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=R1/2S1/2/N�=�1/2�1/2/� |
B. | V=R2/3S2/N�=�2/3�2/� |
C. | V=R2/3S1/2/N�=�2/3�1/2/� |
D. | V=R2/3S1/2�=�2/3�1/2 |
Answer» C. V=R2/3S1/2/N�=�2/3�1/2/� |
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 |
101. | All of the following give Beta and Gamma radiations EXCEPT |
A. | Iridium 192 |
B. | Iodine 131 |
C. | Cobalt 60 |
D. | Polonium 210 |
E. | None of the above |
Answer» D. Polonium 210 |
102. | Which of the following is pesticide? |
A. | Endrin |
B. | Aldrin |
C. | Toxaphone |
D. | DDT |
E. | All of the above |
Answer» E. All of the above |
103. | DDT is |
A. | An inorganic compound |
B. | A compound of phosphours |
C. | A chlorinated hydrocarbon |
D. | A naturally occurring chemical |
E. | None of the above |
Answer» C. A chlorinated hydrocarbon |
104. | Term REM is used for |
A. | solar radiation |
B. | flame photography |
C. | radiation exposure |
D. | none of the above |
E. | None of the above |
Answer» C. radiation exposure |
105. | While comparing tungsten filament lamps with fluorescent tubes, all of the following are the advantages in favour of tungsten filament lamp EXCEPT |
A. | Longer life |
B. | Low cost |
C. | More brightness |
D. | Simple installation |
E. | None of the above |
Answer» A. Longer life |
106. | Odours are generally expressed in terms of |
A. | Hardness number |
B. | Gravity number |
C. | Index number |
D. | Threshold number |
E. | None of the above |
Answer» D. Threshold number |
107. | Disinfection of water is done by |
A. | Filtration |
B. | Alum |
C. | Ozone |
D. | Heating and cooling |
E. | Passing chlorine |
Answer» E. Passing chlorine |
108. | Which of the following is/are renewable sources of energy? |
A. | Fall or flow of water |
B. | Sun |
C. | Wood |
D. | All of the above |
E. | Green |
Answer» D. All of the above |
109. | The maximum concentration of lead in drinking water should not exceed. |
A. | 0.0005 mg/litre |
B. | 0.005 mg/litre |
C. | 0.05 mg/litre |
D. | 0.5 mg/litre |
E. | 5 mg/litre |
Answer» C. 0.05 mg/litre |
110. | Ash content of a diesel fuel should not exceed |
A. | 10% |
B. | 1% |
C. | 0.50% |
D. | 0.01% |
E. | None of the above |
Answer» C. 0.50% |
111. | In power plant an electrostatic precipitators is installed between |
A. | Forced draft fan and furnace |
B. | Furnace and chimney |
C. | Primary air and secondary air |
D. | Induced draft fan and forced draft fan |
E. | Air preheater and water treatment plant |
Answer» B. Furnace and chimney |
112. | Which emission has generally least proportion from a diesel engine as compared to a petrol engine? |
A. | Oxides of nitrogen |
B. | Hydrocarbons |
C. | Carbon monoxide |
D. | All of the above |
E. | None of the above |
Answer» A. Oxides of nitrogen |
113. | Which of the following turbidimeter gives direct readings in ppm |
A. | Jackson turbidimeter |
B. | Hellige turbidimeter |
C. | Baylis turbidimeter |
D. | All of the above |
E. | None of the above |
Answer» A. Jackson turbidimeter |
114. | Which of the following gas can be analysed by chemiluminescence? |
A. | Ozone |
B. | Carbon dioxide |
C. | Nitrogen |
D. | All of the above |
E. | None of the above |
Answer» A. Ozone |
115. | Permissible noise level in small conference room is |
A. | 10 to 15 dB |
B. | 15 to 25 dB |
C. | 35 to 40 dB |
D. | 55 to 60 dB |
E. | None of the above |
Answer» C. 35 to 40 dB |
116. | The aeration of water is done for the removal of |
A. | Colour |
B. | Turbidity |
C. | Bacteria |
D. | Odour |
E. | Hardness |
Answer» D. Odour |
117. | The method used for the removal of fine suspended particle is |
A. | Filtration |
B. | Agitation |
C. | Flotation |
D. | Aeration |
E. | Screening |
Answer» A. Filtration |
118. | Which organisms cause infections diseases? |
A. | Viruses |
B. | Worms |
C. | Protozoa |
D. | Fungi |
E. | All of the above |
Answer» E. All of the above |
119. | Alum increases |
A. | Hardness of water |
B. | Carbonates of water |
C. | Sulphates in water |
D. | Acidity of water |
E. | None of the above |
Answer» D. Acidity of water |
120. | Which of the following industry will usually have the highest concumption of water for processing? |
A. | Foundry |
B. | Steel plant |
C. | Automobile industry |
D. | Paper mill |
E. | Aluminium industry |
Answer» D. Paper mill |
121. | Electrodialysis is the process of removal of |
A. | soluble gases in water |
B. | dissolved solids in water |
C. | suspended solids in water |
D. | none of the above |
E. | None of the above |
Answer» B. dissolved solids in water |
122. | The presence of fluorides in drinking water helps in |
A. | Purification of water |
B. | Preventing decaying of teeth |
C. | Deodourisation of water |
D. | Reduces fungi formation |
E. | Killing aerobic bacteria |
Answer» B. Preventing decaying of teeth |
123. | Which radio nuclide has the least half life period? |
A. | Carbon 14 |
B. | Iodine 131 |
C. | Radium |
D. | Hydrogen 3 |
E. | None of the above |
Answer» B. Iodine 131 |
124. | Identify the incorrect statement if any |
A. | If the pH value of water is 14 the water has maximum alkalinity |
B. | pH value of 6 represents acidic water |
C. | Water having pH value 4 will be more acidic than water having pH value of 6 |
D. | Maximum acidity of water is indicated by pH value of zero |
E. | None of the above |
Answer» D. Maximum acidity of water is indicated by pH value of zero |
125. | The science of poisons – their effects, antidotes and detection, is known as |
A. | Toxicology |
B. | Minerology |
C. | Petrology |
D. | Poisonology |
E. | Hermetilogy |
Answer» A. Toxicology |
126. | Which of the following can have octane rating of more than 100? |
A. | Gobar gas |
B. | Methyl alcohol |
C. | Benzol |
D. | Ethyl alcohol |
E. | None of the above |
Answer» C. Benzol |
127. | Which thermometer is used to indicate the lowest temperature? |
A. | Clinical thermometer |
B. | Alcohol thermometer |
C. | Resistance thermometer |
D. | Liquid thermometer |
E. | Green |
Answer» B. Alcohol thermometer |
128. | In the jet propulsion, efficiency of the propulstion depends upon |
A. | The speed of the vehicle |
B. | Height at which the vehicle is travelling |
C. | Density of the medium in which the vehicle is travelling |
D. | All of the above |
E. | Green |
Answer» C. Density of the medium in which the vehicle is travelling |
129. | The speed of sound in air is |
A. | 144 m/s |
B. | 344 m/s |
C. | 1344 m/s |
D. | 3344 m/s |
E. | None of the above |
Answer» B. 344 m/s |
130. | Which of the following shading device will transmit least leat inside a room? |
A. | Plain glass sheet 3 mm thick |
B. | Plain glass sheet with wire mesh outside |
C. | Plain glass sheet with Venetion blind inside |
D. | Plain glass with curtain inside |
E. | None of the above |
Answer» D. Plain glass with curtain inside |
131. | All of the following pollutants are produced as a result of decaying organic matter EXCEPT |
A. | Ammonia |
B. | Sulphur dioxide |
C. | Methane |
D. | Hydrogen sulphide |
E. | None of the above |
Answer» B. Sulphur dioxide |
132. | Half life period for carbon 14 is nearly |
A. | 1.2 days |
B. | 5.73 days |
C. | 5.73 years |
D. | 5730 days |
E. | None of the above |
Answer» D. 5730 days |
133. | The unit parts per million is identical to |
A. | Grains per galleon |
B. | Pounds per cubic foot |
C. | Milligrams per kg |
D. | Tonnes peracre foot |
E. | None of the above |
Answer» C. Milligrams per kg |
