| 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).
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| 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
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| 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
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| 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.
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| 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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