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 presence of hydrogen sulfide in water causes:

a) softening

b) acidity

c) alkalinity

d) bad taste

2 / 30

2. Detention time for the detritus tank is:

a) 1-2 minutes

b) 2-3 minutes

c) 3-4 minutes

d) 4-5 minutes

3 / 30

3. Septic tanks are best suited for:

a) municipalities

b) industries

c) scattered residences

d) congested areas

4 / 30

4. A manhole is generally provided at each:

a) bend

b) junction

c) change of gradient

d) change of sewer diameter

5 / 30

5. A sewer, which receives the discharge of a number of house sewers, is called:

a) house sewer

b) lateral sewer

c) intercepting sewer

d) sub-main sewer

6 / 30

6. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

7 / 30

7. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

8 / 30

8. A manhole of such depth that an access shaft is required in addition to the working chamber, is called.....:

a) shallow manhole

b) medium manhole

c) deep manhole

d) none of the above

9 / 30

9. Asbestos pipes are joined by means of

a) flanged joint

b) flexible joint

c) simplex joint

d) dresser coupling joint

10 / 30

10. If the head of water is more than 100 m then the type of pipe used is

a) plastic

b) HDP

c) GI

d) PVC

11 / 30

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

a) confined

b) unconfined

c) perched

d) none of the above

12 / 30

12. Turbidity depends on the presence of the following in water

a) suspended solids

b) suspended solids and colloidal solids

c) any material capable of preventing light

d) intensity of coloration

13 / 30

13. If you have to design a simple water filtration unit for a community water supply system in Biratnagar, which type of filter will you choose in general?

a) slow sand filter

b) rapid sand filter

c) trickling filter

d) pressure filter

14 / 30

14. In strainer type wells

a) the flow is radial

b) the flow is spherical

c) area of flow depends upon the size of the cavity

d) all of the above

15 / 30

15. Methemoglobinemia (Blue babies) is due to

a) oxidation of hemoglobin

b) nitrates replacing oxygen in hemoglobin

c) nitrites replacing oxygen in hemoglobin

d) carbon monoxide replacing oxygen in hemoglobin

16 / 30

16. Water demand for public use as compared to the total demand, kept in the design of waterworks for a city, is

a) 5%

b) 10%

c) 20%

d) 25%

17 / 30

17. Suitable sewer section for both combined and separate systems is:

a) circular section

b) rectangular section

c) egg-shaped section

d) horse-shoe type section

18 / 30

18. Turbidity of water is measured in

a) mg/1

b) Nephelometric Turbidity Unit (NTU)

c) potassium chloroplatinate units

d) threshold number

19 / 30

19. Nahni trap is made of:

a) mud

b) cast iron

c) steel

d) all of the above

20 / 30

20. Inspection arm is provided in:

a) manhole

b) drop manhole

c) lamp hole

d) clean out

21 / 30

21. The valve which allows water to flow in one direction but prevents its flow in the reverse direction is

a) reflux valve

b) gate valve

c) sluice valve

d) pressure valve

22 / 30

22. 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

23 / 30

23. True colour of water is due to

a) suspended solids

b) colloidal solids

c) volatile solids

d) acids in solution

24 / 30

24. In the two-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

25 / 30

25. Find the BOD with the following data: initial oxygen = 9 PPM, final oxygen = 4 PPM sewage sample 200 ml and diluted sewage = 4 ppm.

a) 180 PPM

b) 320 PPM

c) 200 PPM

d) 250 PPM

26 / 30

26. Water to the consumers may be supplied from

a) rainy wells sunk to the water level

b) infiltration well dug out on the banks of rivers

c) infiltration galleries connected to a sump well

d) all of the above

27 / 30

27. 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

28 / 30

28. A flight sewer is provided when the gradient is:

a) low

b) steep

c) maximum (i.e., vertical)

d) zero

29 / 30

29. Iron and manganese are estimated by

a) jar test

b) winkler test

c) calorimetric test

d) none of the above

30 / 30

30. Choose the odd statement:

a) sewage is received in a wet well

b) sewage is received in a dry well

c) both of the above

d) none of the above

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