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Question 6365
NEET Physics · Hard

Mechanical Properties of Solids: Thermal Stress MCQ

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Thermal StressHardQuestion 6365

Question

A railway track (L=1 km, steel, α=12×10⁻⁶/°C) heats by 40°C. If unconstrained, expansion:
  1. A
    0.48 m
    Correct
  2. B
    0.048 m
  3. C
    4.8 m
  4. D
    4.8 cm

Correct answer

0.48 m

Explanation

ΔL = LαΔT = 1000×12×10⁻⁶×40 = 1000×4.8×10⁻⁴ = 0.48 m.

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