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. Which metal is good for keeping drinking water?

a) copper

b) brass

c) zinc

d) iron

2 / 30

2. Time of concentration depends upon:

a) slope of the catchment

b) intensity of rainfall

c) nature of soil

d) all of the above

3 / 30

3. 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

4 / 30

4. Inverted siphon is called:

a) special sewer

b) general sewer

c) storm sewer

d) none of the above

5 / 30

5. Detention time for the detritus tank is:

a) 1-2 minutes

b) 2-3 minutes

c) 3-4 minutes

d) 4-5 minutes

6 / 30

6. Sanitary sewage means:

a) domestic sewage

b) industrial sewage

c) both (a) and (b) above

d) none of the above

7 / 30

7. Sickness of tube well indicates

a) increase in well

b) reduction in yield

c) suffering from waterborne disease

d) all of the above

8 / 30

8. In the single-stack system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

9 / 30

9. Drop manholes are provided on sewers in:

a) hilly towns

b) plain towns

c) manholes are deep

d) none of the above

10 / 30

10. The type of joint used in HDP pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

11 / 30

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

a) Air

b) Vacuum

c) Pressure

d) Gravity

12 / 30

12. 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

13 / 30

13. Most commonly used section in the grade aqueduct is

a) circular

b) rectangular

c) parabolic

d) all of the above

14 / 30

14. Highly colored waters are

a) unaesthetic

b) highly polluted

c) require elaborate

d) rich in iron and manganese.

15 / 30

15. Alum increases

a) hardness of water

b) carbonate of water

c) sulphate of water

d) acidity of water

16 / 30

16. Where it is not possible to obtain self-cleansing velocities for sewers, flush are provided with the minimum available head of:

a) 1-3 m

b) 3-5 m

c) 5-7 m

d) 7-10 m

17 / 30

17. Strainer type tube wells are considered unsuitable for

a) coarse gravel

b) fine sand strata

c) clean gravels

d) all of the above

18 / 30

18. The working chamber of a manhole, along the direction of flow should have a minimum length for depth more than 0.8m:

a) 0.6 m

b) 0.9 m

c) 1.2 m

d) 2.4 m

19 / 30

19. 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

20 / 30

20. A septic tank is a watertight tank where the following operation(s) take place:

a) sedimentation

b) sedimentation + digestion (anaerobic)

c) digestion (aerobic)

d) decomposition of organic and inorganic matter by bacteria

21 / 30

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

a) tunnel

b) aqueduct

c) flume

d) conduit

22 / 30

22. Any trap is intended to trap foul gases with the provision of:

a) clear seal

b) sewage or sullage

c) otta seal

d) water seal

23 / 30

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

a) 50%

b) 70%

c) 85%

d) 99%

24 / 30

24. Pressure relief valve is provided in the water main

a) to reduce the pressure

b) upstream of the sluice

c) at the low point

d) all of the above

25 / 30

25. Goitre is due to

a) chlorine

b) bromine

c) iodine

d) all of the above

26 / 30

26. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is:

a) 95.95%

b) 96.05%

c) 96.86%

d) 100%

27 / 30

27. Excess concentration of magnesium salts in water causes

a) hardness

b) bitter taste

c) alkalinity

d) laxative effect

28 / 30

28. Selection of material for the pipe depends on

a) carrying capacity of the pipe

b) durability and life of the pipe

c) effect of water to be conveyed on the pipe material

d) all of the above

29 / 30

29. A heavy metal having non-toxic property

a) lead

b) copper

c) zinc

d) silver

30 / 30

30. Odour is measured in terms of...

a) threshold number

b) reynold number

c) mach number

d) none of the above

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