Correct Answer - Option 4 : 545.0

Given,

Pressure head = 100 m

So, P = ρg H

P = 10^{3} × 9.81 × 100 ........(ρ = 10^{3} kg / m3, g = 9.81)

P = 981000 N/m^{2};

Tensile stress in pipe wall = circumferential stress in pipe wall

So, tensile stress in pipe wall \(= \frac {Pd}{2t}\)

\(= \frac {981000 × 10}{2 × 9 × 10^{-3}}\)

= 545 × 106 N/m^{2}

= 545 MPa