MCQOPTIONS
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MCQOPTIONS
This section includes 182 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The aeration system will decrease the redox potential of the water. |
| A. | true |
| B. | false |
| Answer» C. | |
| 52. |
What is the tank volume of aeration for water flow of 50m3/h? |
| A. | 40 m3 |
| B. | 50 m3 |
| C. | 80 m3 d) 100 m3 |
| Answer» C. 80 m3 d) 100 m3 | |
| 53. |
What is the minimum time of aeration? |
| A. | 20 minutes |
| B. | 40 minutes |
| C. | 60 minutes |
| D. | 80 minutes |
| Answer» D. 80 minutes | |
| 54. |
At what pH should the water be maintained? |
| A. | 6.5 |
| B. | 7.5 |
| C. | 8.5 |
| D. | 9 |
| Answer» C. 8.5 | |
| 55. |
What is the permitted concentration of arsenic in drinking water? |
| A. | 10 g/l |
| B. | 20 g/l |
| C. | 30 g/l |
| D. | 40 g/l |
| Answer» B. 20 g/l | |
| 56. |
What is the permitted concentration of manganese in drinking water? |
| A. | 30 g/l |
| B. | 40 g/l |
| C. | 50 g/l |
| D. | 60 g/l |
| Answer» D. 60 g/l | |
| 57. |
For obtaining Silica |
| A. | sba followed by mixed be |
| B. | sba |
| C. | wba sba followed by mixed bed |
| D. | mixed bed |
| Answer» B. sba | |
| 58. |
What is the preferred regenerant in case of anion exchanger? |
| A. | nacl |
| B. | naoh |
| C. | na2so4 |
| D. | na2co3 |
| Answer» C. na2so4 | |
| 59. |
In which year was the Ferrosand process patented? |
| A. | 1960 |
| B. | 1965 |
| C. | 1970 |
| D. | 1975 |
| Answer» C. 1970 | |
| 60. |
In case along with silica, there is high content in sulphide and chloride what should be used? |
| A. | wba |
| B. | wba and sba |
| C. | sba |
| D. | sba,wba and wac |
| Answer» C. sba | |
| 61. |
What is the preferred regenerant in case of cation exchanger? |
| A. | hcl |
| B. | h2so4 |
| C. | h2co3 |
| D. | hf |
| Answer» B. h2so4 | |
| 62. |
When the hardness and alkalinity are around 30% what should be used? |
| A. | sac |
| B. | wac |
| C. | wac, sac |
| D. | wac, sac, wba |
| Answer» D. wac, sac, wba | |
| 63. |
When is strong basic anion not necessary? |
| A. | silica is nil |
| B. | co2 is nil |
| C. | fluroine is nil |
| D. | sulphate is nil |
| Answer» B. co2 is nil | |
| 64. |
While designing the demineralisation plant what is considered as the weak basic anion load? |
| A. | alkaline hardness |
| B. | alkaline hardness + ema |
| C. | ema |
| D. | silica |
| Answer» D. silica | |
| 65. |
While designing the demineralisation plant what is considered as the strong basic anion load? |
| A. | alkaline hardness |
| B. | alkaline hardness + ema+co2 |
| C. | ema+silica |
| D. | silica+co2+ alkalinity+ema |
| Answer» E. | |
| 66. |
While designing the demineralisation plant what is considered as the strong acidic cation load? |
| A. | alkaline hardness |
| B. | alkaline hardness + ema |
| C. | ema |
| D. | silica |
| Answer» C. ema | |
| 67. |
While designing the demineralisation plant what is considered as the weak acidic cation load? |
| A. | alkaline hardness |
| B. | alkaline hardness+ ema |
| C. | ema |
| D. | silica |
| Answer» B. alkaline hardness+ ema | |
| 68. |
Which of these have a negative electrical charge? |
| A. | calcium |
| B. | magnesium |
| C. | sodium |
| D. | chloride |
| Answer» E. | |
| 69. |
The ions with opposite charge can be exchanged. |
| A. | true |
| B. | false |
| Answer» C. | |
| 70. |
Ion exchange units are known as |
| A. | water hardeners |
| B. | water softeners |
| C. | water purifiers |
| D. | exchangers |
| Answer» C. water purifiers | |
| 71. |
Water softener units work most efficiently with particulate water. |
| A. | true |
| B. | false |
| Answer» C. | |
| 72. |
In which type of tube settler, tubes are slightly inclined in the direction of normal flow? |
| A. | solid contact clarifier |
| B. | steeply inclined tube settler |
| C. | vertical tube settler |
| D. | horizontal tube settler |
| Answer» E. | |
| 73. |
Which device solved the problem of unstable hydraulic conditions and operation of sludge removal equipment? |
| A. | centrifugal pump |
| B. | pulsator clarifier |
| C. | tube settler |
| D. | flocculator |
| Answer» D. flocculator | |
| 74. |
In which device, the primary mixing is followed by a secondary reaction zone resulting in formation of sludge blanket? |
| A. | centrifugal pump |
| B. | flocculator |
| C. | tube settler |
| D. | solid contact clarifier |
| Answer» E. | |
| 75. |
The pulsator clarifier is a type of |
| A. | horizontal flow sludge tank |
| B. | vertical flow sludge tank |
| C. | circular sludge tank |
| D. | plain sedimentation tank |
| Answer» C. circular sludge tank | |
| 76. |
What is the detention period of a clarifier used in the treatment of water? |
| A. | 1hour |
| B. | 2hours |
| C. | 3hours |
| D. | 4hours |
| Answer» D. 4hours | |
| 77. |
The design value of the velocity of flow in a flocculator is |
| A. | 0.2-0.8m/s |
