Question

Mark the wrong statement

• 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 1

Answer: (C)

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

Answer 2

For twisting, Angle of shear $\phi \propto \frac { 1 } { L }$

i.e. if L is more then $\phi$ will be small.