Mark the wrong statement

Options

A. Sliding of molecular layer is much easier than compression or expansion.
B. Reciprocal of bulk modulus of elasticity is called compressibility
C. It is difficult to twist a long rod as compared to small rod
D. Hollow shaft is much stronger than a solid rod of same length and same mass

Answer

C

Explanation

For twisting, angle of shear `phiprop(1)/(L)`
i.e., if `L` is more than `phi` will be small.