Environmental Engineering MCQs with answers Page - 4

Here, you will find a collection of MCQ questions on Environmental Engineering. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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Q. Carcinogenic air pollutants cause

  • (A) Bone decay
  • (B) Cancer
  • (C) Asphyxiation (suffocation)
  • (D) Anemia

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Q. 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.

  • (A) 102
  • (B) 105
  • (C) 109
  • (D) 1015

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Q. Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

  • (A) By chemical coagulation
  • (B) In sedimentation tanks equipped with mechanical scrapper
  • (C) In vacuum filter
  • (D) In clarifiers

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Q. COD of raw municipal sewage may be in the range of about _________ mg/litre.

  • (A) 43862
  • (B) 44109
  • (C) 90-120
  • (D) 1500-2500

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Q. Color test of water is done with an instrument called

  • (A) Tintometer
  • (B) Colorimeter
  • (C) Electro-chemical cell
  • (D) Turbidimeter

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Q. Corrosion in boilers can be prevented by

  • (A) Deaeration of feed water
  • (B) Enhancing pH of feed water by adding alkali
  • (C) Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
  • (D) All (A), (B) and (C)

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Q. Deaeration of high pressure boiler feed water is done to reduce

  • (A) Foaming from boilers
  • (B) Its dissolved oxygen content
  • (C) Its silica content
  • (D) Caustic embrittlement

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Q. Death may occur, when SO2 concentration in atmospheric air exceeds _________ ppm.

  • (A) 20
  • (B) 100
  • (C) 400
  • (D) 200

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Q. Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as

  • (A) Photochemical smog
  • (B) Peroxyacetyl nitrate (PAN) or methyl nitrite
  • (C) Benzopyrene
  • (D) Polyacrylonitrile

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Q. 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)

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