MCQOPTIONS
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MCQOPTIONS
This section includes 112 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. |
The detention period of a lime soda treatment plant is ____________ |
| A. | 1hour |
| B. | 3hours |
| C. | 2-4hours |
| D. | 4-7hours |
| Answer» D. 4-7hours | |
| 52. |
By which process, odour producing substances is oxidized? |
| A. | Chlorination |
| B. | Liming |
| C. | Re-carbonation |
| D. | Super-chlorination |
| Answer» E. | |
| 53. |
Which of the following is a carbonaceous material? |
| A. | Charcoal |
| B. | Petroleum |
| C. | Hydrogen sulfide |
| D. | Sodium chloride |
| Answer» B. Petroleum | |
| 54. |
The Total hardness of soft water as CaCO₃ equivalent is __________ |
| A. | 50ppm |
| B. | 100ppm |
| C. | 150ppm |
| D. | 200ppm |
| Answer» B. 100ppm | |
| 55. |
The total hardness of water is 100ppm as CaCO₃ equivalent. What is the type of water? |
| A. | Soft |
| B. | Moderately hard |
| C. | Hard |
| D. | Very hard |
| Answer» C. Hard | |
| 56. |
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» D. Zero hardness can be occurred | |
| 57. |
Which of the following method is not used for desalination? |
| A. | Distillation |
| B. | Coagulation |
| C. | Reverse osmosis |
| D. | Freezing |
| Answer» B. Coagulation | |
| 58. |
The dose of activated carbon in powdered form is controlled by ____________ |
| A. | Chromatography |
| B. | Distillation |
| C. | Threshold odor test |
| D. | MPN test |
| Answer» D. MPN test | |
| 59. |
The process in which the brackish water is forced across a permeable membrane by mechanical forces is called as _____________ |
| A. | Filtration |
| B. | Semi filtration |
| C. | Coagulation |
| D. | Hyper filtration |
| Answer» E. | |
| 60. |
The taste produced by a microorganism, can be controlled by ____________ |
| A. | Potassium per-manganate |
| B. | Potassium dichromate |
| C. | Sodium chloride |
| D. | Iodine |
| Answer» B. Potassium dichromate | |
| 61. |
The temporary hardness in water is due to the presence of __________ |
| A. | Sulfates, Chlorides |
| B. | Sulfates, Chlorides, nitrates |
| C. | Carbonates and bicarbonates |
| D. | Sulfates and carbonates |
| Answer» D. Sulfates and carbonates | |
| 62. |
What happens when water contains 8-20 ppm of fluoride concentration? |
| A. | Blue baby disease |
| B. | Crippling fluorosis |
| C. | Dental fluorosis |
| D. | Mottling of teeth |
| Answer» C. Dental fluorosis | |
| 63. |
The reduction of carbon dioxide by cascade aerators is in the range of __________ |
| A. | 10-20% |
| B. | 20-30% |
| C. | 40-50% |
| D. | 50-60% |
| Answer» E. | |
| 64. |
Which of the following is not used as a fluoride compound? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» E. | |
| 65. |
The minimum reaction time allowed in the recarbonation basin is ____________ |
| A. | 5minutes |
| B. | 10minutes |
| C. | 15minutes |
| D. | 20minutes |
| Answer» E. | |
| 66. |
Which of the following is not used for removing the permanent hardness? |
| A. | Lime soda process |
| B. | Zeolite process |
| C. | Demineralization |
| D. | Adding lime |
| Answer» E. | |
| 67. |
Dealkalization results in removal of all the ions from the water. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 68. |
The coarse screen is inclined at _____ to facilitate the cleaning or raking. |
| A. | 300 |
| B. | 350 |
| C. | 450 |
| D. | 900 |
| Answer» D. 900 | |
| 69. |
The permanent hardness is also known as __________ |
| A. | Pseudo hardness |
| B. | Non carbonate hardness |
| C. | Carbonate hardness |
| D. | Brinell hardness |
| Answer» C. Carbonate hardness | |
| 70. |
The elapsed time in gravity filter is 1sec. What is the height of fall in a single descent? |
| A. | 4.4m |
| B. | 4.9m |
| C. | 8.8m |
| D. | 9.8m |
| Answer» C. 8.8m | |
| 71. |
For removal of manganese from water ________ mg of oxygen is required. |
| A. | 0.14 |
| B. | 0.50 |
| C. | 0.29 |
| D. | 0.90 |
| Answer» D. 0.90 | |
| 72. |
As far as safer handling is considered, which of the following is used for fluoridation? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» D. Sodium fluro carbonate | |
| 73. |
Which of the following is the pure compound? |
| A. | Sodium fluoride |
| B. | Sodium silico fluoride |
| C. | Hydrofluosilicic acid |
| D. | Sodium fluro carbonate |
| Answer» B. Sodium silico fluoride | |
| 74. |
Multistage flash evaporator produces _____ kg of water per kg of prime steam. |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» E. | |
| 75. |
The time required for the mixing of lime and soda in lime soda process is _____________ |
| A. | 10min |
| B. | 20min |
| C. | 40min |
| D. | 80 min |
| Answer» D. 80 min | |
