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: 30 Time Allotted: 30 minutes Passing Score: 50% Randomization: Yes Certificate: No Do not refresh the page! 👍 All the best! 1 / 30 1. The gradient to be provided for sewers depends upon: a) the diameter of the sewer b) the discharge c) sewer pipe material d) all of the above 2 / 30 2. The object of cowl is to: a) give an ornamental look b) prevent the entry of rainfall into the waste pipe c) quickly dispel foul gases d) prevent nest building 3 / 30 3. 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 4 / 30 4. 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 5 / 30 5. Clean out is provided in the underground......sewer in place of manhole. a) main sewer b) trunk sewer c) outfall sewer d) lateral sewer 6 / 30 6. Abbreviation which is correct? a) TOC (Total Organic Carbon) b) ThOD (Theoretical Oxygen Demand) c) TOD (Total Oxygen Demand) d) all of the above 7 / 30 7. 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 8 / 30 8. 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 9 / 30 9. The working conditions in imhoff tanks are: a) aerobic only b) anaerobic only c) aerobic in the lower and anaerobic in the upper compartment d) anaerobic in the lower and aerobic in the upper compartment 10 / 30 10. Sewerage system is designed for: a) maximum flow only b) minimum flow only c) average flow only d) maximum and minimum flow 11 / 30 11. 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 12 / 30 12. Lead in water causes a) plumbo solvency b) stains on clothes and paper c) damages water systems d) permanent bluish skin 13 / 30 13. The color of septic sewage is: a) grey b) black c) white d) blue 14 / 30 14. 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 15 / 30 15. 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 16 / 30 16. Excess concentration of magnesium salts in water causes a) hardness b) bitter taste c) alkalinity d) laxative effect 17 / 30 17. 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 18 / 30 18. Salvaging is: a) extraction of essence from waste b) dumping of solid waste c) sanitary land filling of solid waste d) none of the above 19 / 30 19. The presence of hydrogen sulfide in water causes: a) softening b) acidity c) alkalinity d) bad taste 20 / 30 20. Size of colloidal particles present in water is a) 10 to 10^-1 mm b) 10^-1 to 10^-3 mm c) 10^-3 to 10^-6 mm d) 10^-6 to 10^-9 mm 21 / 30 21. The layout of the distribution system that is suitable for haphazardly growing cities is: a) dead-end system b) grid iron system c) ring system d) radial system 22 / 30 22. 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 23 / 30 23. Iron in water causes a) stains on clothes b) eutrophication c) rust d) corrosion 24 / 30 24. A manhole is generally provided at each: a) bend b) junction c) change of gradient d) change of sewer diameter 25 / 30 25. Total quantity of reservoir is the sum of the following a) breakdown reserve b) fire reserve c) all of the above d) balancing reserve 26 / 30 26. The factor to be considered for the source of water supply is: a) quantity and quality of available water b) elevation of the sources of water c) general terrain intervening the area d) all of the above 27 / 30 27. For an insignificant effect on the water table, the tube wells are spaced as one in every a) 0.5 sq km b) 1.0 sq km c) 1.5 sq km d) 2.0 sq km 28 / 30 28. The coverage of water supply in Nepal as per the census of 2011 is a) 90% b) 75% c) 85% d) 70% 29 / 30 29. A G.I. pipe has a coating of a) zinc b) lead c) silver d) aluminum 30 / 30 30. 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 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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