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.
| 301. |
_ Which of the following is a secondary air pollutant?$? |
| A. | Photochemical smog |
| B. | Sulphur dioxide |
| C. | Nitrogen dioxide |
| D. | Dust particles |
| Answer» B. Sulphur dioxide | |
| 302. |
_ Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?$? |
| A. | Active carbon |
| B. | Silica gel |
| C. | Bog iron (iron oxide) |
| D. | Pulverised limestone |
| Answer» C. Bog iron (iron oxide) | |
| 303. |
_ 80% less than 200 mesh size particles are called$? |
| A. | Smoke |
| B. | Powder |
| C. | Grit |
| D. | Aggregates |
| Answer» C. Grit | |
| 304. |
_ During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?$? |
| A. | Idle running |
| B. | Acceleration |
| C. | Cruising |
| D. | Deaccelaration |
| Answer» B. Acceleration | |
| 305. |
_ Which of the following sources is responsible for maximum air pollution?$? |
| A. | Industrial chimney exhaust |
| B. | Forest fire |
| C. | Automobiles exhaust |
| D. | Photochemical oxidation of organic matter |
| Answer» D. Photochemical oxidation of organic matter | |
| 306. |
_ The commonest form of iron & manganese found in ground water as pollutant is in the form of their$? |
| A. | Carbonates |
| B. | Bi-carbonates |
| C. | Chlorides |
| D. | Sulphides |
| Answer» C. Chlorides | |
| 307. |
_ Threshold limit value (TLV) of CO in air is __________ ppm.$? |
| A. | 5 |
| B. | 50 |
| C. | 2000 |
| D. | 5000 |
| Answer» C. 2000 | |
| 308. |
_ There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.$? |
| A. | 0.05 |
| B. | 1 |
| C. | 6.5 |
| D. | 15 |
| Answer» D. 15 | |
| 309. |
_ Death may occur, when SO‚ÇÇ concentration in atmospheric air exceeds __________ ppm.$? |
| A. | 20 |
| B. | 100 |
| C. | 400 |
| D. | 200 |
| Answer» D. 200 | |
| 310. |
_ Which of the following industries discharge mercury as a pollutant?$? |
| A. | Chloro-alkali industry |
| B. | Tanneries |
| C. | Beverage plant |
| D. | Phosphoric acid plant |
| Answer» B. Tanneries | |
| 311. |
_ Carbon monoxide is a pollutant, which causes$? |
| A. | Respiratory disease (e.g. asthma) |
| B. | Asphyxiation (suffocation) leading to death |
| C. | Retardation in crop growth |
| D. | Damage to building materials like marble |
| Answer» C. Retardation in crop growth | |
| 312. |
_ Main pollutants released from petroleum refineries is$? |
| A. | CO, SO‚ÇÇ & H‚ÇÇS |
| B. | CO‚ÇÇ, NO & SO‚ÇÉ |
| C. | CO‚ÇÇ, H‚ÇÇS & NO‚ÇÇ |
| D. | SO‚ÇÉ, NO‚ÇÇ & CO‚ÇÇ |
| Answer» B. CO‚Äö√á√á, NO & SO‚Äö√á√â | |
| 313. |
_ World's worst radioactive pollution was caused by nuclear reactor disaster which occured in$? |
| A. | Arizona (U.S.A.) |
| B. | Chernobyl (undivided U.S.S.R.) |
| C. | Pensylvania (U.S.A.) |
| D. | Moscow (U.S.S.R.) |
| Answer» C. Pensylvania (U.S.A.) | |
| 314. |
_ From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.$? |
| A. | 1 |
| B. | 5 |
| C. | 50 |
| D. | 500 |
| Answer» C. 50 | |
| 315. |
_ The permissible color for domestic water supply is __________ ppm.$? |
| A. | 1 |
| B. | 20 |
| C. | 100 |
| D. | 1000 |
| Answer» C. 100 | |
| 316. |
_ Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?$? |
| A. | Thermosphere |
| B. | Troposphere |
| C. | Stratosphere |
| D. | None of these |
| Answer» C. Stratosphere | |
| 317. |
_ High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes$? |
| A. | Cancer |
| B. | Silicosis |
| C. | Respiratory disease (e.g., asthma) |
| D. | Reduced crop yield |
| Answer» B. Silicosis | |
| 318. |
_ 5-200 μm size particles are called$? |
| A. | Colloids or aerosols |
| B. | Powder |
| C. | Dust |
| D. | Smoke |
| Answer» B. Powder | |
| 319. |
_ Iron & manganese present in the polluted water is removed by$? |
| A. | Simple filtration |
| B. | Oxidation followed by settling & filtration |
| C. | Chemical coagulation |
| D. | Chlorination only |
| Answer» C. Chemical coagulation | |
| 320. |
_ In water treatment plant, zeolite process is used to remove the __________ of water.$? |
| A. | Acidity |
| B. | Alkalinity |
| C. | Hardness |
| D. | Iron & zinc |
| Answer» D. Iron & zinc | |
| 321. |
_ 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.$? |
| A. | 100 |
| B. | 1000 |
| C. | 400 |
| D. | 4000 |
| Answer» C. 400 | |
| 322. |
_ Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called$? |
| A. | Fumes |
| B. | Mists |
| C. | Smoke |
| D. | Aerosols |
| Answer» E. | |
| 323. |
_ Which of the following is a green house gas other than CO‚ÇÇ ?$? |
| A. | Methane |
| B. | Nitrous oxide |
| C. | Chlorofluro carbons (CFC) |
| D. | All of the above |
| Answer» E. | |
| 324. |
_ In sewage treatment, its sedimentation is speeded up by commonly adding$? |
| A. | Hydrochloric acid |
| B. | Lime |
| C. | Copper sulphate |
| D. | Sodium sulphate |
