1.True or False: Shear strain is the change in angle between two lines originally perpendicular to each other. 5. True or False: In a state of uniaxial tension, the stress is applied in one direction only. 6. True or False: The modulus of rigidity is the same as the modulus of elasticity. 7. True or False: Plastic deformation occurs when the material returns to its original shape after the removal of stress.