UPSC CSE Prelims
Ozone Layer Depletion Previous Year Questions (PYQs)
Practice solved questions for Ozone Layer Depletion with detailed step-by-step solutions, key insights, and trend analysis for UPSC CSE PRELIMS.
Solved Previous Year Questions
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Consider the following statements: Chlorofluorocarbons, known as ozone-depleting substances, are used
- in the production of plastic foams
- in the production of tubeless tyres
- in cleaning certain electronic components
- as pressurizing agents in aerosol cans
Which of the statements given above is/are correct?
Detailed Explanation:
✅ Statement 1 – Correct: CFCs were widely used as blowing agents in the production of plastic foams (polystyrene, polyurethane) for insulation and packaging.
❌ Statement 2 – Incorrect: Tubeless tyres are manufactured through vulcanization using sulfur; CFCs have no role in tyre production.
✅ Statement 3 – Correct: CFC-113 was extensively used as a solvent for cleaning electronic components and circuit boards due to its non-flammable, residue-free properties.
✅ Statement 4 – Correct: CFCs served as propellants/pressurizing agents in aerosol cans (hairsprays, deodorants) before being phased out under the Montreal Protocol.
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