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.
| 351. |
_Algae growth in water is controlled by$? |
| A. | Deoxidation |
| B. | Chlorination |
| C. | Bleaching |
| D. | Aeration |
| Answer» C. Bleaching | |
| 352. |
_Presence of __________ bacteria in water causes disease like typhoid.$? |
| A. | Aerobic |
| B. | Pathogenic |
| C. | Anaerobic |
| D. | Non-pathogenic |
| Answer» C. Anaerobic | |
| 353. |
_Smog is not formed due to the presence of __________ in the atmosphere.$? |
| A. | SO‚ÇÇ |
| B. | NOx |
| C. | CO‚ÇÇ |
| D. | Any of these |
| Answer» D. Any of these | |
| 354. |
_Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?$? |
| A. | CO |
| B. | SO‚ÇÇ |
| C. | NOx |
| D. | CFC (chloro fluoro carbons) |
| Answer» B. SO‚Äö√á√á | |
| 355. |
_The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?$? |
| A. | Chlorine |
| B. | Alkalis |
| C. | Benzene hexachloride |
| D. | Alkyl benzene sulphonate (ABS) |
| Answer» B. Alkalis | |
| 356. |
_The pH value of oxidised sewage is about$? |
| A. | 1.8 |
| B. | 6.2 |
| C. | 7.3 |
| D. | 13.4 |
| Answer» D. 13.4 | |
| 357. |
_A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.$? |
| A. | 1000 to 2000 |
| B. | 3000 to 6000 |
| C. | 6000 to 9000 |
| D. | 10000 to 100000 |
| Answer» E. | |
| 358. |
_Tolerable limit of nitrogen oxides in air is __________ ppm.$? |
| A. | 0.1 |
| B. | 1 |
| C. | 5 |
| D. | 25 |
| Answer» D. 25 | |
| 359. |
_Iron & manganese present as pollutant in water can not be removed by$? |
| A. | Ion exchange process |
| B. | Oxidation followed by settling & filtration |
| C. | Lime soda process or manganese zeolite process |
| D. | Chlorination |
| Answer» E. | |
| 360. |
_Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of$? |
| A. | CO‚ÇÇ |
| B. | SO‚ÇÇ |
| C. | Hydrocarbons |
| D. | CFC (chloro fluoro carbon) |
| Answer» E. | |
| 361. |
_Which is a secondary air pollutant?$? |
| A. | Photochemical smog |
| B. | Sulphur dioxide |
| C. | Nitrogen dioxide |
| D. | Dust particles |
| Answer» B. Sulphur dioxide | |
| 362. |
_Direct reaction of unsaturated hydrocarbons with either NO or NO‚ÇÇ produces an eye irritating pollutant compound known as$? |
| A. | Photochemical smog |
| B. | Peroxy acetyl nitrate (PAN) or methyl nitrile |
| C. | Benzopyrene |
| D. | Poly acrylonitrile |
| Answer» C. Benzopyrene | |
| 363. |
_Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.$? |
| A. | <1 |
| B. | 10-100 |
| C. | 100-200 |
| D. | 100-1000 |
| Answer» B. 10-100 | |
| 364. |
_Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes$? |
| A. | Fire hazards |
| B. | Explosion hazards |
| C. | Persistent foam |
| D. | Depletion of dissolved oxygen |
| Answer» D. Depletion of dissolved oxygen | |
| 365. |
_Which of the following is not a practical method of low level radioactive waste disposal?$? |
| A. | Dilution with inert material |
| B. | Discharging to atmosphere through tall stacks after dilution |
| C. | Disposing off in rivers & oceans |
| D. | Filling in steel crates and shooting it off out of earth |
| Answer» E. | |
| 366. |
_In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)$? |
| 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 | |
| 367. |
_Fresh sewage is __________ in nature.$? |
| A. | Acidic |
| B. | Neutral |
| C. | Alkaline |
| D. | Highly acidic |
| Answer» D. Highly acidic | |
| 368. |
_The main type of sludge gas evolved during sewage treatment in Imhoff tank is$? |
| A. | CO‚ÇÇ |
| B. | CH‚ÇÑ |
| C. | CO |
| D. | H‚ÇÇ |
| Answer» C. CO | |
| 369. |
_Green house effect is accentuated by$? |
| A. | Deforestation |
| B. | Rapid industrialisation |
| C. | Increased transportation activity |
| D. | All of the above |
| Answer» E. | |
| 370. |
_Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes$? |
| A. | Paralysis of muscles & loss of appetite |
| B. | Nervous depression |
| C. | Gastritis & diarrhea |
| D. | All of the above |
| Answer» E. | |
| 371. |
_Which of the following is not a source of ozone emission in the atmosphere?$? |
| A. | Refrigerators |
| B. | Xerox machines |
| C. | Dermatological photo-therapy equipments |
| D. | High voltage electrical equipments |
| Answer» B. Xerox machines | |
| 372. |
_Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in$? |
| A. | Food industry |
| B. | Municipal sewage treatment |
| C. | Petroleum refinery |
| D. | Iron & steel plant |
| Answer» B. Municipal sewage treatment | |
| 373. |
_Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called$? |
| A. | Grit |
| B. | Dust |
| C. | Powder |
| D. | Smoke |
| Answer» B. Dust | |
| 374. |
_A shallow pond in which the sewage is retained and biologically treated is called$? |
| A. | Oxidation |
| B. | Imhoff tank |
| C. | Lagoon |
| D. | Skimming tank |
| Answer» B. Imhoff tank | |
| 375. |
_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$? |
| A. | Ozone and iodine |
| B. | Chlorine or its compounds |
| C. | Ultraviolet light for irradiation of water |
| D. | All of the above |
| Answer» E. | |
| 376. |