| 76. |
Fluorides in solution form are preferred over powdered form for fluoridation. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 77. |
What is the dose of copper sulfate required for the treatment of water? |
| A. | 0.3-0.6ppm |
| B. | 2-6ppm |
| C. | 4-8ppm |
| D. | 10-20ppm |
| Answer» B. 2-6ppm | |
| 78. |
Activated carbon in powder form is applied in the mixing basin. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 79. |
The process of reducing the fluoride content from water is called _____ |
| A. | Chlorination |
| B. | Fluoridation |
| C. | Defluoridation |
| D. | Flocculation |
| Answer» D. Flocculation | |
| 80. |
In which process of water softening, ion exchange phenomenon takes place? |
| A. | Lime soda process |
| B. | Zeolite process |
| C. | Boiling |
| D. | Demineralization process |
| Answer» C. Boiling | |
| 81. |
Removal of iron from water takes place at a pH of ______ |
| A. | 1.5 |
| B. | 3 |
| C. | 8.2 |
| D. | 9.4 |
| Answer» E. | |
| 82. |
The color of the natural zeolite is ____________ |
| A. | Green |
| B. | Grey |
| C. | Black |
| D. | Blue |
| Answer» B. Grey | |
| 83. |
The permanent hardness in water is due to the presence of __________ |
| A. | Sulfates, Chlorides |
| B. | Sulfates, chlorides, nitrates |
| C. | Carbonates and bicarbonates |
| D. | Sulfates and carbonates |
| Answer» C. Carbonates and bicarbonates | |
| 84. |
Due to the Aswan dam in Egypt, the countries cultivated area has been increased to |
| A. | 4-8 % |
| B. | 3-5% |
| C. | 4-7% |
| D. | 2-5% |
| Answer» B. 3-5% | |
| 85. |
There are protozoa present in the water. Its name is Dinobryen. What is the dose of copper sulfate required to kill it? |
| A. | 0.02ppm |
| B. | 0.3ppm |
| C. | 0.5ppm |
| D. | 0.8ppm |
| Answer» C. 0.5ppm | |
| 86. |
Which organism is the carrier of sleeping sickness disease? |
| A. | Snail |
| B. | Tsetse Fly |
| C. | Guinea worm |
| D. | Fly |
| Answer» C. Guinea worm | |
| 87. |
Which chemical is used for removing the permanent hardness of Calcium chloride? |
| A. | Lime |
| B. | Chlorine |
| C. | Soda |
| D. | Both lime and soda |
| Answer» C. Soda | |
| 88. |
In which desalination process, the salt ions are removed from seawater by means of electric current? |
| A. | Distillation |
| B. | Electro-dialysis |
| C. | Reverse osmosis |
| D. | Freezing |
| Answer» C. Reverse osmosis | |
| 89. |
The brown tinge in the water is due to the presence of ____________ |
| A. | Zinc |
| B. | Copper |
| C. | Iron |
| D. | Manganese |
| Answer» E. | |
| 90. |
The maximum salt concentration up to which desalination of brackish water is possible by Electro-dialysis is _____________ |
| A. | 1000ppm |
| B. | 2000ppm |
| C. | 3000ppm |
| D. | 5000ppm |
| Answer» E. | |
| 91. |
The solar evaporation can yield about ___ kg of fresh water per day per m² of basin surface. |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» B. 10 | |
| 92. |
Which of the following regarding ozonation is incorrect? |
| A. | Improves the appearance of water |
| B. | Removes traces of color |
| C. | Remove odor |
| D. | Remove phenolic and algae taste |
| Answer» E. | |
| 93. |
Fluorex is a special mixture of ____________ |
| A. | Di-calcium phosphate and carbon |
| B. | Tri-calcium phosphate and hydroxyapatite |
| C. | Di-calcium phosphate and phosphoric acid |
| D. | Tri-calcium phosphate and carbon |
| Answer» C. Di-calcium phosphate and phosphoric acid | |
| 94. |
The zeolite process is unsuitable for water containing iron and manganese. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 95. |
Iron and Manganese are generally present in water supplies as ____________ |
| A. | Suspension |
| B. | Solution |
| C. | Colloidal particles |
| D. | Either suspension or solution |
| Answer» E. | |
| 96. |
By which process dissolved manganese compounds can be converted into insoluble manganese compounds? |
| A. | Aeration |
| B. | Coagulation |
| C. | Sedimentation |
| D. | Flocculation |
| Answer» B. Coagulation | |
| 97. |
In which process, excess lime is converted into bicarbonate? |
| A. | Chlorination |
| B. | Liming |
| C. | Re-carbonation |
| D. | Super-chlorination |
| Answer» D. Super-chlorination | |
| 98. |
Micro strainers are used to remove color in water. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 99. |
Granular activated carbon has a surface area of ____________ |
| A. | 100-200m²/g |
| B. | 500-1400m²/g |
| C. | 400-600m²/g |
| D. | 500-900m²/g |
| Answer» C. 400-600m²/g | |
| 100. |
Which material is used in contact filters for the removal of fluorides? |
| A. | Calcium phosphate |
| B. | Copper sulfate |
| C. | Synthetic tri-calcium phosphate |
| D. | Bone charcoal |
| Answer» D. Bone charcoal | |