Which type of stress leads to a change in length of a body without changing its shape?
Longitudinal stress (tensile or compressive) causes a change in length along the direction of the applied force without altering the shape of the body. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Longitudinal stress. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
