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.
| 251. |
*/*_Global warming may result in? |
| A. | Flood |
| B. | Cyclone |
| C. | Decrease in food productivity |
| D. | All of the above |
| Answer» E. | |
| 252. |
*/*_Inhalation of silica dust by human being causes? |
| A. | Asphyxiation |
| B. | Shortness of breath |
| C. | Tuberculosis |
| D. | Both B & C |
| Answer» E. | |
| 253. |
*/*_Which of the following is the most severe air pollutant?? |
| A. | Hydrocarbons |
| B. | NOx |
| C. | SO‚ÇÇ |
| D. | CO |
| Answer» C. SO‚Äö√á√á | |
| 254. |
*/*_Solid content in most of the domestic sewage is about __________ percent.? |
| A. | 0.001 |
| B. | 0.1 |
| C. | 5 |
| D. | 10 |
| Answer» C. 5 | |
| 255. |
*/*_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 | |
| 256. |
*/*_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. | |
| 257. |
*/*_Noise pollution level in a chemical plant is expressed in? |
| A. | Roentgen |
| B. | Decibel |
| C. | Hertz |
| D. | None of these |
| Answer» C. Hertz | |
| 258. |
*/*_Reingleman chart is used for the evaluation of __________ pollution.? |
| A. | Air |
| B. | Water |
| C. | Noise |
| D. | Radioactive |
| Answer» B. Water | |
| 259. |
*/*_Ethanolamine is an absorbant used for the removal of __________ from air/gas.? |
| A. | HF |
| B. | SO‚ÇÇ |
| C. | H‚ÇÇS |
| D. | Both B & C |
| Answer» E. | |
| 260. |
*/*_TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.? |
| A. | 5 |
| B. | 100 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 100 | |
| 261. |
*/*_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 | |
| 262. |
*/*_Most of the atmospheric air pollutants are present in large quantity in? |
| A. | Stratosphere |
| B. | Thermosphere |
| C. | Trophosphere |
| D. | Mesosphere |
| Answer» D. Mesosphere | |
| 263. |
*/*_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 | |
| 264. |
*/*_World environment day is observed every year on the 5th of? |
| A. | June |
| B. | December |
| C. | July |
| D. | September |
| Answer» B. December | |
| 265. |
*/*_Which of the following pollutants is not emitted during volcanic eruptions?? |
| A. | SO‚ÇÇ |
| B. | H‚ÇÇS |
| C. | CO |
| D. | Hydrocarbons |
| Answer» E. | |
| 266. |
*/*_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. | |
| 267. |
*/*_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 | |
| 268. |
*/*_Which of the following is an adsorbant used for the removal of SO‚ÇÇ from gas/air?? |
| A. | Bog iron |
| B. | Limestone powder or alkalised alumina |
| C. | Silica gel |
| D. | Active carbon |
| Answer» C. Silica gel | |
| 269. |
*/*_Maximum allowable concentration of CO‚ÇÇ in air for safe working is __________ ppm (parts per million).? |
| A. | 50 |
| B. | 1000 |
| C. | 2000 |
| D. | 5000 |
| Answer» E. | |
| 270. |
*/*_Out of the following, TLV of __________ is maximum (about 500 ppm).? |
| A. | Carbon dioxide |
| B. | Toluene |
| C. | Carbon disulphide |
| D. | Acetaldehyde |
| Answer» B. Toluene | |
| 271. |
*/*_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 | |
| 272. |
*/*_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. | CO‚ÇÇ |
| B. | H‚ÇÇ |
| C. | SO‚ÇÉ |
| D. | N‚ÇÇ |
| Answer» D. N‚Äö√á√á | |
| 273. |
*/*_Workers working in __________ industry are most prone to white lung cancer.? |
| A. | Coal mining |
| B. | Limestone mining |
| C. | Textile |
| D. | Asbestos |
| Answer» D. Asbestos | |
| 274. |
*/*_Aerosols present in atmospheric air may be? |
| A. | Positively charged |
| B. | Negatively charged |
| C. | Neutral |
| D. | Combination of all A, B & C |
| Answer» E. | |
| 275. |
*/*_Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.? |
| A. | Coal ash |
| B. | Potassium cyanide |
| C. | Ortho-xylene |
| D. | None of these |
| Answer» C. Ortho-xylene | |
| 276. |
*/*_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. | Remains constant |
| D. | May increase or decrease ; depends on the chemical characteristics of polluted water |
| Answer» B. Increases | |
| 277. |
*/*_BOD of raw municipal sewage may be in the range of about __________ mg/litre.? |
| A. | 1-2 |
| B. | 5-10 |
| C. | 150-300 |
| D. | 2000-3000 |
| Answer» D. 2000-3000 | |
| 278. |
*/*_Which of the following is the most lethal water pollutant?? |
| A. | Phenol and cynide |