_White smoke coming out of the chimney of a furnace indicates the use of$? |
| 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 | |
| 377. |
_Presence of soluble organics in polluted water causes$? |
| A. | Undesirable plants growth |
| B. | Depletion of oxygen |
| C. | Fire hazards |
| D. | Explosion hazards |
| Answer» C. Fire hazards | |
| 378. |
_Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.$? |
| A. | 1 |
| B. | 7 |
| C. | 19 |
| D. | 82 |
| Answer» C. 19 | |
| 379. |
_TLV of NO‚ÇÇ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO‚ÇÇ causes$? |
| A. | Skin disorder |
| B. | Bronchitis |
| C. | Bone disease |
| D. | Cancer |
| Answer» C. Bone disease | |
| 380. |
_The upper layer of atmosphere is called the$? |
| A. | Stratosphere |
| B. | Troposphere |
| C. | Ionosphere |
| D. | None of these |
| Answer» B. Troposphere | |
| 381. |
_Radioactive solid nuclear wastes are disposed off by$? |
| A. | High temperature incineration |
| B. | Pathological incineration |
| C. | Pyrolysis |
| D. | Underground burial in concrete containers |
| Answer» E. | |
| 382. |
_Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes$? |
| A. | Foaming |
| B. | Odour nuisances |
| C. | Undesirable plant growth |
| D. | Turbidity |
| Answer» D. Turbidity | |
| 383. |
_Exposure to chemicals having carcinogenic properties cause$? |
| A. | Dermatitis (skin disorder) |
| B. | Cancer |
| C. | Asphyxiation |
| D. | Asthma |
| Answer» C. Asphyxiation | |
| 384. |
_Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO‚ÇÇ in air is __________ ppm.$? |
| A. | 5 |
| B. | 500 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 500 | |
| 385. |
_In a sedimentation tank, the detention period for water ranges from __________ hours.$? |
| A. | 2 to 4 |
| B. | 8 to 12 |
| C. | 16 to 20 |
| D. | 24 to 32 |
| Answer» B. 8 to 12 | |
| 386. |
_Septic tanks are used for the __________ of the deposited solids.$? |
| A. | Separation |
| B. | Anaerobic decomposition |
| C. | Aerobic decomposition |
| D. | None of these |
| Answer» C. Aerobic decomposition | |
| 387. |
_Peroxyacyl nitrate (PAN), a pollutant is found in the$? |
| A. | Automobile exhaust |
| B. | Flue gas of coal based power plant |
| C. | Exhaust of nitric acid plant |
| D. | Exhaust of sulphuric acid plant |
| Answer» B. Flue gas of coal based power plant | |
| 388. |
_Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.$? |
| A. | Reduce SO‚ÇÇ content in |
| B. | Catalytically convert SO‚ÇÇ to SO‚ÇÉ in |
| C. | Increase the dew point of |
| D. | None of these |
| Answer» B. Catalytically convert SO‚Äö√á√á to SO‚Äö√á√â in | |
| 389. |
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.$? |
| A. | 10000 |
| B. | 5 |
| C. | 500 |
| D. | 1000 |
| Answer» C. 500 | |
| 390. |
Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?$? |
| A. | Smog & ozone |
| B. | Hydrogen fluoride & nitrogen oxides |
| C. | Sulphur dioxide & spray of weed killers |
| D. | Carbon monoxide |
| Answer» E. | |
| 391. |
Maximum permissible residual chlorine in treated water should be __________ mg/litre.$? |
| A. | 0.001 to 0.01 |
| B. | 02 to 0.3 |
| C. | 2 to 3 |
| D. | 5 to 10 |
| Answer» C. 2 to 3 | |
| 392. |
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the$? |
| A. | Bacterial stability factor |
| B. | Relative stability |
| C. | Biological oxygen demand (BOD) |
| D. | Oxygen ion concentration |
| Answer» C. Biological oxygen demand (BOD) | |
| 393. |
In the context of the chemical process industries, the term BOD is normally associated with the$? |
| A. | Characterisation of solid wastes |
| B. | Organic concentration in gaseous effluents |
| C. | Characterisation of liquid effluents |
| D. | Characterisation of boiler feed water |
| Answer» D. Characterisation of boiler feed water | |
| 394. |
Most of the bacteria in sewage are$? |
| A. | Parasitic |
| B. | Saprophytic |
| C. | Anerobic |
| D. | None of these |
| Answer» C. Anerobic | |
| 395. |
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.$? |
| A. | 25 |
| B. | 50 |
| C. | 80 |
| D. | 120 |
| Answer» D. 120 | |
| 396. |
A standard test for determination of hardness in water is termed as __________ test.$? |
| A. | EDTA |
| B. | Electometric |
| C. | Total count |
| D. | Presumptive |
| Answer» B. Electometric | |
| 397. |
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)$? |
| A. | Acts as a green house gas thereby raising earth's temperature |
| B. | Causes asphyxia |
| C. | Causes increase in sea level |
| D. | Inhances the green house effect |
| Answer» C. Causes increase in sea level | |
| 398. |
Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.$? |
| A. | 85 |
| B. | 105 |
| C. | 125 |
| D. | 145 |
| Answer» C. 125 | |
| 399. |
Turbidity of water is an indication of the presence of$? |
| A. | Suspended inorganic matter |
| B. | Dissolved solids |
| C. | Floating solids |
| D. | Dissolved gases |
| Answer» B. Dissolved solids | |
| 400. |
The principal gas evolved from sludge digestion tank is$? |
| A. | CO |
| B. | CO‚ÇÇ |
| C. | CH‚ÇÑ |
| D. | N‚ÇÇ |
| Answer» D. N‚Äö√á√á | |