In which case does the thermal conductivity increase from left to right

In which case the thermal conductivity increases from left to right.

In which one of the following cases does the thermal conductivity increase from left to right?

Thermal conduction

On which fcator does the thermal conductivity depend ?

On what facters does the thermal conductivity of a metal depend ?

In which of the following cases, the centre of mass of rod may be its centre ? (1) The linear mass density increases continuously from left to right. (2) The linear mass density decreases continuouly from let to right. (3) The linear mass density decreases from left to right up to centre and then increases. (4) The linear mass density increases form left to right upto a certain point (may not be the centre) and the decreases from the point till the end.