McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 51. |
Control of river pollution can be done by providing the extra ___________ during dry season. |
| A. | Water |
| B. | Nitrogen |
| C. | Carbondioxide |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 52. |
Determination of flow increase is used for the monitoring of ___________ |
| A. | sea pollution |
| B. | River pollution |
| C. | Lake pollution |
| D. | Tank pollution |
| Answer» B. River pollution | |
| 53. |
which of the following does not include in the monitoring of river pollution? |
| A. | Assessing the immediate water quality |
| B. | Development activities in the region |
| C. | Determination of flow increase |
| D. | Colour of the water |
| Answer» D. Colour of the water | |
| 54. |
Which one of the following is the basic indicator of river health? |
| A. | BOD |
| B. | COD |
| C. | DO |
| D. | ThOD |
| Answer» C. DO | |
| 55. |
What is the minimum amount of DO required for the life survival of aquatic animals? |
| A. | 10 mg/l |
| B. | 5 mg/l |
| C. | 2 mg/l |
| D. | 1 mg/l |
| Answer» C. 2 mg/l | |
| 56. |
In the concept of self purification of natural streams, complete the following phrase. Solution to pollution is _________ |
| A. | Control |
| B. | Dilution |
| C. | Reuse |
| D. | Recycle |
| Answer» B. Dilution | |
| 57. |
_________ is accomplished by the replenishment of oxygen lost to bacterial degradation of organic waste. |
| A. | Gas transfer |
| B. | Dilution |
| C. | Filtration |
| D. | Re-suspension |
| Answer» A. Gas transfer | |
| 58. |
On which of the following does the self purification process does not depend? |
| A. | Volume |
| B. | Flow rate |
| C. | Temperature |
| D. | Aquatic species |
| Answer» D. Aquatic species | |
| 59. |
In a flowing stream, the breakdown of degradable wastes by bacteria ________ dissolved oxygen. |
| A. | Increases |
| B. | Depletes |
| C. | Maintains |
| D. | Improves |
| Answer» B. Depletes | |
| 60. |
What is the objective of water quality management? |
| A. | Control the discharge of pollutants |
| B. | Pollutants are discharged into flowing streams |
| C. | Selective pollutants are released |
| D. | Only highly toxic pollutants are released |
| Answer» A. Control the discharge of pollutants | |
| 61. |
The impact of pollution depends upon nature of the pollutants and the ___________ |
| A. | Toxic contaminants |
| B. | Season |
| C. | Contaminants |
| D. | Characteristics of river |
| Answer» D. Characteristics of river | |
| 62. |
Which of the following sewerage systems carry domestic and industrial wastewater? |
| A. | sanitary sewers |
| B. | storm sewers |
| C. | combined sewers |
| D. | storm and combined sewers |
| Answer» A. sanitary sewers | |
| 63. |
Which of the following is a strict anaerobe? |
| A. | Enterobacter |
| B. | Alcaligenes |
| C. | Pseudomonas |
| D. | Methanosarcina |
| Answer» D. Methanosarcina | |
| 64. |
In which of the following treatment involve oxidation of organic constituents of the wastewater? |
| A. | Primary treatment |
| B. | Secondary treatment |
| C. | Advanced treatment |
| D. | Final treatment |
| Answer» B. Secondary treatment | |
| 65. |
The upper region of the trickling filter is favorable for the growth of _____________ |
| A. | fungi |
| B. | protozoa |
| C. | algae |
| D. | bacteria |
| Answer» C. algae | |
| 66. |
Activated sludge usually employs an aeration period of ________________ |
| A. | 1 hour |
| B. | 24 hours |
| C. | 10-15 hours |
| D. | 4-8 hours |
| Answer» D. 4-8 hours | |
| 67. |
Trickling filter is used in which of the following wastewater treatment processes? |
