1.
Match the following:
| P. Polyaramid | 1. Baby-feeding nipple |
| Q. Polytetrafluoroethylene | 2. Optical glasses |
| R. Polycarbonate | 3. Non-stick cookware |
| S. Poly(dimethyl siloxane) | 4. Bullet-proof jacket |
Exam Year(s)
GATE XE - 2018,
Answer: A
The match is P-4; Q-3; R-2; S-1.
- Polyaramid fibres (such as Kevlar) are very strong for their weight and are used in bullet-proof jackets.
- PTFE has a very low surface energy and coefficient of friction and withstands cooking temperatures: non-stick cookware.
- Polycarbonate is transparent and impact-resistant, used for optical glasses and lenses.
- Poly(dimethyl siloxane), silicone rubber, is soft, flexible, inert and heat-sterilisable: baby-feeding nipples.
Each other option swaps at least two of these well-established uses, for example putting PTFE on nipples or polyaramid on optical glasses.
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