Question

The thermal conductivity of a rod depends on

• A. Length
• B. Mass
• C. Area of cross section
• D. Material of the rod

Answer 1

The correct option is D

Material of the rod

$\frac{\Delta Q}{\Delta t}=-kA\frac{dT}{dx}$

Here, the thermal conductivity ($k$) depends on the material, and not the dimensions and mass of the body.