The Young's modulus of a perfectly rigid body is

unity

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zero

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Infinity

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some finite non-zero constant

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Solution

The correct option is C Infinity
Young modulus= $\frac{S t r e s s}{S t r a i n}$
Since the body is perfectly rigid, it will not experience any change in length and hence strain tends to zero.
Thus, Y tends to infinity.

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Young’s modulus of a perfectly rigid body is

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