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1. |
Which system of collection of sewage is a dry system? |
A. | conservancy system |
B. | biological digestion |
C. | incernation |
D. | water carriage system |
Answer» A. conservancy system |
2. |
After how many years, night soil gives good quality manure? |
A. | 1 |
B. | 5 |
C. | 10 |
D. | 14 |
Answer» A. 1 |
3. |
Conservancy system is a highly unhygienic system, causing insanitary conditions. |
A. | true |
B. | false |
Answer» A. true |
4. |
Which of the following is not correct regarding conservancy system? |
A. | high maintenance cost |
B. | highly unhygienic system |
C. | independent of labour |
D. | chances of epidemic |
Answer» C. independent of labour |
5. |
Which system of collection of sewage is called a dry system? |
A. | conservancy system |
B. | biological digestion |
C. | incernation |
D. | water carriage system |
Answer» A. conservancy system |
6. |
is a method where water is used as a medium for the flow of sewage from its production of the treatment unit. |
A. | conservancy system |
B. | biological digestion |
C. | incernation |
D. | water carriage system |
Answer» D. water carriage system |
7. |
The water carriage system is a hygienic system without any bad smell. |
A. | true |
B. | false |
Answer» A. true |
8. |
Which of the following is correct regarding water carriage system? |
A. | chances of the epidemic is there |
B. | foul smell is produced |
C. | does not cause pollution |
D. | highly dependent on labours |
Answer» C. does not cause pollution |
9. |
Which of the following is an advantage of a separate water carriage system? |
A. | get choked easily |
B. | difficult to clean the sewer |
C. | two sets of sewer are used |
D. | the more uniform character of sewage |
Answer» D. the more uniform character of sewage |
10. |
Which of the following is a disadvantage of a separate water carriage system? |
A. | low installation charge |
B. | no loads on treatment units |
C. | lesser air contact with small sized sewer |
D. | provision of the automatic flushing tank is not required |
Answer» C. lesser air contact with small sized sewer |
11. |
provides only one sewer to carry both foul sewage and rainwater. |
A. | separate water carriage system |
B. | combined water carriage system |
C. | partially combined water carriage system |
D. | conservancy system |
Answer» B. combined water carriage system |
12. |
Which of the following is an advantage of the combined water carriage system? |
A. | there is more air in large sewer |
B. | there is the inclusion of storm water |
C. | there is difficulties in ventilation of large sewer |
D. | overflowing of sewer |
Answer» A. there is more air in large sewer |
13. |
Which of the following is incorrect regarding partially combined water carriage system? |
A. | the sewers are of reasonable size |
B. | there is choking of sewer |
C. | the storm water increases load on treatment units |
D. | the storm water increases the cost of pumping |
Answer» B. there is choking of sewer |
14. |
The choice of combined water carriage system does not depend on |
A. | space consideration |
B. | even rainfall pattern |
C. | steep topography |
D. | pumping requirements |
Answer» C. steep topography |
15. |
is the flow through sewers available during non-rainfall period. |
A. | gradually varied flow |
B. | rapidly varied flow |
C. | dry weather flow |
D. | storm water flow |
Answer» C. dry weather flow |
16. |
is the additional flow occurring during rainy season. |
A. | gradually varied flow |
B. | rapidly varied flow |
C. | dry weather flow |
D. | storm water flow |
Answer» D. storm water flow |
17. |
Which flow is also called as sanitary sewage? |
A. | dry weather flow |
B. | storm weather flow |
C. | uniform flow |
D. | non uniform flow |
