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Q: The rolled steel I-sections are most commonly used as beams because these provide: (1) large moment of inertia with less cross-sectional area (2) greater lateral stability
  • A. Only 1
  • B. Only 2
  • C. 1 and 2
  • D. None of these
Correct Answer: Option C - The rolled steal I–section are most commonly used as beam because– (i) It has large moment of inertia with less cross–sectional area. (ii) It has large moment of resistance as compared to other section. (iii) It has very good lateral stability.
C. The rolled steal I–section are most commonly used as beam because– (i) It has large moment of inertia with less cross–sectional area. (ii) It has large moment of resistance as compared to other section. (iii) It has very good lateral stability.

Explanations:

The rolled steal I–section are most commonly used as beam because– (i) It has large moment of inertia with less cross–sectional area. (ii) It has large moment of resistance as compared to other section. (iii) It has very good lateral stability.