STATEMENT-1: The thermal conductivity of...

STATEMENT-1: The thermal conductivity of a rectangular slab of a material can be defined only under steady-state conditions, i.e, when the temperatures of the end faces do not changes with time.
STATEMENT-2: The rate of conduction of heat through a reactangular slab is proportional to the difference in temperature between its end faces.

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation, for Statement-1.

Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for Statement-1.

Statement-1 is True, Statement-2 is False.

Statement-1 is a False, Statement-2 is True.

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