McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
| 51. |
In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater? |
| A. | flocculent settling |
| B. | hindered settling |
| C. | compression settling |
| D. | discrete settling |
| Answer» C. compression settling | |
| 52. |
In which settling type, dilute suspension of particles takes place? |
| A. | zone settling |
| B. | compression settling |
| C. | hindered settling |
| D. | discrete settling |
| Answer» C. hindered settling | |
| 53. |
What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10-3cm. Given G=2.65, viscosity v=8 * 10-3cm2/Sec? |
| A. | 0.01cm/sec |
| B. | 0.13cm/sec |
| C. | 0.24cm/sec |
| D. | 0.36cm/sec |
| Answer» B. 0.13cm/sec | |
| 54. |
The average time required by water to pass through the settling tank is called |
| A. | detention time |
| B. | flow through period |
| C. | time of flow |
| D. | mean time |
| Answer» B. flow through period | |
| 55. |
In preliminary treatment of sewage, the operation which takes place, is |
| A. | removal of fine suspended particles |
| B. | removal of fine dissolved organic material |
| C. | removal of lighter floating material |
| D. | removal of harmful bacterias and other organisms |
| Answer» C. removal of lighter floating material | |
| 56. |
How many types of aerators are commonly used in the treatment of wastewater? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» A. 2 | |
| 57. |
The detention period of detritus tank is |
| A. | 40 seconds |
| B. | 1 minute |
| C. | 3 minute |
| D. | 1 hour |
| Answer» C. 3 minute | |
| 58. |
How many types of trickling filters are used in sewage treatment? |
| A. | 1 |
| B. | 5 |
| C. | 3 |
| D. | 2 |
| Answer» D. 2 | |
| 59. |
The depth of the filter media of intermittent filter is |
| A. | 45cm |
| B. | 60cm |
| C. | 20cm |
| D. | 25cm |
| Answer» B. 60cm | |
| 60. |
Which of the following filter is used in the anaerobic treatment of sewage? |
| A. | intermittent sand |
| B. | trickling filter |
| C. | contact filter |
| D. | biological filter |
| Answer» D. biological filter | |
| 61. |
The maximum size of filter media of a percolating filter is |
| A. | 10mm |
| B. | 25mm |
| C. | 60mm |
| D. | 75mm |
| Answer» D. 75mm | |
| 62. |
The recirculation ratio for the low rate trickling filter is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» D. 0 | |
| 63. |
The BOD after the filtration of sewage from the low rate trickling filter is |
| A. | 40-50% |
| B. | 80-90% |
| C. | 70-80% |
| D. | 90-99% |
| Answer» B. 80-90% | |
| 64. |
The efficiency of a percolating filter is given by |
| A. | 100/(1+0.0044 (??)) |
| B. | 100/(1+0.044 (??) 1/2) |
| C. | 100/(1+0.44 (??) 1/2) |
| D. | 100/(1+0.0044 (??) 1/2) |
| Answer» D. 100/(1+0.0044 (??) 1/2) | |
| 65. |
The organic loading in low rate trickling filter is 900 kg/hectare- meter/day. What is the efficiency of the filter? |
| A. | 0.431 |
| B. | 0.883 |
| C. | 0.0704 |
| D. | 0.83 |
| Answer» B. 0.883 | |
| 66. |
The color of the secondary sludge produced from the high rate trickling filter is |
| A. | gray |
| B. | black |
| C. | brown |
| D. | green |
| Answer» C. brown | |
| 67. |
is the ratio of volume of recirculated sewage to the raw sewage. |
| A. | recirculation factor |
| B. | recirculation ratio |
| C. | food to mass ratio |
| D. | bod |
| Answer» B. recirculation ratio | |
| 68. |
The size of filter media in a high rate trickling filter is |
| A. | 10-20mm |
| B. | 34-68mm |
| C. | 25-60mm |
| D. | 20-50mm |
| Answer» C. 25-60mm | |
| 69. |
Which of the following is called as air diffusion method? |
| A. | activated sludge aeration |
| B. | diffused air aeration |
| C. | mechanical aeration |
| D. | combined aeration |
| Answer» B. diffused air aeration | |
| 70. |
The maximum depth of aeration tank used in activated sludge process is |
| A. | 1m |
| B. | 2m |
| C. | 4.5m |
| D. | 5.5m |
| Answer» C. 4.5m | |
| 71. |
Which type of reactor is used for mixing chemicals in water treatment? |
| A. | continuous reactor |
| B. | batch reactor |
| C. | plug flow reactor |
| D. | fixed bed reactor |
| Answer» B. batch reactor | |
| 72. |
Which reactors are characterized by non- continuous reactions? |
| A. | plug flow reactor |
| B. | continuous reactor |
| C. | batch reactor |
| D. | fluidized bed reactor |
| Answer» C. batch reactor | |
| 73. |
SBR is a type of |
| A. | aerobic process |
| B. | activated sludge process |
| C. | anaerobic process |
| D. | chemical process |
| Answer» B. activated sludge process | |
| 74. |
How is mixing done in SBR? |
| A. | manual |
| B. | mechanical |
| C. | air stripping |
| D. | agitation by air |
| Answer» B. mechanical | |
| 75. |
In which stage of the SBR is aeration performed? |
| A. | first |
| B. | second |
| C. | third |
| D. | fourth |
| Answer» B. second | |
| 76. |
Which of the following is an anaerobic process for treating sewage? |
