Environmental Engineering

241.Which of the following acts as a natural source of air pollution?

1. Forest fire
2. Deforestation
3. Volcanic eruption
4. None of these

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242.Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?

1. Smog&ozone
2. Hydrogen fluoride&nitrogen oxides
3. Sulphur dioxide&spray of weed killers
4. Carbon monoxide

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243.Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?

1. Benzopyrene
2. Peroxyacetyl nitrate
3. Carbon monoxide
4. Sulphur dioxide

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244.Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?

1. Dust catcher (gravity type)
2. Cyclone separator
3. Bag filter
4. Hollow wet scrubber

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245.Which of the following fine dust removal equipments is the most efficient?

1. Bag filter
2. Scrubber
3. Electrostatic precipitator
4. Cyclone separator

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246.Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gasair mixture), rendering it the property of the most explosive gas?

1. Hydrogen
2. Acetylene
3. Carbon monoxide
4. Ammonia

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247.Which of the following industries discharge mercury as a pollutant?

1. Chloro-alkali industry
2. Tanneries
3. Beverage plant
4. Phosphoric acid plant

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248.Which of the following is a green house gas other than CO₂?

1. Methane
2. Nitrous oxide
3. Chlorofluoro carbons (CFC)
4. All (A), (B) and (C)

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249.Which of the following is a manmade source of air pollution?

1. Automobile exhaust
2. Forest fire
3. Bacterial action in soil and swamp areas
4. All (A), (B) and (C)

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250.Which of the following is an adsorbent for removal of nitrogen oxides from gas/air?

1. Active carbon
2. Silica gel
3. Bog iron (iron oxide)
4. Pulverised limestone

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