134. | Which fuel will have least air consumption per kg of fuel during consumption? |
A. | Gasoline |
B. | Benzol |
C. | Spirit |
D. | Lubricating oil |
E. | None of the above |
Answer» C. Spirit |
135. | The desirable temperature inside an air conditioned auditorium is |
A. | 0?C |
B. | 5?C |
C. | 10?C |
D. | 20?C |
E. | None of the above |
Answer» D. 20?C |
136. | One kg of octane is burnt by four alternative processes given below. In which case the work available will be maximum |
A. | When burnt in an open pan in atmosphere |
B. | When burnt in an internal combustion engine |
C. | When burnt in a fuel cell |
D. | When burnt in a reversible process |
E. | None of the above |
Answer» D. When burnt in a reversible process |
137. | Which of the following is a cold cathode lamp? |
A. | Sodium vapour lamp |
B. | High pressure mercury vapour lamp |
C. | Low pressure mercury vapour lamp |
D. | Neon lamp |
E. | None of the above |
Answer» D. Neon lamp |
138. | Corrosive action of water could be due to its |
A. | alkalinity |
B. | hardness |
C. | dissolved oxygen |
D. | Any of the above |
E. | None of the above |
Answer» D. Any of the above |
139. | The anitdote for the poisonous effects due to mercury, is |
A. | Vitamin K |
B. | BAL |
C. | Thiosulphate |
D. | Altropine |
E. | Any of the above |
Answer» B. BAL |
140. | The speed of sound through human body is around |
A. | 344 m/s |
B. | 688 m/s |
C. | 1560 m/s |
D. | 3120 m/s |
E. | None of the above |
Answer» C. 1560 m/s |
141. | A fuel of octane rating 85 matches the antiknock qualities of a mixture consisting of |
A. | 85% petrol + 15% diesel |
B. | 15% petrol + 85% diesel |
C. | 85% benzene + 15% methyl chloride |
D. | 85% octane + 15% heptane |
E. | None of the above |
Answer» D. 85% octane + 15% heptane |
142. | For controlling the growth of algae, the chemical generally used is |
A. | Alum |
B. | Lime |
C. | Bleaching powder |
D. | Copper sulphate |
E. | Ozone |
Answer» D. Copper sulphate |
143. | Out of the following metals the least permissible percentage in drinking water is |
A. | Chromium |
B. | Copper |
C. | Zinc |
D. | Lead |
E. | None of the above |
Answer» A. Chromium |
144. | The first aid for a victim of electric shock is |
A. | bandage |
B. | sprinkling of water on the face |
C. | glass of milk and cold water |
D. | artificial respiration |
E. | None of the above |
Answer» D. artificial respiration |
145. | Prechlorination |
A. | Improves coagulation |
B. | Reduces odours |
C. | Reduces organisms |
D. | All of the above |
E. | None of the above |
Answer» E. None of the above |
146. | Which of the following engines uses two fuels simulataneously? |
A. | Multifuel engine |
B. | Wankel engines |
C. | Free piston gas generator |
D. | Dual fuel engines |
E. | None of the above |
Answer» D. Dual fuel engines |
147. | On board ships, the source of drinking water may be |
A. | Rain water |
B. | Sea water |
C. | Desalted sea water |
D. | Pumped deep sea water |
E. | Any of the above |
Answer» C. Desalted sea water |
148. | Which pollutants result from automobile exhaust? |
A. | Carbon monoxide |
B. | Nitrous oxide |
C. | Hydrocarbons |
D. | Sulphur dioxide |
E. | All of the above |
Answer» E. All of the above |
149. | The flouride content in the drinking water should not exceed |
A. | 200 mg/litre |
B. | 150 mg/litre |
C. | 100 mg/litre50 mg/litre |
D. | 50 mg/litre |
E. | 1 mg/litre |
Answer» E. 1 mg/litre |
150. | How many kg of air will contain one kg of oxygen? |
A. | 1 kg |
B. | 4.35 kg |
C. | 8.70 kg |
D. | 12.5 kg |
E. | None of the above |
Answer» B. 4.35 kg |
151. | The bactericidal, virucidal and cysticidal efficiency of chlorine as a disinfectant |
A. | increases with a decrease in pH |
B. | increases with a increase in pH |
C. | decreases with a decrease in pH |
D. | decreases with an increase in pH |
E. | None of the above |
Answer» A. increases with a decrease in pH |
152. | The air consumption of a four stroke diesel engine per rated BHP per hour will be |
A. | 1 kg |
B. | 5 to 7 kg |
C. | 10 to 14 kg |
D. | 20 kg |
E. | None of the above |
Answer» B. 5 to 7 kg |
153. | The discharge of hydrocarbons from automobile exhaust is maximum when the vehicle is |
A. | Idling |
B. | Cruising at low speeds |
C. | Accelerating |
D. | Decelerating |
E. | Cruising at high speeds |
Answer» A. Idling |
154. | The term BOD is associated with pollution arising out of |
A. | air |
B. | water |
C. | noise |
D. | land |
E. | None of the above |
Answer» B. water |
155. | Lead poisoning occurs when the lead content in water is |
A. | 300 – 500 ppm |
B. | 30 – 50 ppm |
C. | 10 – 15 ppm |
D. | 3 – 5 ppm |
E. | 0.3 – 0.5 ppm |
Answer» E. 0.3 – 0.5 ppm |
156. | Which of the following does not use ambient air for propulsion? |
A. | Turbo jet |
B. | Pulse jet |
C. | Turbo-prop |
D. | Rocket |
E. | None of the above |
Answer» D. Rocket |
157. | Which of the following units measures the memory of the Computer? |
A. | Volts |
B. | Amperes |
C. | Ohms |
D. | Bits |
E. | None of these |
Answer» D. Bits |
158. | A hard water may contain |
A. | Calcium carbonate |
B. | Magnesium sulphate |
C. | Magnesium bicarbonate |
D. | Any of the above |
E. | None of the above |
Answer» D. Any of the above |
159. | Which of the following operation produces highest noise level? |
A. | welding |
B. | Riveting |
C. | Machining |
D. | Pressing |
E. | None of the above |
Answer» B. Riveting |
160. | Water gas is a mixture of |
A. | CO and H2 |
B. | N2 and H2 |
C. | CO2 and N2 |
D. | SO2, CO2 and N2 |
E. | None of the above |
Answer» A. CO and H2 |
161. | Which of the following gas has least proportion in atmospheric air? |
A. | Argon |
B. | Carbondioxide |
C. | Neon |
D. | Helium |
E. | None of the above |
Answer» D. Helium |
162. | Which of the following symptom is not common between food poisoning and carbon monoxide poisoning? |
A. | Nausea |
B. | Vomiting |
C. | Headache |
D. | All of the above |
E. | None of the above |
Answer» C. Headache |
163. | The atmosphere gets heated up mainly by |
A. | Direct sun-rays |
B. | Radiation from the earth’s surface |
C. | Heat of the earth’s interior |
D. | Radiogenic heat |
E. | None of these |
Answer» B. Radiation from the earth’s surface |
164. | The ratio activity of water due to Strontium can be removed by |
A. | Aeration |
B. | Alum coagulation |
C. | Phosphate coagulation |
D. | Lime |
E. | Lime – Soda solution |
Answer» C. Phosphate coagulation |
165. | Aeration of water is done for all of the following purposes EXCEPT for |
A. | removal of bad tastes |
B. | removal of carbon dioxide |
C. | increasing the quantity of oxygen in water |
D. | removal of temporary hardness |
E. | None of the above |
Answer» D. removal of temporary hardness |
166. | Which of the following plant is highly sensitive to mercury vapour? |
A. | Sunflower |
B. | Ivy |
C. | Aloc |
D. | Cherry |
E. | Sarcococca |
Answer» A. Sunflower |
167. | The emission of carbon monoxide in automobile exhaust will be low when the vehicle is |
A. | Idling |
B. | Cruising at low speed |
C. | Cruising at high speed |
D. | Accelerating |
E. | Decelerating |
Answer» C. Cruising at high speed |
168. | For removal of temporary hardness of water |
A. | Water is filtered |
B. | Water is boiled |
C. | Alum is added to water |
D. | Lime is added to water |
E. | Chlorine is passed through water |
Answer» C. Alum is added to water |
169. | The total count of bacteria in portable water should not exceed |
