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

Answer: (D)

None of the above is true

Answer 2

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 θ 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.