MCQOPTIONS
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MCQOPTIONS
This section includes 204 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 process of passing the water through a thick layer of filtering media is known as |
| A. | Sedimentation |
| B. | Disinfection |
| C. | Putrification |
| D. | Filtration |
| E. | Purification |
| Answer» E. Purification | |
| 52. |
In one litre sample of drinking water the coliform organism should not exceed |
| A. | 1 |
| B. | 100 |
| C. | 10 |
| D. | 1000 |
| E. | 500 |
| Answer» D. 1000 | |
| 53. |
For the maximum acidity of water, pH value would be |
| A. | 0.1 |
| B. | 10 |
| C. | 1 |
| D. | 0.01 |
| E. | 11 |
| Answer» E. 11 | |
| 54. |
Which of the following fuel has maximum resistance to detonation? |
| A. | Toulene |
| B. | Benzene |
| C. | Iso-octane |
| D. | n-heptane |
| E. | None of the above |
| Answer» D. n-heptane | |
| 55. |
Turbidity in water may be removed by |
| A. | Aeration |
| B. | Sedimentation |
| C. | Oxidation |
| D. | Filtration |
| E. | Agitation |
| Answer» C. Oxidation | |
| 56. |
Which one of the following gases shows a different behaviour at high pressure? |
| A. | Ozone |
| B. | Hydrogen |
| C. | Carbon dioxide |
| D. | Water vapours |
| E. | None of these |
| Answer» C. Carbon dioxide | |
| 57. |
Which one among the following terms best describes the method of converting a spherical surface into a plane surface? |
| A. | Projection |
| B. | Cartography |
| C. | None of these |
| D. | Geodesy |
| E. | Photogrammetry |
| Answer» B. Cartography | |
| 58. |
Bleaching power is |
| A. | Stacked lime |
| B. | Hypo-chloride of lime |
| C. | Chloride of lime |
| D. | Hypo-chlorite of lime |
| E. | Lime |
| Answer» E. Lime | |
| 59. |
Which of the following industry is least polluting? |
| A. | Rolling mills |
| B. | Oil refinery |
| C. | Cement industry |
| D. | Thermal power plants |
| E. | Electronic industry |
| Answer» F. | |
| 60. |
Which of the following constituent of air has the least percentage? |
| A. | Helium |
| B. | Carbon dioxide |
| C. | Xenon |
| D. | Neon |
| E. | Argon |
| Answer» D. Neon | |
| 61. |
The permissible level of HCN in drinking water is |
| A. | More than 50 mg/litre |
| B. | Around 1 mg/litre |
| C. | Less than 0.01 mg/litre |
| D. | Between 10 to 20 mg/litre |
| E. | Around 5 mg/litre |
| Answer» D. Between 10 to 20 mg/litre | |
| 62. |
What is a laser? |
| A. | Electro-magnetic waves |
| B. | Light amplification by stimulated emission of radiation |
| C. | Supersonic waves |
| D. | Green |
| E. | Ultrasonic waves |
| Answer» C. Supersonic waves | |
| 63. |
The permissible hardness of water for public supplies is |
| A. | 400 mg/litre |
| B. | 10 mg/litre |
| C. | 25 mg/litre |
| D. | 75 mg/litre |
| E. | 115 mg/litre |
| Answer» F. | |
| 64. |
Which of the following automobile will provide least pollution problems |
| A. | Battery powered |
| B. | Petrol engine powered |
| C. | Gas turbine powered |
| D. | Diesel engine powered |
| E. | Wankel engine powered |
| Answer» B. Petrol engine powered | |
| 65. |
To keep the water safe against pathogenetic bacteria the residual chlorine should remain between |
| A. | 10 ppm to 20 ppm |
| B. | 1 ppm to 2 ppm |
| C. | 0.2 to 0.8 ppm |
| D. | 0.05 to 0.2 ppm |
| E. | 6 ppm to 10 ppm |
| Answer» E. 6 ppm to 10 ppm | |
| 66. |
The most frequent method of bacterial reproduction is by |
| A. | The formation of spores |
| B. | Budding |
| C. | Cell division |
| D. | Colony formation |
| E. | Sexual process |
| Answer» D. Colony formation | |
| 67. |
Bit is the unit of |
| A. | Quantity of electricity |
| B. | Intensity of an earthquake |
| C. | None of these |
| D. | Memory of computer |
| E. | Amount of rain recorded |
| Answer» E. Amount of rain recorded | |
