Environmental Engineering MCQs with answers Page - 3

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. Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for

  • (A) Conversion of CO into CO2 in the second compartment
  • (B) Conversion of NOx into N2 and NH3 in the first compartment
  • (C) Oxidation of unburnt hydrocarbon fuel in the second compartment
  • (D) All (A), (B) and (C)

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Q. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

  • (A) Coagulation and flocculation of colloids
  • (B) Oxidation of carbonaceous matter to CO2
  • (C) Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter to the nitrite and eventually to the nitrate
  • (D) All (A), (B) and (C)

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Q. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is

  • (A) Inversely proportional to viscosity of gas
  • (B) Proportional to the viscosity & density of the gas
  • (C) Proportional to the pressure of the gas
  • (D) Both (B) and (C)

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Q. Beyond what concentration of H2S in air, acute danger to human life exists?

  • (A) 50 ppm
  • (B) 100 ppm
  • (C) 300 ppm
  • (D) 700 ppm

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Q. Biological oxidation ponds remove organic matters present in the polluted water by

  • (A) Using the activities of bacteria and other micro organisms
  • (B) Aerobic oxidation
  • (C) Both (A) & (B)
  • (D) Neither (A) nor (B)

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Q. Black smoke coming out of the chimney of a furnace is an indication of the use of _________ in the furnace.

  • (A) Low amount of excess combustion air
  • (B) Large quantity of excess combustion air
  • (C) Hydrocarbon fuel
  • (D) Pulverised coal as fuel

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

  • (A) 43862
  • (B) 44109
  • (C) 150-300
  • (D) 2000-3000

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Q. Brown spots in fabrics will be caused by washing with water containing large amount of

  • (A) Iron
  • (B) Zinc
  • (C) Iodine
  • (D) Bromine

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Q. Carbon monoxide is a pollutant, which causes

  • (A) Respiratory disease (e.g. asthma)
  • (B) Asphyxiation (suffocation) leading to death
  • (C) Retardation in crop growth
  • (D) Damage to building materials like marble

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Q. Carbonaceous particles having size less than 1 μm are called

  • (A) Grit
  • (B) Aggregates
  • (C) Aerosols
  • (D) Smoke

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