MCQ
Young’s modulus of perfectly rigid body material is
  • A
    Zero
  • Infinity
  • C
    ${\rm{1}} \times {\rm{1}}{{\rm{0}}^{{\rm{10}}}}\,N/{m^2}$
  • D
    ${\rm{10}} \times {\rm{1}}{{\rm{0}}^{{\rm{10}}}}\,N/{m^2}$

Answer

Correct option: B.
Infinity
b
(b) From Hooke's law, Young modulus $Y=\frac{S t r e s s}{S t r a i n}$

The Strain produced in a perfectly rigid body is zero i.e Strain$=0$

$\therefore Y=\frac{S t r e s s}{0} \quad \Longrightarrow Y=\infty$

Thus the Young's modulus of perfectly rigid body material is infinite.

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