| A. | Primary treatment |
| B. | Secondary treatment |
| C. | Advanced treatment |
| D. | Final treatment |
| Answer» B. Secondary treatment | |
| 68. |
Belt filter presses are used in which of the following process? |
| A. | Thickening |
| B. | Stabilization |
| C. | Dewatering |
| D. | Disposal |
| Answer» C. Dewatering | |
| 69. |
Which of the following gases are produced in large amounts during sludge digestion? |
| A. | methane |
| B. | carbon-dioxide |
| C. | hydrogen |
| D. | nitrogen |
| Answer» A. methane | |
| 70. |
Biological process is used to remove _______ |
| A. | Settleable solids |
| B. | Volatile solids |
| C. | Dissolved solids |
| D. | Colloids |
| Answer» C. Dissolved solids | |
| 71. |
What is the wastewater called as after physical and biological removal of solids? |
| A. | Primary effluent |
| B. | Primary treated water |
| C. | Secondary treated water |
| D. | Secondary treated wastewater |
| Answer» D. Secondary treated wastewater | |
| 72. |
What is the monthly concentration of solids produced by secondary sewage effluent? |
| A. | 20 mg/l |
| B. | 30 mg/l |
| C. | 40 mg/l |
| D. | 35 mg/l |
| Answer» B. 30 mg/l | |
| 73. |
What is the expected BOD removal after both primary and secondary treatment? |
| A. | 90% |
| B. | 85% |
| C. | 80% |
| D. | 75% |
| Answer» B. 85% | |
| 74. |
What is the percentage removal of BOD by stabilization ponds? |
| A. | 20% |
| B. | 45% |
| C. | 65% |
| D. | 95% |
| Answer» C. 65% | |
| 75. |
Which of these is not an advantage of a trickling filter? |
| A. | Temperature |
| B. | Construction cost |
| C. | Oxygen delivery |
| D. | Electric systems |
| Answer» A. Temperature | |
| 76. |
The secondary clarifiers are ________ |
| A. | Circular |
| B. | Rectangular |
| C. | Square |
| D. | Triangular |
| Answer» A. Circular | |
| 77. |
Which of the following is not commonly used as a filter material in the treatment of water? |
| A. | Sand |
| B. | Anthracite |
| C. | Crushed rock |
| D. | Garnet sand |
| Answer» C. Crushed rock | |
| 78. |
Which of the following is correct regarding the cheapest filter material used in water treatment? |
| A. | Sand>Anthracite>Garnet sand |
| B. | SandGarnet sand |
| C. | Sand |
| D. | Sand=Anthracite>Garnet sand |
| Answer» A. Sand>Anthracite>Garnet sand | |
| 79. |
The uniformity characteristics of sand expressed in terms of __________ |
| A. | Effective size |
| B. | Effective size and uniformity coefficient |
| C. | Uniformity coefficient |
| D. | Mean velocity |
| Answer» B. Effective size and uniformity coefficient | |
| 80. |
____ represents the size of sand particle such that 10% of particles are finer than this size. |
| A. | D0.1 |
| B. | D1 |
| C. | D10 |
| D. | D100 |
| Answer» C. D10 | |
| 81. |
What is CU in the expression CU= D60/D10 where D60 and D10 are the sizes of particle such that 60% and 10% of the particles are finer than these sizes respectively? |
| A. | Coefficient of compaction |
| B. | Coefficient of consolidation |
| C. | Uniformity coefficient |
| D. | Effective size |
| Answer» C. Uniformity coefficient | |
| 82. |
The effective size of sand of the slow sand filter is __________ |
| A. | 0.1-0.2mm |
| B. | 0.2-0.3mm |
| C. | 0.4-0.7mm |
| D. | 1-2mm |
| Answer» B. 0.2-0.3mm | |
| 83. |
What is the value of specific gravity of sand filter? |
| A. | 2 |
| B. | 2.6 |
| C. | 3.1 |
| D. | 3.5 |
| Answer» B. 2.6 | |
| 84. |
The value of uniformity coefficient for uniformly graded sand is ______ |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» B. 1 | |
| 85. |
The value of specific gravity for Garnet sand is ____ |
