Q. 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
Explanation
(c) For twisting, Angle of shear $\phi \propto \frac{1}{L}$
$i.e.$ if $L$ is more then $\phi$ will be small
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.