The figure shows the stress-strain curve for a given material. The approximate yield strength for this material is:
         
1. \(3\times10^8~\text{N/m}^2\)
2. \(2\times10^8~\text{N/m}^2\)
3. \(4\times10^8~\text{N/m}^2\)
4. \(1\times10^8~\text{N/m}^2\)
$\mathrm{}$

The stress-strain graphs for materials A and B are shown in the figure. Young’s modulus of material A is (the graphs are drawn to the same scale):

The stress-strain graphs for materials \(A\) and \(B\) are shown in the figure. Strength of material \(A\) is:
(The graphs are drawn to the same scale)