chemical engineering chemical environmental engineering chemical engineering MCQs – Page 3

Practise multiple-choice questions from chemical engineering chemical environmental engineering chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical environmental engineering chemical engineering Mcqs
41. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?
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A. Lagoon

B. Skimming mill

C. Cesspool

D. Septic tank
42. Which of the following is the most widely used disinfectant in water treatment ?
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A. Chlorine

B. Coagulation

C. Cation exchanger

D. Irradiation of water by ultraviolet light

43. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?
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A. Acts as a green house gas thereby raising earths temperature

B. Enhances the green house effect

C. Causes increase in sea level

D. Causes asphyxia
44. Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?
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A. Chemical coagulation

B. Mechanical flocculation

C. Sedimentation tank

D. Circular clarifier

45. Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of ______________ toxic gas?
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A. Extremely

B. Moderately

C. Very extremely

D. Highly

46. The function of skimming tank in sewage treatment is to remove _____________ substances?
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A. Gritty & inorganic

B. Suspended solid

C. Dissolved solid

D. Oil & fatty
47. Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?
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A. Electrostatic precipitator

B. Hydrocyclone

C. Packed scrubber

D. Gravity settling chamber

48. The biological decomposition of organic substances in wastes controlled conditions is called_________________?
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A. Composting

B. Incineration

C. Biological oxidation

D. None of these

49. Exposure to SO2 containing chimney gases results in the__________________?
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A. All A., B. and C.

B. Reduction in strength of leather & cloth

C. Acceleration of corrosion rates of metals

D. Increased drying & hardening time of paints

50. Presence of _____________ bacteria in water causes disease like typhoid?
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A. Anaerobic

B. Aerobic

C. Pathogenic

D. Non-pathogenic

51. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?
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A. Mercury

B. Aluminium

C. Lead

D. Arsenic

52. Arsenic pollutant is not generated in _______________ industries?
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A. Tanneries

B. Glass & ceramic

C. Any of these

D. Beverages
53. Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?
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A. Machining

B. Grinding

C. Polishing

D. Cutting

54. Threshold limit value (TLV) of CO in air is _____________ ppm?
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A. 50

B. 5000

C. 2000

D. 5

55. Main pollutants released from iron & steel industry is__________________?
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A. SO3, NO2 & CO2

B. CO2, H2S & NO2

C. CO, CO2 & SO2

D. H2S, NO & SO3

56. . Operating principle of cyclone separator is based on the action of _______________ dust particles?
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A. Diffusion of

B. Electrostatic force on

C. Gravitational force on

D. Centrifugal force on
57. Main pollutants released from petroleum refineries is__________________?
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A. CO2, H2S & NO2

B. CO, SO2 & H2S

C. SO3, NO2 & CO2

D. CO2, NO & SO3

58. Siderosis is a disease caused by the inhalation of ______________ dust?
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A. Iron

B. Silica

C. Coal

D. None of these

59. Carcinogenic air pollutants cause__________________?
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A. Cancer

B. Bone decay

C. Asphyxiation (suffocation)

D. Anemia

60. Pick out the correct statement ?
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A. hromate in cone, sulphuric acid solution at boiling temperature for specified time

B. Chemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present

C. tes. Typically COD of potable water may be 1-2 mg/litre

D. COD is determined by oxidising the organic matter present in water with potassium

E. COD is related to BOD of a given waste in water but the relationship varies for different

F. water