AIIMS 2019 Physics Thermal Resistance Assertion Reason Question
Assertion: The thermal resistance of a multiple layers laminas is equal to the sum of the thermal resistance of the individual lamina. Reason: Heat transferred is directly proportional to the temperature gradient in each layer.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because the total thermal resistance (R_total) of multiple layers of laminas is indeed the sum of the individual thermal resistances (R₁ + R₂ + ... + R_n). However, the reason is false; while heat transfer is proportional to the temperature gradient, this relationship applies to each layer individually and does not directly explain why the total thermal resistance is a simple sum. Option A is incorrect because the reason does not correctly explain the assertion, while option B is incorrect as it implies a correct explanation. Option D is incorrect since the assertion is valid.
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