MCQOPTIONS
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MCQOPTIONS
This section includes 444 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
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 and heat up the soil thereby warming up plants inside it |
| 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' thereby warming up the earth's surface |
| D. | 'Green house' is colder than the outside atmosphere |
| Answer» E. | |
| 102. |
The principal gas evolved from sludge digestion tank is |
| A. | CO |
| B. | CO₂ |
| C. | CH₄ |
| D. | N₂ |
| Answer» D. N₂ | |
| 103. |
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr. |
| A. | 10 to 20 |
| B. | 100 to 200 |
| C. | 1500 to 2500 |
| D. | 4000 to 5000 |
| Answer» C. 1500 to 2500 | |
| 104. |
Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m²/hr. |
| A. | 0.1 to 1 |
| B. | 3 to 6 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» C. 10 to 15 | |
| 105. |
The commonest form of iron & manganese found in ground water as pollutant is in the form of their |
| A. | Carbonates |
| B. | Bi-carbonates |
| C. | Chlorides |
| D. | Sulphides |
| Answer» C. Chlorides | |
| 106. |
In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.) |
| A. | t = 15 - 0.0065h |
| B. | t = 15 + 0.0065h |
| C. | t = 0.0035h -15 |
| D. | t = 15 - 0.0035h |
| Answer» B. t = 15 + 0.0065h | |
| 107. |
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent |
| A. | Dental cavities |
| B. | Scale formation |
| C. | Water-borne disease |
| D. | Corrosion |
| Answer» B. Scale formation | |
| 108. |
Which of the following sources is responsible for maximum air pollution? |
| A. | Industrial chimney exhaust |
| B. | Forest fire |
| C. | Automobiles exhaust |
| D. | Photochemical oxidation of organic matter |
| Answer» D. Photochemical oxidation of organic matter | |
| 109. |
Which of the following is not a practical method of low level radioactive waste disposal? |
| A. | Dilution with inert material |
| B. | Discharging to atmosphere through tall stacks after dilution |
| C. | Disposing off in rivers & oceans |
| D. | Filling in steel crates and shooting it off out of earth |
| Answer» E. | |
| 110. |
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 | |
| 111. |
Which of the following is a secondary air pollutant? |
| A. | Photochemical smog |
| B. | Sulphur dioxide |
| C. | Nitrogen dioxide |
| D. | Dust particles |
| Answer» B. Sulphur dioxide | |
| 112. |
Which is a secondary air pollutant? |
| A. | Photochemical smog |
| B. | Sulphur dioxide |
| C. | Nitrogen dioxide |
| D. | Dust particles |
| Answer» B. Sulphur dioxide | |
| 113. |
Disinfection of water is done to remove |
| A. | Color |
| B. | Bad taste |
| C. | Foul odour |
| D. | Bacteria |
| Answer» E. | |
| 114. |
The widest explosive limit is of __________ , thereby making it the most explosive gas. |
| A. | Acetylene |
| B. | Petrol vapor |
| C. | Hydrogen |
| D. | Carbon monoxide |
| Answer» B. Petrol vapor | |
| 115. |
Which of the following is the most widely used disinfectant in water treatment? |
| A. | Chlorine |
| B. | Irradiation of water by ultraviolet light |
| C. | Cation exchanger |
| D. | Coagulation |
| Answer» B. Irradiation of water by ultraviolet light | |
| 116. |
Iron & manganese present as pollutant in water can not be removed by |
| A. | Ion exchange process |
| B. | Oxidation followed by settling & filtration |
| C. | Lime soda process or manganese zeolite process |
| D. | Chlorination |
| Answer» E. | |
| 117. |
Corrosion in boilers can be prevented by |
| A. | Deaeration of feed water |
| B. | Enhancing pH of feed water by adding alkali |
| C. | Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion |
| D. | All of the above |
| Answer» E. | |
| 118. |
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 | |
| 119. |
Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of |
| A. | CO₂ |
| B. | SO₂ |
| C. | Hydrocarbons |
| D. | CFC (chloro fluoro carbon) |
| Answer» E. | |
| 120. |
Inorganic impurities causing water pollution is |
| A. | Fats |
| B. | Carbohydrates |
| C. | Salts of metals |
| D. | Protein |
| Answer» D. Protein | |
| 121. |
Tolerable limit of nitrogen oxides in air is __________ ppm. |
| A. | 0.1 |
| B. | 1 |
| C. | 5 |
| D. | 25 |
| Answer» D. 25 | |
| 122. |
Inhalation of silica dust by human being causes |
| A. | Asphyxiation |
| B. | Shortness of breath |
| C. | Tuberculosis |
| D. | Both B & C |
| Answer» E. | |
| 123. |
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm. |
| A. | 20 |
| B. | 100 |
| C. | 400 |
| D. | 200 |
| Answer» D. 200 | |
| 124. |
Green house effect is accentuated by |
| A. | Deforestation |
| B. | Rapid industrialisation |
