MCQOPTIONS
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MCQOPTIONS
This section includes 528 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 351. |
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. | |
| 352. |
Which of the following is not an air pollutant ? |
| A. | Ozone |
| B. | Carcinogens |
| C. | Pesticides |
| D. | Metallic powders |
| Answer» B. Carcinogens | |
| 353. |
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. | |
| 354. |
The progressive warming up of the earth's surface is mainly due to the |
| A. | automobile exhaust. |
| B. | blanketing effect of CO2 in the atmosphere. |
| C. | de-forestation. |
| D. | thickening of ozone layer. |
| Answer» C. de-forestation. | |
| 355. |
Sulphur dioxide present in the industrial chimney exhaust gases causes |
| A. | respiratory & lung disease. |
| B. | reduction in plant's productivity owing to acid rain. |
| C. | corrosion of building materials. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 356. |
Which of the following pollutants, if present in atmosphere is detectable by its odour ? |
| A. | CO |
| B. | SO2 |
| C. | NO2 |
| D. | CO2 |
| Answer» C. NO2 | |
| 357. |
__________ substances present in sewage are removed in grit chamber during sewage treatment. |
| A. | Organic |
| B. | Fatty |
| C. | Inorganic |
| D. | Dissolved |
| Answer» D. Dissolved | |
| 358. |
Which of the following acts as a natural source of air pollution ? |
| A. | Forest fire |
| B. | Deforestation |
| C. | Volcanic eruption |
| D. | None of these |
| Answer» D. None of these | |
| 359. |
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels. |
| A. | 25 |
| B. | 50 |
| C. | 80 |
| D. | 120 |
| Answer» D. 120 | |
| 360. |
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the |
| A. | forestation |
| B. | rain |
| C. | green house effect |
| D. | vegetation |
| Answer» D. vegetation | |
| 361. |
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 (a), (b) and (c). |
| Answer» E. | |
| 362. |
Algae growth in water is controlled by |
| A. | deoxidation |
| B. | chlorination |
| C. | bleaching |
| D. | aeration |
| Answer» C. bleaching | |
| 363. |
Ethanolamine is an absorbant used for the removal of __________ from air/gas. |
| A. | HF |
| B. | SO2 |
| C. | H2S |
| D. | both (b) & (c) |
| Answer» E. | |
| 364. |
Soluble silica present in boiler feed water can be removed by |
| A. | coagulation |
| B. | filtration |
| C. | anion exchanger |
| D. | preheating it |
| Answer» D. preheating it | |
| 365. |
Removal of __________ is accomplished by aeration of water. |
| A. | dissolved gases |
| B. | suspended solids |
| C. | dissolved solids |
| D. | none of these |
| Answer» B. suspended solids | |
| 366. |
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. | |
| 367. |
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by |
| A. | chemical coagulation |
| B. | floatation & skimming |
| C. | centrifugation |
| D. | ultrafiltration |
| Answer» B. floatation & skimming | |
| 368. |
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called |
| A. | cesspool |
| B. | lagoon |
| C. | skimming mill |
| D. | septic tank |
| Answer» E. | |
| 369. |
Inhalation of silica dust by human being causes |
| A. | asphyxiation |
| B. | shortness of breath |
| C. | tuberculosis |
| D. | both(b) & (c) |
| Answer» E. | |
| 370. |
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm. |
| A. | 1000 to 2000 |
| B. | 3000 to 6000 |
| C. | 6000 to 9000 |
| D. | 10000 to 100000 |
| Answer» E. | |
| 371. |
Ozone level is generally found to be depleted in India in the month of |
| A. | February |
| B. | July |
| C. | April |
| D. | December |
| Answer» E. | |
| 372. |
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called$ |
| A. | grit |
| B. | dust |
| C. | powder |
| D. | smoke |
| Answer» B. dust | |
| 373. |
Polyvinyl chloride containers are not suitable for storing |
| A. | foodstuffs |
| B. | woolen clothes |