| Answer» C. Copper sulphate | |
| 325. |
_ In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.$? |
| A. | 1 to 2 |
| B. | 4 to 5 |
| C. | 9 to 10 |
| D. | 15 to 20 |
| Answer» C. 9 to 10 | |
| 326. |
_ Average human body contains about __________ percent water by weight.$? |
| A. | 20 |
| B. | 40 |
| C. | 70 |
| D. | 85 |
| Answer» D. 85 | |
| 327. |
_ In water treatment, alum[Al2(SO‚ÇÑ)3] is used for the process of$? |
| A. | Filtration |
| B. | Coagulation |
| C. | Sedimentation |
| D. | Disinfection |
| Answer» C. Sedimentation | |
| 328. |
_ Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.$? |
| A. | 90 |
| B. | 120 |
| C. | 150 |
| D. | 180 |
| Answer» C. 150 | |
| 329. |
_ __________ can not control the noise pollution.$? |
| A. | Use of silencers |
| B. | Green house gases |
| C. | Vibration damping |
| D. | Tree plantation |
| Answer» C. Vibration damping | |
| 330. |
_ What are the methods of treatment & disposal of radioactive wastes?$? |
| A. | Evaporation & chemical precipitation |
| B. | Biological methods & adsorption in ion exchange materials |
| C. | Fixing into a solid mass with cement and sinking deep in the sea |
| D. | All of the above |
| Answer» E. | |
| 331. |
_ Carbonaceous particles having size less than 1 μm are called$? |
| A. | Grit |
| B. | Aggregates |
| C. | Aerosols |
| D. | Smoke |
| Answer» E. | |
| 332. |
_ Reinglemann chart is used for the measurement of the$? |
| A. | Combustibles present in automobile exhaust |
| B. | Smoke density from a chimey |
| C. | Exhaust gas density |
| D. | Flue gas temperature |
| Answer» C. Exhaust gas density | |
| 333. |
_ Which of the following is not a weightless pollutant?$? |
| A. | SPM |
| B. | Thermal pollution |
| C. | Radioactive rays |
| D. | Noise pollution |
| Answer» B. Thermal pollution | |
| 334. |
____________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.__ |
| A. | Calcium |
| B. | Fluorine |
| C. | Phosphorous |
| D. | Sulphur |
| Answer» C. Phosphorous | |
| 335. |
__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 | |
| 336. |
__Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.__ |
| A. | Radioactive |
| B. | Organic |
| C. | Inorganic |
| D. | None of these |
| Answer» D. None of these | |
| 337. |
__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 | |
| 338. |
__Noise level inside a jet air liner in normal flight is about __________ decibels.__ |
| A. | 80 |
| B. | 100 |
| C. | 125 |
| D. | 145 |
| Answer» C. 125 | |
| 339. |
__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 CO‚ÇÇ level in atmosphere. where CO‚ÇÇ 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. | |
| 340. |
__Beyond what concentration of H‚ÇÇS in air, acute danger to human life exists?__ |
| A. | 50 ppm |
| B. | 100 ppm |
| C. | 300 ppm |
| D. | 700 ppm |
| Answer» E. | |
| 341. |
_Main pollutant present in automobile exhaust is$? |
| A. | CO |
| B. | CO‚ÇÇ |
| C. | NO |
| D. | Hydrocarbons |
| Answer» B. CO‚Äö√á√á | |
| 342. |
_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 ozones.$? |
| A. | 10² |
| B. | 10⁵ |
| C. | 10‚Åπ |
| D. | 10¹⁵ |
| Answer» C. 10‚Äö√ÖœÄ | |
| 343. |
_Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by$? |
| 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 | |
| 344. |
_In water chemical treatment plant, use of chloramines ensures$? |
| A. | Disinfection |
| B. | Taste & odour control |
| C. | Weed control in reservoirs |
| D. | Removal of permanent hardness |
| Answer» B. Taste & odour control | |
| 345. |
_A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the$? |
| A. | Global warming |
| B. | Green house |
| C. | Atmospheric effect |
| D. | Ionosphere |
| Answer» C. Atmospheric effect | |
| 346. |
_Arsenic pollutant is not generated in____industries.$? |
| A. | Tanneries |
| B. | Glass & ceramic |
| C. | Beverages |
| D. | Any of these |
| Answer» D. Any of these | |
| 347. |
_The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.$? |
| A. | 1 |
| B. | 4 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 348. |
_Thermal pollution due to excessive heat & temperature in the working place causes$? |
| A. | Reduction in working efficiency of manpower |
| B. | Fatigue |
| C. | High breathing rate |
| D. | All of the above |
| Answer» E. | |
| 349. |
_The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is$? |
| A. | Pipe vibrations |
| B. | Cavitation |
| C. | Boundary layer separation |
| D. | Fluctuation in liquid flow |
| Answer» C. Boundary layer separation | |
| 350. |
_Which of the following fine dust removal equipments is the most efficient?$? |
| A. | Bag filter |
| B. | Scrubber |
| C. | Electrostatic precipitator |
| D. | Cyclone separator |
| Answer» D. Cyclone separator | |