| A. | oxidation pond |
| B. | imhoff tank |
| C. | oxidation ditch |
| D. | rotating biological contactors |
| Answer» B. imhoff tank | |
| 77. |
The minimum design depth of oxidation pond is |
| A. | 0.3m |
| B. | 0.5m |
| C. | 1m |
| D. | 1.5m |
| Answer» C. 1m | |
| 78. |
The detention period of oxidation pond is |
| A. | 12-36 hours |
| B. | 4 hours |
| C. | 10-20 days |
| D. | 30-60 seconds |
| Answer» C. 10-20 days | |
| 79. |
The maximum BOD removal efficiency of an oxidation pond is |
| A. | 0.9 |
| B. | 0.68 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» A. 0.9 | |
| 80. |
What is the minimum depth of water to be kept in the oxidation pond? |
| A. | 0.3m |
| B. | 0.5m |
| C. | 1 m |
| D. | 1.5m |
| Answer» C. 1 m | |
| 81. |
What is the shape of the oxidation ditch? |
| A. | square |
| B. | rectangular |
| C. | circular |
| D. | oval |
| Answer» D. oval | |
| 82. |
The ditch is lined by layer. |
| A. | brick |
| B. | cement |
| C. | permeable |
| D. | impermeable |
| Answer» D. impermeable | |
| 83. |
What is the range of MLSS concentration in oxidation ditch? |
| A. | 500-1000 mg/l |
| B. | 1000-2000 mg/l |
| C. | 2000-4000 mg/l |
| D. | 3000-5000 mg/l |
| Answer» D. 3000-5000 mg/l | |
| 84. |
Which of the following process is not adopted in oxidation ditches? |
| A. | adsorption |
| B. | desorption |
| C. | oxidation |
| D. | decomposition |
| Answer» B. desorption | |
| 85. |
The disposal of sewage from the septic tank is done by which of the following? |
| A. | clarifier |
| B. | soak pit |
| C. | aerated lagoon |
| D. | lamp holes |
| Answer» B. soak pit | |
| 86. |
The detention period of a septic tank is |
| A. | 2 hours |
| B. | 12-36 hours |
| C. | 4 hours |
| D. | 1 week |
| Answer» B. 12-36 hours | |
| 87. |
The concentration of biodegradable organic matter after the septic tank is |
| A. | 50ppm |
| B. | 100ppm |
| C. | 200ppm |
| D. | 75ppm |
| Answer» C. 200ppm | |
| 88. |
What is the maximum design flow of sewage in a septic tank? |
| A. | 70 liters per person per day |
| B. | 100 liters per person per day |
| C. | 30 liters per person per day |
| D. | 40 liters per person per day |
| Answer» A. 70 liters per person per day | |
| 89. |
Which of the following is not the method of disposal of sewage from septic tank? |
| A. | upflow anaerobic filter |
| B. | soil absorption system |
| C. | vacuum filter |
| D. | biological filters |
| Answer» C. vacuum filter | |
| 90. |
The minimum depth of septic tank as per design consideration is |
| A. | 1.8m |
| B. | 1m |
| C. | 1.2m |
| D. | 1.5m |
| Answer» C. 1.2m | |
| 91. |
The efficiency of a percolating filter is given by |
| A. | 100/(1+0.0044 (μ)) |
| B. | 100/(1+0.044 (μ) 1/2) |
| C. | 100/(1+0.44 (μ) 1/2) |
| D. | 100/(1+0.0044 (μ) 1/2) |
| Answer» D. 100/(1+0.0044 (μ) 1/2) | |
| 92. |
Turbidity of water is usually measured in terms of |
| A. | Sodium scale |
| B. | Silica scale |
| C. | Cobalt scale |
| D. | Platinum scale |
| E. | Calcium scale |
| Answer» B. Silica scale | |
| 93. |
Which of the following pollutant affects lungs? |
| A. | Silica |
| B. | Benzene |
| C. | Lead |
| D. | Aldrin |
| E. | None of the above |
| Answer» A. Silica | |
| 94. |
Black holes are celestial bodies which |
| A. | Have strong magentic field |
| B. | Have strong electrical field |
| C. | Do not allow any light to escape outside |
| D. | Are self luminous bodies |
| E. | Green |
| Answer» C. Do not allow any light to escape outside | |
| 95. |
The emission of carbon monoxide in automobile exhaust will be low when the vehicle is |
| A. | idling |
| B. | accelerating |
| C. | cruising at low speeds |
| D. | cruising at high speeds |
| E. | None of the above |
| Answer» D. cruising at high speeds | |
| 96. |
Temporary hardness in water in caused by salts like |
| A. | Sulphates |
| B. | Nitrates |
| C. | Chlorides |
| D. | Carbonates |
| E. | All of the above |
| Answer» D. Carbonates | |
| 97. |
The colour of water is measured |
| A. | In ferms of pH value |
| B. | In terms of degree of hardness |
| C. | In terms of platinum cobalt scale |
| D. | ppm of dissolved solids |
| E. | None of the above |
| Answer» C. In terms of platinum cobalt scale | |
| 98. |
Air pollutants common to urban environments are |
| A. | sulphur dioxide |
| B. | particulate matter |
| C. | Hydrocarbons |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 99. |
Ionisation chamber can be used for the detection of all of the following EXCEPT |
| A. | beta rays |
| B. | X-rays |
| C. | gamma rays |
| D. | Alpha rays |
| E. | None of the above |
| Answer» D. Alpha rays | |
| 100. |
Which of the following is used in the recently developed technology for communication? |
| A. | Optical fibre |
| B. | Glass fibre |
| C. | Nylon fibre |
| D. | Quartz fibre |
| E. | None of these |
| Answer» A. Optical fibre | |
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