MCQOPTIONS
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MCQOPTIONS
This section includes 180 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What is the color of the surface coating formed during the filtration process? |
| A. | White |
| B. | Brown |
| C. | Green |
| D. | Reddish brown |
| Answer» E. | |
| 52. |
The under drainage system in pressure consists of __________ |
| A. | Central drains connected to lateral drain |
| B. | Wheeler system |
| C. | Wagner system |
| D. | Pipe grids, false bottom |
| Answer» E. | |
| 53. |
In the ________ zone of purification in filter media, bacteria oxidizes the organic matter completely. |
| A. | Autotrophic |
| B. | Heterotrophic |
| C. | Schmutzdecke |
| D. | Electrolytic |
| Answer» C. Schmutzdecke | |
| 54. |
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 | |
| 55. |
The size of Anthracite used in dual media filter is __________ |
| A. | 1-2mm |
| B. | 1.25-2.5mm |
| C. | 3-4mm |
| D. | 4-5mm |
| Answer» C. 3-4mm | |
| 56. |
Which material is provided for the up flow bed in dual media bi-flow filter? |
| A. | Anthracite |
| B. | Sand |
| C. | Rice husk |
| D. | Graphite |
| Answer» C. Rice husk | |
| 57. |
What is the value of the uniformity coefficient in a rapid sand filter? |
| A. | 1 |
| B. | 1.5 |
| C. | 2 |
| D. | 2.5 |
| Answer» C. 2 | |
| 58. |
The thickness of the suspended matter on top of the sand bed is __________ |
| A. | Directly proportional to head loss |
| B. | Inversely proportional to head loss |
| C. | Independent of the head loss |
| D. | Directly proportional to the square of head loss |
| Answer» B. Inversely proportional to head loss | |
| 59. |
When the impurities are separated by the gravitation of settling particles, the operation is called ______ |
| A. | Sedimentation with coagulant |
| B. | Plain sedimentation |
| C. | Secondary sedimentation |
| D. | Disinfection |
| Answer» C. Secondary sedimentation | |
| 60. |
The depth of an enclosed tank of a rapid sand filter lies in the range of ______ |
| A. | 1-2m |
| B. | 2.5-3.5m |
| C. | 2-5m |
| D. | 3-5m |
| Answer» C. 2-5m | |
| 61. |
The head loss through the bed of solids of the filter can be determined by __________ |
| A. | Carmen-Kozney equation |
| B. | Rose equation |
| C. | Carmen-Kozney and Rose equation |
| D. | Charles equation |
| Answer» D. Charles equation | |
| 62. |
In mixed media filter, the filtration is done from ______ |
| A. | Fine to finer |
| B. | Coarse to coarser |
| C. | Fine to coarse |
| D. | Coarse to fine |
| Answer» E. | |
| 63. |
How the performance of the rapid sand filter can be improved? |
| A. | Replacing the top 15 cm layer of sand with Anthracite |
| B. | Replacing the bottom15 cm layer of sand with Anthracite |
| C. | Increasing the thickness of a layer of sand |
| D. | Replacing 15 cm layer of Anthracite with sand |
| Answer» B. Replacing the bottom15 cm layer of sand with Anthracite | |
| 64. |
The slow sand filter is efficient in removing turbidity of water. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 65. |
In which type of filter, the filtration is done in two opposite directions at the same time? |
| A. | Dual media filter |
| B. | Mixed media filter |
| C. | Bi-flow filter |
| D. | Rapid sand filter |
| Answer» D. Rapid sand filter | |
| 66. |
Which material is provided for the down-flow bed in dual media bi-flow filter? |
| A. | Coal sand |
| B. | Garnet sand |
| C. | Rice husk |
| D. | Graphite |
| Answer» B. Garnet sand | |
| 67. |
The effective size of a rapid sand filter is ______ |
