NEET 2013 Physics Conduction MCQ Question
Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K₁ and K₂, and cross sectional areas A₁ and A₂, respectively. If the rate of the heat conduction in 1 is four times that in 2, then:
K₁A₁ = 4K₂A₂
K₁A₁ = 2K₂A₂
4K₁A₁ = K₂A₂
K₁A₁ = K₂A₂
Correct Answer
Detailed Explanation
The rate of heat conduction is given by Q/t = KA(ΔT)/L. Since the lengths and temperature differences are the same, the ratio of conductivities and areas must satisfy K₁A₁ = 4K₂A₂.
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