Answer» A. dry weather flow |
18. |
Which of the following factor does not effect the dry weather flow? |
A. | rate of water supply |
B. | temperature conditions |
C. | population growth |
D. | infiltration of ground water |
Answer» B. temperature conditions |
19. |
The sewer should be designed for a minimum of litres of waste water per capita per day. |
A. | 50 |
B. | 100 |
C. | 150 |
D. | 1000 |
Answer» C. 150 |
20. |
is the process in which ground water unfiltrate into the sewers. |
A. | exfiltration |
B. | infiltration |
C. | filtration |
D. | osmosis |
Answer» B. infiltration |
21. |
is the process which indicates the flow of waste water from the sewer into the ground. |
A. | exfiltration |
B. | infiltration |
C. | filtration |
D. | osmosis |
Answer» A. exfiltration |
22. |
The peaking factor is defined by |
A. | peak flow * average flow |
B. | peak flow – average flow |
C. | peak flow + average flow |
D. | peak flow / average flow |
Answer» D. peak flow / average flow |
23. |
The peaking factor is directly proportional to the population of the city. |
A. | true |
B. | false |
Answer» B. false |
24. |
The wet weather flow is also known by |
A. | minimum sewage flow |
B. | maximum sewage flow |
C. | storm water flow |
D. | average rate of flow |
Answer» C. storm water flow |
25. |
Which of the following surface has a maximum Kuichling’s impermeability factor? |
A. | gravel road |
B. | water tight roof surface |
C. | unpaved surface |
D. | macadamized road ways |
Answer» B. water tight roof surface |
26. |
The expression of the Chezy’s formula is given by |
A. | v = c/rs |
B. | v = crs2 |
C. | v = c (rs)1/2 |
D. | v = c/ (rs)1/2 |
Answer» C. v = c (rs)1/2 |
27. |
Which of the following is the expression of the Manning’s formula? |
A. | $$$V = R^{1/2}S^{1/2}/N$$$ |
B. | $$$V = R^{2/3}S^{2}/N$$$ |
C. | $$$V = R^{2/3}S^{1/2}/N$$$ |
D. | $$$V = R^{2/3}S^{1/2}$$$ |
Answer» C. $$$V = R^{2/3}S^{1/2}/N$$$ |
28. |
is the velocity at which the solid matter in sewage remained in suspended form. |
A. | settling velocity |
B. | self cleansing velocity |
C. | mean velocity |
D. | non scouring velocity |
Answer» B. self cleansing velocity |
29. |
Primary treatment of sewage consists of removal of |
A. | large suspended organic solids |
B. | oil and grease |
C. | sandand grit |
D. | floating materials |
Answer» A. large suspended organic solids |
30. |
The most widely used pumps for sewage lifting is |
A. | centrifugal pummp |
B. | reciprocating pump |
C. | pneumatic ejector |
D. | air pressure pump |
Answer» A. centrifugal pummp |
31. |
Drop man holes are generally provided in sewers for |
A. | industrial reas |
B. | large township |
C. | hilly townships |
D. | cities in plains |
Answer» C. hilly townships |
32. |
The pollution zones in the river are divided into how many types? |
A. | 3 |
B. | 4 |
C. | 6 |
D. | 8 |
Answer» B. 4 |
33. |
In which pollution zone of the river, growth of algae reappear? |
A. | zone of degradation |
B. | zone of recovery |
C. | zone of active decomposition |
D. | zone of clean water |
Answer» B. zone of recovery |
34. |
In which pollution zone of the river, the dissolved oxygen reduced to 0? |
A. | zone of degradation |
B. | zone of recovery |
C. | zone of clean water |
D. | zone of active decomposition |
Answer» D. zone of active decomposition |
35. |
Which is the third zone of pollution in the river? |
A. | zone of recovery |
B. | zone of degradation |
C. | zone of clean water |
D. | zone of active decomposition |
Answer» A. zone of recovery |
36. |
What is yellow curve represents in the following figure? |
A. | deoxygenation curve |
B. | reoxygenation curve |
C. | oxygen sag curve |
D. | equilibrium concentration of oxygen |
Answer» A. deoxygenation curve |
37. |
Which of the following is represented b the green curve in the above figure? |
