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. Self-purification of natural streams is caused due to a) dilution b) oxygen reduction c) sunlight d) all of the above 2 / 50 2. 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 3 / 50 3. The inlet and outlet pipes of the septic tank are bent: a) upward b) downward c) inlet upward and outlet downward d) inlet downward and outlet upward 4 / 50 4. 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 5 / 50 5. 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 6 / 50 6. Groundwater from artesian wells a) contains no suspended materials b) contains dissolved salts c) requires less treatment d) all of the above 7 / 50 7. 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 8 / 50 8. The water supply pipeline should be tested at a specified pressure for a) one hour b) two hours c) three hours d) four hours 9 / 50 9. 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 10 / 50 10. Where it is not possible to obtain self-cleansing velocities for sewers, flush are provided with the minimum available head of: a) 1-3 m b) 3-5 m c) 5-7 m d) 7-10 m 11 / 50 11. In the two-pipe system of plumbing, the number of vertical pipes is: a) 1 b) 2 c) 3 d) 4 12 / 50 12. Asbestos pipes are joined by means of a) flanged joint b) flexible joint c) simplex joint d) dresser coupling joint 13 / 50 13. If D is the diameter of the upper circular portion, the overall depth of a standard egg-shaped section, is: a) D b) 1.2D c) 1.5D d) 2D 14 / 50 14. 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 15 / 50 15. Two sewer sections laid at the same grade will be hydraulically equivalent if: a) their discharge capacity when running full is equal b) their flow velocity when running full is equal c) their flowing areas when running full are equal d) all the above factors are equal 16 / 50 16. Computation of discharges is difficult for: a) dead-end system b) grid iron system c) ring system d) radial system 17 / 50 17. 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 18 / 50 18. Non-scouring velocity in concrete sewer is caused by: a) 2.5 to 3.0 m/sec b) 2.5 to 3.5 m/sec c) 1.5 to 2.5 m/sec d) 0.6 to 1.2 m/sec 19 / 50 19. Lead in water causes a) plumbo solvency b) stains on clothes and paper c) damages water systems d) permanent bluish skin 20 / 50 20. The maximum diameter of a sewer pipe should preferably be: a) 100 cm b) 200 cm c) 300 cm d) 450 cm 21 / 50 21. 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 22 / 50 22. Minimum required residual head at the public tap stand is not less than a) 15 b) 10 c) 5 d) 20 23 / 50 23. Pump efficiency is 85%, motor efficiency is 94% then the combined efficiency of the two is a) 90% b) 80% c) 70% d) 85% 24 / 50 24. Gravity conduits are generally in the form of a) open channels b) conduits c) tunnels d) all of the above 25 / 50 25. 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 26 / 50 26. Steel pipes are a) generally laid underground and no expansion joint is required b) connected by riveted or welded joints c) suitable for withstanding high internal pressure d) all of the above 27 / 50 27. 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 28 / 50 28. The valve provided at low points of the pipe to drain off water quickly under gravity is a) drain valve b) blow-off valve c) sewer valve d) all of the above 29 / 50 29. Which traps have curved legs? a) P-Trap b) Q-Trap c) gully trap d) S-Trap 30 / 50 30. If p is the population of a place in thousands then the fire demand of water in liters per minute, according to Kuichling formula, is given by a) 5663 √p b) 3182 √p c) 4640 √p d) none of the above 31 / 50 31. 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 32 / 50 32. If 10 ml of raw sewage is diluted to 250 ml, the dilution factor is: a) 24 b) 25 c) 1/25 d) none of the above 33 / 50 33. Poppet valve is a type of a) air valve b) blow-off valve c) sluice valve d) none of the above 34 / 50 34. A perched aquifer generally occurs a) in an aquiclude b) in an artesian aquifer c) above the water table d) below the water table 35 / 50 35. Shrouding is the process of filling gravel, bajri, etc., in a) slotted tube well b) strainer tube well c) perforated tube well d) cavity tube well 36 / 50 36. GI pipe coming from both sides is joined with a fitting called: a) Tee b) Union c) Elbow d) Socket 37 / 50 37. 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 38 / 50 38. The design discharge for the combined system shall be taken equal to: a) rainfall b) rainfall + dry weather flow c) rainfall + 2× dry weather flow d) rainfall + 4× dry weather flow 39 / 50 39. Inverted siphon is called: a) special sewer b) general sewer c) storm sewer d) none of the above 40 / 50 40. 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 41 / 50 41. 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 42 / 50 42. 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 43 / 50 43. Iron and manganese are estimated by a) jar test b) winkler test c) calorimetric test d) none of the above 44 / 50 44. Choose the odd statement: a) sewage is received in a wet well b) sewage is received in a dry well c) both of the above d) none of the above 45 / 50 45. True colour of water is due to a) suspended solids b) colloidal solids c) volatile solids d) acids in solution 46 / 50 46. 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 47 / 50 47. Clean out is provided in the underground......sewer in place of manhole. a) main sewer b) trunk sewer c) outfall sewer d) lateral sewer 48 / 50 48. Decrease in per capita consumption occurs by a) use of a metering system b) hot climate c) good-quality water is supplied d) all of the above 49 / 50 49. Turbidity is measured on.......... a) standard silica scale b) standard cobalt scale c) diagonal scale d) none of the above 50 / 50 50. 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 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. 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