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MCQ

Question

A brass cube of side 15cm at 35∘C is heated to 135∘C. What is the increase in its surface area if one face is 225cm2? (αl\=1.8×10−5K−1)

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Explanation

Given: A0 = 225cm2 (one face), total surface area = 6×225 = 1350cm2, ΔT = 135−35 = 100∘C, αl = 1.8×10−5K−1. Area expansion: ΔA = A0×2αlΔT. For total surface area: ΔA = 1350×2×1.8×10−5×100 = 1350×3.6×10−3 = 4.86cm2.

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