| C. | Increased transportation activity |
| D. | All of the above |
| Answer» E. | |
| 125. |
Which of the following is the most severe air pollutant? |
| A. | Hydrocarbons |
| B. | NOx |
| C. | SO₂ |
| D. | CO |
| Answer» C. SO₂ | |
| 126. |
Which of the following industries discharge mercury as a pollutant? |
| A. | Chloro-alkali industry |
| B. | Tanneries |
| C. | Beverage plant |
| D. | Phosphoric acid plant |
| Answer» B. Tanneries | |
| 127. |
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes |
| A. | Paralysis of muscles & loss of appetite |
| B. | Nervous depression |
| C. | Gastritis & diarrhea |
| D. | All of the above |
| Answer» E. | |
| 128. |
Global warming may result in |
| A. | Flood |
| B. | Cyclone |
| C. | Decrease in food productivity |
| D. | All of the above |
| Answer» E. | |
| 129. |
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km. |
| A. | 0.05 |
| B. | 1 |
| C. | 6.5 |
| D. | 15 |
| Answer» D. 15 | |
| 130. |
The main type of sludge gas evolved during sewage treatment in Imhoff tank is |
| A. | CO₂ |
| B. | CH₄ |
| C. | CO |
| D. | H₂ |
| Answer» C. CO | |
| 131. |
Exposure to SO₂ containing chimney gases results in the |
| A. | Reduction in strength of leather & cloth |
| B. | Acceleration of corrosion rates of metals |
| C. | Increased drying & hardening time of paints |
| D. | All of the above |
| Answer» E. | |
| 132. |
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 of the above |
| Answer» E. | |
| 133. |
Threshold limit value (TLV) of CO in air is __________ ppm. |
| A. | 5 |
| B. | 50 |
| C. | 2000 |
| D. | 5000 |
| Answer» C. 2000 | |
| 134. |
Fresh sewage is __________ in nature. |
| A. | Acidic |
| B. | Neutral |
| C. | Alkaline |
| D. | Highly acidic |
| Answer» D. Highly acidic | |
| 135. |
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by |
| A. | Biological oxygen pond |
| B. | Aerated lagoons |
| C. | Trickling filters |
| D. | Gravity separator having oil skimming devices |
| Answer» E. | |
| 136. |
Beyond what concentration of H₂S in air, acute danger to human life exists? |
| A. | 50 ppm |
| B. | 100 ppm |
| C. | 300 ppm |
| D. | 700 ppm |
| Answer» E. | |
| 137. |
High noise levels produced during operation of fans and compressors can be reduced by using |
| A. | Mufflers (silencers) |
| B. | Accoustical absorbent |
| C. | Lagging of noisy duct |
| D. | None of these |
| Answer» B. Accoustical absorbent | |
| 138. |
Biological oxidation ponds remove organic matters present in the polluted water by |
| A. | Using the activities of bacteria and other micro organisms |
| B. | Aerobic oxidation |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 139. |
Main pollutant present in automobile exhaust is |
| A. | CO |
| B. | CO₂ |
| C. | NO |
| D. | Hydrocarbons |
| Answer» B. CO₂ | |
| 140. |
World environment day is observed every year on the 5th of |
| A. | June |
| B. | December |
| C. | July |
| D. | September |
| Answer» B. December | |
| 141. |
The upper layer of atmosphere is called the |
| A. | Stratosphere |
| B. | Troposphere |
| C. | Ionosphere |
| D. | None of these |
| Answer» B. Troposphere | |
| 142. |
Higher concentration of CO₂ in atmosphere |
| A. | Allows visible solar radiation (ultraviolet) of short wave-length to pass through |
| B. | Reflects and absorbs the longer wavelength (infra-red) radiations |
| C. | Prevents solar heat being radiated out completely, resulting in |
| D. | All of the above |
| Answer» E. | |
| 143. |
In large thermal power stations very fine particulates present in flue gas are removed by |
| A. | Wet scrubber |
| B. | Bag filter |
| C. | Electrostatic precipitators |
| D. | Dust catcher |
| Answer» D. Dust catcher | |
| 144. |
In water treatment plant, zeolite process is used to remove the __________ of water. |
| A. | Acidity |
| B. | Alkalinity |
| C. | Hardness |
| D. | Iron & zinc |
| Answer» D. Iron & zinc | |
| 145. |
The maximum CO₂ is emitted into the atmosphere by |
| A. | Combustion |
| B. | Urea |
| C. | Biomass burning |
| D. | Trees |
| Answer» B. Urea | |
| 146. |
Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas. |
| A. | Moderately |
| B. | Highly |
| C. | Extremely |
| D. | Very extremely |
| Answer» E. | |
| 147. |
Which of the following is a green house gas other than CO₂ ? |
| A. | Methane |
| B. | Nitrous oxide |
| C. | Chlorofluro carbons (CFC) |
| D. | All of the above |
| Answer» E. | |
| 148. |
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 | |
| 149. |
Which of the following pollutants is not emitted during volcanic eruptions? |
| A. | SO₂ |
| B. | H₂S |
| C. | CO |
| D. | Hydrocarbons |
| Answer» E. | |
| 150. |
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. | |