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%
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Certificate: No
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1 / 30

1. The sewer meant to carry excess discharge from an existing sewer is called:

a) main sewer

b) trunk sewer

c) outfall sewer

d) relief sewer

2 / 30

2. Aeration of water is done by

a) spray nozzles

b) cascading

c) trickling bed

d) all of the above

3 / 30

3. The difference between a septic tank and an imhoff tank is that in an imhoff tank:

a) digestion takes place in a different compartment

b) it is suitable for serving a much bigger population

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

d) none of the above

4 / 30

4. Turbidity of water sample depends on

a) concentration and density of suspended and colloidal solids

b) concentration of suspended, colloidal, and dissolved solids

c) concentration of organic and inorganic matter

d) concentration, size, shape, and refractive index of suspended solids

5 / 30

5. The factor to be considered for the source of water supply is:

a) quantity and quality of available water

b) elevation of the sources of water

c) general terrain intervening the area

d) all of the above

6 / 30

6. 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

7 / 30

7. Disinfection of water involves.....

a) killing of diseases bacteria

b) produce of diseases of water

c) no change diseases bacteria

d) none of the above

8 / 30

8. Goitre is due to

a) chlorine

b) bromine

c) iodine

d) all of the above

9 / 30

9. 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

10 / 30

10. For an insignificant effect on the water table, the tube wells are spaced as one in every

a) 0.5 sq km

b) 1.0 sq km

c) 1.5 sq km

d) 2.0 sq km

11 / 30

11. Growth of the population can be conveniently represented by

a) arithmetical curve

b) geographical curve

c) logistic curve

d) straight line curve

12 / 30

12. The distribution mains in a water supply system are designed for

a) maximum daily demand

b) peak hourly demand

c) average daily demand

d) maximum hourly demand on the maximum consumption day

13 / 30

13. The water which is not chemically pure but does not contain anything harmful to human health is known as

a) pure water

b) wholesome water

c) polluted water

d) none of the water

14 / 30

14. During the water test of sewer, 2 lit/cm of dia/km of sewer line may be allowed for a period of:

a) 5 minutes

b) 30 minutes

c) 15 minutes

d) 20 minutes

15 / 30

15. 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

16 / 30

16. The colour of water is measured on the platinum cobalt scale with the help of

a) thermometer

b) tintometer

c) turbidity meter

d) barometer

17 / 30

17. 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

18 / 30

18. Which is in the correct order?

a) house s.-Lateral s.-Branch s.-Sub-main s.-Main (Trunk)-outfall sewer

b) house s.-Lateral s.-Branch s.-Sub-main s.-Outfall s.-Main (Trunk) sewer

c) main (Trunk)-Outfall s.-House s.-Lateral s.-Branch s.-Sub-main sewer

d) lateral s.-Branch s.-Sub-main s.-Main (Trunk)-Outfall s-House sewer

19 / 30

19. PVC pipes can withstand pressure up to

a) 20 m head of water

b) 50 m head of water

c) 100 m head of water

d) 150 m head of water

20 / 30

20. The common pipe used in house plumbing is:

a) PVC

b) HDPE

c) GI

d) CI

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. Water of zero hardness is obtained by

a) boiling

b) lime-soda process

c) base exchange process

d) none of the above

23 / 30

23. Sterilized water is generally used for

a) domestic

b) medical

c) public

d) all of the above

24 / 30

24. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

25 / 30

25. 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

26 / 30

26. 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

27 / 30

27. 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

28 / 30

28. Inverted siphon is made of:

a) one pipe

b) two pipes

c) three pipes

d) four pipes

29 / 30

29. The per capita consumption of a locality will be more when

a) good-quality water is supplied

b) during summer months

c) distribution pressure is increased

d) all of the above

30 / 30

30. Hydrants are used for tapping water from mains for:

a) fire extinguishing

b) street washing

c) flushing sewer lines

d) all of the above

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Water Supply & Sanitation Engineering Online Test – Paper 2

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