.87 √Q

b) D = 0.67 to 0.97 √Q

c) D = 0.97 to 1.22 √Q

d) D = 1.22 to 1.32 √Q

24 / 30

24. The hourly variation factor is generally taken

a) 1.2

b) 1.5

c) 1.8

d) 2.3

25 / 30

25. Advantage of pressure conduits is

a) flow is independent of the grade of the hydraulic grade line

b) economical since it follows a shorter path

c) less chance of water pollution as it is closed

d) all of the above

26 / 30

26. Sewerage system is designed for:

a) maximum flow only

b) minimum flow only

c) average flow only

d) maximum and minimum flow

27 / 30

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

a) zone pattern

b) fan pattern

c) radial pattern

d) perpendicular pattern

28 / 30

28. 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

29 / 30

29. Highly colored waters are

a) unaesthetic

b) highly polluted

c) require elaborate

d) rich in iron and manganese.

30 / 30

30. The term "septic" refers to.....?

a) Anaerobic bacterial environment that develops in the tank

b) Refers to safety and precaution

c) Drainage of waste materials

d) Aerobic bacterial environment that develops in the tank

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