Home» Online Test » Civil Engineering » Water Supply & Sanitation Engineering Online Test » Paper 1 » Paper 2 » Paper 3 0% Sorry, time's up. To complete the online test, please restart it. Created by Vikash chaudhary This is a FREE online test. Beware of scammers who ask for money to attend this test. Get New Questions in Each Attempt Total Questions: 50 Time Allotted: 50 minutes Passing Score: 70% Randomization: Yes Certificate: Yes Do not refresh the page! 👍 All the best! 1 / 50 1. The alum, when mixed with water as a coagulant...... PH value of water. a) decreases b) increases c) no change d) none of the above 2 / 50 2. The sewerage system originates from: a) main sewers b) branch sewers c) lateral sewers d) house sewers 3 / 50 3. Absolutely soft waters are required for a) drinking b) boilers c) prevention of corrosion in pipes d) washing with synthetic detergent soap 4 / 50 4. The minimum diameter of a sewer pipe should be: a) 5 cm b) 10 cm c) 15 cm d) 25 cm 5 / 50 5. 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 6 / 50 6. The type of joint used in HDP pipe is a) butt welding b) solvent welding c) thread joint d) dresser coupling joint 7 / 50 7. The sewage in an inverted siphon will flow under what condition? a) Air b) Vacuum c) Pressure d) Gravity 8 / 50 8. Sewer which gets discharge from two or more main sewers is called: a) main sewer b) trunk sewer c) combined sewer d) intercepting sewer 9 / 50 9. The most widely used tube well in Nepal is a) strainer well b) cavity well c) slotted d) perforated well 10 / 50 10. In the two-pipe system of plumbing, the number of vertical pipes is: a) 1 b) 2 c) 3 d) 4 11 / 50 11. 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 12 / 50 12. Goitre is due to a) chlorine b) bromine c) iodine d) all of the above 13 / 50 13. The flow in the sewers is minimum during which hours? a) Night b) Morning c) Day d) Evening 14 / 50 14. Inverted siphon is called: a) special sewer b) general sewer c) storm sewer d) none of the above 15 / 50 15. R.M.O. means a) running b) maintenance c) operation d) all of the above 16 / 50 16. 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 17 / 50 17. A G.I. pipe has a coating of a) zinc b) lead c) silver d) aluminum 18 / 50 18. The fire demand of a city is generally calculated by a) underwriters formula b) freeman formula c) kuichling's formula d) all of the above 19 / 50 19. Pressure relief valve is provided in the water main a) to reduce the pressure b) upstream of the sluice c) at the low point d) all of the above 20 / 50 20. A goose neck is: a) a bent flexible pipe between ferrule and stop cock b) a T-shaped brass between ferrule and water meter c) a straight G.I. pipe between the service pipe and stop cock d) a bent rigid pipe between the service pipe and water meter 21 / 50 21. 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 22 / 50 22. Flush air inlets are sometimes called: a) ventilated lamp holes b) well hole c) clean outs d) flushing tank 23 / 50 23. Thrash rack/roughing filter is provided at the entrance of a) intake b) slow sand filter c) rapid sand filter d) all of the above 24 / 50 24. In the one-pipe system of plumbing, the number of vertical pipes is: a) 1 b) 2 c) 3 d) 4 25 / 50 25. Total quantity of reservoir is the sum of the following a) breakdown reserve b) fire reserve c) all of the above d) balancing reserve 26 / 50 26. If 10 ml of raw sewage is diluted to 250 ml, the dilution factor is: a) 24 b) 25 c) 1/25 d) none of the above 27 / 50 27. 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 28 / 50 28. A circular gravity aqueduct is preferred because of a) its maximum hydraulic mean depth b) maximum area per unit of wetted perimeter c) minimum cost of construction d) all of the above 29 / 50 29. In water analysis, the test carried out is a) physical b) chemical c) biological d) all of the above 30 / 50 30. 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 31 / 50 31. Surface water is obtained from a) well b) spring c) artesian well d) rain 32 / 50 32. Sewage is treated by aerobic bacteria action in: a) septic tank b) settling tank c) trickling filter d) oxidation pond 33 / 50 33. Which traps have curved legs? a) P-Trap b) Q-Trap c) gully trap d) S-Trap 34 / 50 34. Growth of the population can be conveniently represented by a) arithmetical curve b) geographical curve c) logistic curve d) straight line curve 35 / 50 35. Most suitable section, when the maximum and minimum flow ratio is not much, is: a) circular section b) rectangular section c) horse-shoe section d) egg-shaped section 36 / 50 36. The radius of influence of the well varies with a) rate of pumping b) water table c) types of well d) none of the above 37 / 50 37. Water for domestic consumption should be: a) colorless, odorless & tasteless b) free from dissolved salts c) hygienically safe d) attractive for looks 38 / 50 38. 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 39 / 50 39. 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 40 / 50 40. A sanitary sewer is expected to run: a) full b) half-full c) 2/3 full d) 90% full 41 / 50 41. The sewage consists of water: a) 80% b) 90% c) 95% d) 99.9% 42 / 50 42. Septic tank effluent is: a) quite clear and sparkling b) always odorless c) having fine organic solids with high BOD d) black tarry liquor with an earthy odor 43 / 50 43. Lead in water causes a) plumbo solvency b) stains on clothes and paper c) damages water systems d) permanent bluish skin 44 / 50 44. Anti-siphonage pipe is connected to: a) Top of PWC b) Bottom of PWC c) In the main pipe d) None of the above 45 / 50 45. The maximum amount of copper in domestic water should be a) up to 3 ppm b) up to 15 ppm c) up to 45 ppm d) all of the above 46 / 50 46. The clarigesters are: a) circular septic tanks b) circular imhoff double storage tanks without bottom hoppers c) rectangular septic tanks d) none of the above 47 / 50 47. The diameter of pipes in bathrooms and lavatories in domestic water supply is: a) 10 mm b) 12 mm c) 16 mm d) 20 mm 48 / 50 48. Gravity conduits are generally in the form of a) open channels b) conduits c) tunnels d) all of the above 49 / 50 49. In the above problem 151, using Manning's formula with n = 0.014 then the hydraulic gradient will be a) 1:200 b) 1:400 c) 1:800 d) 1:1000 50 / 50 50. The interference of the well depends upon a) the number of wells b) spacing between wells c) types of wells d) all of the above Please provide accurate information so we can send your Achievement Certificate by mail. NameEmailPhone Number Your score is Share your achievement! 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