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 underground structure in the form of a circular or rectangular tank for the purpose of admitting sewerage into it from the intercepting chamber is called: a) Soak pit b) septic tank c) Cesspool d) privy pit 2 / 50 2. Digesters are used for: a) the sludge digestion under optimum conditions b) the sludge digestion under normal conditions c) the sludge digestion under extreme conditions d) none of the above 3 / 50 3. 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 4 / 50 4. Coefficient of permeability is maximum for a) clean gravel b) clay c) fine sand d) silt 5 / 50 5. According to the guidelines of DWSS, the maximum number of users in each stand post should be: a) 50 b) 100 c) 150 d) 200 6 / 50 6. A lamp hole is helpful in: a) illuminating sewer line b) cleaning sewer line c) repairing d) testing sewers 7 / 50 7. The interference of the well depends upon a) the number of wells b) spacing between wells c) types of wells d) all of the above 8 / 50 8. Tuberculation is caused in a metal pipe due to a) sulphur-reducing bacteria b) nitrogen-reducing bacteria c) oxygen-reducing bacteria d) phosphorus of total water demand 9 / 50 9. Nahni trap is made of: a) mud b) cast iron c) steel d) all of the above 10 / 50 10. The type of joint generally used in cast-iron pipes is a) flanged joint b) socket and spigot joint c) dresser coupling joint d) all of the above 11 / 50 11. Pick up the correct statement: a) If PH<7 then sewage is acidic b) If PH>7 then sewage is alkaline c) If PH=7 the sewage is neutral d) all of the above 12 / 50 12. The specific gravity of sewage is: a) equal to 1 b) slightly less than 1 c) slightly more than 1 d) none of the above 13 / 50 13. 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 14 / 50 14. Purest water may have a) no colour b) faint blue-green colour c) dark blue colour d) brownish-yellow colour 15 / 50 15. The diameter of pipes in bathrooms and lavatories in domestic water supply is: a) 10 mm b) 12 mm c) 16 mm d) 20 mm 16 / 50 16. Drop manholes are provided on sewers in: a) hilly towns b) plain towns c) manholes are deep d) none of the above 17 / 50 17. It is practical to design sewer for the self-cleaning velocity at: a) Ultimate peak flow b) Maximum flow c) Minimum flow d) Extra flow 18 / 50 18. The term "septic" refers to.....? a) Anaerobic bacterial environment that develops in the tank b) Refers to safety and precaution c) Drainage of waste materials d) Aerobic bacterial environment that develops in the tank 19 / 50 19. Laying of a sewer is generally done with the help of: a) sight rails and boning rod b) theodolite and staff c) leveling and staff d) all of the above 20 / 50 20. The last trap provided in a house drainage system is: a) q-trap b) floor trap c) nahni trap d) interception trap 21 / 50 21. Aeration of water is done to a) remove carbon dioxide and taste in water b) remove taste and odour in water c) increase the quantity of oxygen in water d) all of the above 22 / 50 22. 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 23 / 50 23. 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% 24 / 50 24. 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 25 / 50 25. Slow sand filter is efficient to remove bacteria from the raw water to an extent of: a) 50% b) 70% c) 85% d) 99% 26 / 50 26. The presence of hydrogen sulfide in water causes: a) softening b) acidity c) alkalinity d) bad taste 27 / 50 27. The ratio of maximum to average sewage flow for mains up to 1 m in diameter is usually: a) 1.0 b) 1.2 c) 1.5 d) 2.0 28 / 50 28. Advantage of pressure conduits is a) flow is independent of the grade of the hydraulic grade line b) economical since it follows a shorter path c) less chance of water pollution as it is closed d) all of the above 29 / 50 29. The highest non-scouring velocity in a sewer may be allowed in: a) cast iron sewer b) glazed brick sewer c) cement concrete d) stone ware sewer 30 / 50 30. Flush air inlets are sometimes called: a) ventilated lamp holes b) well hole c) clean outs d) flushing tank 31 / 50 31. Water of zero hardness is obtained by a) boiling b) lime-soda process c) base exchange process d) none of the above 32 / 50 32. Highly colored waters are a) unaesthetic b) highly polluted c) require elaborate d) rich in iron and manganese. 33 / 50 33. The quantity of flushing water required for pour-flush water seal latrine is: a) 0.5-1.5 litres b) 1.5-2.0 litres c) 2.0-3.0 litres d) 3.0-4.0 litres 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. Turbidity can be removed by a) coagulation and filtration b) aeration and sedimentation c) activated carbon adsorption d) disinfections 36 / 50 36. The standard BOD at 20°C is taken for the consumption in: a) 20 days b) 15 days c) 10 days d) 5 days 37 / 50 37. 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 38 / 50 38. Septic tank effluent is: a) quite clear and sparkling b) always odorless c) having fine organic solids with high BOD d) black tarry liquor with an earthy odor 39 / 50 39. "Dental Caries" will be absent where the following is present a) mottled enamel of teeth b) itai-itai c) methemoglobinemia d) cancer 40 / 50 40. B-coli tests are conducted to serve as a a) very good indicator of pathogenic bacteria b) very good indicator of acidity c) very good indicator of alkalinity d) means of detecting turbidity 41 / 50 41. Rotary pumps are suited for a) small discharge b) large discharge c) high head d) none of the above 42 / 50 42. The alum, when mixed with water as a coagulant...... PH value of water. a) decreases b) increases c) no change d) none of the above 43 / 50 43. Any trap is intended to trap foul gases with the provision of: a) clear seal b) sewage or sullage c) otta seal d) water seal 44 / 50 44. Break pressure tank in a water supply system is incorporated to: a) Store water under pressure b) Treat water by adequate pressure c) Release the pressure generated in the pipe d) Break the pressure 45 / 50 45. Surface water is obtained from a) well b) spring c) artesian well d) rain 46 / 50 46. 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 47 / 50 47. Which type of distribution system will you follow if the reduced level of the source of water is 100 m while the reduced level of the town is 50 m? a) gravity system b) pumping system c) dual system d) none of the above 48 / 50 48. Turbidity for domestic water is undesirable because it a) is unaesthetic b) causes change of taste c) gives apparent colour d) none of the above 49 / 50 49. 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 50 / 50 50. Manhole is said to be deep if its depth is more than: a) 1.5 m b) 1.70 m c) 1.9 m d) 2.1 m Please provide accurate information so we can send your Achievement Certificate by mail. NameEmailPhone Number Your score is Share your achievement! 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