1. Which system of collection of sewage is a dry system? water carriage system incernation biological digestion conservancy system 2. What is the maximum capacity of medium screen in collecting solids? 40l 50l 90l 30l 3. Which of the following is represented b the green curve in the above figure? equilibrium concentration of oxygen reoxygenation curve oxygen sag curve deoxygenation curve 4. is the process in which ground water unfiltrate into the sewers. filtration osmosis exfiltration infiltration 5. is the process which indicates the flow of waste water from the sewer into the ground. exfiltration osmosis filtration infiltration 6. In which settling type, dilute suspension of particles takes place? discrete settling compression settling zone settling hindered settling 7. What is yellow curve represents in the following figure? reoxygenation curve equilibrium concentration of oxygen oxygen sag curve deoxygenation curve 8. Which of the following surface has a maximum Kuichlings impermeability factor? gravel road macadamized road ways water tight roof surface unpaved surface 9. The maximum deficiency of dissolved oxygen is represented by yellow curve violet curve green curve dotted blue line 10. How many types of settling are there in the sedimentation tank? 4 3 6 5 11. In preliminary treatment of sewage, the operation which takes place, is removal of lighter floating material removal of fine suspended particles removal of fine dissolved organic material removal of harmful bacterias and other organisms 12. How many types of aerators are commonly used in the treatment of wastewater? 4 3 2 5 13. Which of the following represents the oxygen sag curve in the following figure? yellow curve green curve red curve dotted blue line 14. The detention period of detritus tank is 40 seconds 3 minute 1 hour 1 minute 15. Which reactors are characterized by non- continuous reactions? continuous reactor batch reactor fluidized bed reactor plug flow reactor 16. How is mixing done in SBR? air stripping agitation by air mechanical manual 17. What is the minimum depth of water to be kept in the oxidation pond? 1.5m 0.5m 1 m 0.3m 18. What is the shape of the oxidation ditch? oval circular rectangular square 19. In which stage of the SBR is aeration performed? third fourth first second 20. The ditch is lined by layer. permeable cement impermeable brick 21. SBR is a type of activated sludge process chemical process anaerobic process aerobic process 22. The depth of the filter media of intermittent filter is 60cm 25cm 45cm 20cm 23. Which of the following process is not adopted in oxidation ditches? oxidation decomposition desorption adsorption 24. Which of the following filter is used in the anaerobic treatment of sewage? contact filter intermittent sand biological filter trickling filter 25. The disposal of sewage from the septic tank is done by which of the following? soak pit aerated lagoon clarifier lamp holes 26. In which type of settling, sedimentation of discrete particles takes place? hindered settling compression settling discrete settling zone settling 27. The organic loading in low rate trickling filter is 900 kg/hectare- meter/day. What is the efficiency of the filter? 0.883 0.431 0.83 0.0704 28. How many types of trickling filters are used in sewage treatment? 5 3 2 1 29. The maximum depth of aeration tank used in activated sludge process is 4.5m 1m 5.5m 2m 30. The color of the secondary sludge produced from the high rate trickling filter is black gray brown green 31. Which of the following device is used for the removal of oil and grease? skimming tank grit chambers flocculator tube settlers 32. Which is the third zone of pollution in the river? zone of clean water zone of active decomposition zone of degradation zone of recovery 33. The wet weather flow is also known by average rate of flow minimum sewage flow maximum sewage flow storm water flow 34. In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater? discrete settling compression settling flocculent settling hindered settling 35. Which type of reactor is used for mixing chemicals in water treatment? fixed bed reactor plug flow reactor continuous reactor batch reactor 36. is the ratio of volume of recirculated sewage to the raw sewage. bod food to mass ratio recirculation factor recirculation ratio 37. The settling velocity of spherical particle is given by hazen and william equation bernoullis equation stokes equation darcy weisbach equation 38. After how many years, night soil gives good quality manure? 5 1 14 10 39. Turbidity of water is usually measured in terms of Sodium scale Cobalt scale Platinum scale Silica scale 40. The emission of carbon monoxide in automobile exhaust will be low when the vehicle is idling cruising at high speeds cruising at low speeds accelerating 41. Temporary hardness in water in caused by salts like Chlorides Sulphates Carbonates Nitrates 42. All of the following are pesticides EXCEPT Aldrin BHC Endrin Chloroform 43. Black holes are celestial bodies which Have strong electrical field Are self luminous bodies Do not allow any light to escape outside Have strong magentic field 44. Which system of collection of sewage is called a dry system? water carriage system conservancy system incernation biological digestion 45. The atmosphere gets heated up mainly by Direct sun-rays Radiogenic heat Heat of the earth's interior Radiation from the earth's surface 46. The ratio activity of water due to Strontium can be removed by Phosphate coagulation Lime - Soda solution Lime Alum coagulation 47. The colour of water is measured In terms of degree of hardness In terms of platinum cobalt scale In ferms of pH value ppm of dissolved solids 48. The presence of fluorides in drinking water helps in Killing aerobic bacteria Preventing decaying of teeth Reduces fungi formation Purification of water 49. Which of the following plant is highly sensitive to mercury vapour? Ivy Sunflower Cherry Sarcococca 50. The presence of which of the following material in water is not considered to be dangerous? 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