A. | deoxygenation curve |
B. | reoxygenation curve |
C. | oxygen sag curve |
D. | equilibrium concentration of oxygen |
Answer» B. reoxygenation curve |
38. |
The maximum deficiency of dissolved oxygen is represented by |
A. | dotted blue line |
B. | green curve |
C. | yellow curve |
D. | violet curve |
Answer» A. dotted blue line |
39. |
Which of the following represents the oxygen sag curve in the following figure? |
A. | dotted blue line |
B. | green curve |
C. | yellow curve |
D. | red curve |
Answer» D. red curve |
40. |
The reoxygenation constant at temperature ‘T’ is expressed by |
A. | krt = kr20 (1.016)t |
B. | krt = kr20 (1.047) t-20 |
C. | krt = kr20 (1.016)t-20 |
D. | krt = kr20 (1.047)t |
Answer» C. krt = kr20 (1.016)t-20 |
41. |
The minimum spacing between the bars on fine screen is |
A. | 0.3mm |
B. | 0.9mm |
C. | 1.5mm |
D. | 0.5mm |
Answer» C. 1.5mm |
42. |
The spacing between the bars in racks is |
A. | 30mm |
B. | 50mm |
C. | 70mm |
D. | 90mm |
Answer» B. 50mm |
43. |
Screens are inclined to the direction of flow to |
A. | increase the flow velocity |
B. | increase the opening area |
C. | decrease the flow velocity |
D. | increase the head loss |
Answer» C. decrease the flow velocity |
44. |
The maximum spacing between the bars in medium screen is |
A. | 40mm |
B. | 50mm |
C. | 70mm |
D. | 90mm |
Answer» A. 40mm |
45. |
What is the maximum capacity of medium screen in collecting solids? |
A. | 30l |
B. | 40l |
C. | 50l |
D. | 90l |
Answer» D. 90l |
46. |
The design velocity of flow of a detritus tank is |
A. | 1m/sec |
B. | 1.2m/sec |
C. | 0.9m/sec |
D. | 0.5m/sec |
Answer» C. 0.9m/sec |
47. |
Which of the following device is used for the removal of oil and grease? |
A. | skimming tank |
B. | grit chambers |
C. | tube settlers |
D. | flocculator |
Answer» A. skimming tank |
48. |
How many types of settling are there in the sedimentation tank? |
A. | 3 |
B. | 4 |
C. | 5 |
D. | 6 |
Answer» B. 4 |
49. |
In which type of settling, sedimentation of discrete particles takes place? |
A. | zone settling |
B. | compression settling |
C. | hindered settling |
D. | discrete settling |
Answer» D. discrete settling |
50. |
The settling velocity of spherical particle is given by |
A. | darcy weisbach equation |
B. | hazen and william equation |
C. | stokes equation |
D. | bernoulli’s equation |
Answer» C. stokes equation |
51. |
In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater? |
A. | flocculent settling |
B. | hindered settling |
C. | compression settling |
D. | discrete settling |
Answer» C. compression settling |
52. |
In which settling type, dilute suspension of particles takes place? |
A. | zone settling |
B. | compression settling |
C. | hindered settling |
D. | discrete settling |
Answer» C. hindered settling |
53. |
What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10-3cm. Given G=2.65, viscosity v=8 * 10-3cm2/Sec? |
A. | 0.01cm/sec |
B. | 0.13cm/sec |
C. | 0.24cm/sec |
D. | 0.36cm/sec |
Answer» B. 0.13cm/sec |
54. |
The average time required by water to pass through the settling tank is called |
A. | detention time |
B. | flow through period |
C. | time of flow |
D. | mean time |
Answer» B. flow through period |
55. |
In preliminary treatment of sewage, the operation which takes place, is |
A. | removal of fine suspended particles |
B. | removal of fine dissolved organic material |
C. | removal of lighter floating material |
D. | removal of harmful bacterias and other organisms |
Answer» C. removal of lighter floating material |
56. |
How many types of aerators are commonly used in the treatment of wastewater? |
A. | 2 |
B. | 3 |
C. | 4 |
D. | 5 |
Answer» A. 2 |
57. |
The detention period of detritus tank is |
A. | 40 seconds |
B. | 1 minute |
C. | 3 minute |
D. | 1 hour |
Answer» C. 3 minute |
