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 C tensile strength of $R$ is maximum

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)

$\therefore Y_P<Y_Q<Y_R$

we can say that elasticity of wire $P$ is minimum and $R$ is maximum.