CO
SO₂
NO₂
CO₂
✅ The correct answer is option B.
Chemical Engineering MCQs
Which of the following acts as a natural source of air pollution?
Forest fire
Deforestation
Volcanic eruption
None of these
✅ The correct answer is option C.
‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a ‘particulate’?
Dust & mists
Smoke & fumes
Photochemical smog & soot
None of these
✅ The correct answer is option D.
Polluted water having low BOD are most economically treated in
Sedimentation tanks
Oxidation ponds
Sludge digester
Clarifier
✅ The correct answer is option B.
Main pollutants released from petroleum refineries is
CO, SO₂ & H₂S
CO₂, NO & SO₃
CO₂, H₂S & NO₂
SO₃, NO₂ & CO₂
✅ The correct answer is option A.
Fresh sewage is __________ in nature.
Acidic
Neutral
Alkaline
Highly acidic
✅ The correct answer is option C.
Inorganic impurities causing water pollution is
Fats
Carbohydrates
Salts of metals
Protein
✅ The correct answer is option C.
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
Biological oxygen pond
Aerated lagoons
Trickling filters
Gravity separator having oil skimming devices
✅ The correct answer is option D.
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.
0.1
25
100
1000
✅ The correct answer is option A.
Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?
Packed scrubber
Gravity settling chamber
Electrostatic precipitator
Hydrocyclone
✅ The correct answer is option C.