58. |
How many types of trickling filters are used in sewage treatment? |
A. | 1 |
B. | 5 |
C. | 3 |
D. | 2 |
Answer» D. 2 |
59. |
The depth of the filter media of intermittent filter is |
A. | 45cm |
B. | 60cm |
C. | 20cm |
D. | 25cm |
Answer» B. 60cm |
60. |
Which of the following filter is used in the anaerobic treatment of sewage? |
A. | intermittent sand |
B. | trickling filter |
C. | contact filter |
D. | biological filter |
Answer» D. biological filter |
61. |
The maximum size of filter media of a percolating filter is |
A. | 10mm |
B. | 25mm |
C. | 60mm |
D. | 75mm |
Answer» D. 75mm |
62. |
The recirculation ratio for the low rate trickling filter is |
A. | 1 |
B. | 2 |
C. | 3 |
D. | 0 |
Answer» D. 0 |
63. |
The BOD after the filtration of sewage from the low rate trickling filter is |
A. | 40-50% |
B. | 80-90% |
C. | 70-80% |
D. | 90-99% |
Answer» B. 80-90% |
64. |
The efficiency of a percolating filter is given by |
A. | 100/(1+0.0044 (??)) |
B. | 100/(1+0.044 (??) 1/2) |
C. | 100/(1+0.44 (??) 1/2) |
D. | 100/(1+0.0044 (??) 1/2) |
Answer» D. 100/(1+0.0044 (??) 1/2) |
65. |
The organic loading in low rate trickling filter is 900 kg/hectare- meter/day. What is the efficiency of the filter? |
A. | 0.431 |
B. | 0.883 |
C. | 0.0704 |
D. | 0.83 |
Answer» B. 0.883 |
66. |
The color of the secondary sludge produced from the high rate trickling filter is |
A. | gray |
B. | black |
C. | brown |
D. | green |
Answer» C. brown |
67. |
is the ratio of volume of recirculated sewage to the raw sewage. |
A. | recirculation factor |
B. | recirculation ratio |
C. | food to mass ratio |
D. | bod |
Answer» B. recirculation ratio |
68. |
The size of filter media in a high rate trickling filter is |
A. | 10-20mm |
B. | 34-68mm |
C. | 25-60mm |
D. | 20-50mm |
Answer» C. 25-60mm |
69. |
Which of the following is called as air diffusion method? |
A. | activated sludge aeration |
B. | diffused air aeration |
C. | mechanical aeration |
D. | combined aeration |
Answer» B. diffused air aeration |
70. |
The maximum depth of aeration tank used in activated sludge process is |
A. | 1m |
B. | 2m |
C. | 4.5m |
D. | 5.5m |
Answer» C. 4.5m |
71. |
Which type of reactor is used for mixing chemicals in water treatment? |
A. | continuous reactor |
B. | batch reactor |
C. | plug flow reactor |
D. | fixed bed reactor |
Answer» B. batch reactor |
72. |
Which reactors are characterized by non- continuous reactions? |
A. | plug flow reactor |
B. | continuous reactor |
C. | batch reactor |
D. | fluidized bed reactor |
Answer» C. batch reactor |
73. |
SBR is a type of |
A. | aerobic process |
B. | activated sludge process |
C. | anaerobic process |
D. | chemical process |
Answer» B. activated sludge process |
74. |
How is mixing done in SBR? |
A. | manual |
B. | mechanical |
C. | air stripping |
D. | agitation by air |
Answer» B. mechanical |
75. |
In which stage of the SBR is aeration performed? |
A. | first |
B. | second |
C. | third |
D. | fourth |
Answer» B. second |
76. |
Which of the following is an anaerobic process for treating sewage? |
A. | oxidation pond |
B. | imhoff tank |
C. | oxidation ditch |
D. | rotating biological contactors |
Answer» B. imhoff tank |
77. |
The minimum design depth of oxidation pond is |
A. | 0.3m |
B. | 0.5m |
C. | 1m |
D. | 1.5m |
Answer» C. 1m |
78. |
The detention period of oxidation pond is |
A. | 12-36 hours |
B. | 4 hours |
C. | 10-20 days |
D. | 30-60 seconds |
Answer» C. 10-20 days |
79. |
The maximum BOD removal efficiency of an oxidation pond is |
A. | 0.9 |
B. | 0.68 |
C. | 0.7 |
D. | 0.8 |
Answer» A. 0.9 |
80. |
What is the minimum depth of water to be kept in the oxidation pond? |
A. | 0.3m |
B. | 0.5m |
C. | 1 m |
D. | 1.5m |
Answer» C. 1 m |
81. |
What is the shape of the oxidation ditch? |
A. | square |
B. | rectangular |