| C. | metallic powder |
| D. | none of these |
| Answer» B. woolen clothes | |
| 374. |
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes |
| A. | fading of dyes on textiles. |
| B. | corrosion, tarnishing & soiling of metals. |
| C. | reduced strength of textiles. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 375. |
TLV of aldrin in public water supply system is about __________ μg/litre.$ |
| A. | 0.5 |
| B. | 17 |
| C. | 357 |
| D. | 1097 |
| Answer» C. 357 | |
| 376. |
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 | |
| 377. |
Ozone is |
| A. | a primary pollutant. |
| B. | a secondary pollutant. |
| C. | impervious to ultra-violet rays. |
| D. | both (b) and (c) |
| Answer» E. | |
| 378. |
The lowest layer of atmosphere is known as the |
| A. | stratosphere |
| B. | troposphere |
| C. | ionosphere |
| D. | none of these |
| Answer» C. ionosphere | |
| 379. |
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. | |
| 380. |
Which of the following is a green house gas other than CO2 ? |
| A. | Methane |
| B. | Nitrous oxide |
| C. | Chlorofluro carbons (CFC) |
| D. | All (a), (b) and (c) |
| Answer» E. | |
| 381. |
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels. |
| A. | 3 |
| B. | 30 |
| C. | 70 |
| D. | 100 |
| Answer» B. 30 | |
| 382. |
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 | |
| 383. |
The earth's atmosphere is an envelope of gases present upto a height of about __________ kms. |
| A. | 10 |
| B. | 200 |
| C. | 1000 |
| D. | 2000 |
| Answer» C. 1000 | |
| 384. |
Presence of __________ hardness is responsible for the temporary hardness in water. |
| A. | carbonate |
| B. | calcium |
| C. | choride |
| D. | sulphate |
| Answer» C. choride | |
| 385. |
Reingleman chart is used for the evaluation of __________ pollution. |
| A. | air |
| B. | water |
| C. | noise |
| D. | radioactive |
| Answer» B. water | |
| 386. |
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. | |
| 387. |
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. | |
| 388. |
'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate' ? |
| A. | Dust & mists |
| B. | Smoke & fumes |
| C. | Photochemical smog & soot |
| D. | None of these |
| Answer» E. | |
| 389. |
Noise level in a quiet private business office is about __________ decibels. |
| A. | 25 |
| B. | 50 |
| C. | 70 |
| D. | 85 |
| Answer» C. 70 | |
| 390. |
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 | |
| 391. |
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 | |
| 392. |
Hydrogen ion concentration in distilled water is |
| A. | 43656 |
| B. | 7 x 10-7 |
| C. | 107 |
| D. | 7 x 107 |
| Answer» B. 7 x 10-7 | |
| 393. |
What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy and meat packing industries ? |
| A. | Radioactive substances |
| B. | Natural organic products |
| C. | Inorganic pollutants |
| D. | None of these |
| Answer» C. Inorganic pollutants | |
| 394. |
Maximum permissible turbidity in potable water is __________ ppm. |
| A. | 1 |
| B. | 10 |
| C. | 250 |
| D. | 1000 |
| Answer» C. 250 | |
| 395. |
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in |
| A. | coagulation and flocculation of colloids. |
| B. | oxidation of carbonaceous matter to CO2. |
| C. | nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 396. |
If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur. |
| A. | 50 |
| B. | 500 |
| C. | 1000 |
| D. | 3000 (i.e. 0.3%) |
| Answer» E. | |
| 397. |
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. | |
| 398. |
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.) | |
| 399. |
Which of the following is the most major constituents of air pollutants ? |
| A. | Oxides of sulphur |
| B. | Oxides of nitrogen |
| C. | Carbon monoxide |
| D. | Hydrogen sulphide |
| Answer» B. Oxides of nitrogen | |
| 400. |
The pH value of oxidised sewage is about |
| A. | 1.8 |
| B. | 6.2 |
| C. | 7.3 |
| D. | 13.4 |
| Answer» D. 13.4 | |