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.
| 1. |
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. | O |
| B. | O₂ |
| C. | Ox |
| D. | FC (chloro fluoro carbons) |
| Answer» B. O₂ | |
| 2. |
'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate'? |
| A. | ust & mists |
| B. | moke & fumes |
| C. | hotochemical smog & soot |
| D. | one of these |
| Answer» E. | |
| 3. |
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream? |
| A. | edimentation tank |
| B. | ircular clarifier |
| C. | echanical flocculation |
| D. | hemical coagulation |
| Answer» E. | |
| 4. |
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. | 00 |
| B. | 000 |
| C. | 00 |
| D. | 000 |
| Answer» C. 00 | |
| 5. |
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones. |
| A. | 0² |
| B. | 0⁵ |
| C. | 0⁹ |
| D. | 0¹⁵ |
| Answer» C. 0⁹ | |
| 6. |
BOD of raw municipal sewage may be in the range of about __________ mg/litre. |
| A. | 1-2 |
| B. | 5-10 |
| C. | 150-300 |
| D. | 2000-3000 |
| Answer» D. 2000-3000 | |
| 7. |
COD of raw municipal sewage may be in the range of about __________ mg/litre. |
| A. | 1-2 |
| B. | 5-10 |
| C. | 90-120 |
| D. | 1500-2500 |
| Answer» D. 1500-2500 | |
| 8. |
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 | |
| 9. |
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated. |
| A. | Decreases |
| B. | Increases |
| C. | Remains constant |
| D. | May increase or decrease ; depends on the chemical characteristics of polluted water |
| Answer» B. Increases | |
| 10. |
__________ 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 | |
| 11. |
Most of the bacteria in sewage are |
| A. | Parasitic |
| B. | Saprophytic |
| C. | Anerobic |
| D. | None of these |
| Answer» C. Anerobic | |
| 12. |
The lowest layer of atmosphere is known as the |
| A. | Stratosphere |
| B. | Troposphere |
| C. | Ionosphere |
| D. | None of these |
| Answer» C. Ionosphere | |
| 13. |
Which of the following is the most lethal water pollutant? |
| A. | Phenol and cynide |
| B. | Chlorine |
| C. | Alkalis |
| D. | Suspended solids |
| Answer» B. Chlorine | |
| 14. |
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 | |
| 15. |
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 | |
| 16. |
TLV of aldrin in public water supply system is about __________ μg/litre. |
| A. | 0.5 |
| B. | 17 |
| C. | 357 |
| D. | 1097 |
| Answer» C. 357 | |
| 17. |
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent. |
| A. | 84 |
| B. | 88 |
| C. | 80 |
| D. | 92 |
| Answer» B. 88 | |
| 18. |
Higher concentration of nitrogen dioxide in atmospheric air causes |
| A. | Cancer |
| B. | Bronchitis |
| C. | Asphyxiation |
| D. | Corrosion |
| Answer» C. Asphyxiation | |
| 19. |
Presence of excess flourine in water causes |
| A. | Dental cavity |
| B. | Tooth decay |
| C. | Fluorosis |
| D. | Respiratory disease |
| Answer» D. Respiratory disease | |
| 20. |
Which of the following is not an air pollutant? |
| A. | Ozone |
| B. | Carcinogens |
| C. | Pesticides |
| D. | Metallic powders |
| Answer» B. Carcinogens | |
| 21. |
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 | |
| 22. |
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 | |
| 23. |
TLV of mercury in potable (drinking) water is about __________ ppm. |
| A. | 0.001 |
| B. | 0.1 |
| C. | 1 |
| D. | 5 |
| Answer» B. 0.1 | |
| 24. |
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 | |
| 25. |
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. | |
| 26. |
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 | |
| 27. |
Noise level in a quiet private business office is about __________ decibels. |
| A. | 25 |
| B. | 50 |
| C. | 70 |
| D. | 85 |
| Answer» C. 70 | |
| 28. |
