Q: Young’s modulus of perfectly rigid body material is
(a) zero
(b) infinity
(c) 1 × 1010 N/m2
(d) 10 × 1010 N/m2
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Ans: (b)
Sol: Young’s Modulus = Stress/Strain
For a rigid body Whatever be the value of Stress , Strain is always zero . Hence Young’s modulus is infinite .