| 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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