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$(1)$What type of bonding causes a polymer to become chemically set? A Cross$-$linking B Addition CPolymerization D$)$ Branching

$(2)$What is the primary material used in thermoplastic polymers? A Polyethylene B$)$ Polystyrene C$)$ Polypropylene D Polyvinylchloride

$(3)$Which category of ceramics is used in high$-$temperature environments? A Glasses B$)$ Traditional Ceramics C$)$ Ceramic Matrix Composites D Oxide Ceramics

$(4)$What is the primary reinforcing material in fiber$-$reinforced polymer $($FRP$)$ composites? A$)$ Boron Nitride B$)$ Kevlar C Fiberglass D$)$ Carbon Fiber