Q1/ The proportional limit of a ductile material is always less than the yield strength. True or false?

Q1/ The proportional limit of a ductile material is always less than the yield strength. True or false?

Q2/ An metal bar 129 mm long and having a square cross section 17.5 mm on an edge is pulled in tension with a load of 64,200 N. It experiences an elongation of 0.43 mm. If the deformation is entirely elastic, what is the elastic modulus of the material, in GPa?