C. | circular |
D. | oval |
Answer» D. oval |
82. |
The ditch is lined by layer. |
A. | brick |
B. | cement |
C. | permeable |
D. | impermeable |
Answer» D. impermeable |
83. |
What is the range of MLSS concentration in oxidation ditch? |
A. | 500-1000 mg/l |
B. | 1000-2000 mg/l |
C. | 2000-4000 mg/l |
D. | 3000-5000 mg/l |
Answer» D. 3000-5000 mg/l |
84. |
Which of the following process is not adopted in oxidation ditches? |
A. | adsorption |
B. | desorption |
C. | oxidation |
D. | decomposition |
Answer» B. desorption |
85. |
The disposal of sewage from the septic tank is done by which of the following? |
A. | clarifier |
B. | soak pit |
C. | aerated lagoon |
D. | lamp holes |
Answer» B. soak pit |
86. |
The detention period of a septic tank is |
A. | 2 hours |
B. | 12-36 hours |
C. | 4 hours |
D. | 1 week |
Answer» B. 12-36 hours |
87. |
The concentration of biodegradable organic matter after the septic tank is |
A. | 50ppm |
B. | 100ppm |
C. | 200ppm |
D. | 75ppm |
Answer» C. 200ppm |
88. |
What is the maximum design flow of sewage in a septic tank? |
A. | 70 liters per person per day |
B. | 100 liters per person per day |
C. | 30 liters per person per day |
D. | 40 liters per person per day |
Answer» A. 70 liters per person per day |
89. |
Which of the following is not the method of disposal of sewage from septic tank? |
A. | upflow anaerobic filter |
B. | soil absorption system |
C. | vacuum filter |
D. | biological filters |
Answer» C. vacuum filter |
90. |
The minimum depth of septic tank as per design consideration is |
A. | 1.8m |
B. | 1m |
C. | 1.2m |
D. | 1.5m |
Answer» C. 1.2m |
91. |
The efficiency of a percolating filter is given by |
A. | 100/(1+0.0044 (μ)) |
B. | 100/(1+0.044 (μ) 1/2) |
C. | 100/(1+0.44 (μ) 1/2) |
D. | 100/(1+0.0044 (μ) 1/2) |
Answer» D. 100/(1+0.0044 (μ) 1/2) |
92. |
Turbidity of water is usually measured in terms of |
A. | Sodium scale |
B. | Silica scale |
C. | Cobalt scale |
D. | Platinum scale |
E. | Calcium scale |
Answer» B. Silica scale |
93. |
Which of the following pollutant affects lungs? |
A. | Silica |
B. | Benzene |
C. | Lead |
D. | Aldrin |
E. | None of the above |
Answer» A. Silica |
94. |
Black holes are celestial bodies which |
A. | Have strong magentic field |
B. | Have strong electrical field |
C. | Do not allow any light to escape outside |
D. | Are self luminous bodies |
E. | Green |
Answer» C. Do not allow any light to escape outside |
95. |
The emission of carbon monoxide in automobile exhaust will be low when the vehicle is |
A. | idling |
B. | accelerating |
C. | cruising at low speeds |
D. | cruising at high speeds |
E. | None of the above |
Answer» D. cruising at high speeds |
96. |
Temporary hardness in water in caused by salts like |
A. | Sulphates |
B. | Nitrates |
C. | Chlorides |
D. | Carbonates |
E. | All of the above |
Answer» D. Carbonates |
97. |
The colour of water is measured |
A. | In ferms of pH value |
B. | In terms of degree of hardness |
C. | In terms of platinum cobalt scale |
D. | ppm of dissolved solids |
E. | None of the above |
Answer» C. In terms of platinum cobalt scale |
98. |
Air pollutants common to urban environments are |
A. | sulphur dioxide |
B. | particulate matter |
C. | Hydrocarbons |
D. | All of the above |
E. | None of the above |
Answer» D. All of the above |
99. |
Ionisation chamber can be used for the detection of all of the following EXCEPT |
A. | beta rays |
B. | X-rays |
C. | gamma rays |
D. | Alpha rays |
E. | None of the above |
Answer» D. Alpha rays |
100. |
Which of the following is used in the recently developed technology for communication? |
A. | Optical fibre |
B. | Glass fibre |
C. | Nylon fibre |
D. | Quartz fibre |
E. | None of these |
Answer» A. Optical fibre |
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