Why are I-shaped beams commonly used in construction for load-bearing applications?
I-shaped beams provide a large load-bearing surface and sufficient depth to reduce bending, minimizing buckling while reducing weight compared to solid beams. As per NCERT, applying relevant law/formula with correct units and sign convention leads to They provide a large load-bearing surface with reduced bending. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.