| 68. |
Disinfection of drinking water means removal of |
| A. | Bacteria |
| B. | Colour |
| C. | Odour |
| D. | Turbidity |
| E. | Oxygen |
| Answer» B. Colour | |
| 69. |
What will be the colour of red rose when it is seen through green glass? |
| A. | Pink |
| B. | White |
| C. | Brown |
| D. | Green |
| E. | Black |
| Answer» D. Green | |
| 70. |
Which of the following chemical is least poisonous? |
| A. | Mercury |
| B. | Cyanide |
| C. | Arsenic |
| D. | Lead |
| E. | Sodium |
| Answer» F. | |
| 71. |
The permissible hardness of water for low pressure boiler is |
| A. | 150 mg/litre |
| B. | 50 mg/litre |
| C. | 350 kg/litre |
| D. | 250 mg/litre |
| E. | 450 mg/litre |
| Answer» C. 350 kg/litre | |
| 72. |
The percentage of nitrogen in air by weight is around |
| A. | 24.3 percent |
| B. | 23.1 percent |
| C. | 65.5 percent |
| D. | 75.5 percent |
| E. | 20.3 percent |
| Answer» E. 20.3 percent | |
| 73. |
The chloride content in the water for public supplies should not exceed |
| A. | 1 mg/litre |
| B. | 250 mg/litre |
| C. | 50 mg/litre |
| D. | 20 mg/litre |
| E. | 100 mg/litre |
| Answer» C. 50 mg/litre | |
| 74. |
The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is |
| A. | 10 |
| B. | 1 |
| C. | 2 |
| D. | 5 |
| E. | 3 |
| Answer» F. | |
| 75. |
Identify the incorrect statement if any Zeolite process is suitable for |
| A. | When zeolite becomes inactive, it may be reactivated by flushing with brine solution |
| B. | Removing temporary hardness |
| C. | Removing permanent hardness |
| D. | Acidic waters |
| E. | Cent percent removal of hardness |
| Answer» E. Cent percent removal of hardness | |
| 76. |
The pH value of sea water is usually |
| A. | Between 3 and 5 |
| B. | 1 |
| C. | Between 8 and 8.3 |
| D. | Between 13.7 and 14 |
| E. | Between 5 and 7 |
| Answer» D. Between 13.7 and 14 | |
| 77. |
Dark, black smoke from diesel engines usually results when engine is |
| A. | Running at light loads |
| B. | Running at slow speeds |
| C. | Running at full load and full speed |
| D. | Idling |
| E. | Running at full speed but under load conditions |
| Answer» D. Idling | |
| 78. |
The hardness limit for portable water ranges between |
| A. | 10 - 50 ppm |
| B. | 300 - 700 ppm |
| C. | 75 - 117 ppm |
| D. | 150 - 250 ppm |
| E. | 50 - 65 ppm |
| Answer» D. 150 - 250 ppm | |
| 79. |
Which one of the following is not directly related to the phenomenon of evaporation? |
| A. | Temperature of liquid |
| B. | Volume of the liquid |
| C. | Surface area of the liquid |
| D. | Surface winds over the liquid |
| E. | None of these |
| Answer» C. Surface area of the liquid | |
| 80. |
Which of the following is a cold cathode lamp? |
| A. | Sodium vapour lamp |
| B. | High pressure mercury vapour lamp |
| C. | Low pressure mercury vapour lamp |
| D. | Neon lamp |
| E. | None of the above |
| Answer» E. None of the above | |
| 81. |
Which pollutants result from automobile exhaust? |
| A. | Carbon monoxide |
| B. | Nitrous oxide |
| C. | Hydrocarbons |
| D. | Sulphur dioxide |
| E. | All of the above |
| Answer» F. | |
| 82. |
A fuel of octane rating 85 matches the antiknock qualities of a mixture consisting of |
| A. | 85% petrol + 15% diesel |
| B. | 15% petrol + 85% diesel |
| C. | 85% benzene + 15% methyl chloride |
| D. | 85% octane + 15% heptane |
| E. | None of the above |
| Answer» E. None of the above | |
| 83. |
For controlling the growth of algae, the chemical generally used is |
| A. | Alum |
| B. | Lime |
| C. | Bleaching powder |
| D. | Copper sulphate |
| E. | Ozone |
| Answer» E. Ozone | |
| 84. |
Corrosive action of water could be due to its |
| A. | alkalinity |
| B. | hardness |
| C. | dissolved oxygen |
| D. | Any of the above |
| E. | None of the above |