A. | 10,000 per c.c. |
B. | 5000 per c.c. |
C. | 998 per c.c. |
D. | 10 per c.c. |
E. | 1 mg/litre |
Answer» D. 10 per c.c. |
170. | The rate at which atoms of radioactive sources disintegrate is measured in terms of |
A. | Cuire |
B. | Atomic number |
C. | Wavelength |
D. | Frequency |
E. | None of the above |
Answer» A. Cuire |
171. | BF3 counter can detect which of the following radiations? |
A. | Alpha particles |
B. | Neutrons |
C. | X-rays |
D. | Beta rays |
E. | None of the above |
Answer» B. Neutrons |
172. | For minimal eye irritation, pH value of swimming pool water should be in the range |
A. | 6.2 to 6.8 |
B. | 6.5 to 7.0 |
C. | 7.0 to 7.2 |
D. | 7.5 to 7.6 |
E. | None of the above |
Answer» D. 7.5 to 7.6 |
173. | Car speed of a lift is usually |
A. | 0.1 to 0.3 m/s |
B. | 0.5 to 1 m/s |
C. | 2 to 5 m/s |
D. | 7 to 10 m/s |
E. | None of the above |
Answer» B. 0.5 to 1 m/s |
174. | A blue smoke from a diesel engine indicates presence of |
A. | Nitrous oxide |
B. | Carbon dioxide |
C. | Carbon monoxide |
D. | Unburnt oil |
E. | Unburnt carbon |
Answer» D. Unburnt oil |
175. | Which of the following is not a constituent of coal? |
A. | Hydrogen |
B. | Nitrogen |
C. | Inorganic matter |
D. | Manganese |
E. | None of the above |
Answer» D. Manganese |
176. | For portable water the permissible pH value is |
A. | 1 – 4.5 |
B. | 4.5 – 7 |
C. | 7 – 8.5 |
D. | 9 — 11 |
E. | 11 — 14 |
Answer» C. 7 – 8.5 |
177. | The percentage of krypton in atmospheric air is around |
A. | 0.01 ppm |
B. | 0.1 ppm |
C. | 1 ppm |
D. | 10 ppm |
E. | None of the above |
Answer» C. 1 ppm |
178. | Which of the following is the major source of environmental pollution in urban areas? |
A. | Rolling mills |
B. | Power plants |
C. | Automobiles |
D. | Floor mills |
E. | Electronic industries |
Answer» C. Automobiles |
179. | Which of the following is considered as the noble gas? |
A. | Oxygen |
B. | Ozone |
C. | Hydrogen |
D. | Argon |
E. | None of these |
Answer» D. Argon |
180. | Which of the following is an artificial source of energy? |
A. | Sun |
B. | Coal |
C. | Wood |
D. | Electricity |
E. | None of these |
Answer» D. Electricity |
181. | The hardness of soft water (in ppm) is |
A. | 0 – 50 |
B. | 50 – 150 |
C. | 200 – 350 |
D. | 375 – 500 |
E. | 500 – 1000 |
Answer» A. 0 – 50 |
182. | The cycle of life, death and decay involving organic nitrogeneous matter is called |
A. | The sulphur cycle |
B. | The nitrogen cycle |
C. | The carbon cycle |
D. | The hydrological cycle |
E. | None of the above |
Answer» B. The nitrogen cycle |
183. | The process of removal of permanent hardness of water is |
A. | Zeolite process |
B. | Sedimentation process |
C. | Filtration process |
D. | Boiling process |
E. | Lime process |
Answer» A. Zeolite process |
184. | Fuel which detonates easity is |
A. | Benzene |
B. | Iso-octance |
C. | n-heptane |
D. | Toulene |
E. | None of the above |
Answer» C. n-heptane |
185. | Which of the following constituent has highest proportion in atmospheric air? |
A. | Nitrous oxide |
B. | Carbon monoxide |
C. | Helium |
D. | Neon |
E. | None of the above |
Answer» D. Neon |
186. | Which of the following acts as ignition accelerator for C.I. engine fuels? |
A. | Acetone peroxide |
B. | Hydrogen peroxide |
C. | Aromatic compounds |
D. | n-heptane |
E. | None of the above |
Answer» A. Acetone peroxide |
187. | Which of the following measures the heat of combustion? |
A. | Bomb’s calorimeter |
B. | Thermostat |
C. | Beckmann’s thermometer |
D. | Refrigerator |
E. | Green |
Answer» A. Bomb’s calorimeter |
188. | Which of the following is unlikely to be the pollutant from a sulphuric acid plant? |
A. | Sulphur dioxide |
B. | Sulphur trioxide |
C. | Acid mist |
D. | Hydrogen sulphide |
E. | All of the above |
Answer» D. Hydrogen sulphide |
189. | For the maximum alkalinity of water, the pH value would be |
A. | Zero |
B. | 7 |
C. | 8 |
D. | 14 |
E. | 20 |
Answer» D. 14 |
190. | Zeolite is |
A. | A naturally occurring salt |
B. | Hydread silica |
C. | Silicon carbide |
D. | Hydrated calcium silicate |
E. | Hydrated alumino-silicate |
Answer» E. Hydrated alumino-silicate |
191. | Which of the following particles will be smallest in size? |
A. | Smog |
B. | Rain |
C. | Drizzle |
D. | Mist |
E. | Fog |
Answer» A. Smog |
192. | Which of the following disease is associated with air pollution? |
A. | Bronchial asthma |
B. | Chronic bronchitis |
C. | Emphysema |
D. | All of the above |
E. | None of the above |
Answer» D. All of the above |
193. | The water borne bacterial infections may cause |
A. | Typhoid fever |
B. | Dysentery |
C. | Cholera |
D. | Any of the above |
E. | None of the above |
Answer» D. Any of the above |
194. | LPG stands for |
A. | Liquefied petroleum gas |
B. | Low pressure gas |
C. | Lubricated and purified gas |
D. | Low purity gas |
E. | None of the above |
Answer» A. Liquefied petroleum gas |
195. | Which of the following symptoms will not show that combustion is necessarily complete? |
A. | Presence of free carbon is exhaust |
B. | Presence of carbon monoxide in exhaust |
C. | Presence of oxygen in exhaust |
D. | Presence of nitrogen in exhaust |
E. | None of the above |
Answer» D. Presence of nitrogen in exhaust |
196. | Thiosulphate is the antidote for the poisonous effect due to |
A. | Arsenic |
B. | Lead |
C. | Mercury |
D. | Cyanide |
E. | Organic phosphorous compounds |
Answer» D. Cyanide |
197. | Low grade fuels have |
A. | low moisture content |
B. | low ash content |
C. | low calorific value |
D. | low carbon content |
E. | None of the above |
Answer» C. low calorific value |
198. | Curies is a measure of |
A. | biological effect of radiation which a man can sustain |
B. | the rate at which atoms of radioactive sources disintegrate |
C. | 86 ergs of energy per gram of air |
D. | ions percent in an ionised gas |
E. | None of the above |
Answer» A. biological effect of radiation which a man can sustain |
199. | The presence of algae in water indicates that the water is |
A. | Hard |
B. | Soft |
C. | Acidic |
D. | Pune |
E. | Free from turbidity |
Answer» C. Acidic |
200. | Electrostatic precipitators are largely used in |
A. | water treatment plants |
B. | sewage disposal plants |
C. | Thermal power plants |
D. | nuclear power plants |
E. | None of the above |
Answer» C. Thermal power plants |
201. | The maximum permissible turbidity for drinking water |
A. | Zero |
B. | 1 – 4 ppm |
C. | 15 – 25 ppm |
D. | 3 – 50 ppm |
E. | 30 – 50 ppm |
Answer» C. 15 – 25 ppm |
202. | Per capita consumption of water is usually taken as |
A. | 50 – 100 litres |
B. | 150 – 300 litres |
C. | 400 – 500 litres |
D. | 500 – 750 litres |
E. | 750 – 1000 litres |
Answer» B. 150 – 300 litres |
203. | The incubation period of Typhoid bacillus causing typhoid fever is |
A. | 1 to 3 days |
B. | 3 to 5 days |
C. | 7 to 21 days |
D. | 20 to 30 days |
E. | None of the above |
Answer» C. 7 to 21 days |
204. | Which of the following has least wave-length? |
A. | Cosmic rays |
B. | Ultraviolet rays |
C. | X-rays |
D. | Gamma rays |
E. | None of the above |
Answer» A. Cosmic rays |
205. | The most injurious components of automobile exhaust for environment are |
A. | Carbon monoxide and Carbon dioxide |
B. | Carbon monoxide and lead |
C. | Ethylene dichloride and ethylene dibromide |
D. | Carbon dioxide and Sulphur dioxide |
E. | Green |
Answer» A. Carbon monoxide and Carbon dioxide |