| A. | 2.1 |
| B. | 3.6 |
| C. | 4.2 |
| D. | 5.1 |
| Answer» C. 4.2 | |
| 86. |
Which of the following statement is correct? |
| A. | Ignition loss of filter should not exceed 3% |
| B. | Wearing loss of filter sand should not exceed 5% |
| C. | The range of CU for the slow sand filter is 3-5 |
| D. | The range of CU for the rapid sand filter is 3-5 |
| Answer» C. The range of CU for the slow sand filter is 3-5 | |
| 87. |
In which process of water softening, ion exchange phenomenon takes place? |
| A. | Lime soda process |
| B. | Zeolite process |
| C. | Boiling |
| D. | Demineralization process |
| Answer» B. Zeolite process | |
| 88. |
In which process of water softening, the chemicals are added to remove hardness from water? |
| A. | Lime soda process |
| B. | Zeolite process |
| C. | Boiling |
| D. | Demineralization process |
| Answer» A. Lime soda process | |
| 89. |
Zeolites are complex compound of ____________ |
| A. | Aluminium and lime |
| B. | Silica and soda |
| C. | Aluminium, silica and soda |
| D. | Lime and soda |
| Answer» C. Aluminium, silica and soda | |
| 90. |
The color of the artificial zeolite permutit is ____________ |
| A. | Grey |
| B. | Yellow |
| C. | Green |
| D. | White |
| Answer» D. White | |
| 91. |
Natural zeolite is mainly processed from ____________ |
| A. | White sand |
| B. | Green sand |
| C. | Grey sand |
| D. | Red sand |
| Answer» B. Green sand | |
| 92. |
The color of the natural zeolite is ____________ |
| A. | Green |
| B. | Grey |
| C. | Black |
| D. | Blue |
| Answer» A. Green | |
| 93. |
The chemical formula of Permutit is ____________ |
| A. | SiOAl2O3Na2O |
| B. | SiO2Al2O3Na2O |
| C. | SiO2Al2O3NaO |
| D. | SiO3Al2O3Na2O |
| Answer» B. SiO2Al2O3Na2O | |
| 94. |
Permutit has an exchange value of ________ grams of hardness per m3 of zeolite. |
| A. | 10,000 |
| B. | 20,000-30,000 |
| C. | 35,000-40,000 |
| D. | 40,000-50,000 |
| Answer» C. 35,000-40,000 | |
| 95. |
The thickness of the layers of filter sand of zeolite softener is ____________ |
| A. | 20cm |
| B. | 30cm |
| C. | 40cm |
| D. | 100cm |
| Answer» D. 100cm | |
| 96. |
Which of the following is a disadvantage of the zeolite process? |
| A. | No sludge is formed |
| B. | The process is almost automatic |
| C. | Suspended impurities get deposited around the zeolite particles |
| D. | Zero hardness can be occurred |
| Answer» C. Suspended impurities get deposited around the zeolite particles | |
| 97. |
Water is mainly used in boilers for the generation of ________________ |
| A. | Power |
| B. | Electricity |
| C. | Steam |
| D. | Current |
| Answer» C. Steam | |
| 98. |
Which of the following should not be a composition of boiler-feed water? |
| A. | Hardness should be below 0.2ppm |
| B. | Its caustic alkalinity should lie between 0.15 to 0.45 ppm |
| C. | Its soda alkalinity should be 0.45-1 ppm |
| D. | Its caustic alkalinity should be 1.5-2 ppm |
| Answer» D. Its caustic alkalinity should be 1.5-2 ppm | |
| 99. |
Which of the following is not a result of the excess of impurity in boiler-feed? |
| A. | Scale and sludge formation |
| B. | Decomposition |
| C. | Corrosion, priming and foaming |
| D. | Caustic embrittlement |
| Answer» B. Decomposition | |
| 100. |
If the precipitate formed is soft, loose and slimy, these are __________ and if the precipitate is hard and adhering on the inner wall, it is called _____________ |
| A. | Sludges, scale |
| B. | Scale, sludges |
| C. | Sludges, rodent |
| D. | Scale, rodent |
| Answer» A. Sludges, scale | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.