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The stress-strain graphs of two materials (i) and (ii) are plotted on the same scale. Material (ii) has a steeper line and fractures at a smaller strain than material (i). Which statement is correct?

1. Material (ii) is more elastic than material (i) and hence material (ii) is more brittle.
2. Material (i) and (ii) have the same elasticity and the same brittleness.
3. Material (ii) is elastic over a larger region of strain as compared to (i).
4. Material (ii) is more brittle than material (i).

Correct answer: Material (ii) is more brittle than material (i).

Solution

Material (ii) shows little strain before fracture (small plastic region), so it is more brittle than (i).

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