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Reciprocal of bulk modulus of elasticity is called compressibility

It is difficult to twist a long rod as compared to small rod

Sliding of molecular layer is much easier than compression or expansion

Hollow shaft is much stronger than a solid rod of same length and same mass

answer is C.

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Detailed Solution

For twisting, Angle of shear $φ \infty \frac{1}{L}$

i.e., if L is more than $φ$ will be small.

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