Q1: Design of R.C.C. cantilever beams, is based on the resultant force at

ANS:A - fixed end

The design of reinforced concrete (R.C.C.) cantilever beams is typically based on the resultant force at the fixed end. In a cantilever beam, one end is fixed, and the other end is free. The fixed end experiences reactions due to the applied loads and constraints imposed by its attachment to a structure or support. These reactions include both vertical and horizontal components, resulting in a resultant force at the fixed end. This resultant force includes the combined effects of the applied loads, reactions, and moments. Designing based on the resultant force at the fixed end allows engineers to analyze the structural behavior of the cantilever beam accurately. It helps determine the required reinforcement, dimensions, and other design parameters to ensure that the beam can safely support the applied loads and resist bending, shear, and other internal forces. Therefore, in the design process of R.C.C. cantilever beams, engineers typically focus on analyzing and accommodating the resultant force at the fixed end to ensure the structural integrity and stability of the beam under various loading conditions.