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. Time of concentration depends upon: a) slope of the catchment b) intensity of rainfall c) nature of soil d) all of the above 2 / 50 2. The types of pump suitable for water as well as sewage a) rotary pump b) centrifugal pump c) reciprocating pump d) impulse pump 3 / 50 3. 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 4 / 50 4. Strainer type tube wells are considered unsuitable for a) coarse gravel b) fine sand strata c) clean gravels d) all of the above 5 / 50 5. Nahni trap is made of: a) mud b) cast iron c) steel d) all of the above 6 / 50 6. Manholes on sewer lines are provided for: a) periodic cleaning b) providing air for oxidation c) removal of part of sewerage d) all of the above 7 / 50 7. Steel pipes are a) generally laid underground and no expansion joint is required b) connected by riveted or welded joints c) suitable for withstanding high internal pressure d) all of the above 8 / 50 8. The water supply demand in a day school without a boarder should be a) 10 lpcd b) 20 lpcd c) 30 lpcd d) 40 lpcd 9 / 50 9. 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 10 / 50 10. Per capita water demand is calculated in liters a) per person per day b) per person per month c) per person per year d) none of the above 11 / 50 11. Septic tanks are best suited for: a) municipalities b) industries c) scattered residences d) congested areas 12 / 50 12. The water carriage sewage system: a) is cheaper in initial cost than dry conveyance system b) requires treatment before disposal c) creates a hygienic problem d) all of the above 13 / 50 13. 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 14 / 50 14. The minimum diameter of a sewer pipe should be: a) 5 cm b) 10 cm c) 15 cm d) 25 cm 15 / 50 15. In Chezy's formula v=c√ms for calculating the velocity of flow in a circular sewer, the Chezy's constant c depends upon: a) size of the sewer b) shape of the sewer c) roughness of the sewer d) all of the above 16 / 50 16. Inverted siphon is called: a) depressed sewer b) sag sewer c) both of the above d) none of the above 17 / 50 17. Clean out is provided in the underground......sewer in place of manhole. a) main sewer b) trunk sewer c) outfall sewer d) lateral sewer 18 / 50 18. 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 19 / 50 19. The curve showing the level of water in a well and the original water table is known as a) inverted cone of depression b) drawdown curve c) circle of influence d) all of the above 20 / 50 20. The sewer pipes: a) carry sewage as gravity conduits b) should resist the wear and tear caused due to abrasion c) are designed for generating self-cleaning velocities at different discharge d) all of the above 21 / 50 21. In the partially ventilated single-stack system of plumbing, the number of vertical pipes is: a) 1 b) 2 c) 3 d) 4 22 / 50 22. Sewer which gets discharge from two or more main sewers is called: a) main sewer b) trunk sewer c) combined sewer d) intercepting sewer 23 / 50 23. Odour is measured in terms of... a) threshold number b) reynold number c) mach number d) none of the above 24 / 50 24. Water of zero hardness is obtained by a) boiling b) lime-soda process c) base exchange process d) none of the above 25 / 50 25. 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 26 / 50 26. Kidney damage may be caused due to excess concentration of a) fluorides b) nitrates c) chlorides d) nitrites 27 / 50 27. The pattern of sanitation most suitable for a sloppy area is: a) zone pattern b) fan pattern c) radial pattern d) perpendicular pattern 28 / 50 28. 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 29 / 50 29. The object of cowl is to: a) give an ornamental look b) prevent the entry of rainfall into the waste pipe c) quickly dispel foul gases d) prevent nest building 30 / 50 30. 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 31 / 50 31. Turbidity is measured by the a) concentration of suspended solids collected after centrifuging b) concentration of colloidal and suspended solids after sedimentation c) intensity of light scattered when light is passed through d) difference in suspended solid concentration before and after filtration 32 / 50 32. Salvaging is: a) extraction of essence from waste b) dumping of solid waste c) sanitary land filling of solid waste d) none of the above 33 / 50 33. Aqueducts are generally not designed in a) circular section b) rectangular section c) horse-shoe section d) vee section 34 / 50 34. If Q is discharge in cubic meters per second and D is the economical diameter of the pipe, then according to Lea a) D = 0.67 to 0.87 √Q b) D = 0.67 to 0.97 √Q c) D = 0.97 to 1.22 √Q d) D = 1.22 to 1.32 √Q 35 / 50 35. Source of water in the mountains is: a) tube well b) well c) stream d) none of the above 36 / 50 36. Dyspepsia (Indigestion) is caused due to a) iron b) carbon c) manganese d) all of the above 37 / 50 37. Abbreviation which is correct? a) TOC (Total Organic Carbon) b) ThOD (Theoretical Oxygen Demand) c) TOD (Total Oxygen Demand) d) all of the above 38 / 50 38. Baffle wall in septic tank is: a) Short side wall b) Long side wall c) Honeycomb inner wall d) None of the above 39 / 50 39. 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 40 / 50 40. The open channels supported above the ground over trestles are called a) tunnel b) aqueduct c) flume d) conduit 41 / 50 41. Hydrants are used for tapping water from mains for: a) fire extinguishing b) street washing c) flushing sewer lines d) all of the above 42 / 50 42. Grit chamber has a detention period of: a) 45 sec to 90 sec b) 2 min to 5 min c) 20 min to 30 min d) 2 hours to 4 hours 43 / 50 43. 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 44 / 50 44. The maximum diameter of a sewer pipe should preferably be: a) 100 cm b) 200 cm c) 300 cm d) 450 cm 45 / 50 45. A pressure conduit laid underground may not be subjected to a) internal pressure of water b) pressure due to external load c) longitudinal temperature stress d) all of the above 46 / 50 46. The type of joint used in plastic pipe is a) butt welding b) solvent welding c) thread joint d) dresser coupling joint 47 / 50 47. Widely used pipe for rural water supply in Nepal is: a) HDPE pipes b) GI pipes c) PVC pipes d) CI pipes 48 / 50 48. 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 49 / 50 49. Gravity conduits a) carry water under gravity b) follow the hydraulic gradient line c) are carried through tunnels in deep cutting d) all of the above 50 / 50 50. The location of a well is considered good if it is sunk into a) coarse gravel b) silt c) sand d) clay 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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