Assertion : While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer kept cold.
Reason : This avoids heating of liquid by convection.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If the assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

A

Explanation

We know that to measure thermal conductivity of liquids experimentally they must be heated from the top i.e. Upper layer is kipt hot cold, so as to prevent convection in liquids.