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.
| 401. |
A man exposed to excessive noise level in the working environment may suffer from |
| A. | hearing loss |
| B. | rupture of ear drum |
| C. | nervousness & fatigue |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 402. |
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. | |
| 403. |
Disinfection of water is done to remove |
| A. | color |
| B. | bad taste |
| C. | foul odour |
| D. | bacteria |
| Answer» E. | |
| 404. |
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 | |
| 405. |
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 | |
| 406. |
Photochemical smog is formed from automobile exhaust |
| A. | by reaction of hydrocarbon & nitric oxide in presence of sunlight. |
| B. | appears only on sunny days. |
| C. | is harmful for crops and trees also besides causing eye irritation & asthma. |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 407. |
Main pollutant present in automobile exhaust is |
| A. | CO |
| B. | CO2 |
| C. | NO |
| D. | hydrocarbons |
| Answer» B. CO2 | |
| 408. |
__________ 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 | |
| 409. |
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. | |
| 410. |
'Pneumoconiosis' is a disease caused by the inhalation of __________ dust. |
| A. | coal |
| B. | uranium ore |
| C. | iron ore |
| D. | lime |
| Answer» B. uranium ore | |
| 411. |
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. | |
| 412. |
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million). |
| A. | 0.002 |
| B. | 0.2 |
| C. | 1.2 |
| D. | 4.8 |
| Answer» C. 1.2 | |
| 413. |
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?$ |
| A. | I-131 |
| B. | Sr-90 |
| C. | Au-198 |
| D. | Ra-226 |
| Answer» E. | |
| 414. |
Workers working in __________ industry are most prone to white lung cancer. |
| A. | coal mining |
| B. | limestone mining |
| C. | textile |
| D. | asbestos |
| Answer» D. asbestos | |
| 415. |
80% less than 200 mesh size particles are called |
| A. | smoke |
| B. | powder |
| C. | grit |
| D. | aggregates |
| Answer» C. grit | |
| 416. |
Presence of __________ bacteria in water causes disease like typhoid. |
| A. | aerobic |
| B. | pathogenic |
| C. | anaerobic |
| D. | non-pathogenic |
| Answer» C. anaerobic | |
| 417. |
TLV of mercury in potable (drinking) water is about __________ ppm. |
| A. | 0.001 |
| B. | 0.1 |
| C. | 1 |
| D. | 5 |
| Answer» B. 0.1 | |
| 418. |
Which of the following is not a secondary air pollutant ? |
| A. | Ozone |
| B. | Photochemical smog |
| C. | Sulphur dioxide |
| D. | All (a), (b) & (c) |
| Answer» D. All (a), (b) & (c) | |
| 419. |
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 | |
| 420. |
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 | |
| 421. |
On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because |
| A. | of clotting of blood. |
| B. | of jamming of respiratory tract. |
| C. | it forms carboxyhaemoglobin by combining with haemoglobin of blood, thereby making it incapable of absorbing oxygen. |
| D. | it forms CO2 by combining with oxygen present in the blood. |
| Answer» D. it forms CO2 by combining with oxygen present in the blood. | |
| 422. |
Aerosols present in atmospheric air may be |
| A. | positively charged. |
| B. | negatively charged. |
| C. | neutral. |
| D. | combination of all (a), (b) & (c). |
| Answer» E. | |
| 423. |
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal |
| A. | by chemical coagulation. |
| B. | in sedimentation tanks equipped with mechanical scrapper. |
| C. | in vacuum filter. |
| D. | in clarifiers. |
| Answer» C. in vacuum filter. | |
| 424. |
Out of the following, TLV of __________ is maximum (about 500 ppm). |
| A. | carbon dioxide |
| B. | toluene |
| C. | carbon disulphide |
| D. | acetaldehyde |
| Answer» B. toluene | |
| 425. |
Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ? |
| A. | NOx |
| B. | Hg |
| C. | SO2 |
| D. | F |
| Answer» D. F | |
| 426. |