| A. | 0.45mm |
| B. | 0.7mm |
| C. | 0.8mm |
| D. | 0.9mm |
| Answer» B. 0.7mm | |
| 68. |
The turbidity of water applied to rapid sand filter is less than _______ |
| A. | 35-40ppm |
| B. | 10-20ppm |
| C. | 30-40ppm |
| D. | 10-15ppm |
| Answer» B. 10-20ppm | |
| 69. |
Consider the following statement.i. The slow sand filter is not efficient in removing turbidityii. The slow sand filter has a high initial costiii. Skilled supervision is required in slow sand filterWhich of the above statement is/are correct? |
| A. | Only iii |
| B. | i, ii |
| C. | i, ii, iii |
| D. | ii, iii |
| Answer» C. i, ii, iii | |
| 70. |
What is the size of sand used in a dual media filter? |
| A. | 0.5-1mm |
| B. | 1-2mm |
| C. | 2-3mm |
| D. | 3.5-4mm |
| Answer» B. 1-2mm | |
| 71. |
What is the thickness of a layer of a diatomite filter? |
| A. | 1mm |
| B. | 2mm |
| C. | 3mm |
| D. | 4mm |
| Answer» D. 4mm | |
| 72. |
Which of the following order is correct regarding the specific gravity of the materials used in the mixed media filter? |
| A. | Anthracite coal < Sand > Garnet sand |
| B. | Anthracite coal > Sand > Garnet sand |
| C. | Anthracite coal = Sand = Garnet sand |
| D. | Anthracite coal < Sand < Garnet sand |
| Answer» E. | |
| 73. |
How is the grain size distribution of sand in rapid sand filter? |
| A. | Stratified |
| B. | Unlayered |
| C. | Layered with heaviest grains at the top |
| D. | Layered with lightest grains at the top |
| Answer» E. | |
| 74. |
In which type of filter, rate of filtration is low? |
| A. | Slow sand filter |
| B. | Rapid sand filter |
| C. | Gravity filter |
| D. | Pressure filter |
| Answer» B. Rapid sand filter | |
| 75. |
When the fineness of sand increases __________ |
| A. | The bacterial efficiency increases |
| B. | The rate of filtration increases |
| C. | The rate of filtration first decrease, then increase |
| D. | The bacterial efficiency remains constant |
| Answer» B. The rate of filtration increases | |
| 76. |
What is the range of pressure in pressure filter? |
| A. | 1-5 kg/cm² |
| B. | 2-5 kg/cm² |
| C. | 3-7 kg/cm² |
| D. | 1-8 kg/cm² |
| Answer» D. 1-8 kg/cm² | |
| 77. |
Which of the following has the highest shape factor as stated by Carmen? |
| A. | Ottawa sand |
| B. | Pulverized coal |
| C. | Rounded coal |
| D. | Angular sand |
| Answer» B. Pulverized coal | |
| 78. |
Which of the following is the best filter in terms of rate of filtration? |
| A. | Pressure filter |
| B. | Rapid sand filter |
| C. | Dual media filter |
| D. | Mixed media filter |
| Answer» E. | |
| 79. |
The loss of head during cleaning operation of a rapid sand filter is __________ |
| A. | 15-30cm |
| B. | 1-5cm |
| C. | 10-20cm |
| D. | 10-25cm |
| Answer» B. 1-5cm | |
| 80. |
Consider the following statement.i. Slow sand filter is not flexible in variation in demandii. The rapid sand filter is flexible in fluctuations in demandiii. The method of cleaning of a slow sand filter involves agitation and back-washingWhich of the above statement is/are correct? |
| A. | i, ii |
| B. | i, ii, iii |
| C. | ii, iii |
| D. | Only iii |
| Answer» B. i, ii, iii | |
| 81. |
In which type of under drainage system of rapid sand filter, laterals are provided with strainers? |
| A. | Perforated pipe system |
| B. | Pipe and strainer system |
| C. | Wheeler system |
| D. | Wagner system |
| Answer» C. Wheeler system | |
| 82. |
Which of the following is the expression of the Rose equation where symbols have their usual meanings? |
