Which one of the following polymers is used in making bullet-proof vests?

The correct answer is (b). Polyamides are used in making bullet-proof vests. They are strong and flexible, and they can absorb the impact of a bullet without allowing it to penetrate the vest.

Bakelite is a thermosetting plastic that is not used in making bullet-proof vests. It is a hard and brittle material that would not be able to absorb the impact of a bullet.

Teflon is a fluoropolymer that is not used in making bullet-proof vests. It is a slippery material that would not be able to stop a bullet.

Polyurethanes are a type of plastic that is not used in making bullet-proof vests. They are not strong enough to stop a bullet.

Here is a more detailed explanation of each option:

• Bakelite is a thermosetting plastic that is made from a reaction between phenol and formaldehyde. It is a hard and brittle material that is used in a variety of applications, including electrical insulation, cookware, and furniture. Bakelite is not used in making bullet-proof vests because it is not strong enough to stop a bullet.
• Teflon is a fluoropolymer that is made from a reaction between tetrafluoroethylene and hexafluoropropylene. It is a slippery material that is used in a variety of applications, including nonstick cookware, gaskets, and electrical insulation. Teflon is not used in making bullet-proof vests because it is not strong enough to stop a bullet.
• Polyurethanes are a type of plastic that is made from a reaction between polyols and isocyanates. They are a versatile material that is used in a variety of applications, including foams, elastomers, and coatings. Polyurethanes are not used in making bullet-proof vests because they are not strong enough to stop a bullet.

Polyamides are a type of plastic that is made from a reaction between diamines and dicarboxylic acids. They are strong and flexible materials that are used in a variety of applications, including ropes, fabrics, and composites. Polyamides are used in making bullet-proof vests because they can absorb the impact of a bullet without allowing it to penetrate the vest.