question_answer 30)

                  The strees-strain graphs for two materials are shown in fig. (assume same scale). (a) Material (ii) is more elastic than material (i) and hence material (ii) is more brittle. (b) Material (i) and (ii) have the same elasticity and the same brittleness. (c) Material (ii) is elastic over a larger region of strain as compared to (i). (d) Material (ii) is more brittle than material (i).                

Answer:

                  (c, d) Material for which a small amount of plastic deformation takes place between the elastic limit and the fracture point is known as brittle material. Ultimate strength of material (ii) is greater than that of the material (i).