E-PolyLearning

1. Smoke is produced due to
a. insufficient supply of combustion air and insufficient time for combustion.
b. poor quality of fuel and improper mixing of fuel & combustion air.
c. poor design & overloading of furnace.
d. all (a), (b) and (c).
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Answer: (d).all (a), (b) and (c).

2. Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
a. hydrocarbons
b. hydrogen flouride
c. hydrogen sulphides
d. nitrogen dioxide
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Answer: (b).hydrogen flouride

3. Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.
a. 5
b. 500
c. 1000
d. 2000
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Answer: (a).5

4. Main pollutants released from iron & steel industry is
a. CO, CO₂ & SO₂.
b. H₂S, NO & SO₃.
c. CO₂, H₂S & NO₂.
d. SO₃, NO₂ & CO₂.
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Answer: (a).CO, CO₂ & SO₂.

5. Exposure to chemicals having carcinogenic properties cause
a. dermatitis (skin disorder)
b. cancer
c. asphyxiation (suffocation)
d. asthma
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Answer: (b).cancer

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