Question

Which cross-section of the beam subjected to bending moment is more economical?

• A. Rectangular cross-section
• B. I - cross-section
• C. Circular cross-section
• D. Triangular cross-section

Hint:

I-beams are widely used in structural applications due to their high strength-to-weight ratio.

Answer 1

The Correct Option is B

Step 1: Understanding economical beam cross-sections. 
- The I-section provides maximum strength with minimum material. 
- This reduces material cost while ensuring high bending resistance. 
Step 2: Selecting the correct option. 
Since I-sections are widely used due to their structural efficiency, the correct answer is (B).