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UPSC Prelims 2022 Paper-1 📅 05 Jun, 2022

With reference to polyethylene terephthalate, the use of which is so widespread in our daily lives, consider the following statements:
1. Its fibres can be blended with wool and cotton fibres to reinforce their properties.
2. Containers made of it can be used to store any alcoholic beverage.
3. Bottles made of it can be recycled into other products.
4. Articles made of it can be easily disposed of by incineration without causing greenhouse gas emissions.

Which of the statements given above are correct?

A
(a) 1 and 3
B
(b) 2 and 4
C
(c) 1 and 4
D
(d) 2 and 3
Result Summary
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UPSC Prelims
2022 • 05 Jun, 2022 • Paper-1
With reference to polyethylene terephthalate, the use of which is so widespread in our daily lives, consider the following statements:
1. Its fibres can be blended with wool and cotton fibres to reinforce their properties.
2. Containers made of it can be used to store any alcoholic beverage.
3. Bottles made of it can be recycled into other products.
4. Articles made of it can be easily disposed of by incineration without causing greenhouse gas emissions.

Which of the statements given above are correct?
Correct Answer
(a) 1 and 3
Material Properties: Statement 1 is correct. PET, when processed into the textile industry, is commonly referred to as polyester. It is frequently blended with ......
Ref/Book : UPSC Prelims 2022
Ref. Subject Science & Technology
Chapter -
Ref. Topic Chemistry / Materials
Pg. No -
💡 Analysis & Explanation
Material Properties ▼
Statement 1 is correct. PET, when processed into the textile industry, is commonly referred to as polyester. It is frequently blended with natural fibers like cotton or wool to massively increase durability, reduce wrinkling, and enhance tear resistance.
Chemical Interactions ▼
Statement 2 is incorrect. While PET is widely used for water and soft drinks, it is not suitable for storing *any* alcoholic beverage long-term (especially concentrated spirits) because high levels of alcohol can degrade the plastic and cause leaching over time.
Environmental Impact ▼
Statement 3 is correct. PET is highly recyclable (often labeled as #1 plastic) and can be reprocessed into lower-grade fibers, carpets, and new packaging. Statement 4 is completely incorrect. Incineration of any carbon-based synthetic plastic inherently releases carbon dioxide and other greenhouse gases into the atmosphere.
Conclusion ▼
Statements 1 and 3 represent accurate material science facts.
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