Ncert Exercises & Solutions

The stress-strain graphs for the two materials are shown in the figure. (assumed 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)

The correct statements are:

1. (a, c)
2. (c, d)
3. (b, c)
4. (b, d)

(2) Hint: The ultimate tension strength gives the elasticity of the material.

Step 1: Find the ultimate strength of the materials in two cases.

It is clear from the two graphs, the ultimate tensile strength for material (ii) is greater, here material (ii) is elastic over a larger region as compared to material (i).

For material (ii), the fracture point is nearer, hence it is more brittle.

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