| B. | Chlorine |
| C. | Alkalis |
| D. | Suspended solids |
| Answer» B. Chlorine | |
| 279. |
*/*_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 | |
| 280. |
*/*_Noise level in a quiet private business office is about __________ decibels.? |
| A. | 25 |
| B. | 50 |
| C. | 70 |
| D. | 85 |
| Answer» C. 70 | |
| 281. |
*/*_Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.? |
| A. | 120 |
| B. | 140 |
| C. | 170 |
| D. | 200 |
| Answer» D. 200 | |
| 282. |
*/*_Insufficient washing of sand grains in a rapid sand filter causes? |
| A. | Air binding |
| B. | Shrinkage of filtering media |
| C. | Mud balls |
| D. | Expansion of filtering media |
| Answer» D. Expansion of filtering media | |
| 283. |
*/*_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. | |
| 284. |
%_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 | |
| 285. |
%_Acute danger to human life (i.e. death) exists, if the concentration of CO‚ÇÇ in atmospheric air exceeds __________ percent (by volume)._% |
| A. | 1 |
| B. | 3 |
| C. | 7 |
| D. | 20 |
| Answer» E. | |
| 286. |
%_Hydrogen ion concentration in distilled water is_% |
| A. | 10⁻⁷ |
| B. | 7 x 10⁻⁷ |
| C. | 10‚Äö√Ö‚àë |
| D. | 7 x 10‚Äö√Ö‚àë |
| Answer» B. 7 x 10‚Äö√Ö¬™‚Äö√Ö‚àë | |
| 287. |
_ Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?$? |
| A. | Benzopyrene |
| B. | Peroxyacyl nitrate |
| C. | Carbon monoxide |
| D. | Sulphur dioxide |
| Answer» D. Sulphur dioxide | |
| 288. |
_ Presence of bacteria in potable (drinking) water causes$? |
| A. | Turbidity |
| B. | Disease |
| C. | Bad odour |
| D. | Bad taste & colour |
| Answer» C. Bad odour | |
| 289. |
_ The main industrial source of emission of hydrogen sulphide air pollutant is$? |
| A. | Petroleum refineries |
| B. | Coal based thermal power plants |
| C. | Pulp and paper plant |
| D. | Metallurgical roasting & smelting plant |
| Answer» C. Pulp and paper plant | |
| 290. |
_ Which of the following processes is involved in the biochemical treatment of sewage effluents?$? |
| A. | Oxidation |
| B. | Reduction |
| C. | Dehydration |
| D. | Fermentation |
| Answer» B. Reduction | |
| 291. |
_ When the concentration of SO‚ÇÇ in air is greater than __________ ppm, it gives a pungent smell.$? |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 4 |
| Answer» E. | |
| 292. |
_ Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for$? |
| A. | Conversion of CO into CO‚ÇÇ in the second compartment |
| B. | Conversion of NOx into N‚ÇÇ and NH‚ÇÉ in the first compartment |
| C. | Oxidation of unburnt hydrocarbon fuel in the second compartment |
| D. | All of the above |
| Answer» E. | |
| 293. |
_ Brown spots in fabrics will be caused by washing with water containing large amount of .$? |
| A. | Iron |
| B. | Zinc |
| C. | Iodine |
| D. | Bromine |
| Answer» B. Zinc | |
| 294. |
_ Dose of chlorine for disinfection of water is about __________ mg/litre of water.$? |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.3 |
| D. | 1 |
| Answer» E. | |
| 295. |
_ The common pollutant generated in chlor-alkali industry and battery manufacture is$? |
| A. | Mercury |
| B. | Brine |
| C. | Phosphate |
| D. | None of these |
| Answer» B. Brine | |
| 296. |
_ Which of the following is not an air pollutant?$? |
| A. | Ozone |
| B. | Carcinogens |
| C. | Pesticides |
| D. | Metallic powders |
| Answer» B. Carcinogens | |
| 297. |
_ Industrial workers working in leather tanning & manufacturing units are prone to suffer from$? |
| A. | Respirtory ailments (e.g. bronchitis) |
| B. | Skin diseases (e.g. dermatities) |
| C. | Silicosis |
| D. | Blurred vision |
| Answer» C. Silicosis | |
| 298. |
_ Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to$? |
| A. | Reynold stresses |
| B. | Shear forces |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 299. |
_ Which of the following is the most widely used disinfectant in water treatment?$? |
| A. | Chlorine |
| B. | Irradiation of water by ultraviolet light |
| C. | Cation exchanger |
| D. | Coagulation |
| Answer» B. Irradiation of water by ultraviolet light | |
| 300. |
_ Scale formation in boiler is controlled by$? |
| 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 H‚ÇÇS in feed water |
| Answer» C. Keeping the pH value of feed water just below 7 | |