Answer:
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Types of conductivity: 1 Mark
Conductivities: 2 Marks each
There are two types of conductivities - heat and electricity.
Based on conduction of heat, materials can be classified into either good or bad conductors.
Materials that allow heat to pass through them are called good conductors of heat.
Example: Metals are usually good conductors of heat.
Materials that do not allow heat to pass through them are called bad conductors of heat.
Example: Plastic, air.
Based on conduction of electricity, materials can be classified into either good or bad conductors.
Materials that let electricity pass through them are called good conductors of electricity.
Example: Metals are generally good conductors of electricity.
Materials that do not let electricity pass through them are called insulators or bad conductors of electricity.
Example: Plastic, Wood,air.