Question

which of these materials is best as a thermal conductor? wood copper plastic ceramics

Explanation:

Copper is a metal. Metals generally have free electrons that can easily transfer thermal energy, making them good thermal conductors. Wood is an insulator as it has a cellular structure that traps air (air is a poor thermal conductor). Plastic is also an insulator as it is a polymer with no free electrons for easy heat transfer. Ceramics are often insulators (though some advanced ceramics can have moderate thermal conductivity but not as good as copper in general cases).

Answer:

copper