206. | The main disadvantage of hard water is |
A. | Higher density |
B. | More turbidity |
C. | Foul smell |
D. | Bad taste |
E. | Increased soap consumption |
Answer» E. Increased soap consumption |
207. | Which of the following area of work needs highest level of illumination? |
A. | Bakeries |
B. | Book binding |
C. | Confectionary factory |
D. | Clothing factory |
E. | None of the above |
Answer» D. Clothing factory |
208. | The speed of sound through water is nearly |
A. | 344 m/s |
B. | 750 m/s |
C. | 1500 m/s |
D. | 3000 m/s |
E. | None of the above |
Answer» C. 1500 m/s |
209. | Protection from radiations is possible through |
A. | shielding of source of radiation |
B. | increased distance from the source of radiation |
C. | limitation on time of exposure |
D. | All of the above |
E. | None of the above |
Answer» D. All of the above |
210. | Short circuit means |
A. | Direct flow of current between two points of different potential |
B. | Indirect flow of current between two points |
C. | Direct flow of current between points of the same potential |
D. | none of the above |
E. | Green |
Answer» A. Direct flow of current between two points of different potential |
211. | Swimming pool water requires |
A. | pre-chlorination |
B. | super-chlorination |
C. | dual-chlorination |
D. | de-chlorination |
E. | None of the above |
Answer» D. de-chlorination |
212. | Mycotoxins are poisonous chemicals produced by |
A. | bacteria |
B. | virus |
C. | molds |
D. | algae |
E. | None of the above |
Answer» C. molds |
213. | The maximum permissible level or pesticides, in general, in drinking water is nearly |
A. | 1 to 50 ppm |
B. | 50 to 100 ppm |
C. | 100 to 250 ppm |
D. | 250 to 500 ppm |
E. | 500 to 1000 ppm |
Answer» A. 1 to 50 ppm |
214. | The percentage of carbondioxide in atmospheric air is nearly |
A. | 3.2 percent |
B. | 0.32 percent |
C. | 0.032 percent |
D. | 0.0032 percent |
E. | None of the above |
Answer» C. 0.032 percent |
215. | Turbidity in water is due to |
A. | Algae |
B. | Fungi |
C. | Organic salts |
D. | Finely divided particles of clay, silt and organic matter |
E. | None of the above |
Answer» D. Finely divided particles of clay, silt and organic matter |
216. | The emission of oxides of nitrogen in automobile exhaust will be least when the vehicle is |
A. | Idling |
B. | Cruising at low speed |
C. | Cruising at high speed |
D. | Accelerating |
E. | Decelerating |
Answer» A. Idling |
217. | Mottling of teeth is associated with the presence of |
A. | Chloride in water |
B. | Calcium in water |
C. | Sodium chloride in water |
D. | Sulphur in water |
E. | Fluorides in water |
Answer» E. Fluorides in water |
218. | The average percentage of carbon and hydrogen in petrol may be roughly given as |
A. | 50% C, 50% H2 |
B. | 85% C, 15% H2 |
C. | 15% C, 85% H2 |
D. | 70% C, 30% H2 |
E. | None of the above |
Answer» B. 85% C, 15% H2 |
219. | Sulphurdioxide can be measured by |
A. | ultraviolet pulsed fluorescence |
B. | flame photography |
C. | permeation tube calibratio |
D. | Any of the above |
E. | None of the above |
Answer» D. Any of the above |
220. | Brackish taste of water is due to |
A. | Chlorides of sodium |
B. | Fluorides of sodium |
C. | Turbidity |
D. | Dead bacteria |
E. | Any of the above |
Answer» A. Chlorides of sodium |
221. | Which of the following is unlikely to be the pollutant from a sulphuric acid plant? |
A. | Sulphur dioxide |
B. | Sulphur trioxide |
C. | Acid moist |
D. | Hydrogen sulphide |
E. | None of the above |
Answer» D. Hydrogen sulphide |
222. | Which of the following is the major source of flyash emission? |
A. | Sintering plants |
B. | Oil refineries |
C. | Blast furnace |
D. | Power plants |
E. | Sulphuric acid plant |
Answer» D. Power plants |
223. | The process of killing the ineffective bacteria from the water and making it safe for use is known as |
A. | Disinfection |
B. | Sterilization |
C. | Filtration |
D. | Purification |
E. | None of the above |
Answer» A. Disinfection |
224. | Theodolite is used by |
A. | Surveyors |
B. | Cartrographers |
C. | Physicists |
D. | Electronic Engineers |
E. | None of these |
Answer» A. Surveyors |
225. | Which of the following space needs maximum number of air changes per hour? |
A. | Assembly halls |
B. | Restaurants |
C. | Bed-rooms |
D. | Class rooms |
E. | None of the above |
Answer» B. Restaurants |
226. | Water with least contamination can be be obtained from |
A. | Rivers |
B. | Lakes |
C. | Wells |
D. | Reservoirs |
E. | Spring along the hill slope |
Answer» E. Spring along the hill slope |
227. | Which of the following chemical is least poisonous? |
A. | Arsenic |
B. | Lead |
C. | Sodium |
D. | Cyanide |
E. | Mercury |
Answer» C. Sodium |
228. | Disinfection of drinking water means removal of |
A. | Turbidity |
B. | Colour |
C. | Odour |
D. | Oxygen |
E. | Bacteria |
Answer» E. Bacteria |
229. | Scintillation counter can detect |
A. | beta rays |
B. | X-rays |
C. | gamma rays |
D. | All of the above |
E. | None of the above |
Answer» D. All of the above |
230. | Lead is a cumulative poison which ends up in |
A. | eyes |
B. | eyes and ears |
C. | bones and tissues |
D. | legs and hands |
E. | None of the above |
Answer» C. bones and tissues |
231. | Which of the following area of work needs lowest noise level? |
A. | Gymnasiums |
B. | Lecture halls |
C. | Library |
D. | Kitchens |
E. | None of the above |
Answer» C. Library |
232. | The hardness limit for portable water ranges between |
A. | 10 – 50 ppm |
B. | 50 – 65 ppm |
C. | 75 – 117 ppm |
D. | 150 – 250 ppm |
E. | 300 – 700 ppm |
Answer» C. 75 – 117 ppm |
233. | The process used for the removal of dissolved carbondioxide from the water, is known as |
A. | Coagulation |
B. | Agitation |
C. | Aeration |
D. | Sedimentation |
E. | Zeolitc |
Answer» C. Aeration |
234. | Which of the following automobile will provide least pollution problems |
A. | Diesel engine powered |
B. | Petrol engine powered |
C. | Gas turbine powered |
D. | Wankel engine powered |
E. | Battery powered |
Answer» E. Battery powered |
235. | Out of the following diesel engines, the minimum air consumption per BHP will be in |
A. | 4 stroke mechanical injection |
B. | 4 stroke air injection |
C. | 2 stroke mechanical injection pump scavenging |
D. | 2 stroke air injection |
E. | None of the above |
Answer» A. 4 stroke mechanical injection |
236. | The bad smell due to decomposition of sewage, on account of the action of bacteria, is mainly due to the presence of |
A. | Dead bacteria |
B. | Oxygen |
C. | Carbondioxide |
D. | Hydrogen sulphide |
E. | None of the above |
Answer» D. Hydrogen sulphide |
237. | The permissible level of HCN in drinking water is |
A. | Less than 0.01 mg/litre |
B. | Around 1 mg/litre |
C. | Around 5 mg/litre |
D. | Between 10 to 20 mg/litre |
E. | More than 50 mg/litre |
Answer» A. Less than 0.01 mg/litre |
238. | The chloride content in the water for public supplies should not exceed |
A. | 250 mg/litre |
B. | 100 mg/litre |
C. | 50 mg/litre |
D. | 20 mg/litre |
E. | 1 mg/litre |
Answer» A. 250 mg/litre |
239. | Which of the following fuel has maximum resistance to detonation? |
A. | Toulene |
B. | Benzene |
C. | Iso-octane |
D. | n-heptane |
E. | None of the above |
Answer» C. Iso-octane |
240. | The most frequent method of bacterial reproduction is by |
A. | Cell division |
B. | Sexual process |
C. | Budding |
D. | Colony formation |
