MCQOPTIONS
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MCQOPTIONS
This section includes 227 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the ________________? |
| A. | Catalytic conversion |
| B. | Green house effect |
| C. | Global warming |
| D. | Both B. and C. |
| Answer» E. | |
| 52. |
The earth’s atmosphere is an envelope of gases present upto a height of about ______________ kms? |
| A. | 10 |
| B. | 200 |
| C. | 1000 |
| D. | 2000 |
| Answer» C. 1000 | |
| 53. |
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water? |
| A. | Dissolved oxygen content |
| B. | Biological oxygen demand |
| C. | Vapor pressure |
| D. | All A., B. and C. |
| Answer» B. Biological oxygen demand | |
| 54. |
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________? |
| A. | Ionosphere |
| B. | Troposphere |
| C. | Stratosphere |
| D. | None of these |
| Answer» C. Stratosphere | |
| 55. |
The concentration of water vapour in troposphere, which depends upon the altitude & temperature, varies in the range of zero to ______________ percent? |
| A. | 1 |
| B. | 4 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 56. |
The common pollutant generated in chlor-alkali industry and battery manufacture is ___________________? |
| A. | Mercury |
| B. | Brine |
| C. | Phosphate |
| D. | None of these |
| Answer» B. Brine | |
| 57. |
The biological decomposition of organic substances in wastes controlled conditions is called_________________? |
| A. | Incineration |
| B. | Biological oxidation |
| C. | Composting |
| D. | None of these |
| Answer» D. None of these | |
| 58. |
The average thickness of ozone layer in stratosphere is about _______________ dobson unit (DU)? |
| A. | 20 |
| B. | 230 |
| C. | 750 |
| D. | 1500 |
| Answer» C. 750 | |
| 59. |
The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated? |
| A. | Decreases |
| B. | Increases |
| C. | Remain constant |
| D. | May increase or decrease; depends on the chemical characteristics of polluted water |
| Answer» B. Increases | |
| 60. |
Scale formation in boiler is controlled by____________________? |
| A. | Preheating of feed water |
| B. | Reduction in hardness, silica & alumina in feed water |
| C. | Keeping the pH value of feed water just below 7 |
| D. | Eliminating H2S in feed water |
| Answer» C. Keeping the pH value of feed water just below 7 | |
| 61. |
Salt content in sea water is about ______________ percent? |
| A. | 0.5 |
| B. | 1 |
| C. | 3.5 |
| D. | 9.05 |
| Answer» D. 9.05 | |
| 62. |
‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________? |
| A. | Industrial chimney exhaust |
| B. | Automobiles exhaust |
| C. | Photochemical reaction in polluted atmosphere |
| D. | Burning of domestic fuel |
| Answer» C. Photochemical reaction in polluted atmosphere | |
| 63. |
Ringelmann chart No. 2 corresponds to _______________ percent black smoke? |
| A. | 10 |
| B. | 20 |
| C. | 40 |
| D. | 80 |
| Answer» D. 80 | |
| 64. |
Ringelmann chart is used for the evaluation of _____________ pollution? |
| A. | Air |
| B. | Water |
| C. | Noise |
| D. | Radioactive |
| Answer» B. Water | |
| 65. |
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________? |
| A. | Natural aeration of water stream |
| B. | Photosynthetic action of algae |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 66. |
Removal of ______________ results from the disinfection of water? |
| A. | Turbidity |
| B. | Odour |
| C. | Hardness |
| D. | Bacteria |
| Answer» E. | |
| 67. |
Removal of ______________ is accomplished by aeration of water? |
| A. | Dissolved gases |
| B. | Suspended solids |
| C. | Dissolved solids |
| D. | None of these |
| Answer» B. Suspended solids | |
| 68. |
Radioactive substances present in the polluted water stream can be removed by_________________? |
| A. | Biological oxygen treatment |
| B. | Coagulation and filtration |
| C. | Adsorption in ion exchange materials |
| D. | None of these |
