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Question 30835
JEE Physics · Hard

Elasticity, Thermal Expansion, Calorimetry and Heat Transfer: Superficial Expansion MCQ

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Superficial ExpansionHardQuestion 30835

Question

Area of a square metal plate at 0°C is 100 cm². At 100°C area is (α = 1.2×10⁻⁵ /°C):
  1. A
    100.12 cm²
  2. B
    100.24 cm²
    Correct
  3. C
    100.036 cm²
  4. D
    101.2 cm²

Correct answer

100.24 cm²

Explanation

ΔA = A₀βΔT = 100 × 2α × 100 = 100 × 2.4×10⁻³ = 0.24 cm². Final area = 100.24 cm².

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