E. | The formation of spores |
Answer» A. Cell division |
241. | Normally the colour of exhaust from a diesel engine is |
A. | black |
B. | white |
C. | yellow |
D. | reddish |
E. | None of the above |
Answer» A. black |
242. | Geiger Muller counter can detect |
A. | beta rays |
B. | X-rays |
C. | gamma rays |
D. | All of the above |
E. | None of the above |
Answer» D. All of the above |
243. | Which of the following radio-nuclide has the shortest half life? |
A. | Carbon 14 |
B. | Cesium 137 |
C. | Cobalt 60 |
D. | Iodine 131 |
E. | None of the above |
Answer» D. Iodine 131 |
244. | The becteria that can survive without oxygen is called |
A. | Facultative bacteria |
B. | Anerobic bacteria |
C. | Aerobic bacteria |
D. | Furobic bacteria |
E. | All of the above |
Answer» A. Facultative bacteria |
245. | Bit is the unit of |
A. | Amount of rain recorded |
B. | Memory of computer |
C. | Quantity of electricity |
D. | Intensity of an earthquake |
E. | None of these |
Answer» B. Memory of computer |
246. | The speed of sound will be maximum through |
A. | Water |
B. | Alcohol |
C. | Concrete |
D. | Aluminium |
E. | None of the above |
Answer» D. Aluminium |
247. | Dark, black smoke from diesel engines usually results when engine is |
A. | Idling |
B. | Running at slow speeds |
C. | Running at light loads |
D. | Running at full speed but under load conditions |
E. | Running at full load and full speed |
Answer» E. Running at full load and full speed |
248. | The noise level due to auto horn may be of the order of |
A. | 110 dB |
B. | 80 dB |
C. | 50 dB |
D. | 35 dB |
E. | None of the above |
Answer» A. 110 dB |
249. | Which one among the following terms best describes the method of converting a spherical surface into a plane surface? |
A. | Photogrammetry |
B. | Projection |
C. | Cartography |
D. | Geodesy |
E. | None of these |
Answer» B. Projection |
250. | Small concentrations of fluorides in water |
A. | reduce the prevalence of dental caries |
B. | increase the prevalence of dental carries |
C. | cause irritation in eyes |
D. | do not arm in any way |
E. | None of the above |
Answer» A. reduce the prevalence of dental caries |
251. | The disadvantage of hard water is |
A. | More soap consumption |
B. | Scale formation in boilers |
C. | Corrosion of pipes |
D. | Loss of taste in food |
E. | All of the above |
Answer» E. All of the above |
252. | The permissible hardness of water for public supplies is |
A. | 10 mg/litre |
B. | 25 mg/litre |
C. | 75 mg/litre |
D. | 115 mg/litre |
E. | 400 mg/litre |
Answer» D. 115 mg/litre |
253. | For the combustion of 1 kg of carbon, the quantity of oxygen required is |
A. | 2.62 kg |
B. | 3.67 kg |
C. | 8 kg |
D. | 11.6 kg |
E. | None of the above |
Answer» A. 2.62 kg |
254. | For controlling algae, the chemical generally used is |
A. | alum |
B. | lime |
C. | copper sulphate |
D. | bleaching powder |
E. | None of the above |
Answer» C. copper sulphate |
255. | Soft waters |
A. | Have corrosive action on metals |
B. | Dissolve lead |
C. | Corrode iron |
D. | All of the above |
E. | None of the above |
Answer» D. All of the above |
256. | What will be the colour of red rose when it is seen through green glass? |
A. | White |
B. | Black |
C. | Pink |
D. | Brown |
E. | Green |
Answer» D. Brown |
257. | Acute poisoning may be the result of entry into the body of large of concentrated doses of poison through |
A. | Breathing |
B. | Swalowing |
C. | Skin absorption |
D. | Injection |
E. | Any of the above |
Answer» E. Any of the above |
258. | Carbondioxide has all the following properties EXCEPT that it is |
A. | colourless |
B. | odourless |
C. | tasteless |
D. | readily soluble in water |
E. | None of the above |
Answer» D. readily soluble in water |
259. | The number of air changes per hour recommended for auditoria is |
A. | 3 to 6 |
B. | 6 to 10 |
C. | 10 to 12 |
D. | 15 to 20 |
E. | None of the above |
Answer» A. 3 to 6 |
260. | Identify the incorrect statement if any Zeolite process is suitable for |
A. | Removing temporary hardness |
B. | Removing permanent hardness |
C. | Cent percent removal of hardness |
D. | Acidic waters |
E. | When zeolite becomes inactive, it may be reactivated by flushing with brine solution |
Answer» D. Acidic waters |
261. | Which of the following constituent of air has the least percentage? |
A. | Argon |
B. | Carbon dioxide |
C. | Xenon |
D. | Neon |
E. | Helium |
Answer» C. Xenon |
262. | While smoke from a diesel engine can be expected during |
A. | Start up or idling |
B. | High load operating |
C. | High speed operation |
D. | All of the above |
E. | None of the above |
Answer» A. Start up or idling |
263. | If with minimum quantity of potassium permanganate, the pink colour of water disappears soon, then it shows that |
A. | Water is hard |
B. | Water is acidic |
C. | Water is alkaline |
D. | Organic matter is present in water |
E. | Chlorine content is high in water |
Answer» D. Organic matter is present in water |
264. | Plants that grow in absence of sublight in water, are called |
A. | Algae |
B. | Shrubs |
C. | Fungi |
D. | Any of the above |
E. | All of the above |
Answer» C. Fungi |
265. | Which one of the following gases shows a different behaviour at high pressure? |
A. | Carbon dioxide |
B. | Water vapours |
C. | Hydrogen |
D. | Ozone |
E. | None of these |
Answer» C. Hydrogen |
266. | Bleaching power is |
A. | Lime |
B. | Stacked lime |
C. | Chloride of lime |
D. | Hypo-chloride of lime |
E. | Hypo-chlorite of lime |
Answer» E. Hypo-chlorite of lime |
267. | The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is |
A. | 10 |
B. | 5 |
C. | 3 |
D. | 2 |
E. | 1 |
Answer» C. 3 |
268. | The percentage of nitrogen in air by weight is around |
A. | 75.5 percent |
B. | 65.5 percent |
C. | 24.3 percent |
D. | 23.1 percent |
E. | 20.3 percent |
Answer» A. 75.5 percent |
269. | What is a laser? |
A. | Electro-magnetic waves |
B. | Ultrasonic waves |
C. | Supersonic waves |
D. | Light amplification by stimulated emission of radiation |
E. | Green |
Answer» D. Light amplification by stimulated emission of radiation |
270. | All of the following pollutants affect heart EXCEPT |
A. | Cadmium |
B. | Arsenic |
C. | Lead |
D. | Carbon monoxide |
E. | None of the above |
Answer» B. Arsenic |
271. | The permissible hardness of water for low pressure boiler is |
A. | 50 mg/litre |
B. | 150 mg/litre |
C. | 250 mg/litre |
D. | 350 kg/litre |
E. | 450 mg/litre |
Answer» A. 50 mg/litre |
272. | Desalination is usually needed for |
A. | well water |
B. | rain water |
C. | sea water |
D. | river water |
E. | None of the above |
Answer» C. sea water |
273. | To keep the water safe against pathogenetic bacteria the residual chlorine should remain between |
A. | 0.05 to 0.2 ppm |
B. | 0.2 to 0.8 ppm |
C. | 1 ppm to 2 ppm |
D. | 6 ppm to 10 ppm |
E. | 10 ppm to 20 ppm |
Answer» A. 0.05 to 0.2 ppm |
274. | Which of the following industry is least polluting? |
A. | Cement industry |
B. | Oil refinery |
C. | Thermal power plants |
D. | Electronic industry |
E. | Rolling mills |
Answer» D. Electronic industry |
275. | Carbon monoxide poisoning may cause |
A. | headache |
B. | drowsiness |
C. | dizziness |
D. | Any of the above |
E. | None of the above |
Answer» D. Any of the above |
276. | When the trees are planted by road side, the average distance between two trees should be |
A. | 2 to 3 metres |
B. | 5 to 8 metres |
C. | 10 to 15 metres |
