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. Iron and manganese are estimated by a) jar test b) winkler test c) calorimetric test d) none of the above 2 / 50 2. The minimum size of a fire hydrant is: a) 5 cm b) 10 cm c) 15 cm d) 50 cm 3 / 50 3. Rotary pumps are suited for a) small discharge b) large discharge c) high head d) none of the above 4 / 50 4. Before entering a manhole, a candle is lowered into the manhole: a) to illuminate it b) to detect toxic gases c) to give a signal to the adjacent manhole d) to find out the presence of oxygen 5 / 50 5. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is: a) 95.95% b) 96.05% c) 96.86% d) 100% 6 / 50 6. Minimum depth of infiltration gallery is a) 2 m b) 3 m c) 4 m d) 5 m 7 / 50 7. Impetus valve/waste valve is provided in a) hydraulic ram b) centrifugal pump c) rotary pump d) all of the above 8 / 50 8. The most dangerous metal for human health is a) zinc b) copper c) lead d) iron 9 / 50 9. With the increase in the size of the water pipe, the permissible velocity (If discharge is constant) a) decreases b) increases c) remains constant d) none of the above 10 / 50 10. Grit obtained in a grit chamber is used for: a) as a manure b) as a soil conditioner c) as a coarse aggregate d) as a substitute for sand 11 / 50 11. Turbidity is undesirable because it a) renders waters unpalatable b) affects photosynthesis of aquatic life c) causes milky unite coloration to water d) causes red and brown stains 12 / 50 12. PVC pipes can withstand pressure up to a) 20 m head of water b) 50 m head of water c) 100 m head of water d) 150 m head of water 13 / 50 13. 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 14 / 50 14. If P is the total internal pressure, d is the diameter of the pressure conduit, and t is the thickness of the conduit, the hoop's stress is a) d.p / 2t b) d.p / t c) d.t / 2p d) d.t / p 15 / 50 15. Sluice valves in main water supplies are a) used to regulate the flow b) spaced about 5 km apart c) generally provided at the summits d) all of the above 16 / 50 16. Following material is used during drilling to prevent caving a) bentonite b) thixotropy c) both (a) and (b) above d) none of the above 17 / 50 17. The water supply demand in a fully plumbed system in Nepal context a) 45 lpcd b) 65 lpcd c) 112 lpcd d) 135 lpcd 18 / 50 18. 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 19 / 50 19. Break pressure tank in a water supply system is incorporated to: a) Store water under pressure b) Treat water by adequate pressure c) Release the pressure generated in the pipe d) Break the pressure 20 / 50 20. The underground structure in the form of a circular or rectangular tank for the purpose of admitting sewerage into it from the intercepting chamber is called: a) Soak pit b) septic tank c) Cesspool d) privy pit 21 / 50 21. 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 22 / 50 22. Odour is measured in terms of... a) threshold number b) reynold number c) mach number d) none of the above 23 / 50 23. As compared to shallow tube wells, deep wells have a) more depth b) less depth c) more discharge d) less discharge 24 / 50 24. Sterilized water is generally used for a) domestic b) medical c) public d) all of the above 25 / 50 25. 2 ml of sewage, having BOD-500 mg/l, is diluted to 200 ml, and incubated for 5 days at 20°C. If the D.O. content after 5 days is found to be 5 mg/l, what was the initial D.O. content of the diluted sample? a) 10 mg/l b) 5 mg/l c) 1 mg/l d) none of the above 26 / 50 26. 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 27 / 50 27. For separate and partially separate systems, the pattern of collection suitable is: a) perpendicular pattern b) interceptor pattern c) radial pattern d) fan pattern 28 / 50 28. Goitre is due to a) chlorine b) bromine c) iodine d) all of the above 29 / 50 29. For areas of distributed rainfall throughout the year with less intensity, the suitable system of sanitation is: a) separate system b) combined system c) partially separate system d) partially combined system 30 / 50 30. The presence of hydrogen sulfide in water causes: a) softening b) acidity c) alkalinity d) bad taste 31 / 50 31. Dengue is termed as which type of disease? a) Waterborne b) Water washed c) Water based d) Water related 32 / 50 32. 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 33 / 50 33. A circular section for a sewer is preferred only up to a diameter of: a) 10 cm b) 20 cm c) 30 cm d) 60 cm 34 / 50 34. Ovoid sewers are best suited for: a) separate system b) combined system with less fluctuations c) combined system with very wide fluctuations d) outfall sewer 35 / 50 35. Most suitable section of sewer in a separate sewage system is: a) circular section b) rectangular section c) egg-shaped section d) modified egg-shaped section 36 / 50 36. 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 37 / 50 37. The capacity of Guheswari STP is: a) 15.4 Mld b) 1.1 Mld c) 0.50 Mld d) 12.1 Mld 38 / 50 38. 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 39 / 50 39. 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 40 / 50 40. 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 41 / 50 41. 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 42 / 50 42. 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 43 / 50 43. As the diameter of the sewer increases, the self-cleaning velocity: a) increases b) decreases c) remains constant d) depends on other factors 44 / 50 44. Growth of the population can be conveniently represented by a) arithmetical curve b) geographical curve c) logistic curve d) straight line curve 45 / 50 45. A sanitary sewer is expected to run: a) full b) half-full c) 2/3 full d) 90% full 46 / 50 46. The depression of the water table in a well due to pumping will be maximum a) at a distance r from the well b) at a distance r/2 from the well c) close to the well d) none of the above 47 / 50 47. Excess concentration of sodium salts in water causes a) hardness b) bitter taste c) alkalinity d) laxative effect 48 / 50 48. The valve which allows water to flow in one direction but prevents its flow in the reverse direction is a) reflux valve b) gate valve c) sluice valve d) pressure valve 49 / 50 49. A manhole of such depth that an access shaft is required in addition to the working chamber, is called.....: a) shallow manhole b) medium manhole c) deep manhole d) none of the above 50 / 50 50. 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 Please provide accurate information so we can send your Achievement Certificate by mail. 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