Engineering Materials Quiz: Polymers, Composites & Smart Materials

The correct answer is C because glass is widely used in automobile windshields due to its transparency, strength, and safety properties. Laminated safety glass prevents shattering into sharp pieces. Other materials lack the required optical clarity and structural strength.

The correct answer is A because PMMA, also known as acrylic, is used in contact lenses due to its optical clarity and lightweight nature. Other materials do not provide the required transparency and biocompatibility.

The correct answer is A because phenol formaldehyde undergoes degradation under UV exposure, leading to discoloration. This property limits its outdoor applications. Other polymers have better UV resistance.

The correct answer is B because ABS is formed by polymerizing acrylonitrile, butadiene, and styrene. This combination provides strength and impact resistance. Other options are different polymers.

The correct answer is B because thermosetting plastics form cross-linked structures during curing, making them rigid and heat-resistant. Thermoplastics do not have this structure.

The correct answer is B because photochromic materials change color when exposed to UV light, making them ideal for sunglasses. Electrochromic materials require electrical input.

The correct answer is C because nylon is not suitable for refrigerator gaskets due to its poor sealing properties. It is commonly used in clothing, gears, and ropes.

The correct answer is A because thermoplastics soften on heating and can degrade if overheated. Thermosetting plastics are more heat-resistant.

The correct answer is A because nylon is a thermoplastic, not thermosetting. Thermosetting plastics cannot be reshaped once cured.

The correct answer is C because neoprene is durable and resistant to wear, making it suitable for conveyor belts.

The correct answer is C because acrylic is sensitive to solvents like acetone and petrol, which can damage it.

The correct answer is B because nylon is formed through condensation polymerization of hexamethylene diamine and adipic acid.

The correct answer is C because refractories are designed to withstand extremely high temperatures.

The correct answer is D because quartz generates electrical charge under mechanical stress, showing piezoelectric behavior.

The correct answer is B because glass wool provides excellent thermal insulation in both hot and cold conditions.