MCQOPTIONS
Saved Bookmarks
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.
| 151. |
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. | |
| 152. |
Most of the atmospheric air pollutants are present in large quantity in |
| A. | Stratosphere |
| B. | Thermosphere |
| C. | Trophosphere |
| D. | Mesosphere |
| Answer» D. Mesosphere | |
| 153. |
Iron & manganese present in the polluted water is removed by |
| A. | Simple filtration |
| B. | Oxidation followed by settling & filtration |
| C. | Chemical coagulation |
| D. | Chlorination only |
| Answer» C. Chemical coagulation | |
| 154. |
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes |
| A. | Skin disorder |
| B. | Bronchitis |
| C. | Bone disease |
| D. | Cancer |
| Answer» C. Bone disease | |
| 155. |
Which is the most practical and economical method for removal of suspended solid matter from polluted water? |
| A. | Sedimentation |
| B. | Skimming off |
| C. | Chlorination |
| D. | Biological oxidation |
| Answer» B. Skimming off | |
| 156. |
Main pollutants released from petroleum refineries is |
| A. | CO, SO₂ & H₂S |
| B. | CO₂, NO & SO₃ |
| C. | CO₂, H₂S & NO₂ |
| D. | SO₃, NO₂ & CO₂ |
| Answer» B. CO₂, NO & SO₃ | |
| 157. |
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in |
| A. | Food industry |
| B. | Municipal sewage treatment |
| C. | Petroleum refinery |
| D. | Iron & steel plant |
| Answer» B. Municipal sewage treatment | |
| 158. |
Solid content in most of the domestic sewage is about __________ percent. |
| A. | 0.001 |
| B. | 0.1 |
| C. | 5 |
| D. | 10 |
| Answer» C. 5 | |
| 159. |
Carbon monoxide is a pollutant, which causes |
| A. | Respiratory disease (e.g. asthma) |
| B. | Asphyxiation (suffocation) leading to death |
| C. | Retardation in crop growth |
| D. | Damage to building materials like marble |
| Answer» C. Retardation in crop growth | |
| 160. |
Which of the following is not a source of ozone emission in the atmosphere? |
| A. | Refrigerators |
| B. | Xerox machines |
| C. | Dermatological photo-therapy equipments |
| D. | High voltage electrical equipments |
| Answer» B. Xerox machines | |
| 161. |
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes |
| A. | Asphyxiation (suffocation) |
| B. | Shortness of breath |
| C. | Tuberculosis |
| D. | All of the above |
| Answer» E. | |
| 162. |
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in |
| A. | Arizona (U.S.A.) |
| B. | Chernobyl (undivided U.S.S.R.) |
| C. | Pensylvania (U.S.A.) |
| D. | Moscow (U.S.S.R.) |
| Answer» C. Pensylvania (U.S.A.) | |
| 163. |
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called |
| A. | Grit |
| B. | Dust |
| C. | Powder |
| D. | Smoke |
| Answer» B. Dust | |
| 164. |
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm. |
| A. | 0.1 |
| B. | 25 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 25 | |
| 165. |
Carcinogenic air pollutants cause |
| A. | Bone decay |
| B. | Cancer |
| C. | Asphyxiation (suffocation) |
| D. | Anemia |
| Answer» C. Asphyxiation (suffocation) | |
| 166. |
Noise pollution level in a chemical plant is expressed in |
| A. | Roentgen |
| B. | Decibel |
| C. | Hertz |
| D. | None of these |
| Answer» C. Hertz | |
| 167. |
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm. |
| A. | 1 |
| B. | 5 |
| C. | 50 |
| D. | 500 |
| Answer» C. 50 | |
| 168. |
A shallow pond in which the sewage is retained and biologically treated is called |
| A. | Oxidation |
| B. | Imhoff tank |
| C. | Lagoon |
| D. | Skimming tank |
| Answer» B. Imhoff tank | |
| 169. |
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is |
| A. | Neutralised by alkali treatment |
| B. | Left as such without any treatment |
| C. | Diluted with fresh water to reduce its acidity |
| D. | None of these |
| Answer» B. Left as such without any treatment | |
| 170. |
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it. |
| A. | Hydrogen |
| B. | Carbon dioxide |
| C. | Ozone |
| D. | None of these |
| Answer» D. None of these | |
| 171. |
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl 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. | Inhances the green house effect |
| Answer» C. Causes increase in sea level | |
| 172. |