Noise level inside a jet air liner in normal flight is about __________ decibels. |
| A. | 80 |
| B. | 100 |
| C. | 125 |
| D. | 145 |
| Answer» C. 125 | |
| 29. |
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 | |
| 30. |
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by |
| A. | Chemical coagulation |
| B. | Floatation & skimming |
| C. | Centrifugation |
| D. | Ultrafiltration |
| Answer» B. Floatation & skimming | |
| 31. |
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 | |
| 32. |
Which of the following acts as a natural source of air pollution? |
| A. | Forest fire |
| B. | Deforestation |
| C. | Volcanic eruption |
| D. | None of these |
| Answer» D. None of these | |
| 33. |
Industrial workers working in leather tanning & manufacturing units are prone to suffer from |
| A. | Respirtory ailments (e.g. bronchitis) |
| B. | Skin diseases (e.g. dermatities) |
| C. | Silicosis |
| D. | Blurred vision |
| Answer» C. Silicosis | |
| 34. |
The pH value of oxidised sewage is about |
| A. | 1.8 |
| B. | 6.2 |
| C. | 7.3 |
| D. | 13.4 |
| Answer» D. 13.4 | |
| 35. |
Presence of nitrates in water in excess of 50 ppm causes |
| A. | Mathenoglobenemia |
| B. | Gastroentetitis |
| C. | Asphyxiation |
| D. | Tooth decay |
| Answer» B. Gastroentetitis | |
| 36. |
Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by |
| A. | Quenching of hot coke |
| B. | Discharging in the river stream |
| C. | Filtration and recycling for cooling coke oven gas |
| D. | None of these |
| Answer» B. Discharging in the river stream | |
| 37. |
Maximum permissible turbidity in potable water is __________ ppm. |
| A. | 1 |
| B. | 10 |
| C. | 250 |
| D. | 1000 |
| Answer» C. 250 | |
| 38. |
Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect? |
| A. | CO₂ |
| B. | H₂ |
| C. | SO₃ |
| D. | N₂ |
| Answer» D. N₂ | |
| 39. |
__________ can not control the noise pollution. |
| A. | Use of silencers |
| B. | Green house gases |
| C. | Vibration damping |
| D. | Tree plantation |
| Answer» C. Vibration damping | |
| 40. |
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 | |
| 41. |
Workers working in __________ industry are most prone to white lung cancer. |
| A. | Coal mining |
| B. | Limestone mining |
| C. | Textile |
| D. | Asbestos |
| Answer» D. Asbestos | |
| 42. |
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 of the above |
| Answer» E. | |
| 43. |
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. | |
| 44. |
Smoke is produced due to |
| A. | Insufficient supply of combustion air and insufficient time for combustion |
| B. | Poor quality of fuel and improper mixing of fuel & combustion air |
| C. | Poor design & overloading of furnace |
| D. | All of the above |
| Answer» E. | |
| 45. |
Smog is |
| A. | Nothing but black smoke |
| B. | A combination of smoke and fog |
| C. | A liquid particle resulting from vapor condensation |
| D. | A solid particle e.g. flyash |
| Answer» C. A liquid particle resulting from vapor condensation | |
| 46. |
Carbonaceous particles having size less than 1 μm are called |
| A. | Grit |
| B. | Aggregates |
| C. | Aerosols |
| D. | Smoke |
| Answer» E. | |
| 47. |
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 | |
| 48. |
Fresh domestic sewage is __________ in color. |
| A. | Grey |
| B. | Dark brown |
| C. | Red |
| D. | Black |
| Answer» B. Dark brown | |
| 49. |
Soluble silica present in boiler feed water can be removed by |
| A. | Coagulation |
| B. | Filtration |
| C. | Anion exchanger |
| D. | Preheating it |
| Answer» D. Preheating it | |
| 50. |
Brown spots in fabrics will be caused by washing with water containing large amount of . |
| A. | Iron |
| B. | Zinc |
| C. | Iodine |
| D. | Bromine |
| Answer» B. Zinc | |