Average human body contains about __________ percent water by weight. |
| A. | 20 |
| B. | 40 |
| C. | 70 |
| D. | 85 |
| Answer» D. 85 | |
| 427. |
High noise level in a chemical plant can be controlled by the |
| A. | suppression of noise at the source itself. |
| B. | path control of noise. |
| C. | protection of operating personnel. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 428. |
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) | |
| 429. |
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. | |
| 430. |
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 | |
| 431. |
Fresh sewage is __________ in nature. |
| A. | acidic |
| B. | neutral |
| C. | alkaline |
| D. | highly acidic |
| Answer» D. highly acidic | |
| 432. |
Presence of excess flourine in water causes |
| A. | dental cavity |
| B. | tooth decay |
| C. | fluorosis |
| D. | respiratory disease |
| Answer» D. respiratory disease | |
| 433. |
Aerobic biological oxidation ponds used for the purification of polluted water |
| A. | destroys/removes pathogen from the sewage. |
| B. | is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents. |
| C. | destroys/removes pathogen much more effectively if the sewage is chlorinated. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 434. |
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water. |
| A. | mercury |
| B. | lead |
| C. | fluoride |
| D. | arsenic |
| Answer» D. arsenic | |
| 435. |
Most of the bacteria in sewage are |
| A. | parasitic |
| B. | saprophytic |
| C. | anerobic |
| D. | none of these |
| Answer» C. anerobic | |
| 436. |
Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ? |
| A. | Dust catcher (gravity type) |
| B. | Cyclone separator |
| C. | Bag filter |
| D. | Hollow wet scrubber |
| Answer» B. Cyclone separator | |
| 437. |
Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by |
| A. | natural aeration of water stream. |
| B. | photosynthetic action of algae. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 438. |
Which of the following pollutants is not emitted during volcanic eruptions ? |
| A. | SO2 |
| B. | H2S |
| C. | CO |
| D. | hydrocarbons |
| Answer» E. | |
| 439. |
Which is a secondary air pollutant ? |
| A. | Photochemical smog |
| B. | Sulphur dioxide |
| C. | Nitrogen dioxide |
| D. | Dust particles |
| Answer» B. Sulphur dioxide | |
| 440. |
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 | |
| 441. |
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air. |
| A. | hydrocarbons |
| B. | hydrogen flouride |
| C. | hydrogen sulphides |
| D. | nitrogen dioxide |
| Answer» C. hydrogen sulphides | |
| 442. |
The widest explosive limit is of __________ , thereby making it the most explosive gas. |
| A. | acetylene |
| B. | petrol vapor |
| C. | hydrogen |
| D. | carbon monoxide |
| Answer» B. petrol vapor | |
| 443. |
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 | |
| 444. |
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. | |
| 445. |
Green house effect is accentuated by |
| A. | deforestation. |
| B. | rapid industrialisation. |
| C. | increased transportation activity. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 446. |
Foul odour and bad taste of water is removed by treating with |
| A. | alum |
| B. | bleaching powder |
| C. | activated carbon |
| D. | copper sulphate. |
| Answer» D. copper sulphate. | |
| 447. |
Higher concentration of nitrogen dioxide in atmospheric air causes |
| A. | cancer |
| B. | bronchitis |
| C. | asphyxiation |
| D. | corrosion |
| Answer» C. asphyxiation | |
| 448. |
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 | |
| 449. |
In water treatment, alum[Al2(SO4)3] is used for the process of |
| A. | filtration |
| B. | coagulation |
| C. | sedimentation |
| D. | disinfection |
| Answer» C. sedimentation | |
| 450. |
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes |
| A. | poor visibility due to sky darkening. |
| B. | irritation in eyes. |
| C. | respiratory trouble. |
| D. | all (a), (b) and (c). |
| Answer» E. | |