Question

The strain stress curves of three wires of different materials are shown in the figure. P, Q and R are the elastic limits of the wires. The figure shows that

• A. Elasticity of wire P is maximum
• B. Elasticity of wire Q is maximum
• C. Tensile strength of R is maximum
• D. None of the above is true

Answer 1

The correct option is D None of the above is true

On the graph stress is represented on X- axis and strain Y-axis
So from the graph $Y=cot\theta =\frac{1}{tan\theta }\propto \frac{1}{\theta }$ [where $\theta$ is the angle from stress axis]
$\therefore Y_P$ < $Y_Q$ < $Y_R$ [ As ${\theta }_P$ > ${\theta }_Q$ > ${\theta }_R$ ]
We can say that elasticity of wire P is minimum and R is maximum.