Figure shows the strain-stress curve for a given material. What are

$A.$ Young's modulus
$B.$ approximate yield strength for this material?

From graph we can see that

$\text{Strees}=150\times {10}^{6}N/m^2$ when $\text{strain}=0.002$
And we know

Young's modulus, $Y=\frac{Stress}{Strain}$
$Y=\frac{150\times {10}^6}{0.002}$
$Y=7.5\times {10}^{10}N/m^2$


Yield strength of a material is stress at which the material begins to deform plastically. The Yield point is the point on the curve after which stress gradually starts to decrease. From graph,
Yield strength $=300\times {10}^{6}N/m^2$
$=3\times {10}^{8}N/m^2$