Which one of the following statement is wrong?

Explanation

The correct answer is Option A: 'Young's modulus for a perfectly rigid body is zero' because it is incorrect. A perfectly rigid body would have an infinite Young's modulus since it would not deform under any amount of applied stress, indicating infinite resistance to deformation. Option B is correct because the bulk modulus is applicable to solids, liquids, and gases, describing their responses to uniform compression. Option C is correct because, in terms of physics, steel is more elastic than rubber, meaning it returns to its original shape better after stress. Option D is correct because Young's modulus and shear modulus are indeed relevant for describing the mechanical behaviour of solids.