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. Aeration of water is done by

a) spray nozzles

b) cascading

c) trickling bed

d) all of the above

2 / 30

2. The term "septic" refers to.....?

a) Anaerobic bacterial environment that develops in the tank

b) Refers to safety and precaution

c) Drainage of waste materials

d) Aerobic bacterial environment that develops in the tank

3 / 30

3. The last trap provided in a house drainage system is:

a) q-trap

b) floor trap

c) nahni trap

d) interception trap

4 / 30

4. If D is the diameter of the upper circular portion, the overall depth of a standard egg-shaped section, is:

a) D

b) 1.2D

c) 1.5D

d) 2D

5 / 30

5. The maximum pressure which the pipe can withstand without any leakage during the hydrostatic pressure test is called

a) working pressure

b) test pressure

c) design pressure

d) none of the above

6 / 30

6. 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

7 / 30

7. The presence of hydrogen sulfide in water causes:

a) softening

b) acidity

c) alkalinity

d) bad taste

8 / 30

8. The coverage of water supply in Nepal as per the census of 2011 is

a) 90%

b) 75%

c) 85%

d) 70%

9 / 30

9. The type of joint generally used in cast-iron pipes is

a) flanged joint

b) socket and spigot joint

c) dresser coupling joint

d) all of the above

10 / 30

10. Absolutely soft waters are required for

a) drinking

b) boilers

c) prevention of corrosion in pipes

d) washing with synthetic detergent soap

11 / 30

11. 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

12 / 30

12. The detention time in a septic tank is usually:

a) 1-2 hours

b) 5-6 hours

c) 18-24 hours

d) 22-24 hours

13 / 30

13. Corrosion of well pipes can be reduced by:

a) using thicker pipes

b) reducing the flow velocity

c) reducing the draw dawn

d) all of the above

14 / 30

14. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

15 / 30

15. As compared to shallow tube wells, deep wells have

a) more depth

b) less depth

c) more discharge

d) less discharge

16 / 30

16. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

17 / 30

17. A sewer that collects sewage from toilets is called:

a) lateral sewer

b) branch sewer

c) main sewer

d) outfall sewer

18 / 30

18. The main pipes must be designed to carry

a) 3 times the average demand

b) 4 times the average demand

c) 1 times the average demand

d) 2 times the average demand

19 / 30

19. To determine the velocity of the flow of underground water, the most commonly used non-empirical formula is....formula:

a) Darcy's

b) Slitcher's

c) Hazen's

d) Lacy's

20 / 30

20. 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

21 / 30

21. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

22 / 30

22. 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

23 / 30

23. Surface water is obtained from

a) well

b) spring

c) artesian well

d) rain

24 / 30

24. Groundwater is generally free from

a) suspended impurities

b) dissolved impurities

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

d) none of the above

25 / 30

25. 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

26 / 30

26. The types of formwork provided for ferrocement tank in rural water supply schemes are

a) steel

b) wood

c) HDP pipe

d) all of the above

27 / 30

27. Which is the oldest waterworks in Nepal?

a) Bhim Dhara scheme

b) Bir Dhara scheme

c) Sundarijal scheme

d) Dudh Pokhari scheme

28 / 30

28. 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

29 / 30

29. Which one is correct?

a) Baylis turbidity meter is used to measure turbidity 0-20 PPM

b) Hellige turbidity meter is used to measure turbidity 0-50 PPM

c) Jackson turbidity meter is used to measure turbidity 50-1000 PPM

d) all of the above

30 / 30

30. Rotary pumps are suited for

a) small discharge

b) large discharge

c) high head

d) none of the above

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