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. A flight sewer is provided when the gradient is: a) low b) steep c) maximum (i.e., vertical) d) zero 2 / 50 2. A structure constructed where self-cleaning velocity is not developed to prevent choking is called: a) catch basin b) flushing tank c) manhole d) inverted siphon 3 / 50 3. Clean out is provided in the underground......sewer in place of manhole. a) main sewer b) trunk sewer c) outfall sewer d) lateral sewer 4 / 50 4. Which one is a waterborne disease? a) malaria b) cancer c) dysentery d) encephalitis 5 / 50 5. The water supply system whose main, sub-main, and branches are interconnected with each other is: a) dead-end system b) grid iron system c) ring system d) radial system 6 / 50 6. 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 7 / 50 7. 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 8 / 50 8. The minimum diameter of a sewer pipe should be: a) 5 cm b) 10 cm c) 15 cm d) 25 cm 9 / 50 9. Sewage is treated by aerobic bacteria action in: a) septic tank b) settling tank c) trickling filter d) oxidation pond 10 / 50 10. Sewerage system is designed for: a) maximum flow only b) minimum flow only c) average flow only d) maximum and minimum flow 11 / 50 11. The open channels supported above the ground over trestles are called a) tunnel b) aqueduct c) flume d) conduit 12 / 50 12. 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 13 / 50 13. Highly colored waters are a) unaesthetic b) highly polluted c) require elaborate d) rich in iron and manganese. 14 / 50 14. The ratio of the maximum daily consumption to the average demand is a) 1.2 b) 1.5 c) 1.8 d) 2.7 15 / 50 15. 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 16 / 50 16. The disinfection efficiency of chlorination a) increases with the temperature of water b) decreases with the temperature of water c) not affected by temperature d) none of the above 17 / 50 17. Minimum depth of infiltration gallery is a) 2 m b) 3 m c) 4 m d) 5 m 18 / 50 18. 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 19 / 50 19. 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 20 / 50 20. The hourly variation factor is generally taken a) 1.2 b) 1.5 c) 1.8 d) 2.3 21 / 50 21. 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 22 / 50 22. The valve provided on the suction pipe in a tube-well is a) air relief valve b) reflux valve c) pressure d) sluice valve 23 / 50 23. The head developed in a centrifugal pump, at zero discharge is known as a) low head b) high head c) medium head d) shut off head 24 / 50 24. 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 25 / 50 25. Septic tanks are best suited for: a) municipalities b) industries c) scattered residences d) congested areas 26 / 50 26. A sanitary sewer is expected to run: a) full b) half-full c) 2/3 full d) 90% full 27 / 50 27. Suitable sewer section for both combined and separate systems is: a) circular section b) rectangular section c) egg-shaped section d) horse-shoe type section 28 / 50 28. Gastrointestinal irritation is produced because of excess of the following in water a) chlorides b) sulphates c) nitrates d) phosphates 29 / 50 29. 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 30 / 50 30. Drop manholes are provided on sewers in: a) hilly towns b) plain towns c) manholes are deep d) none of the above 31 / 50 31. 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 32 / 50 32. A 1 m cast iron pipe carries a discharge of 0.785 cum/sec, the velocity of flow will be a) 0.9 m/sec b) 1.0 m/sec c) 1.2 m/sec d) none of the above 33 / 50 33. In the single-stack system of plumbing, the number of vertical pipes is: a) 1 b) 2 c) 3 d) 4 34 / 50 34. 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 35 / 50 35. The types of joint not used to resist shock, vibration, etc. is a) dresser coupling joint b) victaulic joint c) flanged joint d) flexible joint 36 / 50 36. Aeration of water is done by a) spray nozzles b) cascading c) trickling bed d) all of the above 37 / 50 37. The process of obtaining energy for their (bacteria) synthesis after the oxidation of organic or inorganic matter is called a) photosynthesis b) chemosynthesis c) both d) none 38 / 50 38. The minimum water flow in a tap stand is: a) 0.25 lps b) 0.20 lps c) 0.15 lps d) 0.10 lps 39 / 50 39. The quantity of flushing water required for pour-flush water seal latrine is: a) 0.5-1.5 litres b) 1.5-2.0 litres c) 2.0-3.0 litres d) 3.0-4.0 litres 40 / 50 40. Strainer type tube wells are considered unsuitable for a) coarse gravel b) fine sand strata c) clean gravels d) all of the above 41 / 50 41. If the head of water is more than 100 m then the type of pipe used is a) plastic b) HDP c) GI d) PVC 42 / 50 42. Gravity water supply system starts from a) intake b) collection chamber c) BPT d) faucet 43 / 50 43. 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 44 / 50 44. 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 45 / 50 45. A tube well of 38cm diameter has depths before and after pumping at 10.7 m and 4.60, respectively. The coefficient of permeability is 2273 liters per day. If the radius of the circle of influence is 304.8m. The yield from the tube well will be a) 500,00 liters per day b) 600,00 liters per day c) 750,00 liters per day d) 900,00 liters per day 46 / 50 46. Designation of GI pipe is done with: a) internal diameter b) external diameter c) center line d) none of the above 47 / 50 47. 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 48 / 50 48. 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 49 / 50 49. Purest water may have a) no colour b) faint blue-green colour c) dark blue colour d) brownish-yellow colour 50 / 50 50. 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 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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