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.
| 451. |
Growth of __________ is promoted by the presence of manganese in water. |
| A. | files |
| B. | algae |
| C. | micro-organisms |
| D. | mosquitoes |
| Answer» D. mosquitoes | |
| 452. |
Siderosis is a disease caused by the inhalation of __________ dust. |
| A. | coal |
| B. | silica |
| C. | iron |
| D. | none of these |
| Answer» D. none of these | |
| 453. |
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. | |
| 454. |
Which of the following is the most widely used disinfectant in water treatment ? |
| A. | Chlorine |
| B. | Irradiation of water by ultraviolet light |
| C. | Cation exchanger |
| D. | Coagulation |
| Answer» B. Irradiation of water by ultraviolet light | |
| 455. |
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 | |
| 456. |
TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm. |
| A. | 0.1 |
| B. | 25 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 25 | |
| 457. |
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is |
| A. | inversely proportional to viscosity of gas. |
| B. | proportional to the viscosity & density of the gas. |
| C. | proportional to the pressure of the gas. |
| D. | both (b) and (c). |
| Answer» E. | |
| 458. |
Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes |
| A. | blood poisoning. |
| B. | anaemia. |
| C. | nervous system disorder. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 459. |
Removal of __________ results from the disinfection of water. |
| A. | turbidity |
| B. | odour |
| C. | hardness |
| D. | bacteria |
| Answer» E. | |
| 460. |
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 | |
| 461. |
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 (a), (b) & (c). |
| Answer» E. | |
| 462. |
Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes |
| A. | blood poisoning. |
| B. | anaemia. |
| C. | nervous system disorder. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 463. |
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the |
| A. | industrial chimney exhaust. |
| B. | automobiles exhaust. |
| C. | photochemical reaction in polluted atmosphere. |
| D. | burning of domestic fuel. |
| Answer» C. photochemical reaction in polluted atmosphere. | |
| 464. |
Tolerable limit of nitrogen oxides in air is __________ ppm. |
| A. | 0.1 |
| B. | 1 |
| C. | 5 |
| D. | 25 |
| Answer» D. 25 | |
| 465. |
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 | |
| 466. |
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 | |
| 467. |
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. | |
| 468. |
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it. |
| A. | coal ash |
| B. | potassium cyanide |
| C. | ortho-xylene |
| D. | none of these |
| Answer» C. ortho-xylene | |
| 469. |
Global warming may result in |
| A. | flood |
| B. | cyclone |
| C. | decrease in food productivity |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 470. |
__________ is the process of killing organism in water. |
| A. | Coagulation |
| B. | Sterilisation |
| C. | Disinfection |
| D. | Sedimentation |
| Answer» D. Sedimentation | |
| 471. |
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 | |
| 472. |
Dust collection efficiency of a cyclone separator depends upon its |
| A. | diameter. |
| B. | inlet gas velocity. |
| C. | overall height. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 473. |
Beyond what concentration of H2S in air, acute danger to human life exists ? |
| A. | 50 ppm |
| B. | 100 ppm |
| C. | 300 ppm |
| D. | 700 ppm |
| Answer» E. | |
| 474. |
Reingleman chart No. 2 corresponds to __________ percent black smoke. |
| A. | 10 |
| B. | 20 |
| C. | 40 |
| D. | 80 |
| Answer» D. 80 | |
| 475. |
Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm. |
| A. | 20 |
| B. | 100 |
| C. | 400 |
| D. | 200 |
| Answer» D. 200 | |
| 476. |
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by |
| A. | chlorination |
| B. | treating in biological oxygen pond |
| C. | chemical coagulation |
| D. | none of these |
| Answer» C. chemical coagulation | |
| 477. |
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 | |
| 478. |
Polluted water having low BOD are most economically treated in |
| A. | sedimentation tanks |
| B. | oxidation ponds |
| C. | sludge digester |
| D. | clarifier |
| Answer» C. sludge digester | |
| 479. |
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). | |
| 480. |
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause |
| A. | explosion |
| B. | non biodegradable foam |
| C. | undesirable plant growth |
| D. | corrosion |
| Answer» B. non biodegradable foam | |
| 481. |
Tri-sodium phosphate is used in boiler water treatment to reduce |
| A. | turbidity |
| B. | caustic embrittlement |
| C. | suspended silica |
| D. | dissolved oxygen |
| Answer» C. suspended silica | |
| 482. |
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 | |
| 483. |
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm. |
| A. | 5 |
| B. | 500 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 500 | |
| 484. |
The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the |
| A. | catalytic conversion |
| B. | green house effect |
| C. | global warming |
| D. | both (b) and (c) |
| Answer» E. | |
| 485. |
Main pollutants released from iron & steel industry is |
| A. | CO, CO2 & SO2. |
| B. | H2S, NO & SO3. |
| C. | CO2, H2S & NO2. |
| D. | SO3, NO2 & CO2. |
| Answer» B. H2S, NO & SO3. | |
| 486. |
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by |
| A. | biological oxidation. |
| B. | skimming off. |
| C. | settling out using chemical reagents. |
| D. | chlorination. |
| Answer» D. chlorination. | |
| 487. |
Insufficient washing of sand grains in a rapid sand filter causes |
| A. | air binding |
| B. | shrinkage of filtering media |
| C. | mud balls |
| D. | expansion of filtering media |
| Answer» D. expansion of filtering media | |
| 488. |
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU). |
| A. | 20 |
| B. | 230 |
| C. | 750 |
| D. | 1500 |
| Answer» C. 750 | |
| 489. |
Pick out the one which is not a chemical coagulant. |
| A. | Aluminium sulphate |
| B. | Ferrous sulphate |
| C. | Hydrated lime |
| D. | Chloramine |
| Answer» E. | |
| 490. |
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 | |
| 491. |
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is |
| A. | neutralised by alkali treatment. |
| B. | left as such without any treatment. |
| C. | diluted with fresh water to reduce its acidity. |
| D. | none of these. |
| Answer» B. left as such without any treatment. | |
| 492. |
The common pollutant generated in chlor-alkali industry and battery manufacture is |
| A. | mercury |
| B. | brine |
| C. | phosphate |
| D. | none of these |
| Answer» B. brine | |
| 493. |
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. | |
| 494. |
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels. |
| A. | 60 |
| B. | 90 |
| C. | 105 |
| D. | 120 |
| Answer» C. 105 | |
| 495. |
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 (a), (b) and (c). |
| Answer» B. Forest fire. | |
| 496. |
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel. |
| A. | 1 |
| B. | 5 |
| C. | 10 |
| D. | 20 |
| Answer» B. 5 | |
| 497. |
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 (a), (b) & (c). |
| Answer» E. | |
| 498. |
Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for |
| A. | conversion of CO into CO2 in the second compartment. |
| B. | conversion of NOx into N2 and NH3 in the first compartment. |
| C. | oxidation of unburnt hydrocarbon fuel in the second compartment. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 499. |
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 | |
| 500. |
Presence of iron and manganese in water causes |
| A. | reduction in its dissolved oxygen content. |
| B. | discoloration of bathroom fixtures. |
| C. | temporary hardness. |
| D. | none of these. |
| Answer» C. temporary hardness. | |