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
Correct Answer: C
Solution :
For twisting, Angle of shear \[\varphi \propto \frac{1}{L}\] i.e. if L is more then \[\varphi \] will be small.
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