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.
| 151. |
Infective bacteria in water is killed by the _____________ process? |
| A. | Sterilisation |
| B. | Aeration |
| C. | Disinfection |
| D. | None of these |
| Answer» B. Aeration | |
| 152. |
Industrial workers working in leather tanning & manufacturing units are prone to suffer from ___________________? |
| A. | Respiratory ailments (e.g. bronchitis) |
| B. | Skin diseases (e.g. dermatitis) |
| C. | Silicosis |
| D. | Blurred vision |
| Answer» C. Silicosis | |
| 153. |
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 | |
| 154. |
In water treatment, alum [Al2(SO4)3] is used for the process of __________________? |
| A. | Filtration |
| B. | Coagulation |
| C. | Sedimentation |
| D. | Disinfection |
| Answer» C. Sedimentation | |
| 155. |
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 | |
| 156. |
In the context of the chemical process industries, the term BOD is normally associated with the_____________________? |
| A. | Characterisation of solid wastes |
| B. | Organic concentration in gaseous effluents |
| C. | Characterisation of liquid effluents |
| D. | Characterisation of boiler feed water |
| Answer» D. Characterisation of boiler feed water | |
| 157. |
In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks? |
| A. | 1 to 2 |
| B. | 4 to 5 |
| C. | 9 to 10 |
| D. | 15 to 20 |
| Answer» C. 9 to 10 | |
| 158. |
In sewage treatment, its sedimentation is speeded up by commonly adding__________________? |
| A. | Hydrochloric acid |
| B. | Lime |
| C. | Copper sulphate |
| D. | Sodium sulphate |
| Answer» C. Copper sulphate | |
| 159. |
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 | |
| 160. |
In a sedimentation tank, the detention period for water ranges from _____________ hours? |
| A. | 2 to 4 |
| B. | 8 to 12 |
| C. | 16 to 20 |
| D. | 24 to 32 |
| Answer» B. 8 to 12 | |
| 161. |
Hydrogen ion concentration in distilled water is___________________? |
| A. | 10-7 |
| B. | 7 × 10-7 |
| C. | 107 |
| D. | 7 × 107 |
| Answer» B. 7 × 10-7 | |
| 162. |
Higher concentration of nitrogen dioxide in atmospheric air causes___________________? |
| A. | Cancer |
| B. | Bronchitis |
| C. | Asphyxiation |
| D. | Corrosion |
| Answer» C. Asphyxiation | |
| 163. |
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 ‘heat trap’ i.e., global warming |
| D. | All A., B. and C. |
| Answer» E. | |
| 164. |
High noise levels produced during operation of fans and compressors can be reduced by using__________________? |
| A. | Mufflers (silencers) |
| B. | Acoustic absorbent |
| C. | Lagging of noisy duct |
| D. | None of these |
| Answer» B. Acoustic absorbent | |
| 165. |
High noise level in a chemical plant can be controlled by the_________________? |
| A. | Suppression of noise at the source itself |
| B. | Path control of noise |
| C. | Protection of operating personnel |
| D. | All A., B. & C. |
| Answer» E. | |
| 166. |
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes____________________? |
| A. | Cancer |
| B. | Silicosis |
| C. | Respiratory disease (e.g., asthma) |
| D. | Reduced crop yield |
| Answer» B. Silicosis | |
| 167. |
Hazardous/polluting chemical industries should have an ‘exclusion zone’ with a green belt and general public access prohibited around it, covering a radius of _____________ metres? |
| A. | 100 |
| B. | 1000 |
| C. | 400 |
| D. | 4000 |
| Answer» C. 400 | |
| 168. |
H2S present in gaseous stream can be removed by adsorption on _____________________? |
| A. | Silica gel |
| B. | Active carbon |
| C. | Bog iron |
| D. | Limestone powder |
| Answer» D. Limestone powder | |
| 169. |
Growth of ______________ is promoted by the presence of manganese in water? |
| A. | Files |
| B. | Algae |
| C. | Micro-organisms |
| D. | Mosquitoes |
| Answer» D. Mosquitoes | |
| 170. |
Green house gases blanket/block the infrared radiation from earth’s surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ? |
| A. | CO2 |
| B. | H2 |
| C. | SO3 |
| D. | N2 |
| Answer» D. N2 | |
| 171. |
Green house effect is accentuated by________________? |
| A. | Deforestation |
| B. | Rapid industrialisation |
| C. | Increased transportation activity |
| D. | All A., B. and C. |
| Answer» E. | |
| 172. |
Global warming may result in __________________? |
| A. | Flood |
| B. | Cyclone |
| C. | Decrease in food productivity |
| D. | All A., B. and C. |
| Answer» E. | |
| 173. |
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm? |
| A. | 5 |
| B. | 50 |
| C. | 500 |
| D. | 5000 |
| Answer» B. 50 | |
| 174. |
Fresh sewage is ______________ in nature? |
| A. | Acidic |
| B. | Neutral |
| C. | Alkaline |
| D. | Highly acidic |
| Answer» D. Highly acidic | |
| 175. |
Fresh domestic sewage is _______________ in color? |
| A. | Grey |
| B. | Dark brown |
| C. | Red |
| D. | Black |