| B. | 0.3-0.5m/s |
| C. | 0.6-0.8m/s |
| D. | 0.1-0.5m/s |
| Answer» B. 0.3-0.5m/s | |
| 78. |
What is the normal value of the detention period adopted in a flocculator for design purpose? |
| A. | 30min |
| B. | 60min |
| C. | 90min |
| D. | 100min |
| Answer» B. 60min | |
| 79. |
What is the dimension formula of mean velocity gradient? |
| A. | 1/t |
| B. | 1/t2 |
| C. | t |
| D. | t2 |
| Answer» B. 1/t2 | |
| 80. |
                     is an operation designed to force agitation in the fluid and induce coagulation. |
| A. | sedimentation |
| B. | flocculation |
| C. | disinfection |
| D. | aeration |
| Answer» C. disinfection | |
| 81. |
Organic contaminants are removed from the water by the process of |
| A. | water softening |
| B. | demineralization |
| C. | absorption |
| D. | adsorption |
| Answer» E. | |
| 82. |
Dealkalization results in removal of all the ions from the water. |
| A. | true |
| B. | false |
| Answer» C. | |
| 83. |
Solids are removed from the water by which of the following unit operation? |
| A. | inter facial contact |
| B. | solid stabilization |
| C. | ion transfer |
| D. | solids transfer |
| Answer» E. | |
| 84. |
By which process, odour producing substances is oxidized? |
| A. | chlorination |
| B. | liming |
| C. | re-carbonation |
| D. | super-chlorination |
| Answer» E. | |
| 85. |
In which process, excess lime is converted into bicarbonate? |
| A. | chlorination |
| B. | liming |
| C. | re-carbonation |
| D. | super-chlorination |
| Answer» D. super-chlorination | |
| 86. |
Which form of solute stabilization occurs when water passes through limestone? |
| A. | chlorination |
| B. | liming |
| C. | re-carbonation |
| D. | super-chlorination |
| Answer» C. re-carbonation | |
| 87. |
In which form of solute stabilization, hydrogen sulfide in water is oxidized into sulfate? |
| A. | chlorination |
| B. | liming |
| C. | re-carbonation |
| D. | super-chlorination |
| Answer» B. liming | |
| 88. |
In which unit operation objectionable solutes are converted into unobjectionable forms without removal? |
| A. | gas transfer |
| B. | ion transfer |
| C. | solute stabilization |
| D. | solids transfer |
| Answer» D. solids transfer | |
| 89. |
Flocculation of iron from water by the addition of lime is an example of which of the following process? |
| A. | chemical precipitation |
| B. | chemical coagulation |
| C. | ion exchange |
| D. | adsorption |
| Answer» B. chemical coagulation | |
| 90. |
Which of the following process is used to remove the colloidal particles from water? |
| A. | chemical precipitation |
| B. | chemical coagulation |
| C. | ion exchange |
| D. | adsorption |
| Answer» C. ion exchange | |
| 91. |
How many types of aerators are commonly used in the treatment of water? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 92. |
In which unit operation, gases are released or absorbed in the water? |
| A. | gas transfer |
| B. | ion transfer |
| C. | solute stabilization |
| D. | solids transfer |
| Answer» B. ion transfer | |
| 93. |
Which type of pump is used while handling the sludge disposal system? |
| A. | screw pump |
| B. | multistage pump |
| C. | self-priming pump |
| D. | vertical pump |
| Answer» B. multistage pump | |
| 94. |
In an activated sludge process which type of pump is used to recirculate the sludge? |
| A. | booster pump |
| B. | centrifugal pump |
| C. | vane pump |
| D. | vertical turbine pump |
| Answer» C. vane pump | |
| 95. |
Which type of pump should be selected in order to pump the sewage from a septic tank to the water treatment system? |
| A. | vertical sump pump |
| B. | progressive cavity pump |
| C. | submersible pump |
| D. | screw pump |
| Answer» D. screw pump | |
| 96. |
Which type of pump should be used in order to handle low viscosity fluids? |
| A. | centrifugal pump |
| B. | displacement pump |
| C. | submersible pump |
| D. | end suction pump |
| Answer» B. displacement pump | |
| 97. |
Which pump among the ones mentioned below can be located above the suction reservoir without an external priming system? |
| A. | slurry pumps |
| B. | self-priming pumps |
| C. | submersible pumps |
| D. | trash pumps |
| Answer» C. submersible pumps | |
| 98. |
End suction pumps are the common type of                    pumps. |
| A. | drum pumps |
| B. | centrifugal pumps |
| C. | positive displacement pumps |
| D. | grinder pumps |
| Answer» C. positive displacement pumps | |
| 99. |
Which type of pump is designed to handle rocks and other solids? |
| A. | trash pumps |
| B. | submersible pumps |
| C. | slurry pumps |
| D. | self-priming pumps |
| Answer» B. submersible pumps | |
| 100. |
Why are cryogenic pumps used? |
| A. | boost pressure |
| B. | handle low temperature liquids |
| C. | handle high temperature liquids |
| D. | pump small quantities of liquids |
| Answer» C. handle high temperature liquids | |