Water Supply & Sanitation Engineering Online Test – Paper 2

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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 quantity of flushing water required for pour-flush water seal latrine is:

a) 0.5-1.5 litres

b) 1.5-2.0 litres

c) 2.0-3.0 litres

d) 3.0-4.0 litres

2 / 30

2. The water carriage sewage system:

a) is cheaper in initial cost than dry conveyance system

b) requires treatment before disposal

c) creates a hygienic problem

d) all of the above

3 / 30

3. The sewage consists of water:

a) 80%

b) 90%

c) 95%

d) 99.9%

4 / 30

4. 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

5 / 30

5. The approximate diameter of a water mains for supplying 7.15 mld with 1.21 m/sec velocity flow will be

a) 10 cm

b) 20 cm

c) 30 cm

d) 50 cm

6 / 30

6. The ratio of maximum to average sewage flow for mains up to 1 m in diameter is usually:

a) 1.0

b) 1.2

c) 1.5

d) 2.0

7 / 30

7. Before entering a manhole, a candle is lowered into the manhole:

a) to illuminate it

b) to detect toxic gases

c) to give a signal to the adjacent manhole

d) to find out the presence of oxygen

8 / 30

8. The most dangerous metal for human health is

a) zinc

b) copper

c) lead

d) iron

9 / 30

9. 2 ml of sewage, having BOD-500 mg/l, is diluted to 200 ml, and incubated for 5 days at 20°C. If the D.O. content after 5 days is found to be 5 mg/l, what was the initial D.O. content of the diluted sample?

a) 10 mg/l

b) 5 mg/l

c) 1 mg/l

d) none of the above

10 / 30

10. Normally the shape of the demand line is

a) straight

b) curved

c) both of the above

d) none of the above

11 / 30

11. The disinfection efficiency of chlorination

a) increases with the temperature of water

b) decreases with the temperature of water

c) not affected by temperature

d) none of the above

12 / 30

12. 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

13 / 30

13. The water supply demand in a fully plumbed system in Nepal context

a) 45 lpcd

b) 65 lpcd

c) 112 lpcd

d) 135 lpcd

14 / 30

14. 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

15 / 30

15. Excess concentration of sodium salts in water causes

a) hardness

b) bitter taste

c) alkalinity

d) laxative effect

16 / 30

16. Aqueducts are generally not designed in

a) circular section

b) rectangular section

c) horse-shoe section

d) vee section

17 / 30

17. The location of a well is considered good if it is sunk into

a) coarse gravel

b) silt

c) sand

d) clay

18 / 30

18. The presence of hydrogen sulfide in water causes:

a) softening

b) acidity

c) alkalinity

d) bad taste

19 / 30

19. An egg-shaped section of sewer:

a) is economical than a circular section

b) is more stable than a circular section

c) provides self-cleansing velocity at low discharge

d) all of the above

20 / 30

20. 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

21 / 30

21. Minimum required residual head at the public tap stand is not less than

a) 15

b) 10

c) 5

d) 20

22 / 30

22. Inverted siphon is called:

a) special sewer

b) general sewer

c) storm sewer

d) none of the above

23 / 30

23. 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

24 / 30

24. 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

25 / 30

25. PH value of water for water supply

a) 6.5 to 8.5

b) 5.5 to 7.0

c) 7.0 to 9.5

d) 5.5 to 9.5

26 / 30

26. Water demand of a city includes

a) domestic water demand

b) commercial and industrial demand

c) fire and public-use demand

d) all of the above

27 / 30

27. What will be the daily per capita water demand for a city of 0.2 million people whose total water requirement per annum is 19,710,000 cubic meters?

a) 250 liters

b) 280 liters

c) 270 liters

d) 260 liters

28 / 30

28. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

29 / 30

29. Pressure relief valve is provided to prevent

a) the increase of pressure after a certain limit

b) back flow when the pump is stopped

c) the water flowing out of the suction pipe

d) none of the above

30 / 30

30. According to the guidelines of DWSS, the maximum number of users in each stand post should be:

a) 50

b) 100

c) 150

d) 200

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Water Supply & Sanitation Engineering Online Test – Paper 2

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