| Answer» E. None of the above | |
| 85. |
Which of the following shading device will transmit least leat inside a room? |
| A. | Plain glass sheet 3 mm thick |
| B. | Plain glass sheet with wire mesh outside |
| C. | Plain glass sheet with Venetion blind inside |
| D. | Plain glass with curtain inside |
| E. | None of the above |
| Answer» E. None of the above | |
| 86. |
Which of the following can have octane rating of more than 100? |
| A. | Gobar gas |
| B. | Methyl alcohol |
| C. | Benzol |
| D. | Ethyl alcohol |
| E. | None of the above |
| Answer» D. Ethyl alcohol | |
| 87. |
The desirable temperature inside an air conditioned auditorium is |
| A. | 0?C |
| B. | 5?C |
| C. | 10?C |
| D. | 20?C |
| E. | None of the above |
| Answer» E. None of the above | |
| 88. |
The speed of sound through human body is around |
| A. | 344 m/s |
| B. | 688 m/s |
| C. | 1560 m/s |
| D. | 3120 m/s |
| E. | None of the above |
| Answer» D. 3120 m/s | |
| 89. |
Which of the following engines uses two fuels simulataneously? |
| A. | Multifuel engine |
| B. | Wankel engines |
| C. | Free piston gas generator |
| D. | Dual fuel engines |
| E. | None of the above |
| Answer» E. None of the above | |
| 90. |
All of the following pollutants are produced as a result of decaying organic matter EXCEPT |
| A. | Ammonia |
| B. | Sulphur dioxide |
| C. | Methane |
| D. | Hydrogen sulphide |
| E. | None of the above |
| Answer» C. Methane | |
| 91. |
The flouride content in the drinking water should not exceed |
| A. | 200 mg/litre |
| B. | 150 mg/litre |
| C. | 100 mg/litre50 mg/litre |
| D. | 50 mg/litre |
| E. | 1 mg/litre |
| Answer» F. | |
| 92. |
The anitdote for the poisonous effects due to mercury, is |
| A. | Vitamin K |
| B. | BAL |
| C. | Thiosulphate |
| D. | Altropine |
| E. | Any of the above |
| Answer» C. Thiosulphate | |
| 93. |
Out of the following metals the least permissible percentage in drinking water is |
| A. | Chromium |
| B. | Copper |
| C. | Zinc |
| D. | Lead |
| E. | None of the above |
| Answer» B. Copper | |
| 94. |
On board ships, the source of drinking water may be |
| A. | Rain water |
| B. | Sea water |
| C. | Desalted sea water |
| D. | Pumped deep sea water |
| E. | Any of the above |
| Answer» D. Pumped deep sea water | |
| 95. |
Which thermometer is used to indicate the lowest temperature? |
| A. | Clinical thermometer |
| B. | Alcohol thermometer |
| C. | Resistance thermometer |
| D. | Liquid thermometer |
| E. | Green |
| Answer» C. Resistance thermometer | |
| 96. |
The first aid for a victim of electric shock is |
| A. | bandage |
| B. | sprinkling of water on the face |
| C. | glass of milk and cold water |
| D. | artificial respiration |
| E. | None of the above |
| Answer» E. None of the above | |
| 97. |
Prechlorination |
| A. | Improves coagulation |
| B. | Reduces odours |
| C. | Reduces organisms |
| D. | All of the above |
| E. | None of the above |
| Answer» F. | |
| 98. |
In the jet propulsion, efficiency of the propulstion depends upon |
| A. | The speed of the vehicle |
| B. | Height at which the vehicle is travelling |
| C. | Density of the medium in which the vehicle is travelling |
| D. | All of the above |
| E. | Green |
| Answer» D. All of the above | |
| 99. |
The unit parts per million is identical to |
| A. | Grains per galleon |
| B. | Pounds per cubic foot |
| C. | Milligrams per kg |
| D. | Tonnes peracre foot |
| E. | None of the above |
| Answer» D. Tonnes peracre foot | |
| 100. |
If with minimum quantity of potassium permanganate, the pink colour of water disappears soon, then it shows that |
| A. | Water is hard |
| B. | Water is acidic |
| C. | Chlorine content is high in water |
| D. | Water is alkaline |
| E. | Organic matter is present in water |
| Answer» F. | |