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Physics-Heat Transfer

NEET Physics Heat Transfer MCQ Question

Type: MCQ-numerical-Hard-Class 11

A metal rod with a thermal conductivity of 91.6 W/m·K and a cross-sectional area of 0.02 m² is used to transfer heat from a hot reservoir at 373 K to a cold reservoir at 273 K. If the length of the rod is 0.1 m, what is the rate of heat transfer through the rod?

A

1832 W

B

916 W

C

458 W

D

229 W

Correct Answer

Option B

Detailed Explanation

Using the formula for conduction, Q/t=k⋅A⋅(T2−T1)dQ/t = \frac{k \cdot A \cdot (T_2 - T_1)}{d}, where k=91.6 W/m\cdotpK,A=0.02 m2,T2−T1=373 K−273 K,d=0.1 mk = 91.6 \text{ W/m·K}, A = 0.02 \text{ m}^2, T_2 - T_1 = 373 \text{ K} - 273 \text{ K}, d = 0.1 \text{ m}. The rate of heat transfer is 916 W.

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