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UPSC Prelims 2020 Paper-1 📅 04 Oct, 2020

Which of the following are the reasons/factors for exposure to benzene pollution?
1. Automobile exhaust
2. Tobacco smoke
3. Wood burning
4. Using varnished wooden furniture
5. Using products made of polyurethane
Select the correct answer using the code given below:

A
1, 2 and 3 only
B
2 and 4 only
C
1, 3 and 4 only
D
1, 2, 3, 4 and 5
Result Summary
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UPSC Prelims
2020 • 04 Oct, 2020 • Paper-1
Which of the following are the reasons/factors for exposure to benzene pollution?
1. Automobile exhaust
2. Tobacco smoke
3. Wood burning
4. Using varnished wooden furniture
5. Using products made of polyurethane
Select the correct answer using the code given below:
Correct Answer
1, 2 and 3 only
Combustion Dynamics: Benzene is naturally occurring in crude oil and is a prominent, highly toxic by-product of incomplete combustion of carbon-rich materials.P......
Ref/Book : UPSC Prelims 2020
Ref. Subject Environment
Chapter -
Ref. Topic Pollution
Pg. No -
💡 Analysis & Explanation
Combustion Dynamics ▼
Benzene is naturally occurring in crude oil and is a prominent, highly toxic by-product of incomplete combustion of carbon-rich materials.
Primary Emission Sources ▼
Consequently, automobile tailpipe exhaust (burning gasoline), the burning of wood (forest fires or residential heating), and the inhalation of active or secondhand tobacco smoke represent the most significant, well-documented primary sources of human exposure to airborne benzene. This validates options 1, 2, and 3.
Secondary Material Off-gassing ▼
While varnished wooden furniture and polyurethane products can release various volatile organic compounds (VOCs) like formaldehyde or toluene through off-gassing, they are not standard, prominent sources of benzene emissions in modern household environments compared to combustion activities.
Conclusion ▼
Thus, automobile exhaust, tobacco smoke, and wood burning are the correct primary exposure routes.
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