AIIMS 2000 Physics Heat and Electrical Conduction Assertion Reason Question

The assertion states that good conductors of heat are also good conductors of electricity and vice versa. This is true because both thermal and electrical conductivity in materials are largely due to the presence of free electrons that can move easily through the material. For instance, metals like copper and aluminum are excellent conductors of both heat and electricity due to their high density of free electrons. The reason provided supports the assertion by explaining that electrons are primarily responsible for these conduction processes. Therefore, both the assertion and reason are true, and the reason correctly explains the assertion.

Option B is incorrect because while both statements are true, the reason does indeed explain the assertion. Option C is incorrect as both statements are true. Option D is also incorrect as both are true. Thus, the correct answer is A.