CAPE Physics Unit 1 · 2008 (Rest of Region) · Paper 1 · Question Q45

Which one of the statements about deformation of solids is NOT true?

1. (A)A solid behaves elastically if no permanent deformation takes place after the force has been removed.
2. (B)Stress is the extension per unit length of the material. It has no units.
3. (C)All solids are elastic when small forces are attached to them.
4. (D)In stretching a material, the work done is stored as strain energy, once Hooke's Law applies.