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: 30 Time Allotted: 30 minutes Passing Score: 50% Randomization: Yes Certificate: No Do not refresh the page! 👍 All the best! 1 / 30 1. The slope of the hydraulic grade line is always towards the well due to pumping. This line of depressed water table is called a) drawdown curve b) circle of influence c) dynamic gradient d) an inverted cone of depression 2 / 30 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 / 30 3. The sewer meant to carry excess discharge from an existing sewer is called: a) main sewer b) trunk sewer c) outfall sewer d) relief sewer 4 / 30 4. In an egg-shaped sewer section, the maximum discharge occurs when the depth of flow is: (where d is the total depth of the section) a) 0.25d b) 0.50d c) 0.75d d) 0.95d 5 / 30 5. Pump efficiency is 85%, motor efficiency is 94% then the combined efficiency of the two is a) 90% b) 80% c) 70% d) 85% 6 / 30 6. The type of joint used in joining the plain ends of cast-iron pipes is a) flanged joint b) flexible joint c) dresser coupling joint d) socket and spigot joint 7 / 30 7. 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 8 / 30 8. Kidney damage may be caused due to excess concentration of a) fluorides b) nitrates c) chlorides d) nitrites 9 / 30 9. Most common sources of water in hill and terai in our country are...respectively. a) surface and ground b) ground and surface c) surface and surface d) ground and ground 10 / 30 10. 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 11 / 30 11. The average discharge of a tube-well is about a) 5 liters/sec b) 50 liters/sec c) 100 liters/sec d) 500 liters/sec 12 / 30 12. 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 13 / 30 13. To compensate for losses, thefts, and wastage of water, an allowance made of (as per NWSC) a) 5% b) 10% c) 15% d) 35% 14 / 30 14. 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% 15 / 30 15. Inverted siphon is called: a) depressed sewer b) sag sewer c) both of the above d) none of the above 16 / 30 16. Gravity water supply system starts from a) intake b) collection chamber c) BPT d) faucet 17 / 30 17. "A right-angled sleeve (valve) connected in the water main through which water is tapped for domestic supply is called: a) service pipe b) goose neck c) ferrule d) stop tap 18 / 30 18. 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 19 / 30 19. Mass action' during sedimentation is the property of: a) decrease in mass of sludge b) settling of a particle along with the neighboring particle c) quick spreading of floc d) increase in mass of sludge 20 / 30 20. Aqueducts are generally not designed in a) circular section b) rectangular section c) horse-shoe section d) vee section 21 / 30 21. 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 22 / 30 22. "Dental Caries" will be absent where the following is present a) mottled enamel of teeth b) itai-itai c) methemoglobinemia d) cancer 23 / 30 23. Abyssinian tube well is a special type of a) strainer type tube well b) cavity type tube well c) slotted type tube well d) perforated type tube well 24 / 30 24. 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 25 / 30 25. The standard BOD at 20°C is taken for the consumption in: a) 20 days b) 15 days c) 10 days d) 5 days 26 / 30 26. Source of water in the mountains is: a) tube well b) well c) stream d) none of the above 27 / 30 27. The aquifer having the least water-bearing capacity is a) confined b) unconfined c) perched d) none of the above 28 / 30 28. 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 29 / 30 29. 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 30 / 30 30. In the one-pipe system of plumbing, the number of vertical pipes is: a) 1 b) 2 c) 3 d) 4 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