Which composite material is widely used1 pointPolymer compositesMetal compositesCeramic compositesCarbon composites

All of the options listed - Polymer composites, Metal composites, Ceramic composites, and Carbon composites - are widely used composite materials. The usage depends on the specific application and requirements.

1. Polymer composites: These are widely used in automotive, aerospace, and construction industries due to their high strength-to-weight ratio and corrosion resistance.

2. Metal composites: These are used in applications where high strength and durability are required, such as in the automotive and aerospace industries.

3. Ceramic composites: These are used in high-temperature applications, such as in the aerospace and nuclear industries.

4. Carbon composites: These are used in high-performance applications, such as in the aerospace industry, due to their high strength and light weight.

So, the answer to your question depends on the context or specific application you are referring to.