Question

Materials which do not conduct heat are called
A. Insulators
B. Transistors
C. Bolt
D. Mediators

Answer 1

Hint: Thermal conductivity of a material shows how much amount of heat the material can conduct from within the body of the material. The higher the amount of conductivity, the more would be the material able to conduct heat and with less conductivity, the flow of heat in the body will be less.

Complete answer:
Thermal conductivity of a substance is the ability of that substance to conduct heat through the substance. The measure of the “goodness” or the”badness” of a substance for the heat flow through conduction is provided by the thermal conductivity of a substance. Materials that allow heat to pass through them easily are known as good conductors of heat. Materials that do not conduct heat as easily and quickly as metals do are known as bad conductors.

An insulator is a material that does not allow a transfer of electricity or heat energy.Materials that are poor thermal conductors can also be described as being good thermal insulators.Feather, fur, and natural fibers are all examples of natural insulators. These are materials that allow birds, mammals and human beings to stay warm. Thus, the materials which do not conduct heat are called insulators.

Hence option A is the correct answer.

Note: Well-insulated buildings need less energy for heating than buildings that have no insulation. Wood, lead, and non metal are not good conductors of heat. Poor conductors are any material that does not conduct electricity, heat or both very well and are generally known as insulators. Air is also an example of an insulator.