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.
| 401. |
Lagooning process is mainly a means of the$? |
| A. | Sludge disposal |
| B. | Reduction of excessive flow in sewers |
| C. | Biological treatment of wastes |
| D. | None of these |
| Answer» B. Reduction of excessive flow in sewers | |
| 402. |
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the$? |
| A. | Ionosphere |
| B. | Troposphere |
| C. | Stratosphere |
| D. | None of these |
| Answer» C. Stratosphere | |
| 403. |
Which of the following is not a secondary air pollutant?$? |
| A. | Ozone |
| B. | Photochemical smog |
| C. | Sulphur dioxide |
| D. | All of the above |
| Answer» D. All of the above | |
| 404. |
'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate'?$? |
| A. | Dust & mists |
| B. | Smoke & fumes |
| C. | Photochemical smog & soot |
| D. | None of these |
| Answer» E. | |
| 405. |
High noise level in a chemical plant can be controlled by the$? |
| A. | Suppression of noise at the source itself |
| B. | Path control of noise |
| C. | Protection of operating personnel |
| D. | All of the above |
| Answer» E. | |
| 406. |
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?$? |
| A. | Lagooning |
| B. | Activated carbon adsorption |
| C. | Biological oxidation pond |
| D. | Chemical coagulation |
| Answer» C. Biological oxidation pond | |
| 407. |
Salt content in sea water is about __________ percent.$? |
| A. | 0.5 |
| B. | 1 |
| C. | 3.5 |
| D. | 10 |
| Answer» D. 10 | |
| 408. |
Growth of __________ is promoted by the presence of manganese in water.$? |
| A. | Files |
| B. | Algae |
| C. | Micro-organisms |
| D. | Mosquitoes |
| Answer» D. Mosquitoes | |
| 409. |
Which of the following is a manmade source of air pollution?? |
| A. | Automobile exhaust |
| B. | Forest fire |
| C. | Bacterial action in soil and swamp areas |
| D. | All of the above |
| Answer» B. Forest fire | |
| 410. |
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.? |
| A. | 2 |
| B. | 42 |
| C. | 332 |
| D. | 1050 |
| Answer» C. 332 | |
| 411. |
Maximum permissible turbidity in potable water is __________ ppm.? |
| A. | 1 |
| B. | 10 |
| C. | 250 |
| D. | 1000 |
| Answer» C. 250 | |
| 412. |
__________ plant emits large amount of SO‚ÇÇ as an air pollutant.? |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Chloralkali |
| D. | Iron & steel |
| Answer» C. Chloralkali | |
| 413. |
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the? |
| A. | Ionosphere |
| B. | Troposphere |
| C. | Stratosphere |
| D. | None of these |
| Answer» C. Stratosphere | |
| 414. |
Which of the following is not a secondary air pollutant?? |
| A. | Ozone |
| B. | Photochemical smog |
| C. | Sulphur dioxide |
| D. | All of the above |
| Answer» D. All of the above | |
| 415. |
Lagooning process is mainly a means of the? |
| A. | Sludge disposal |
| B. | Reduction of excessive flow in sewers |
| C. | Biological treatment of wastes |
| D. | None of these |
| Answer» B. Reduction of excessive flow in sewers | |
| 416. |
Salt content in sea water is about __________ percent.? |
| A. | 0.5 |
| B. | 1 |
| C. | 3.5 |
| D. | 10 |
| Answer» D. 10 | |
| 417. |
Growth of __________ is promoted by the presence of manganese in water.? |
| A. | Files |
| B. | Algae |
| C. | Micro-organisms |
| D. | Mosquitoes |
| Answer» D. Mosquitoes | |
| 418. |
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 of the above |
| Answer» E. | |
| 419. |
'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. | |
| 420. |
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?? |
| A. | Lagooning |
| B. | Activated carbon adsorption |
| C. | Biological oxidation pond |
| D. | Chemical coagulation |
| Answer» C. Biological oxidation pond | |
| 421. |