| A. | hf = f* (L/(s *d)) * ((1-e) /e³) * (v²/g) |
| B. | hf = f* (L/(s *d)) * ((1-e) /e³) * (v/g) |
| C. | hf = f* (L/(s *d)) * ((1-e) /e⁴) * (v²/g) |
| D. | hf = f* (L/(s *d)) * ((1-e) /e²) * (v²/g) |
| Answer» B. hf = f* (L/(s *d)) * ((1-e) /e³) * (v/g) | |
| 83. |
Which type of filter is used in treating swimming pool water? |
| A. | Slow sand filter |
| B. | Rapid sand filter |
| C. | Dual media filter |
| D. | Pressure filter |
| Answer» E. | |
| 84. |
The test for finding the optimum coagulant dose in water is ____________ |
| A. | Chromatography |
| B. | Jar test |
| C. | Kjeldahl test |
| D. | Dilatancy test |
| Answer» C. Kjeldahl test | |
| 85. |
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» C. Uniformity coefficient | |
| 86. |
What is the maximum filter head up to which slow sand filters are worked upon? |
| A. | 25cm |
| B. | 50cm |
| C. | 75cm |
| D. | 100cm |
| Answer» D. 100cm | |
| 87. |
Which is the first zone of purification in a sand bed? |
| A. | Autotrophic zone |
| B. | Heterotrophic zone |
| C. | Schmutzdecke zone |
| D. | Electrolytic zone |
| Answer» D. Electrolytic zone | |
| 88. |
What is the specific gravity of Anthracite used in a dual media filter? |
| A. | 1 |
| B. | 1.4 |
| C. | 2.4 |
| D. | 4.2 |
| Answer» C. 2.4 | |
| 89. |
Which of the following statement is wrong regarding Anthracite? |
| A. | It requires less water |
| B. | It is less inert to caustic solutions than sand |
| C. | It is more costly per tonne than sand |
| D. | It is used in industrial filters. |
| Answer» C. It is more costly per tonne than sand | |
| 90. |
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. | |
| 91. |
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 | |
| 92. |
What is the desirable value of mean velocity gradient in a flocculator? |
| A. | 20-50sec⁻¹ |
| B. | 20-75sec⁻¹ |
| C. | 50-100sec⁻¹ |
| D. | 30-50sec⁻¹ |
| Answer» C. 50-100sec⁻¹ | |
| 93. |
What is the dimension formula of mean velocity gradient? |
| A. | 1/T |
| B. | 1/T² |
| C. | T |
| D. | T² |
| Answer» B. 1/T² | |
| 94. |
In which type of sedimentation, flocculent suspension of intermediate concentration takes place? |
| A. | Type I sedimentation |
| B. | Type II sedimentation |
| C. | Type III sedimentation |
| D. | Type IV sedimentation |
| Answer» D. Type IV sedimentation | |
| 95. |
In which settling type, dilute suspension of particles takes place? |
| A. | Zone settling |
| B. | Compression settling |
| C. | Hindered settling |
| D. | Discrete settling |
| Answer» D. Discrete settling | |
| 96. |
In which type of sedimentation, flocculent suspension of high concentration takes place? |
| A. | Type I sedimentation |
| B. | Type II sedimentation |
| C. | Type III sedimentation |
| D. | Type IV sedimentation |
| Answer» E. | |
| 97. |
When impurities are separated by the gravitation of settling particles, the operation is called _____ |
| A. | Sedimentation with coagulant |
| B. | Plain sedimentation |
| C. | Secondary sedimentation |
| D. | Disinfection |
| Answer» C. Secondary sedimentation | |
| 98. |
Which of the following represents the impeller shaft in the following figure? |
| A. | F |
| B. | E |
| C. | C |
| D. | B |
| Answer» B. E | |
| 99. |
‘C’ in the following figure represents the ________ |
| A. | Impeller |
| B. | Impeller shaft |
| C. | Deflecting wall |
| D. | Flash mixer wall |
| Answer» D. Flash mixer wall | |
| 100. |
The speed of impeller in a flash mixer is ___________ |
| A. | 45rpm |
| B. | 60rpm |
| C. | 110rpm |
| D. | 200rpm |
| Answer» D. 200rpm | |