MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 227 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
Workers working in _______________ industry are most prone to white lung cancer? |
| A. | Coal mining |
| B. | Limestone mining |
| C. | Textile |
| D. | Asbestos |
| Answer» D. Asbestos | |
| 3. |
World environment day is observed every year on the 5th of___________________? |
| A. | June |
| B. | December |
| C. | July |
| D. | September |
| Answer» B. December | |
| 4. |
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. | Pennsylvania (U.S.A.) |
| D. | Moscow (U.S.S.R.) |
| Answer» C. Pennsylvania (U.S.A.) | |
| 5. |
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. | |
| 6. |
Which of the following is an adsorbent used for the removal of SO2 from gas/air ? |
| A. | Bog iron |
| B. | Limestone powder or alkalised alumina |
| C. | Silica gel |
| D. | Active carbon |
| Answer» C. Silica gel | |
| 7. |
Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ? |
| A. | Active carbon |
| B. | Silica gel |
| C. | Bog iron (iron oxide) |
| D. | Pulverised limestone |
| Answer» C. Bog iron (iron oxide) | |
| 8. |
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas ? |
| A. | Hydrogen |
| B. | Acetylene |
| C. | Carbon monoxide |
| D. | Ammonia |
| Answer» C. Carbon monoxide | |
| 9. |
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. | |
| 10. |
Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ? |
| A. | Packed scrubber |
| B. | Gravity settling chamber |
| C. | Electrostatic precipitator |
| D. | Hydrocyclone |
| Answer» D. Hydrocyclone | |
| 11. |
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 | |
| 12. |
When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell? |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 4 |
| Answer» E. | |
| 13. |
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 | |
| 14. |
Water filtration rate in a rapid sand filter ranges from ______________ kilolitres/m2/hr? |
| A. | 0.1 to 1 |
| B. | 3 to 6 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» C. 10 to 15 | |
| 15. |
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 | |
| 16. |
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 | |
| 17. |
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 | |
| 18. |
Tolerable limit of nitrogen oxides in air is _____________ ppm? |
| A. | 0.1 |
| B. | 1 |
| C. | 5 |
| D. | 25 |
| Answer» D. 25 | |
| 19. |
TLV of lead for public sewer/waste water is about ______________ ppm? |
| A. | 1 |
| B. | 25 |
| C. | 150 |
| D. | 650 |
| Answer» B. 25 | |
| 20. |
TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm? |
| A. | 0.1 |
| B. | 25 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 25 | |
| 21. |
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 | |
| 22. |
TLV of mercury in potable (drinking) water is about ______________ ppm? |
| A. | 0.001 |
| B. | 0.1 |
| C. | 1 |
| D. | 5 |
| Answer» B. 0.1 | |
| 23. |
TLV of aldrin in public water supply system is about ____________ μg/litre? |
| A. | 0.5 |
| B. | 17 |
| C. | 357 |
| D. | 1097 |
| Answer» C. 357 | |
| 24. |
TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ? |
| A. | 5 |
| B. | 100 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 100 | |
| 25. |
Threshold limit value (TLV) of CO in air is _____________ ppm? |
| A. | 5 |
| B. | 50 |
| C. | 2000 |
| D. | 5000 |
| Answer» C. 2000 | |
| 26. |
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 | |
| 27. |
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 | |
| 28. |
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 | |
| 29. |
Thermal pollution due to excessive heat & temperature in the working place causes__________________? |
| A. | Reduction in working efficiency of manpower |
| B. | Fatigue |
| C. | High breathing rate |
| D. | All A., B. & C. |
| Answer» E. | |
| 30. |
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth’s surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about _____________ °C/km? |
| A. | 0.05 |
| B. | 1 |
| C. | 6.5 |
| D. | 15 |
| Answer» D. 15 | |
| 31. |
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 | |
| 32. |
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. | 50 |
| Answer» B. 5 | |
| 33. |
The upper layer of atmosphere is called the ____________________? |
| A. | Stratosphere |
| B. | Troposphere |
| C. | Ionosphere |
| D. | None of these |
| Answer» B. Troposphere | |
| 34. |
The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria? |
| A. | Anaerobic |
| B. | Saprophytic |
| C. | Aerobic |
| D. | Parasitic |
| Answer» D. Parasitic | |
| 35. |
The term Biological Oxygen Demand (BOD) is used in relation to ______________________? |
| A. | Potable water |
| B. | Cooling water |
| C. | Distilled water |
| D. | Industrial effluents |
| Answer» E. | |
| 36. |
The resistance of water to the passage of light through it is a measure of the___________________? |
| A. | Turbidity |
| B. | Color |
| C. | Hardness |
| D. | Dissolved gases |
| Answer» B. Color | |
| 37. |
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) | |
| 38. |
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 | |
| 39. |
The pH value of potable water should be between____________________? |
| A. | 1 to 1.5 |
| B. | 6.5 to 8 |
| C. | 13 to 14 |
| D. | 4 to 5 |
| Answer» C. 13 to 14 | |
| 40. |
The pH value of oxidised sewage is about_____________________? |
| A. | 1.8 |
| B. | 6.2 |
| C. | 7.3 |
| D. | 13.4 |
| Answer» D. 13.4 | |
| 41. |
The most commonly used chemical coagulant in water treatment is________________? |
| A. | Ferrous sulphate |
| B. | Alum |
| C. | Lime |
| D. | Hydrazine |
| Answer» C. Lime | |
| 42. |
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 | |
| 43. |
The maximum CO2 is emitted into the atmosphere by_________________? |
| A. | Combustion |
| B. | Urea |
| C. | Biomass burning |
| D. | Trees |
| Answer» B. Urea | |
| 44. |
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________? |
| A. | Pipe vibrations |
| B. | Cavitation |
| C. | Boundary layer separation |
| D. | Fluctuation in liquid flow |
| Answer» C. Boundary layer separation | |
| 45. |
The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________? |
| A. | CO2 |
| B. | CH4 |
| C. | CO |
| D. | H2 |
| Answer» C. CO | |
| 46. |
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________? |
| A. | Biological oxygen pond |
| B. | Aerated lagoons |
| C. | Trickling filters |
| D. | Gravity separator having oil skimming devices |
| Answer» E. | |
| 47. |
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 | |
| 48. |
The lowest layer of atmosphere is known as the_____________________? |
| A. | Stratosphere |
| B. | Troposphere |
| C. | Ionosphere |
| D. | None of these |
| Answer» C. Ionosphere | |
| 49. |
The Killer gas which caused Bhopal gas tragedy in 1984 was________________? |
| A. | Phosgene |
| B. | Methyl isocyanate (MIC) |
| C. | Carbon monoxide |
| D. | Sulphur dioxide |
| Answer» C. Carbon monoxide | |
| 50. |
The function of skimming tank in sewage treatment is to remove _____________ substances? |
| A. | Dissolved solid |
| B. | Suspended solid |
| C. | Oil & fatty |
| D. | Gritty & inorganic |
| Answer» D. Gritty & inorganic | |