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 fresh, 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 most dangerous metal for human health is a) zinc b) copper c) lead d) iron 2 / 50 2. Turbidity of water is measured in a) mg/1 b) Nephelometric Turbidity Unit (NTU) c) potassium chloroplatinate units d) threshold number 3 / 50 3. Surface water is obtained from a) well b) spring c) artesian well d) rain 4 / 50 4. Abbreviation which is correct? a) TOC (Total Organic Carbon) b) ThOD (Theoretical Oxygen Demand) c) TOD (Total Oxygen Demand) d) all of the above 5 / 50 5. The main function of a manhole is: a) cleaning of sewer b) inspection of sewer c) joining different types of sewer d) joining different grade of sewer 6 / 50 6. Baffle wall in septic tank is: a) Short side wall b) Long side wall c) Honeycomb inner wall d) None of the above 7 / 50 7. Purest water may have a) no colour b) faint blue-green colour c) dark blue colour d) brownish-yellow colour 8 / 50 8. Sterilized water is generally used for a) domestic b) medical c) public d) all of the above 9 / 50 9. Turbidity depends on the presence of the following in water a) suspended solids b) suspended solids and colloidal solids c) any material capable of preventing light d) intensity of coloration 10 / 50 10. 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 11 / 50 11. 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 12 / 50 12. 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 13 / 50 13. 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 14 / 50 14. The location of a well is considered good if it is sunk into a) coarse gravel b) silt c) sand d) clay 15 / 50 15. Poppet valve is a type of a) air valve b) blow-off valve c) sluice valve d) none of the above 16 / 50 16. 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 17 / 50 17. Flush air inlets are sometimes called: a) ventilated lamp holes b) well hole c) clean outs d) flushing tank 18 / 50 18. 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 19 / 50 19. 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 20 / 50 20. The most suitable excreta disposal unit for human excreta is: a) Privy pit b) Cesspool c) Soak pit d) None of the above 21 / 50 21. The hourly variation factor is generally taken a) 1.2 b) 1.5 c) 1.8 d) 2.3 22 / 50 22. As per Buston's formula, fire demand for in liters per minute for a population of p in thousands, is given by a) 5663 √p b) 3182 √p c) 4640 √p d) none of the above 23 / 50 23. The water collected for the sample from the a) 10-20 cm below from the surface b) 20-30 cm below from the surface c) 30-40 cm below from the surface d) 40-50 cm below from the surface 24 / 50 24. The sewage in an inverted siphon will flow under what condition? a) Air b) Vacuum c) Pressure d) Gravity 25 / 50 25. The pattern of sanitation most suitable for a sloppy area is: a) zone pattern b) fan pattern c) radial pattern d) perpendicular pattern 26 / 50 26. A water supply system is said to be continuous when it is supplied for: a) 6 hrs b) 12 hrs c) 18 hrs d) 24 hrs 27 / 50 27. Iron in water causes a) stains on clothes b) eutrophication c) rust d) corrosion 28 / 50 28. The ratio of maximum hourly consumption and average hourly consumption of the maximum day is a) 1.2 b) 1.5 c) 1.8 d) 2.7 29 / 50 29. The velocity of flow does not depend on: a) grade of sewer b) hydraulic mean depth of sewer c) roughness of sewer d) length of sewer 30 / 50 30. Sewer preferred for a combined system of sewage is: a) rectangular sewer b) circular sewer c) egg-shaped sewer d) all of the above 31 / 50 31. 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 32 / 50 32. The characteristics of fresh and septic sewage are: a) alkaline and acidic b) acidic and alkaline c) acidic and acidic d) alkaline and alkaline 33 / 50 33. The main pipes must be designed to carry a) 3 times the average demand b) 4 times the average demand c) 1 times the average demand d) 2 times the average demand 34 / 50 34. 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 35 / 50 35. 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 36 / 50 36. The best sewer material to resist hydrogen sulfide corrosion is: a) RCC b) brick masonry c) glazed stoneware d) asbestos cement 37 / 50 37. HGL should always be...... above the GL a) 5 m b) 10 m c) 15 m d) 20 m 38 / 50 38. The common pipe used in house plumbing is: a) PVC b) HDPE c) GI d) CI 39 / 50 39. Most commonly used section in the grade aqueduct is a) circular b) rectangular c) parabolic d) all of the above 40 / 50 40. A complete water supply system includes: a) construction of intake and collection chamber b) digging of a well for water c) construction of a dam for a reservoir d) the entire arrangement from source to distribution 41 / 50 41. A sewer that collects sewage from toilets is called: a) lateral sewer b) branch sewer c) main sewer d) outfall sewer 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 to prevent a) the increase of pressure after a certain limit b) back flow when the pump is stopped c) the water flowing out of the suction pipe d) none of the above 44 / 50 44. 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 45 / 50 45. The flow in the sewers is minimum during which hours? a) Night b) Morning c) Day d) Evening 46 / 50 46. What will happen if an induction motor pump is run under significantly low voltage continually? a) Less water is pumped b) High energy will be consumed, increasing the energy bill c) The motor will make loud noise d) The motor will ultimately burn-out 47 / 50 47. Pipes for water supply are tested for a) pressure b) leakage c) dimensions d) all of the above 48 / 50 48. Normally the shape of the demand line is a) straight b) curved c) both of the above d) none of the above 49 / 50 49. 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 50 / 50 50. R.M.O. means a) running b) maintenance c) operation 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. Send feedback Buy Water Supply & Sanitation Engineering MCQ PDF for Offline Study
