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. 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 2 / 50 2. The color of septic sewage is: a) grey b) black c) white d) blue 3 / 50 3. "Dental Caries" will be absent where the following is present a) mottled enamel of teeth b) itai-itai c) methemoglobinemia d) cancer 4 / 50 4. Velocity of flow through a grit chamber is: a) 30 to 60 cm/sec b) 30 to 60 cm/min c) 15 to 45 cm/sec d) 15 to 45 cm/min 5 / 50 5. Which metal is good for keeping drinking water? a) copper b) brass c) zinc d) iron 6 / 50 6. Asbestos pipes are a) highly resistant to corrosion b) light in weight and easy to transport c) highly flexible to resist deflection up to 120 d) very smooth 7 / 50 7. The minimum diameter of a sewer pipe should be: a) 5 cm b) 10 cm c) 15 cm d) 25 cm 8 / 50 8. Infiltration gallery is a a) horizontal well b) vertical well c) inclined well d) none of the above 9 / 50 9. The sewer pipes: a) carry sewage as gravity conduits b) should resist the wear and tear caused due to abrasion c) are designed for generating self-cleaning velocities at different discharge d) all of the above 10 / 50 10. The devices installed for drawing water from the sources are called a) filters b) intakes c) aquifers d) none of the above 11 / 50 11. 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 12 / 50 12. The most dangerous metal for human health is a) zinc b) copper c) lead d) iron 13 / 50 13. Highly colored waters are a) unaesthetic b) highly polluted c) require elaborate d) rich in iron and manganese. 14 / 50 14. Sewage is treated by aerobic bacteria action in: a) septic tank b) settling tank c) trickling filter d) oxidation pond 15 / 50 15. As compared to shallow tube wells, deep wells have a) more depth b) less depth c) more discharge d) less discharge 16 / 50 16. The most suitable excreta disposal unit for human excreta is: a) Privy pit b) Cesspool c) Soak pit d) None of the above 17 / 50 17. 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 18 / 50 18. 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 19 / 50 19. 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 20 / 50 20. Which one is a waterborne disease? a) malaria b) cancer c) dysentery d) encephalitis 21 / 50 21. Factors considered in the selection of the site for the intake point are that it should be a) nearer to the treatment plant b) in the pure zone of the water source c) upstream of the point of disposal of wastewater d) all of the above 22 / 50 22. Physical characteristics of sewage include: a) Turbidity b) Color c) Odor d) All of the above 23 / 50 23. The location of a well is considered good if it is sunk into a) coarse gravel b) silt c) sand d) clay 24 / 50 24. Water to the consumers may be supplied from a) rainy wells sunk to the water level b) infiltration well dug out on the banks of rivers c) infiltration galleries connected to a sump well d) all of the above 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. 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 27 / 50 27. The pipe used to carry discharge from sanitary fittings like bathrooms, kitchens, etc., is: a) waste pipe b) soil pipe c) vent pipe d) anti-siphonage pipe 28 / 50 28. 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 29 / 50 29. The peak water consumption hours as recommended by the Department of Water Supply and Sewerage (DWSS) is.... hours. a) 5.00-7.00 b) 7.00-12.00 c) 12.00-17.00 d) 17.00-19.00 30 / 50 30. The pressure at the inlet and outlet in a break pressure tank is a) zero and 1 m b) 1 m and zero c) zero and zero d) 1 m and 1 m 31 / 50 31. Sewer which gets discharge from two or more main sewers is called: a) main sewer b) trunk sewer c) combined sewer d) intercepting sewer 32 / 50 32. Source of water in the mountains is: a) tube well b) well c) stream d) none of the above 33 / 50 33. At the socket and spigot joint, a) the enlarged end of the pipe is called a socket b) the normal end of the pipe is called a spigot c) the spigot is fitted into the socket d) all of the above 34 / 50 34. 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 35 / 50 35. A septic tank is a watertight tank where the following operation(s) take place: a) sedimentation b) sedimentation + digestion (anaerobic) c) digestion (aerobic) d) decomposition of organic and inorganic matter by bacteria 36 / 50 36. The pipe joint commonly used in a pumping station is a) flexible joint b) expansion joint c) flanged joint d) socket and spigot joint 37 / 50 37. Widely used pipe for rural water supply in Nepal is: a) HDPE pipes b) GI pipes c) PVC pipes d) CI pipes 38 / 50 38. 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 39 / 50 39. The bacteria which can survive with or without oxygen is known as... a) aerobic bacteria b) anaerobic bacteria c) facultative bacteria d) none of the above 40 / 50 40. If you have to design a simple water filtration unit for a community water supply system in Biratnagar, which type of filter will you choose in general? a) slow sand filter b) rapid sand filter c) trickling filter d) pressure filter 41 / 50 41. Selection of material for the pipe depends on a) carrying capacity of the pipe b) durability and life of the pipe c) effect of water to be conveyed on the pipe material d) all of the above 42 / 50 42. 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 43 / 50 43. In the partially ventilated single-stack system of plumbing, the number of vertical pipes is: a) 1 b) 2 c) 3 d) 4 44 / 50 44. The velocity of water in water mains of 40 cm diameter is usually kept a) below 0.5 m/sec b) below 5 m/sec c) below 1.8 m/sec d) below 18 m/sec 45 / 50 45. 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 46 / 50 46. 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 47 / 50 47. 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 48 / 50 48. The standard BOD at 20°C is taken for the consumption in: a) 20 days b) 15 days c) 10 days d) 5 days 49 / 50 49. Gastrointestinal irritation is produced because of excess of the following in water a) chlorides b) sulphates c) nitrates d) phosphates 50 / 50 50. Iron in water causes a) stains on clothes b) eutrophication c) rust d) corrosion 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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