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. Sickness of tube well indicates a) increase in well b) reduction in yield c) suffering from waterborne disease d) all of the above 2 / 50 2. 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 3 / 50 3. 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 4 / 50 4. 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 5 / 50 5. 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 6 / 50 6. Which test is a must for a house sewer? a) water test b) air test c) compaction test d) smoke test 7 / 50 7. Widely used pipe for rural water supply in Nepal is: a) HDPE pipes b) GI pipes c) PVC pipes d) CI pipes 8 / 50 8. Which traps have parallel legs? a) P-Trap b) Q-Trap c) gully trap d) S-Trap 9 / 50 9. Inspection arm is provided in: a) manhole b) drop manhole c) lamp hole d) clean out 10 / 50 10. Turbidity is measured on.......... a) standard silica scale b) standard cobalt scale c) diagonal scale d) none of the above 11 / 50 11. 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 12 / 50 12. A lamp hole is helpful in: a) illuminating sewer line b) cleaning sewer line c) repairing d) testing sewers 13 / 50 13. Grade aqueducts are not allowed to run a) one-fourth full b) half c) three d) full 14 / 50 14. Water horsepower of a pump is given by a) WHQ / 75 b) WHQ / 360 c) WHQ / 220 d) WHQ / 85 15 / 50 15. Sanitary sewage means: a) domestic sewage b) industrial sewage c) both (a) and (b) above d) none of the above 16 / 50 16. True colour of water is due to a) suspended solids b) colloidal solids c) volatile solids d) acids in solution 17 / 50 17. The working chamber of a manhole, along the direction of flow should have a minimum length for depth more than 0.8m: a) 0.6 m b) 0.9 m c) 1.2 m d) 2.4 m 18 / 50 18. The per capita consumption of a locality is affected by a) climatic condition b) quality of water c) distribution pressure d) all of the above 19 / 50 19. The open channels supported above the ground over trestles are called a) tunnel b) aqueduct c) flume d) conduit 20 / 50 20. The capacity of a flushing cistern for water closets is: a) 1-2 liters b) 10-15 liters c) 5 liters d) 20-25 liters 21 / 50 21. Physical characteristics of sewage include: a) Turbidity b) Color c) Odor d) All of the above 22 / 50 22. The commonly used material for water supply pipes having the property of not easily corroded, strong, long life but heavy and brittle is a) steel b) cast iron c) wrought iron d) RCC 23 / 50 23. After incubating a 2.5% solution of a sewage sample for 5 days at 20°C, the depletion of oxygen was found to be 5 PPM. The BOD of the sewage will be recorded as: a) 5 PPM b) 50 PPM c) 100 PPM d) 200 PPM 24 / 50 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 / 50 25. 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 26 / 50 26. Iron and manganese are estimated by a) jar test b) winkler test c) calorimetric test d) none of the above 27 / 50 27. 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 28 / 50 28. Coefficient of permeability is maximum for a) clean gravel b) clay c) fine sand d) silt 29 / 50 29. 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 30 / 50 30. 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 31 / 50 31. The peak water consumption hours as recommended by the Department of Water Supply and Sewerage (DWSS) is.... hours. a) 5.00-7.00 b) 7.00-12.00 c) 12.00-17.00 d) 17.00-19.00 32 / 50 32. Selection of material for the pipe depends on a) carrying capacity of the pipe b) durability and life of the pipe c) effect of water to be conveyed on the pipe material d) all of the above 33 / 50 33. The minimum diameter of a sewer pipe should be: a) 5 cm b) 10 cm c) 15 cm d) 25 cm 34 / 50 34. 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 35 / 50 35. Sterilization is the process of a) killing of diseases bacteria b) produce of diseases of water c) no change diseases bacteria d) eliminating all life 36 / 50 36. Turbidity of water is measured in a) mg/1 b) Nephelometric Turbidity Unit (NTU) c) potassium chloroplatinate units d) threshold number 37 / 50 37. As compared to cast iron pipes, steel pipes are a) stronger b) heavier c) costlier d) all of the above 38 / 50 38. Service connections to consumer houses are generally provided with a) copper pipes b) PVC pipes c) galvanized pipes d) cast iron pipes 39 / 50 39. A sanitary sewer is expected to run: a) full b) half-full c) 2/3 full d) 90% full 40 / 50 40. The most suitable excreta disposal unit for human excreta is: a) Privy pit b) Cesspool c) Soak pit d) None of the above 41 / 50 41. Purest water may have a) no colour b) faint blue-green colour c) dark blue colour d) brownish-yellow colour 42 / 50 42. 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 43 / 50 43. Which is in the correct order? a) house s.-Lateral s.-Branch s.-Sub-main s.-Main (Trunk)-outfall sewer b) house s.-Lateral s.-Branch s.-Sub-main s.-Outfall s.-Main (Trunk) sewer c) main (Trunk)-Outfall s.-House s.-Lateral s.-Branch s.-Sub-main sewer d) lateral s.-Branch s.-Sub-main s.-Main (Trunk)-Outfall s-House sewer 44 / 50 44. From the septic tank, the effluents are discharged into: a) drainage b) soak pit c) sewer d) none of the above 45 / 50 45. 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 46 / 50 46. In a circular sewer if depth of flow is 0.2 times the full depth, the nominal gradient: a) is only provided b) is doubled c) three d) none of the above 47 / 50 47. As the diameter of the sewer increases, the self-cleaning velocity: a) increases b) decreases c) remains constant d) depends on other factors 48 / 50 48. In the one-pipe system of plumbing, the number of vertical pipes is: a) 1 b) 2 c) 3 d) 4 49 / 50 49. Computation of discharges is difficult for: a) dead-end system b) grid iron system c) ring system d) radial system 50 / 50 50. The factor for the selection of the pumping station site is a) distance of the source of contamination or pollution b) height above the H.F.L. of the river c) future expansion 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! LinkedIn Facebook Twitter 0% Restart Test Please provide your feedback. Thank you for your valuable feedback. 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