1. The presence of iron sodium fluoride manganese calcium carbonate 2. The presence of calcium and magnesium chloride in water causes turbidity softening bad taste hardness 3. Low turbidity of water can be determined by Hellipe turbidimeter Baylis turbidimeter turbidity tube Jacksons turbidimeter 4. Odours and tastes may result due to the prsence of dissolved gases such as oxygen, carbon dioxide, methane etc. micro-organisms either dead or alive mineral substances such as sodium chloride, iron compounds etc. all of the options 5. The maximum permissible chlorine content for public supplies should be between 0.3 to 0.4 ppm 0.1 to 0.2 ppm 1.2 to 4 ppm 6.5 to 8 ppm 6. The continuous flow of water may be expected from artesian springs surface springs gravity springs all of the options 7. The lower portion of a manhole is is known as cover working chamber base access shaft 8. The length of rectangular sedimentation tank should not be more than six times four times three times twice 9. A pipe sunk into the ground to tap the underground water is called artesian well infiltration well tube well open well 10. Which of the following statement is correct? The sub-surface sources are not affected by draught. Infiltration galleries are most suitable for increasing the surface source supply, in dry season. The rate at which water percolates into well under safe maximum critical depression head is called yield of well. all of the options 11. A pipe installed for ventilation purpose is called vent pipe waste pipe anti-siphonage pipe soil pipe 12. High turbidity of water can be determined by Baylis turbidimeter Hellipe turbidimeter turbidity tube Jacksons turbidimeter 13. Bleaching powder is hypo-chloride of lime hypo-chlorite of lime slaked lime chloride of lime 14. The efficiency of sedimentation tank for a given discharge, can be increased by increasing the depth of tank increasing the surface area of tank decreasing the depth of tank decreasing the surface area of tank 15. Which of the following statement is wrong? There is no smell or sight nuisance in the case of water carriage system. The sewers in the water carriage system being all underground do not impair the beauty of the place The water carriage system is more hygienic. The initial cost of construction of water carriage system is very low. 16. The odour of water can be determined by Osmoscope thermometer Jacksons turbidimeter None of the options 17. To prevent the formation of crystalline hydrates of Ice of chlorine, the chlorine supply cylinders are kept at a temperature from 38° to 42° 20° to 27° 10° to 20° 27° to 37° 18. The portion of soil through which lateral movement of water takes place is called an aquiclude water tablean aquiclude zone of saturation None of the options 19. Garbage is a semi-liquid waste dry waste liquid waste None of the options 20. The turbidity in water is caused due to silt clay finely divided organic matter all of the options 21. Sphere shaped bacterias are called trichobacteria cocci spirilla bacilli 22. The maximum permissible quantity of lead in water for domestic supplies is 1 ppm 0.50 ppm 0.01 ppm 0.05 ppm 23. The lime soda process of water softening requires less quantity of coagulant helps in kolling pathogenic bacterias is suitable for turbid and acidic water all of the options 24. Grit should be removed from sewage before settling of sewage in sedimentation tank their lifting by means of pump etc. their disposal in dilution water all of the options 25. The amount of residual chlorine in treated water is determined by the Iodemetric test Amperometric test Orthotolodine test all of the options 26. Manholes on sewer lines are provided for periodic cleaning providing air for oxidation removal of part of sewerage all of the options 27. Land disposal of sewage will be favourable where rainfall is very high the rivers run dry or have a small flow during summer climate is wet and rates of evaporation is low all of the options 28. The most important source of water for public water supply is river lake sea pond 29. The void spaces in the filtering material act like a drain inlet outlet tiny settling basins 30. In the process of screening, the screens should be inclined at an angle of 10° to 20° 70° to 85° 30° to 40° 45° to 60° 31. The most common cause of acidity in water is hydrogen oxygen carbon dioxide all of the options 32. The most commonly used chemical for dechlorination of water is potassium permaganate sodium thiosulphate sodium sulphite all of the options 33. When in the pervious strata, the surface of water surrounding the well is at atmospheric pressure, the well is known as artesian well open well gravity well deep well 34. A septic tank is a combination of sedimentation and digestion tank sedimentation tank digestion tank aeration tank 35. The bacteria which require oxygen for their survival is known as anaerobic bacteria non-pathogenic bacteria aerobic bacteria pathogenic bacteria 36. The ideal method of disinfection of swimming pool water is by lime treatment ultra-violet rays chlorination ozonisation 37. The amount of oxygen consumed by sewage from an oxidising agent like potassium dichromate is termd as bio-chemical oxygen demand (B.O.D.) relative stability chemical oxygen demand (C.O.D.) None of the options 38. For a city or town with roads of rectangular pattern, the type of layout used for the distribution of pipes is grid iron system dead end system radial system ring system 39. The open wells or dug wells are also known as percolation wells draw wells shallow wells all of the options 40. The prsence of sodium chloride in water softens the water stops epidemic increases hardness of water causes bad taste 41. The equipment used for cleaning the sewers easily is called scoop scraper gouge claw 42. The process of removing excess chlorine from water is called plain chlorination post-chlorination dechlorination super-chlorination 43. Grit chambers of a sewage plant are usually changed after 1 week 1 day 4 weeks 2 weeks 44. The type of joint to be used in pipes depends upon the internal pressure conditions of support material of pipe all of the options 45. In dry feeding type of coagulants, the dose of coagulant is controlled by scrapers paddles worm wheel None of the options 46. A sewer which receives storm water, surface run-off and sewage is called a branch sewer common sewer combined sewer outfall sewer 47. The coefficient of uniformity for slow sand filters is 1.35 1.55 2.05 1.75 48. A scour valve, in a water distribution system, is provided at high points junction points low points all of the options 49. A separate system will be favourable when the finances are limited the sewers are to be laid in rocks the topography is flat necessitating deep excavation for combined sewers all of the options 50. 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