| Answer» D. None of these | |
| 69. |
Radioactive solid nuclear wastes are disposed off by _________________? |
| A. | High temperature incineration |
| B. | Pathological incineration |
| C. | Pyrolysis |
| D. | Underground burial in concrete containers |
| Answer» E. | |
| 70. |
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________? |
| A. | Explosion |
| B. | Non biodegradable foam |
| C. | Undesirable plant growth |
| D. | Corrosion |
| Answer» B. Non biodegradable foam | |
| 71. |
Presence of soluble organics in polluted water causes_________________? |
| A. | Undesirable plants growth |
| B. | Depletion of oxygen |
| C. | Fire hazards |
| D. | Explosion hazards |
| Answer» C. Fire hazards | |
| 72. |
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes_______________? |
| A. | Foaming |
| B. | Odour nuisances |
| C. | Undesirable plant growth |
| D. | Turbidity |
| Answer» D. Turbidity | |
| 73. |
Presence of nitrates in water in excess of 50 ppm causes________________? |
| A. | Methemoglobinemia |
| B. | Gastroenteritis |
| C. | Asphyxiation |
| D. | Tooth decay |
| Answer» B. Gastroenteritis | |
| 74. |
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent? |
| A. | 84 |
| B. | 88 |
| C. | 80 |
| D. | 92 |
| Answer» B. 88 | |
| 75. |
Presence of iron and manganese in water causes___________________? |
| A. | Reduction in its dissolved oxygen content |
| B. | Discoloration of bathroom fixtures |
| C. | Temporary hardness |
| D. | None of these |
| Answer» C. Temporary hardness | |
| 76. |
Presence of ____________ in water stream are deleterious to aquatic life? |
| A. | Soluble and toxic organics |
| B. | Suspended solids |
| C. | Heavy metals and cyanides |
| D. | All A., B. & C. |
| Answer» E. | |
| 77. |
Presence of _____________ hardness is responsible for the temporary hardness in water? |
| A. | Carbonate |
| B. | Calcium |
| C. | Chloride |
| D. | Sulphate |
| Answer» C. Chloride | |
| 78. |
Presence of high concentration of ozone and smog in atmospheric air causes the __________________? |
| A. | Embrittlement & decrease of folding resistance of paper |
| B. | Cracking of rubber products |
| C. | Fading of dye on textiles |
| D. | Damage of electrical insulator on high tension power line |
| Answer» C. Fading of dye on textiles | |
| 79. |
Presence of excess fluorine in water causes__________________? |
| A. | Dental cavity |
| B. | Tooth decay |
| C. | Fluorosis |
| D. | Respiratory disease |
| Answer» D. Respiratory disease | |
| 80. |
Presence of dissolved impurities of ______________ is responsible for the red brownish color of water? |
| A. | Carbonates |
| B. | Bi-carbonates |
| C. | Iron & manganese |
| D. | Arsenic |
| Answer» D. Arsenic | |
| 81. |
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ? |
| A. | Acts as a green house gas thereby raising earth’s temperature |
| B. | Causes asphyxia |
| C. | Causes increase in sea level |
| D. | Enhances the green house effect |
| Answer» C. Causes increase in sea level | |
| 82. |
Presence of bacteria in potable (drinking) water causes_________________? |
| A. | Turbidity |
| B. | Disease |
| C. | Bad odour |
| D. | Bad taste & colour |
| Answer» C. Bad odour | |
| 83. |
Presence of _____________ bacteria in water causes disease like typhoid? |
| A. | Aerobic |
| B. | Pathogenic |
| C. | Anaerobic |
| D. | Non-pathogenic |
| Answer» C. Anaerobic | |
| 84. |
Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent___________________? |
| A. | Dental cavities |
| B. | Scale formation |
| C. | Water-borne disease |
| D. | Corrosion |
| Answer» B. Scale formation | |
| 85. |
Polyvinyl chloride containers are not suitable for storing_________________? |
| A. | Foodstuffs |
| B. | Woolen clothes |
| C. | Metallic powder |
| D. | None of these |
| Answer» B. Woolen clothes | |
| 86. |
Pollution by particulate matter emission in the atmosphere does not take place during metal____________________? |
