A) Sliding of molecular layer is much easier than compression or expression
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 mass
Correct Answer: C
Solution :
For twisting. Angle of shear \[\phi =\frac{l}{L}\] ie, if L is more then\[\phi \]will be small.
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