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 | |
| 422. |
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 of the above |
| Answer» E. | |
| 423. |
Radioactive substances present in the polluted water stream can be removed by? |
| A. | Biological oxygen treatment |
| B. | Coagulation and filtration |
| C. | Adsorption in ion exchange materials |
| D. | None of these |
| Answer» D. None of these | |
| 424. |
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.? |
| A. | Dissolved oxygen content |
| B. | Biological oxygen demand |
| C. | Vapor pressure |
| D. | All of the above |
| Answer» B. Biological oxygen demand | |
| 425. |
Which of the following is the most detrimental for water used in high pressure boiler?? |
| A. | Silica |
| B. | Turbidity |
| C. | Phenol |
| D. | Dissolved oxygen |
| Answer» B. Turbidity | |
| 426. |
Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas? |
| A. | Packed scrubber |
| B. | Gravity settling chamber |
| C. | Electrostatic precipitator |
| D. | Hydrocyclone |
| Answer» D. Hydrocyclone | |
| 427. |
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant? |
| A. | Mercury |
| B. | Arsenic |
| C. | Aluminium |
| D. | Lead |
| Answer» D. Lead | |
| 428. |
TLV of ozone (O‚ÇÉ) and phosgene (COCl‚ÇÇ) in air is __________ ppm.$ |
| A. | 0.1 |
| B. | 25 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 25 | |
| 429. |
H‚ÇÇS present in gaseous stream can be removed by adsorption on$ |
| A. | Silica gel |
| B. | Active carbon |
| C. | Bog iron |
| D. | Limestone powder |
| Answer» D. Limestone powder | |
| 430. |
The maximum CO‚ÇÇ is emitted into the atmosphere by$ |
| A. | Combustion |
| B. | Urea |
| C. | Biomass burning |
| D. | Trees |
| Answer» B. Urea | |
| 431. |
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 | |
| 432. |
TLV of aldrin in public water supply system is about __________ μg/litre.$ |
| A. | 0.5 |
| B. | 17 |
| C. | 357 |
| D. | 1097 |
| Answer» C. 357 | |
| 433. |
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 | |
| 434. |
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 | |
| 435. |
Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants? |
| A. | NOx |
| B. | Hg |
| C. | SO‚ÇÇ |
| D. | F |
| Answer» D. F | |
| 436. |
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas? |
| A. | Hydrogen |
| B. | Acetylene |
| C. | Carbon monoxide |
| D. | Ammonia |
| Answer» C. Carbon monoxide | |
| 437. |
Which of the following is not a natural source of air pollution? |
| A. | Volcanic eruptions and lightening discharges |
| B. | Biological decay of vegetable matter |
| C. | Photochemical oxidation of organic matter |
| D. | None of these |
| Answer» E. | |
| 438. |
Exposure to SO‚ÇÇ containing chimney gases results in the# |
| A. | Reduction in strength of leather & cloth |
| B. | Acceleration of corrosion rates of metals |
| C. | Increased drying & hardening time of paints |
| D. | All of the above |
| Answer» E. | |
| 439. |
Which is the most widely used coagulant for the treatment of turbid water? |
| A. | Alum (aluminium sulphate) |
| B. | Lime |
| C. | Ferric chloride |
| D. | Sodium aluminate |
| Answer» B. Lime | |
| 440. |
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 | |
| 441. |
Which of the following pollutants, if present in atmosphere is detectable by its odour? |
| A. | CO |
| B. | SO‚ÇÇ |
| C. | NO‚ÇÇ |
| D. | CO‚ÇÇ |
| Answer» C. NO‚Äö√á√á | |
| 442. |
Higher concentration of CO‚ÇÇ 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 |
| D. | All of the above |
| Answer» E. | |
| 443. |
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. | |
| 444. |
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.# |
| A. | 10 to 20 |
| B. | 100 to 200 |
| C. | 1500 to 2500 |
| D. | 4000 to 5000 |
| Answer» C. 1500 to 2500 | |