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. For separate and partially separate systems, the pattern of collection suitable is:

a) perpendicular pattern

b) interceptor pattern

c) radial pattern

d) fan pattern

2 / 30

2. 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

3 / 30

3. A sewer, which gets its flow from a number of transverse sewers, is known as:

a) interceptor

b) interconnector

c) head sewer

d) branch sewer

4 / 30

4. Lead in water causes

a) plumbo solvency

b) stains on clothes and paper

c) damages water systems

d) permanent bluish skin

5 / 30

5. As per Buston's formula, fire demand for in liters per minute for a population of p in thousands, is given by

a) 5663 √p

b) 3182 √p

c) 4640 √p

d) none of the above

6 / 30

6. Which traps have perpendicular legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

7 / 30

7. In the one-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

8 / 30

8. Treatment of sewage of small estates and colonies is done by:

a) aerated lagoon

b) oxidation pond

c) oxidation ditch

d) all of the above

9 / 30

9. The valve provided after the pump in the rising mains to prevent the back flow of water when the pump is stopped is

a) air relief valve

b) reflux valve

c) sluice valve

d) all of the above

10 / 30

10. The odour of water can be determined by...

a) microscope

b) telescope

c) sonoscope

d) osmoscope

11 / 30

11. The most suitable excreta disposal unit for human excreta is:

a) Privy pit

b) Cesspool

c) Soak pit

d) None of the above

12 / 30

12. Aeration of water is done by

a) spray nozzles

b) cascading

c) trickling bed

d) all of the above

13 / 30

13. The factor for the selection of the pumping station site is

a) distance of the source of contamination or pollution

b) height above the H.F.L. of the river

c) future expansion

d) all of the above

14 / 30

14. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

15 / 30

15. The minimum height of a flushing cistern is:

a) 1 m

b) 2 m

c) 3 m

d) 5 m

16 / 30

16. 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

17 / 30

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

a) 1

b) 2

c) 3

d) 4

18 / 30

18. 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

19 / 30

19. 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

20 / 30

20. The gradient of a sewer is:

a) given in the direction of the natural slope of the ground

b) given in the opposite direction of the natural slope of the ground

c) zero

d) more than 1 in 20

21 / 30

21. 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

22 / 30

22. Aqueducts are generally not designed in

a) circular section

b) rectangular section

c) horse-shoe section

d) vee section

23 / 30

23. A heavy metal having non-toxic property

a) lead

b) copper

c) zinc

d) silver

24 / 30

24. In Chezy's formula v=c√ms for calculating the velocity of flow in a circular sewer, the Chezy's constant c depends upon:

a) size of the sewer

b) shape of the sewer

c) roughness of the sewer

d) all of the above

25 / 30

25. Detention time for the detritus tank is:

a) 1-2 minutes

b) 2-3 minutes

c) 3-4 minutes

d) 4-5 minutes

26 / 30

26. The asbestos cement pipes are generally laid

a) horizontally

b) vertically

c) in any position

d) inclined at 60°

27 / 30

27. 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

28 / 30

28. The average discharge of a tube-well is about

a) 5 liters/sec

b) 50 liters/sec

c) 100 liters/sec

d) 500 liters/sec

29 / 30

29. The rate of flow in an artesian spring is continuous and

a) increases in the rainy season

b) is constant in all conditions

c) increases as the water table rises

d) decreases in the drought season

30 / 30

30. Grade aqueducts are not allowed to run

a) one-fourth full

b) half

c) three

d) full

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Water Supply & Sanitation Engineering Online Test – Paper 2

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