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Question 30829
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Elasticity, Thermal Expansion, Calorimetry and Heat Transfer: Linear Expansion MCQ

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Linear ExpansionMediumQuestion 30829

Question

A metal bar at 20°C has length 1.000 m. At 120°C length is 1.002 m. Coefficient of linear expansion is:
  1. A
    1×10⁻⁵ /°C
  2. B
    2×10⁻⁵ /°C
    Correct
  3. C
    5×10⁻⁵ /°C
  4. D
    2×10⁻⁴ /°C

Correct answer

2×10⁻⁵ /°C

Explanation

α = ΔL/(L₀ΔT) = 0.002/(1×100) = 2×10⁻⁵ /°C.

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