We know that the rigid property can be characterized by the modulus of rigidity (shearing modulus) which is the ratio of shear stress to shear strain, i.e.
Shear modulus = Shear stress / shear strain
For same shear stress, shear strain in the iron is more than that of in stone, i.e. stone offers more resistance to the deforming force than iron. Hence, stone is more rigid than iron.
This post was part of TyroCity discussion forum
Question asked by chimini_chand
Answered by drupadh_thapa