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. Water to the consumers may be supplied from

a) rainy wells sunk to the water level

b) infiltration well dug out on the banks of rivers

c) infiltration galleries connected to a sump well

d) all of the above

2 / 30

2. The ratio of the maximum daily consumption to the average demand is

a) 1.2

b) 1.5

c) 1.8

d) 2.7

3 / 30

3. In an egg-shaped sewer section, the maximum discharge occurs when the depth of flow is: (where d is the total depth of the section)

a) 0.25d

b) 0.50d

c) 0.75d

d) 0.95d

4 / 30

4. 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

5 / 30

5. Baffle wall in septic tank is:

a) Short side wall

b) Long side wall

c) Honeycomb inner wall

d) None of the above

6 / 30

6. Anti-siphonage pipe is connected to:

a) Top of PWC

b) Bottom of PWC

c) In the main pipe

d) None of the above

7 / 30

7. The shape of the trunk and outfall type of sewer is usually:

a) circular

b) rectangular type

c) horse-shoe type

d) egg-shaped type

8 / 30

8. If the diameter of the main pipe is taken less than the economical diameter, then

a) head loss will be high

b) cost of pipe will be less

c) cost of pumping will be more

d) all of the above

9 / 30

9. 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

10 / 30

10. 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

11 / 30

11. If 10 ml of raw sewage is diluted to 250 ml, and the dissolved oxygen content of the diluted sample changes from 9 mg/l to 5 mg/l after incubation at 20°C. for 5 days, BODs of raw sewage is:

a) 0.16 mg/l

b) 4 mg/l

c) 10 mg/l

d) 100 mg/l

12 / 30

12. Excess concentration of magnesium salts in water causes

a) hardness

b) bitter taste

c) alkalinity

d) laxative effect

13 / 30

13. 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

14 / 30

14. 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

15 / 30

15. Poppet valve is a type of

a) air valve

b) blow-off valve

c) sluice valve

d) none of the above

16 / 30

16. Sterilized water is generally used for

a) domestic

b) medical

c) public

d) all of the above

17 / 30

17. The pipe used to carry discharge from sanitary fittings like bathrooms, kitchens, etc., is:

a) waste pipe

b) soil pipe

c) vent pipe

d) anti-siphonage pipe

18 / 30

18. The service 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. The SODIS method of water purification is a process of:

a) Chlorination

b) Solar disinfection

c) System of disinfected integral supply

d) Supply of disinfected and improved water system

20 / 30

20. The slope of the hydraulic grade line is always towards the well due to pumping. This line of depressed water table is called

a) drawdown curve

b) circle of influence

c) dynamic gradient

d) an inverted cone of depression

21 / 30

21. According to the guidelines of DWSS, the maximum number of users in each stand post should be:

a) 50

b) 100

c) 150

d) 200

22 / 30

22. 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

23 / 30

23. 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

24 / 30

24. 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

25 / 30

25. 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

26 / 30

26. 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

27 / 30

27. The highest non-scouring velocity in a sewer may be allowed in:

a) cast iron sewer

b) glazed brick sewer

c) cement concrete

d) stone ware sewer

28 / 30

28. Any trap is intended to trap foul gases with the provision of:

a) clear seal

b) sewage or sullage

c) otta seal

d) water seal

29 / 30

29. From the septic tank, the effluents are discharged into:

a) drainage

b) soak pit

c) sewer

d) none 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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