| A. | Grinding |
| B. | Machining |
| C. | Cutting |
| D. | Polishing |
| Answer» E. | |
| 87. |
‘Pneumoconiosis’ is a disease caused by the inhalation of ______________ dust? |
| A. | Coal |
| B. | Uranium ore |
| C. | Iron ore |
| D. | Lime |
| Answer» B. Uranium ore | |
| 88. |
_____________ plant emits large amount of SO2 as an air pollutant? |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Chlor alkali |
| D. | Iron & steel |
| Answer» C. Chlor alkali | |
| 89. |
Pick out the wrong statement pertaining to ‘green house’ for the plants ? |
| A. | ‘Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) to pass through the glass an |
| B. | The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house |
| C. | ‘Green house effect’ in earth’s atmosphere is due to increasing CO2 level in atmosphere, where CO2 acts like the glass of ‘green house’ ther |
| D. | ‘Green house’ is colder than the outside atmosphere |
| Answer» E. | |
| 90. |
Pick out the wrong statement. A. Caustic embrittlement of boiler’s metallic parts is caused by high concentration of caustic soda in boiler feed water___________________? |
| A. | Cooling and freezing of water kills the bacteria present in it |
| B. | With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing |
| C. | Dissolved oxygen content in high pressure boiler feed water should be nil |
| D. | None of these |
| Answer» B. With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing | |
| 91. |
Pick out the one which is not a chemical coagulant ? |
| A. | Aluminium sulphate |
| B. | Ferrous sulphate |
| C. | Hydrated lime |
| D. | Chloramine |
| Answer» E. | |
| 92. |
Pick out the correct statement ? |
| A. | Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present in water |
| B. | COD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature f |
| C. | COD is related to BOD of a given waste in water but the relationship varies for different wastes. Typically COD of potable water may be 1-2 mg/litre |
| D. | All A., B. and C. |
| Answer» E. | |
| 93. |
Photochemical smog is formed from automobile exhaust ________________? |
| A. | By reaction of hydrocarbon & nitric oxide in presence of sunlight |
| B. | Appears only on sunny days |
| C. | Is harmful for crops and trees also besides causing eye irritation & asthma |
| D. | All A., B. & C. |
| Answer» E. | |
| 94. |
Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by_________________? |
| A. | Quenching of hot coke |
| B. | Discharging in the river stream |
| C. | Filtration and recycling for cooling coke oven gas |
| D. | None of these |
| Answer» B. Discharging in the river stream | |
| 95. |
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by_______________? |
| A. | Chlorination |
| B. | Treating in biological oxygen pond |
| C. | Chemical coagulation |
| D. | None of these |
| Answer» C. Chemical coagulation | |
| 96. |
Persons working in cement plants and limestone quarries are more prone to disease like__________________? |
| A. | Cancer |
| B. | Asthma |
| C. | Silicosis |
| D. | Fluorosis (bone disease) |
| Answer» D. Fluorosis (bone disease) | |
| 97. |
Peroxyacetyl nitrate (PAN), a pollutant is found in the_________________? |
| A. | Automobile exhaust |
| B. | Flue gas of coal based power plant |
| C. | Exhaust of nitric acid plant |
| D. | Exhaust of sulphuric acid plant |
| Answer» B. Flue gas of coal based power plant | |
| 98. |
Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)? |
| A. | Highly |
| B. | Moderately |
| C. | Extremely |
| D. | Very extremely |
| Answer» C. Extremely | |
| 99. |
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called_________________? |
| A. | Fumes |
| B. | Mists |
| C. | Smoke |
| D. | Aerosols |
| Answer» E. | |
| 100. |
‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a „particulate‟ ? |
| A. | Dust & mists |
| B. | Smoke & fumes |
| C. | Photochemical smog & soot |
| D. | None of these |
| Answer» E. | |