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. Sickness of tube well indicates

a) increase in well

b) reduction in yield

c) suffering from waterborne disease

d) all of the above

2 / 30

2. Poppet valve is a type of

a) air valve

b) blow-off valve

c) sluice valve

d) none of the above

3 / 30

3. An aquiclude is

a) a non-artesian aquifer

b) a large underground water body

c) a confined bed of impervious material between aquifers

d) an artesian aquifer

4 / 30

4. Rotary pumps are suited for

a) small discharge

b) large discharge

c) high head

d) none of the above

5 / 30

5. 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

6 / 30

6. 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

7 / 30

7. 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

8 / 30

8. The type of joint used in joining the plain ends of cast-iron pipes is

a) flanged joint

b) flexible joint

c) dresser coupling joint

d) socket and spigot joint

9 / 30

9. The aquifer having the least water-bearing capacity is

a) confined

b) unconfined

c) perched

d) none of the above

10 / 30

10. "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

11 / 30

11. 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

12 / 30

12. 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

13 / 30

13. Gravity conduits are generally in the form of

a) open channels

b) conduits

c) tunnels

d) all of the above

14 / 30

14. The per capita consumption of a locality will be more when

a) good-quality water is supplied

b) during summer months

c) distribution pressure is increased

d) all of the above

15 / 30

15. Nahni trap is made of:

a) mud

b) cast iron

c) steel

d) all of the above

16 / 30

16. Garbage dumping home is:

a) places where garbage is kept

b) places where garbage is disposed

c) places where garbage is treated

d) all of the above

17 / 30

17. The sewage in an inverted siphon will flow under what condition?

a) Air

b) Vacuum

c) Pressure

d) Gravity

18 / 30

18. Gravity water supply system starts from

a) intake

b) collection chamber

c) BPT

d) faucet

19 / 30

19. Septic tank effluent is:

a) quite clear and sparkling

b) always odorless

c) having fine organic solids with high BOD

d) black tarry liquor with an earthy odor

20 / 30

20. The sewer pipes:

a) carry sewage as gravity conduits

b) should resist the wear and tear caused due to abrasion

c) are designed for generating self-cleaning velocities at different discharge

d) all of the above

21 / 30

21. Grit obtained in a grit chamber is used for:

a) as a manure

b) as a soil conditioner

c) as a coarse aggregate

d) as a substitute for sand

22 / 30

22. The open channels supported above the ground over trestles are called

a) tunnel

b) aqueduct

c) flume

d) conduit

23 / 30

23. 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

24 / 30

24. Sewerage system is designed for:

a) maximum flow only

b) minimum flow only

c) average flow only

d) maximum and minimum flow

25 / 30

25. Decrease in per capita consumption occurs by

a) use of a metering system

b) hot climate

c) good-quality water is supplied

d) all of the above

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. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

28 / 30

28. 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

29 / 30

29. Break pressure tank is generally provided in rural water supply schemes if static head exceeds

a) 30 m

b) 40 m

c) 50 m

d) 60 m

30 / 30

30. Manholes on sewer lines are provided for:

a) periodic cleaning

b) providing air for oxidation

c) removal of part of sewerage

d) all of the above

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