| Answer» B. Dark brown | |
| 176. |
Foul odour and bad taste of water is removed by treating with__________________? |
| A. | Alum |
| B. | Bleaching powder |
| C. | Activated carbon |
| D. | Copper sulphate |
| Answer» D. Copper sulphate | |
| 177. |
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm? |
| A. | 10000 |
| B. | 5 |
| C. | 500 |
| D. | 1000 |
| Answer» C. 500 | |
| 178. |
Foaming and priming in boiler operation can be reduced by reduction in ______________ in feed water? |
| A. | Turbidity |
| B. | Color (Hazen) |
| C. | Total solids |
| D. | All A., B. & C. |
| Answer» E. | |
| 179. |
Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water? |
| A. | Mercury |
| B. | Lead |
| C. | Fluoride |
| D. | Arsenic |
| Answer» D. Arsenic | |
| 180. |
Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air? |
| A. | Hydrocarbons |
| B. | Hydrogen fluoride |
| C. | Hydrogen sulphides |
| D. | Nitrogen dioxide |
| Answer» C. Hydrogen sulphides | |
| 181. |
Fine grit present in sewage is removed in the _____________ during sewage treatment? |
| A. | Grit chamber |
| B. | Detritus tank |
| C. | Trickling filter |
| D. | Skimming tank |
| Answer» C. Trickling filter | |
| 182. |
Exposure to small amount of ______________ results in high blood pressure & heart disease in human beings? |
| A. | Hydrogen sulphide |
| B. | Mercury |
| C. | Cadmium |
| D. | Asbestos |
| Answer» D. Asbestos | |
| 183. |
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 A., B. and C. |
| Answer» E. | |
| 184. |
Exposure to chemicals having carcinogenic properties cause___________________? |
| A. | Dermatitis (skin disorder) |
| B. | Cancer |
| C. | Asphyxiation |
| D. | Asthma |
| Answer» C. Asphyxiation | |
| 185. |
Exposure to chemicals having carcinogenic properties cause ____________________? |
| A. | Dermatitis (skin disorder) |
| B. | Cancer |
| C. | Asphyxiation (suffocation) |
| D. | Asthma |
| Answer» C. Asphyxiation (suffocation) | |
| 186. |
Ethanolamine is an absorbent used for the removal of _____________ from air/gas? |
| A. | HF |
| B. | SO2 |
| C. | H2S |
| D. | Both B. & C. |
| Answer» E. | |
| 187. |
Dust collection efficiency of a cyclone separator depends upon its______________? |
| A. | Diameter |
| B. | Inlet gas velocity |
| C. | Overall height |
| D. | All A., B. & C. |
| Answer» E. | |
| 188. |
During sewage treatment, the sewage is subjected to ______________ treatment in Imhoff tank? |
| A. | Filtration |
| B. | Digestion |
| C. | Sedimentation |
| D. | Both B. and C. |
| Answer» E. | |
| 189. |
Dissolved oxygen content in river water is around _____________ ppm? |
| A. | 5 |
| B. | 100 |
| C. | 250 |
| D. | 500 |
| Answer» B. 100 | |
| 190. |
Disinfection of water is done to remove ______________________? |
| A. | Color |
| B. | Bad taste |
| C. | Foul odour |
| D. | Bacteria |
| Answer» E. | |
| 191. |
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________? |
| A. | Ozone and iodine |
| B. | Chlorine or its compounds |
| C. | Ultraviolet light for irradiation of water |
| D. | All A., B. & C. |
| Answer» E. | |
| 192. |
Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as________________? |
| A. | Photochemical smog |
| B. | Peroxyacetyl nitrate (PAN) or methyl nitrite |
| C. | Benzopyrene |
| D. | Polyacrylonitrile |
| Answer» C. Benzopyrene | |
| 193. |
Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm? |
| A. | 20 |
| B. | 100 |
| C. | 400 |
| D. | 200 |
| Answer» D. 200 | |
| 194. |
Deaeration of high pressure boiler feed water is done to reduce ___________________? |
| A. | Foaming from boilers |
| B. | Its dissolved oxygen content |
| C. | Its silica content |
| D. | Caustic embrittlement |
| Answer» C. Its silica content | |
| 195. |
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 A., B. and C. |
| Answer» E. | |
| 196. |
______________ content of the phosphate rock is the pollutant of primary interest in a phosphatic fertiliser plant ? |
| A. | Calcium |
| B. | Fluorine |
| C. | Phosphorous |
| D. | Sulphur |
| Answer» C. Phosphorous | |
| 197. |
Color test of water is done with an instrument called__________________? |
| A. | Tintometer |
| B. | Colorimeter |
| C. | Electro-chemical cell |
| D. | Turbidimeter |
| Answer» B. Colorimeter | |
| 198. |
COD of raw municipal sewage may be in the range of about _____________ mg/litre? |
| A. | 1-2 |
| B. | 5-10 |
| C. | 90-120 |
| D. | 1500-2500 |
| Answer» D. 1500-2500 | |
| 199. |
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ? |
| A. | By chemical coagulation |
| B. | In sedimentation tanks equipped with mechanical scrapper |
| C. | In vacuum filter |
| D. | In clarifiers |
| Answer» C. In vacuum filter | |
| 200. |
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing ________________ molecules of ozone? |
| A. | 102 |
| B. | 105 |
| C. | 109 |
| D. | 1015 |
| Answer» C. 109 | |