Answer the question in brief.. lesson is heat

Dear Student,

2- 
Conductor:- The objects which allow the electricity to pass through them are called conductors.
Example:- Iron, copper, graphite etc.

Insulators:-The objects which do not allow the electricity to pass through them are called insulators.
Example:- plastic, wood, rubber etc.

3- Mercury is the liquid which is good conductor of heat.

Regards