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. 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

2 / 30

2. Where it is not possible to obtain self-cleansing velocities for sewers, flush are provided with the minimum available head of:

a) 1-3 m

b) 3-5 m

c) 5-7 m

d) 7-10 m

3 / 30

3. Where manholes shall be installed in a sewer system?

a) At the middle of each line

b) At all intersections, changes in grade, size, alignment

c) At ends of a curvilinear sewer

d) At distances not greater than 50m

4 / 30

4. An aquiclude is

a) a non-artesian aquifer

b) a large underground water body

c) a confined bed of impervious material between aquifers

d) an artesian aquifer

5 / 30

5. 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

6 / 30

6. The velocity of water in water mains of 40 cm diameter is usually kept

a) below 0.5 m/sec

b) below 5 m/sec

c) below 1.8 m/sec

d) below 18 m/sec

7 / 30

7. The capacity of Guheswari STP is:

a) 15.4 Mld

b) 1.1 Mld

c) 0.50 Mld

d) 12.1 Mld

8 / 30

8. A sanitary sewer is expected to run:

a) full

b) half-full

c) 2/3 full

d) 90% full

9 / 30

9. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

10 / 30

10. The bacteria which require free oxygen for their survival are called:

a) aerobic bacteria

b) anaerobic bacteria

c) facultative bacteria

d) none of the above

11 / 30

11. 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

12 / 30

12. 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

13 / 30

13. Find the BOD with the following data: initial oxygen = 9 PPM, final oxygen = 4 PPM sewage sample 200 ml and diluted sewage = 4 ppm.

a) 180 PPM

b) 320 PPM

c) 200 PPM

d) 250 PPM

14 / 30

14. Which metal is good for keeping drinking water?

a) copper

b) brass

c) zinc

d) iron

15 / 30

15. Water for domestic consumption should be:

a) colorless, odorless & tasteless

b) free from dissolved salts

c) hygienically safe

d) attractive for looks

16 / 30

16. 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%

17 / 30

17. Digesters are used for:

a) the sludge digestion under optimum conditions

b) the sludge digestion under normal conditions

c) the sludge digestion under extreme conditions

d) none of the above

18 / 30

18. An advantage of the intermittent system of the water supply system:

a) Repairs can be carried out during non-supply hours

b) Chances of wastage of water are less

c) Less quantity of water is used

d) All of the above

19 / 30

19. Factors considered in the selection of the site for the intake point are that it should be

a) nearer to the treatment plant

b) in the pure zone of the water source

c) upstream of the point of disposal of wastewater

d) all of the above

20 / 30

20. Advantage of pressure conduits is

a) flow is independent of the grade of the hydraulic grade line

b) economical since it follows a shorter path

c) less chance of water pollution as it is closed

d) all of the above

21 / 30

21. 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

22 / 30

22. Two sewer sections laid at the same grade will be hydraulically equivalent if:

a) their discharge capacity when running full is equal

b) their flow velocity when running full is equal

c) their flowing areas when running full are equal

d) all the above factors are equal

23 / 30

23. 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

24 / 30

24. Which is the oldest waterworks in Nepal?

a) Bhim Dhara scheme

b) Bir Dhara scheme

c) Sundarijal scheme

d) Dudh Pokhari scheme

25 / 30

25. A 1 m cast iron pipe carries a discharge of 0.785 cum/sec, the velocity of flow will be

a) 0.9 m/sec

b) 1.0 m/sec

c) 1.2 m/sec

d) none of the above

26 / 30

26. Presence of algae in water indicates that the water is

a) hard

b) soft

c) acidic

d) pure

27 / 30

27. Pump efficiency is 85%, motor efficiency is 94% then the combined efficiency of the two is

a) 90%

b) 80%

c) 70%

d) 85%

28 / 30

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

a) thermometer

b) tintometer

c) turbidity meter

d) barometer

29 / 30

29. 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

30 / 30

30. At the socket and spigot joint,

a) the enlarged end of the pipe is called a socket

b) the normal end of the pipe is called a spigot

c) the spigot is fitted into the socket

d) all of the above

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