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. Turbidity is undesirable because it

a) renders waters unpalatable

b) affects photosynthesis of aquatic life

c) causes milky unite coloration to water

d) causes red and brown stains

2 / 30

2. Goitre is due to

a) chlorine

b) bromine

c) iodine

d) all of the above

3 / 30

3. The velocity of flow does not depend on:

a) grade of sewer

b) hydraulic mean depth of sewer

c) roughness of sewer

d) length of sewer

4 / 30

4. 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

5 / 30

5. The suitable system of sanitation for an area having rainfall for only one season is:

a) separate system

b) combined system

c) partially combined system

d) all of the above

6 / 30

6. The working conditions in imhoff tanks are:

a) aerobic only

b) anaerobic only

c) aerobic in the lower and anaerobic in the upper compartment

d) anaerobic in the lower and aerobic in the upper compartment

7 / 30

7. 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

8 / 30

8. Sanitary sewage means:

a) domestic sewage

b) industrial sewage

c) both (a) and (b) above

d) none of the above

9 / 30

9. 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

10 / 30

10. What will happen if an induction motor pump is run under significantly low voltage continually?

a) Less water is pumped

b) High energy will be consumed, increasing the energy bill

c) The motor will make loud noise

d) The motor will ultimately burn-out

11 / 30

11. For a 150mm diameter sewer, the gradient required to generate self-cleaning velocity is:

a) 1 in 10

b) 1 in 100

c) 1 in 200

d) 1 in 300

12 / 30

12. 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

13 / 30

13. The gradient to be provided for sewers depends upon:

a) the diameter of the sewer

b) the discharge

c) sewer pipe material

d) all of the above

14 / 30

14. "A right-angled sleeve (valve) connected in the water main through which water is tapped for domestic supply is called:

a) service pipe

b) goose neck

c) ferrule

d) stop tap

15 / 30

15. If p is the population of a place in thousands then the fire demand of water in liters per minute, according to Kuichling formula, is given by

a) 5663 √p

b) 3182 √p

c) 4640 √p

d) none of the above

16 / 30

16. Grit is:

a) inert matter of specific gravity > 2.65

b) organic matter of specific gravity nearer to 1

c) organic and inert matter combined

d) colloidal matter of heavy specific gravity

17 / 30

17. To compensate for losses, thefts, and wastage of water, an allowance made of (as per NWSC)

a) 5%

b) 10%

c) 15%

d) 35%

18 / 30

18. Abbreviation which is correct?

a) TOC (Total Organic Carbon)

b) ThOD (Theoretical Oxygen Demand)

c) TOD (Total Oxygen Demand)

d) all of the above

19 / 30

19. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

20 / 30

20. It is practical to design sewer for the self-cleaning velocity at:

a) Ultimate peak flow

b) Maximum flow

c) Minimum flow

d) Extra flow

21 / 30

21. When the fall in elevation is greater than 60cm, the manhole provided is called:

a) lamp hole

b) flight manhole

c) drop manhole

d) fall manhole

22 / 30

22. Letache is observed in:

a) septic tank

b) sewage

c) landfill

d) none of the above

23 / 30

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

a) perpendicular pattern

b) interceptor pattern

c) radial pattern

d) fan pattern

24 / 30

24. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

25 / 30

25. 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

26 / 30

26. The inlet and outlet pipes of the septic tank are bent:

a) upward

b) downward

c) inlet upward and outlet downward

d) inlet downward and outlet upward

27 / 30

27. Turbidity is measured on..........

a) standard silica scale

b) standard cobalt scale

c) diagonal scale

d) none of the above

28 / 30

28. Aqueducts are generally not designed in

a) circular section

b) rectangular section

c) horse-shoe section

d) vee section

29 / 30

29. The color of septic sewage is:

a) grey

b) black

c) white

d) blue

30 / 30

30. The types of pump suitable for water as well as sewage

a) rotary pump

b) centrifugal pump

c) reciprocating pump

d) impulse pump

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