For a perfectly rigid body

Young's modulus is infinite and bulk modulus is zero

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Young's modulus is zero and bulk modulus is infinite

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Young's modulus is infinite and bulk modulus is also infinite

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Young's modulus is zero and bulk modulus is also zero

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Solution

The correct option is C Young's modulus is infinite and bulk modulus is also infinite
Young's modulus for a rigid body,
$Y = \frac{S t r e s s}{S t r a i n}$
Since, the perfect rigid body won't yield any strain, irrespective of the amount of stress.
$Y = \frac{s t r e s s}{0} = i n f i n i t e$
Bulk modulus for a rigid body is infinite because the rigid body is incompressible.
The correct option is C.

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