D. | 25 to 30 metres |
E. | None of the above |
Answer» C. 10 to 15 metres |
277. | Addition to alum increases |
A. | hardness of water |
B. | carbonates of water |
C. | sulphates in water |
D. | Acidity of water |
E. | None of the above |
Answer» D. Acidity of water |
278. | If the pH of water is 7 it means the water is |
A. | acidic |
B. | alkaline |
C. | neutral |
D. | free from oxygen |
E. | None of the above |
Answer» C. neutral |
279. | The volume fraction of ozone in atmospheric air is nearly |
A. | 0.02 ppm |
B. | 0.2 ppm |
C. | 2 ppm |
D. | 20 ppm |
E. | None of the above |
Answer» A. 0.02 ppm |
280. | Suspended liquid droplets generated by condensation from the gaseous to the liquid state or by breaking up a liquid into a dispersed state is known as |
A. | Dust |
B. | Fume |
C. | Mist |
D. | Vapours |
E. | None of the above |
Answer» C. Mist |
281. | The maximum acceptable noise level in offices is |
A. | 10 dB |
B. | 40 dB |
C. | 75 dB |
D. | 100 dB |
E. | None of the above |
Answer» B. 40 dB |
282. | Type of radiation expected from earbon 14 is |
A. | Alpha |
B. | Beta |
C. | Gamma |
D. | Alpha, Beta, Gamma |
E. | None of the above |
Answer» B. Beta |
283. | The pH value of sea water is usually |
A. | 1 |
B. | Between 3 and 5 |
C. | Between 5 and 7 |
D. | Between 8 and 8.3 |
E. | Between 13.7 and 14 |
Answer» D. Between 8 and 8.3 |
284. | Which of the following is the major source of pollutant hydrogen sulphide? |
A. | Decaying organic matter |
B. | Auto exhaust |
C. | Oil burners |
D. | Solar energy |
E. | None of the above |
Answer» A. Decaying organic matter |
285. | The pH value of concentrated sulphuric acid could be expected between |
A. | 7 and 6 |
B. | 6 and 5 |
C. | 4 and 3 |
D. | 3 and 1 |
E. | 1 and 0 |
Answer» E. 1 and 0 |
286. | Ultra-violet rays are used for the treatment of water known as |
A. | Dechlorination |
B. | Disinfection |
C. | Aeration |
D. | Filtration |
E. | Bleaching |
Answer» B. Disinfection |
287. | The process of kolling at the pathogenic bacteria of water-borne diseases to make it safe for hospital use, is known as |
A. | Zeoliting |
B. | Debacterialisation |
C. | Sterilization |
D. | Aeration |
E. | Chlorination |
Answer» C. Sterilization |
288. | Electric fuses provide protection against |
A. | sparking |
B. | overloads |
C. | single phasing |
D. | low current and voltage |
E. | None of the above |
Answer» B. overloads |
289. | In one litre sample of drinking water the coliform organism should not exceed |
A. | 1000 |
B. | 500 |
C. | 100 |
D. | 10 |
E. | 1 |
Answer» D. 10 |
290. | When the trees are to be planted by the road side the minimum distance from the out edge of side width should be |
A. | 0.5 to 1 metre |
B. | 2 to 3 metres |
C. | 5 to 8 metres |
D. | 12 to 15 metres |
E. | None of the above |
Answer» B. 2 to 3 metres |
291. | All of the following are souhd obsorptive materials EXCEPT |
A. | Rugs |
B. | Mirrors |
C. | Carpets |
D. | Heavy drapes |
E. | None of the above |
Answer» B. Mirrors |
292. | Which of the following pollutant results from decaying organic matter? |
A. | Acetylene |
B. | Ozone |
C. | Ammonia |
D. | Nitric oxide |
E. | None of the above |
Answer» C. Ammonia |
293. | All of the following pollutants result from auto-exhaust EXCEPT |
A. | Acetylene |
B. | Olefins |
C. | Hydrogen sulphide |
D. | Ethylene |
E. | None of the above |
Answer» A. Acetylene |
294. | Dust particles in industrial processes may be generated by |
A. | Crushing |
B. | Grinding |
C. | Detonation |
D. | Rapid impact |
E. | Any of the above processes |
Answer» E. Any of the above processes |
295. | Turbidity in water may be removed by |
A. | Sedimentation |
B. | Filtration |
C. | Agitation |
D. | Aeration |
E. | Oxidation |
Answer» A. Sedimentation |
296. | Which of the following area of work needs lowest level of illumination? |
A. | Engraving |
B. | Cloth inspection |
C. | Assembly of instrument |
D. | Paper converting processes |
E. | None of the above |
Answer» D. Paper converting processes |
297. | Which one of the following is not directly related to the phenomenon of evaporation? |
A. | Temperature of liquid |
B. | Volume of the liquid |
C. | Surface area of the liquid |
D. | Surface winds over the liquid |
E. | None of these |
Answer» B. Volume of the liquid |
298. | For the maximum acidity of water, pH value would be |
A. | 0.01 |
B. | 0.1 |
C. | 1 |
D. | 10 |
E. | 11 |
Answer» A. 0.01 |
299. | The process of passing the water through a thick layer of filtering media is known as |
A. | Sedimentation |
B. | Filtration |
C. | Disinfection |
D. | Purification |
E. | Putrification |
Answer» B. Filtration |
300. | Which of the following is an insect born disease? |
A. | Q-fever |
B. | Ring worm |
C. | Jaundice |
D. | Tetanus |
E. | None of the above |
Answer» A. Q-fever |
301. | In case of public supplies, the maximum permissible nitrite content is |
A. | 250 ppm |
B. | 200 ppm |
C. | 100 ppm |
D. | 50 ppm |
E. | zero ppm |
Answer» E. zero ppm |
302. | All of the following are pesticides EXCEPT |
A. | Aldrin |
B. | Endrin |
C. | Chloroform |
D. | BHC |
E. | None of the above |
Answer» C. Chloroform |
303. | The presence of which of the following material in water is not considered to be dangerous? |
A. | Lead |
B. | Copper |
C. | Mercury |
D. | Calcium |
E. | Zinc |
Answer» D. Calcium |
304. | The desirable temperature of portable water is |
A. | zero degree centigrade |
B. | 10?C |
C. | 20?C |
D. | 27?C |
E. | 37?C |
Answer» B. 10?C |
305. | Turbidity of water is usually measured in terms of |
A. | Platinum scale |
B. | Cobalt scale |
C. | Silica scale |
D. | Calcium scale |
E. | Sodium scale |
Answer» C. Silica scale |
306. | Black holes are celestial bodies which |
A. | Are self luminous bodies |
B. | Do not allow any light to escape outside |
C. | Green |
D. | Have strong electrical field |
E. | Have strong magentic field |
Answer» B. Do not allow any light to escape outside |
307. | Which of the following is used in the recently developed technology for communication? |
A. | Optical fibre |
B. | Glass fibre |
C. | Quartz fibre |
D. | None of these |
E. | Nylon fibre |
Answer» A. Optical fibre |
308. | Disinfection of water is done by |
A. | Alum |
B. | Filtration |
C. | Heating and cooling |
D. | Ozone |
E. | Passing chlorine |
Answer» E. Passing chlorine |
309. | The maximum concentration of lead in drinking water should not exceed. |
A. | 0.5 mg/litre |
B. | 0.0005 mg/litre |
C. | 5 mg/litre |
D. | 0.005 mg/litre |
E. | 0.05 mg/litre |
Answer» E. 0.05 mg/litre |
310. | In power plant an electrostatic precipitators is installed between |
A. | Furnace and chimney |
B. | Induced draft fan and forced draft fan |
C. | Forced draft fan and furnace |
D. | Primary air and secondary air |
E. | Air preheater and water treatment plant |
Answer» A. Furnace and chimney |
311. | The aeration of water is done for the removal of |
A. | Odour |
B. | Turbidity |
C. | Hardness |
D. | Colour |
E. | Bacteria |
Answer» A. Odour |
312. | The method used for the removal of fine suspended particle is |
A. | Flotation |
B. | Screening |
C. | Filtration |
D. | Agitation |
E. | Aeration |
Answer» C. Filtration |
313. | Which of the following industry will usually have the highest concumption of water for processing? |
A. | Foundry |
B. | Aluminium industry |
C. | Automobile industry |
D. | Steel plant |
E. | Paper mill |
Answer» E. Paper mill |
