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Question 30837
JEE Physics · Hard

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

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Thermal StressHardQuestion 30837

Question

For minimum thermal stress in a constrained rod when cooled, rod material should have:
  1. A
    High Y and high α
  2. B
    Low Y and low α
    Correct
  3. C
    High Y and low α
  4. D
    Low Y and high α

Correct answer

Low Y and low α

Explanation

Stress = YαΔT. To minimize stress, both Y and α should be low. Low-modulus, low-expansion materials develop least thermal stress.

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