Water Supply & Sanitation Engineering Online Test – Paper 2

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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. 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

2 / 30

2. Groundwater is generally free from

a) suspended impurities

b) dissolved impurities

c) both (a) and (b) of the above

d) none of the above

3 / 30

3. As compared to cast iron pipes, steel pipes are

a) stronger

b) heavier

c) costlier

d) all of the above

4 / 30

4. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

5 / 30

5. 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

6 / 30

6. Depth of shallow tube well shall not be more than (considering economic point)

a) 30 m

b) 40 m

c) 50 m

d) 60 m

7 / 30

7. The sewerage system originates from:

a) main sewers

b) branch sewers

c) lateral sewers

d) house sewers

8 / 30

8. When the limiting non-scouring velocity is 5 m/sec, the type of sewer generally used is:

a) stone ware sewer

b) cast iron sewer

c) brick sewer

d) glazed brick sewer

9 / 30

9. 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

10 / 30

10. Coefficient of permeability is maximum for

a) clean gravel

b) clay

c) fine sand

d) silt

11 / 30

11. Priming is the process of

a) removing the trapped air from the pump

b) removing the trapped water from the pump

c) removing the debris waste from the pump

d) all of the above

12 / 30

12. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

13 / 30

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

a) low

b) steep

c) maximum (i.e., vertical)

d) zero

14 / 30

14. The water collected for the sample from the

a) 10-20 cm below from the surface

b) 20-30 cm below from the surface

c) 30-40 cm below from the surface

d) 40-50 cm below from the surface

15 / 30

15. 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

16 / 30

16. Sewer preferred for a combined system of sewage is:

a) rectangular sewer

b) circular sewer

c) egg-shaped sewer

d) all of the above

17 / 30

17. 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%

18 / 30

18. The capacity of Guheswari STP is:

a) 15.4 Mld

b) 1.1 Mld

c) 0.50 Mld

d) 12.1 Mld

19 / 30

19. Laying of a sewer is generally done with the help of:

a) sight rails and boning rod

b) theodolite and staff

c) leveling and staff

d) all of the above

20 / 30

20. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

21 / 30

21. Which type of distribution system will you follow if the reduced level of the source of water is 100 m while the reduced level of the town is 50 m?

a) gravity system

b) pumping system

c) dual system

d) none of the above

22 / 30

22. Abbreviation which is correct?

a) TOC (Total Organic Carbon)

b) ThOD (Theoretical Oxygen Demand)

c) TOD (Total Oxygen Demand)

d) all of the above

23 / 30

23. 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

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. Clean out is provided in the underground......sewer in place of manhole.

a) main sewer

b) trunk sewer

c) outfall sewer

d) lateral sewer

26 / 30

26. The water supply demand in a day school without a boarder should be

a) 10 lpcd

b) 20 lpcd

c) 30 lpcd

d) 40 lpcd

27 / 30

27. Iron in water causes

a) stains on clothes

b) eutrophication

c) rust

d) corrosion

28 / 30

28. Iron and manganese are estimated by

a) jar test

b) winkler test

c) calorimetric test

d) none of the above

29 / 30

29. Pick up the correct statement:

a) If PH<7 then sewage is acidic

b) If PH>7 then sewage is alkaline

c) If PH=7 the sewage is neutral

d) all of the above

30 / 30

30. 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

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Water Supply & Sanitation Engineering Online Test – Paper 2

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