314. | The presence of fluorides in drinking water helps in |
A. | Preventing decaying of teeth |
B. | Purification of water |
C. | Reduces fungi formation |
D. | Killing aerobic bacteria |
E. | Deodourisation of water |
Answer» A. Preventing decaying of teeth |
315. | The science of poisons – their effects, antidotes and detection, is known as |
A. | Toxicology |
B. | Poisonology |
C. | Minerology |
D. | Hermetilogy |
E. | Petrology |
Answer» A. Toxicology |
316. | Which thermometer is used to indicate the lowest temperature? |
A. | Liquid thermometer |
B. | Alcohol thermometer |
C. | Green |
D. | Resistance thermometer |
E. | Clinical thermometer |
Answer» B. Alcohol thermometer |
317. | For controlling the growth of algae, the chemical generally used is |
A. | Bleaching powder |
B. | Lime |
C. | Ozone |
D. | Copper sulphate |
E. | Alum |
Answer» D. Copper sulphate |
318. | The flouride content in the drinking water should not exceed |
A. | 200 mg/litre |
B. | 150 mg/litre |
C. | 100 mg/litre50 mg/litre |
D. | 1 mg/litre |
E. | 50 mg/litre |
Answer» D. 1 mg/litre |
319. | The discharge of hydrocarbons from automobile exhaust is maximum when the vehicle is |
A. | Cruising at low speeds |
B. | Idling |
C. | Decelerating |
D. | Cruising at high speeds |
E. | Accelerating |
Answer» B. Idling |
320. | Lead poisoning occurs when the lead content in water is |
A. | 30 – 50 ppm |
B. | 300 – 500 ppm |
C. | 10 – 15 ppm |
D. | 3 – 5 ppm |
E. | 0.3 – 0.5 ppm |
Answer» E. 0.3 – 0.5 ppm |
321. | Which of the following units measures the memory of the Computer? |
A. | Bits |
B. | None of these |
C. | Volts |
D. | Amperes |
E. | Ohms |
Answer» A. Bits |
322. | The atmosphere gets heated up mainly by |
A. | Radiation from the earth’s surface |
B. | Radiogenic heat |
C. | Heat of the earth’s interior |
D. | Direct sun-rays |
E. | None of these |
Answer» A. Radiation from the earth’s surface |
323. | The ratio activity of water due to Strontium can be removed by |
A. | Phosphate coagulation |
B. | Lime |
C. | Lime – Soda solution |
D. | Alum coagulation |
E. | Aeration |
Answer» A. Phosphate coagulation |
324. | Which of the following plant is highly sensitive to mercury vapour? |
A. | Sarcococca |
B. | Sunflower |
C. | Ivy |
D. | Cherry |
E. | Aloc |
Answer» B. Sunflower |
325. | The emission of carbon monoxide in automobile exhaust will be low when the vehicle is |
A. | Idling |
B. | Cruising at low speed |
C. | Cruising at high speed |
D. | Decelerating |
E. | Accelerating |
Answer» C. Cruising at high speed |
326. | For removal of temporary hardness of water |
A. | Water is filtered |
B. | Chlorine is passed through water |
C. | Alum is added to water |
D. | Water is boiled |
E. | Lime is added to water |
Answer» C. Alum is added to water |
327. | The total count of bacteria in portable water should not exceed |
A. | 5000 per c.c. |
B. | 998 per c.c. |
C. | 1 mg/litre |
D. | 10,000 per c.c. |
E. | 10 per c.c. |
Answer» E. 10 per c.c. |
328. | A blue smoke from a diesel engine indicates presence of |
A. | Unburnt carbon |
B. | Carbon monoxide |
C. | Unburnt oil |
D. | Nitrous oxide |
E. | Carbon dioxide |
Answer» C. Unburnt oil |
329. | For portable water the permissible pH value is |
A. | 11 — 14 |
B. | 7 – 8.5 |
C. | 4.5 – 7 |
D. | 9 — 11 |
E. | 1 – 4.5 |
Answer» B. 7 – 8.5 |
330. | Which of the following is the major source of environmental pollution in urban areas? |
A. | Rolling mills |
B. | Automobiles |
C. | Electronic industries |
D. | Power plants |
E. | Floor mills |
Answer» B. Automobiles |
331. | Which of the following is considered as the noble gas? |
A. | None of these |
B. | Hydrogen |
C. | Argon |
D. | Ozone |
E. | Oxygen |
Answer» C. Argon |
332. | Which of the following is an artificial source of energy? |
A. | Wood |
B. | Electricity |
C. | Sun |
D. | None of these |
E. | Coal |
Answer» B. Electricity |
333. | The hardness of soft water (in ppm) is |
A. | 0 – 50 |
B. | 200 – 350 |
C. | 50 – 150 |
D. | 375 – 500 |
E. | 500 – 1000 |
Answer» A. 0 – 50 |
334. | The process of removal of permanent hardness of water is |
A. | Filtration process |
B. | Zeolite process |
C. | Sedimentation process |
D. | Lime process |
E. | Boiling process |
Answer» B. Zeolite process |
335. | Which of the following measures the heat of combustion? |
A. | Beckmann’s thermometer |
B. | Thermostat |
C. | Green |
D. | Refrigerator |
E. | Bomb’s calorimeter |
Answer» E. Bomb’s calorimeter |
336. | For the maximum alkalinity of water, the pH value would be |
A. | 7 |
B. | Zero |
C. | 8 |
D. | 20 |
E. | 14 |
Answer» E. 14 |
337. | Zeolite is |
A. | Hydrated calcium silicate |
B. | A naturally occurring salt |
C. | Hydread silica |
D. | Hydrated alumino-silicate |
E. | Silicon carbide |
Answer» D. Hydrated alumino-silicate |
338. | Which of the following particles will be smallest in size? |
A. | Smog |
B. | Drizzle |
C. | Fog |
D. | Rain |
E. | Mist |
Answer» A. Smog |
339. | Thiosulphate is the antidote for the poisonous effect due to |
A. | Cyanide |
B. | Lead |
C. | Organic phosphorous compounds |
D. | Mercury |
E. | Arsenic |
Answer» A. Cyanide |
340. | The presence of algae in water indicates that the water is |
A. | Hard |
B. | Acidic |
C. | Soft |
D. | Pune |
E. | Free from turbidity |
Answer» B. Acidic |
341. | The maximum permissible turbidity for drinking water |
A. | 15 – 25 ppm |
B. | 3 – 50 ppm |
C. | 30 – 50 ppm |
D. | 1 – 4 ppm |
E. | Zero |
Answer» A. 15 – 25 ppm |
342. | Per capita consumption of water is usually taken as |
A. | 750 – 1000 litres |
B. | 50 – 100 litres |
C. | 500 – 750 litres |
D. | 400 – 500 litres |
E. | 150 – 300 litres |
Answer» E. 150 – 300 litres |
343. | The most injurious components of automobile exhaust for environment are |
A. | Green |
B. | Carbon monoxide and Carbon dioxide |
C. | Carbon monoxide and lead |
D. | Carbon dioxide and Sulphur dioxide |
E. | Ethylene dichloride and ethylene dibromide |
Answer» B. Carbon monoxide and Carbon dioxide |
344. | The main disadvantage of hard water is |
A. | Increased soap consumption |
B. | Bad taste |
C. | Foul smell |
D. | More turbidity |
E. | Higher density |
Answer» A. Increased soap consumption |
345. | The maximum permissible level or pesticides, in general, in drinking water is nearly |
A. | 50 to 100 ppm |
B. | 1 to 50 ppm |
C. | 100 to 250 ppm |
D. | 250 to 500 ppm |
E. | 500 to 1000 ppm |
Answer» B. 1 to 50 ppm |
346. | The emission of oxides of nitrogen in automobile exhaust will be least when the vehicle is |
A. | Accelerating |
B. | Idling |
C. | Cruising at high speed |
D. | Cruising at low speed |
E. | Decelerating |
Answer» B. Idling |
347. | Mottling of teeth is associated with the presence of |
A. | Fluorides in water |
B. | Calcium in water |
C. | Chloride in water |
D. | Sulphur in water |
E. | Sodium chloride in water |
Answer» A. Fluorides in water |
348. | Which of the following is the major source of flyash emission? |
A. | Sintering plants |
B. | Sulphuric acid plant |
C. | Power plants |
D. | Oil refineries |
E. | Blast furnace |
Answer» C. Power plants |
349. | Theodolite is used by |
A. | Electronic Engineers |
B. | Cartrographers |
C. | None of these |
D. | Physicists |
E. | Surveyors |
Answer» E. Surveyors |
350. | Water with least contamination can be be obtained from |
A. | Lakes |
B. | Spring along the hill slope |
C. | Wells |
D. | Reservoirs |
E. | Rivers |
Answer» B. Spring along the hill slope |
