chemical engineering chemical environmental engineering chemical engineering MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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
21. Peroxyacetyl nitrate (PAN), a pollutant is found in the_________________?
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A. Flue gas of coal based power plant

B. Exhaust of nitric acid plant

C. Exhaust of sulphuric acid plant

D. Automobile exhaust
22. _____________ plant emits large amount of SO2 as an air pollutant?
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A. Chlor alkali

B. Sulphuric acid

C. Iron & steel

D. Nitric acid

23. Out of the following, TLV of _______________ is maximum (about 500 ppm)?
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A. Toluene

B. Acetaldehyde

C. Carbon disulphide

D. Carbon dioxide
24. Radioactive solid nuclear wastes are disposed off by _________________?
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A. Pathological incineration

B. High temperature incineration

C. Underground burial in concrete containers

D. Pyrolysis

25. Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?
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A. Pulverised coal as fuel

B. Large quantity of excess combustion air

C. Low amount of excess combustion air

D. Hydrocarbon fuel

26. Which of the following is not a natural source of air pollution ?
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A. Biological decay of vegetable matter

B. Volcanic eruptions and lightening discharges

C. Photochemical oxidation of organic matter

D. None of these
27. Beyond what concentration of H2S in air, acute danger to human life exists ?
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A. 100 ppm

B. 700 ppm

C. 300 ppm

D. 50 ppm

28. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?
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A. Chlorine

B. Alkyl benzene sulphonate (ABS)

C. Alkalis

D. Benzene hexachloride

29. The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?
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A. CH4

B. H2

C. CO

D. CO2

30. Which of the following industries discharge mercury as a pollutant ?
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A. Beverage plant

B. Tanneries

C. Phosphoric acid plant

D. Chloro-alkali industry
31. A shallow pond in which the sewage is retained and biologically treated is called__________________?
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A. Oxidation

B. Lagoon

C. Skimming tank

D. Imhoff tank

32. Which of the following fine dust removal equipments is the most efficient ?
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A. Electrostatic precipitator

B. Scrubber

C. Bag filter

D. Cyclone separator

33. The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
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A. Bacterial stability factor

B. Oxygen ion concentration

C. Biological oxygen demand (BOD)

D. Relative stability
34. 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 ozone?
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A. 105

B. 1015

C. 102

D. 109

35. Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for___________________?
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A. Oxidation of unburnt hydrocarbon fuel in the second compartment

B. Conversion of CO into CO2 in the second compartment

C. Conversion of NOx into N2 and NH3 in the first compartment

D. All A., B. and C.
36. A man exposed to excessive noise level in the working environment may suffer from____________________?
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A. Nervousness & fatigue

B. Hearing loss

C. Rupture of ear drum

D. All A., B. & C.
37. 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?
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A. 100-200

B. 100-1000

C. < 1

D. 10-100

38. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels?
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A. 120

B. 20

C. 90

D. 60

39. Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes_______________?
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A. Odour nuisances

B. Undesirable plant growth

C. Turbidity

D. Foaming

40. Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is _____________ decibels?
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A. 35

B. 105

C. 95

D. 75