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 | |
| 173. |
Reingleman chart is used for the evaluation of __________ pollution. |
| A. | Air |
| B. | Water |
| C. | Noise |
| D. | Radioactive |
| Answer» B. Water | |
| 174. |
The permissible color for domestic water supply is __________ ppm. |
| A. | 1 |
| B. | 20 |
| C. | 100 |
| D. | 1000 |
| Answer» C. 100 | |
| 175. |
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 of the above |
| Answer» E. | |
| 176. |
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm. |
| A. | 5 |
| B. | 100 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 100 | |
| 177. |
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 | |
| 178. |
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 | |
| 179. |
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 | |
| 180. |
Ethanolamine is an absorbant used for the removal of __________ from air/gas. |
| A. | HF |
| B. | SO₂ |
| C. | H₂S |
| D. | Both B & C |
| Answer» E. | |
| 181. |
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur? |
| A. | Thermosphere |
| B. | Troposphere |
| C. | Stratosphere |
| D. | None of these |
| Answer» C. Stratosphere | |
| 182. |
White smoke coming out of the chimney of a furnace indicates the use of |
| A. | Low excess air |
| B. | Very high excess air |
| C. | Gaseous fuel in the furnace |
| D. | Liquid fuel in the furnace |
| Answer» C. Gaseous fuel in the furnace | |
| 183. |
Inhalation of silica dust causes a disease called |
| A. | Bronchitis |
| B. | Silicosis |
| C. | Pneumoconiosis |
| D. | None of these |
| Answer» C. Pneumoconiosis | |
| 184. |
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 | |
| 185. |
5-200 μm size particles are called |
| A. | Colloids or aerosols |
| B. | Powder |
| C. | Dust |
| D. | Smoke |
| Answer» B. Powder | |
| 186. |
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c. |
| A. | 1 |
| B. | 7 |
| C. | 19 |
| D. | 82 |
| Answer» C. 19 | |
| 187. |
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m³.(μg-microgram) |
| A. | 10 |
| B. | 90 |
| C. | 800 |
| D. | 750 |
| Answer» C. 800 | |
| 188. |
Reingleman chart No. 2 corresponds to __________ percent black smoke. |
| A. | 10 |
| B. | 20 |
| C. | 40 |
| D. | 80 |
| Answer» D. 80 | |
| 189. |
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume). |
| A. | 1 |
| B. | 3 |
| C. | 7 |
| D. | 20 |
| Answer» E. | |
| 190. |
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre. |
| A. | 2 |
| B. | 42 |
| C. | 332 |
| D. | 1050 |
| Answer» C. 332 | |
| 191. |
Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million). |
| A. | 50 |
| B. | 1000 |
| C. | 2000 |
| D. | 5000 |
| Answer» E. | |
| 192. |
Average human body contains about __________ percent water by weight. |
| A. | 20 |
| B. | 40 |
| C. | 70 |
| D. | 85 |
| Answer» D. 85 | |
| 193. |
Septic tanks are used for the __________ of the deposited solids. |
| A. | Separation |
| B. | Anaerobic decomposition |
| C. | Aerobic decomposition |
| D. | None of these |
| Answer» C. Aerobic decomposition | |
| 194. |
Out of the following, TLV of __________ is maximum (about 500 ppm). |
| A. | Carbon dioxide |
| B. | Toluene |
| C. | Carbon disulphide |
| D. | Acetaldehyde |
| Answer» B. Toluene | |
| 195. |
In water treatment, alum[Al2(SO₄)3] is used for the process of |
| A. | Filtration |
| B. | Coagulation |
| C. | Sedimentation |
| D. | Disinfection |
| Answer» C. Sedimentation | |
| 196. |
Peroxyacyl 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 | |
| 197. |
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels. |
| A. | 105 |
| B. | 135 |
| C. | 160 |
| D. | 185 |
| Answer» C. 160 | |
| 198. |
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels. |
| A. | 90 |
| B. | 120 |
| C. | 150 |
| D. | 180 |
| Answer» C. 150 | |
| 199. |
Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases. |
| A. | Reduce SO₂ content in |
| B. | Catalytically convert SO₂ to SO₃ in |
| C. | Increase the dew point of |
| D. | None of these |
| Answer» B. Catalytically convert SO₂ to SO₃ in | |
| 200. |
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called |
| A. | Thermosphere |
| B. | Stratosphere |
| C. | Troposphere |
| D. | Mesosphere |
| Answer» C. Troposphere | |