351. | Which of the following chemical is least poisonous? |
A. | Mercury |
B. | Cyanide |
C. | Arsenic |
D. | Lead |
E. | Sodium |
Answer» E. Sodium |
352. | Disinfection of drinking water means removal of |
A. | Bacteria |
B. | Colour |
C. | Odour |
D. | Turbidity |
E. | Oxygen |
Answer» A. Bacteria |
353. | The hardness limit for portable water ranges between |
A. | 10 – 50 ppm |
B. | 300 – 700 ppm |
C. | 75 – 117 ppm |
D. | 150 – 250 ppm |
E. | 50 – 65 ppm |
Answer» C. 75 – 117 ppm |
354. | The process used for the removal of dissolved carbondioxide from the water, is known as |
A. | Coagulation |
B. | Sedimentation |
C. | Aeration |
D. | Zeolitc |
E. | Agitation |
Answer» C. Aeration |
355. | Which of the following automobile will provide least pollution problems |
A. | Battery powered |
B. | Petrol engine powered |
C. | Gas turbine powered |
D. | Diesel engine powered |
E. | Wankel engine powered |
Answer» A. Battery powered |
356. | The permissible level of HCN in drinking water is |
A. | More than 50 mg/litre |
B. | Around 1 mg/litre |
C. | Less than 0.01 mg/litre |
D. | Between 10 to 20 mg/litre |
E. | Around 5 mg/litre |
Answer» C. Less than 0.01 mg/litre |
357. | The chloride content in the water for public supplies should not exceed |
A. | 1 mg/litre |
B. | 250 mg/litre |
C. | 50 mg/litre |
D. | 20 mg/litre |
E. | 100 mg/litre |
Answer» B. 250 mg/litre |
358. | The most frequent method of bacterial reproduction is by |
A. | The formation of spores |
B. | Budding |
C. | Cell division |
D. | Colony formation |
E. | Sexual process |
Answer» C. Cell division |
359. | Bit is the unit of |
A. | Quantity of electricity |
B. | Intensity of an earthquake |
C. | None of these |
D. | Memory of computer |
E. | Amount of rain recorded |
Answer» D. Memory of computer |
360. | Dark, black smoke from diesel engines usually results when engine is |
A. | Running at light loads |
B. | Running at slow speeds |
C. | Running at full load and full speed |
D. | Idling |
E. | Running at full speed but under load conditions |
Answer» C. Running at full load and full speed |
361. | Which one among the following terms best describes the method of converting a spherical surface into a plane surface? |
A. | Projection |
B. | Cartography |
C. | None of these |
D. | Geodesy |
E. | Photogrammetry |
Answer» A. Projection |
362. | The permissible hardness of water for public supplies is |
A. | 400 mg/litre |
B. | 10 mg/litre |
C. | 25 mg/litre |
D. | 75 mg/litre |
E. | 115 mg/litre |
Answer» E. 115 mg/litre |
363. | What will be the colour of red rose when it is seen through green glass? |
A. | Pink |
B. | White |
C. | Brown |
D. | Green |
E. | Black |
Answer» C. Brown |
364. | Identify the incorrect statement if any Zeolite process is suitable for |
A. | When zeolite becomes inactive, it may be reactivated by flushing with brine solution |
B. | Removing temporary hardness |
C. | Removing permanent hardness |
D. | Acidic waters |
E. | Cent percent removal of hardness |
Answer» D. Acidic waters |
365. | Which of the following constituent of air has the least percentage? |
A. | Helium |
B. | Carbon dioxide |
C. | Xenon |
D. | Neon |
E. | Argon |
Answer» C. Xenon |
366. | If with minimum quantity of potassium permanganate, the pink colour of water disappears soon, then it shows that |
A. | Water is hard |
B. | Water is acidic |
C. | Chlorine content is high in water |
D. | Water is alkaline |
E. | Organic matter is present in water |
Answer» E. Organic matter is present in water |
367. | Which one of the following gases shows a different behaviour at high pressure? |
A. | Ozone |
B. | Hydrogen |
C. | Carbon dioxide |
D. | Water vapours |
E. | None of these |
Answer» B. Hydrogen |
368. | Bleaching power is |
A. | Stacked lime |
B. | Hypo-chloride of lime |
C. | Chloride of lime |
D. | Hypo-chlorite of lime |
E. | Lime |
Answer» D. Hypo-chlorite of lime |
369. | The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is |
A. | 10 |
B. | 1 |
C. | 2 |
D. | 5 |
E. | 3 |
Answer» E. 3 |
370. | The percentage of nitrogen in air by weight is around |
A. | 24.3 percent |
B. | 23.1 percent |
C. | 65.5 percent |
D. | 75.5 percent |
E. | 20.3 percent |
Answer» D. 75.5 percent |
371. | What is a laser? |
A. | Electro-magnetic waves |
B. | Light amplification by stimulated emission of radiation |
C. | Supersonic waves |
D. | Green |
E. | Ultrasonic waves |
Answer» B. Light amplification by stimulated emission of radiation |
372. | The permissible hardness of water for low pressure boiler is |
A. | 150 mg/litre |
B. | 50 mg/litre |
C. | 350 kg/litre |
D. | 250 mg/litre |
E. | 450 mg/litre |
Answer» B. 50 mg/litre |
373. | To keep the water safe against pathogenetic bacteria the residual chlorine should remain between |
A. | 10 ppm to 20 ppm |
B. | 1 ppm to 2 ppm |
C. | 0.2 to 0.8 ppm |
D. | 0.05 to 0.2 ppm |
E. | 6 ppm to 10 ppm |
Answer» D. 0.05 to 0.2 ppm |
374. | Which of the following industry is least polluting? |
A. | Rolling mills |
B. | Oil refinery |
C. | Cement industry |
D. | Thermal power plants |
E. | Electronic industry |
Answer» E. Electronic industry |
375. | The pH value of sea water is usually |
A. | Between 3 and 5 |
B. | 1 |
C. | Between 8 and 8.3 |
D. | Between 13.7 and 14 |
E. | Between 5 and 7 |
Answer» C. Between 8 and 8.3 |
376. | The pH value of concentrated sulphuric acid could be expected between |
A. | 6 and 5 |
B. | 7 and 6 |
C. | 1 and 0 |
D. | 4 and 3 |
E. | 3 and 1 |
Answer» C. 1 and 0 |
377. | Ultra-violet rays are used for the treatment of water known as |
A. | Dechlorination |
B. | Aeration |
C. | Disinfection |
D. | Filtration |
E. | Bleaching |
Answer» C. Disinfection |
378. | The process of kolling at the pathogenic bacteria of water-borne diseases to make it safe for hospital use, is known as |
A. | Zeoliting |
B. | Debacterialisation |
C. | Chlorination |
D. | Aeration |
E. | Sterilization |
Answer» E. Sterilization |
379. | In one litre sample of drinking water the coliform organism should not exceed |
A. | 1 |
B. | 100 |
C. | 10 |
D. | 1000 |
E. | 500 |
Answer» C. 10 |
380. | Turbidity in water may be removed by |
A. | Aeration |
B. | Sedimentation |
C. | Oxidation |
D. | Filtration |
E. | Agitation |
Answer» B. Sedimentation |
381. | Which one of the following is not directly related to the phenomenon of evaporation? |
A. | None of these |
B. | Temperature of liquid |
C. | Surface winds over the liquid |
D. | Volume of the liquid |
E. | Surface area of the liquid |
Answer» D. Volume of the liquid |
382. | For the maximum acidity of water, pH value would be |
A. | 0.1 |
B. | 10 |
C. | 1 |
D. | 0.01 |
E. | 11 |
Answer» D. 0.01 |
383. | The process of passing the water through a thick layer of filtering media is known as |
A. | Sedimentation |
B. | Disinfection |
C. | Putrification |
D. | Filtration |
E. | Purification |
Answer» D. Filtration |
384. | In case of public supplies, the maximum permissible nitrite content is |
A. | 250 ppm |
B. | 100 ppm |
C. | 50 ppm |
D. | 200 ppm |
E. | zero ppm |
Answer» E. zero ppm |
385. | The presence of which of the following material in water is not considered to be dangerous? |
A. | Copper |
B. | Zinc |
C. | Mercury |
D. | Calcium |
E. | Lead |
Answer» D. Calcium |
386. | The desirable temperature of portable water is |
A. | 10?C |
B. | 37?C |
C. | 27?C |
D. | zero degree centigrade |
E. | 20?C |
Answer» A. 10?C |
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