The shape factor of standard rolled beam section varies from A. 1.10 to 1.20 B. 1.20 to 1.30 C. 1.30 to 1.40 D. 1.40 to 1.50

The correct answer is A. 1.10 to 1.20.

The shape factor is a dimensionless number that is used to determine the effective area of a beam section. It is defined as the ratio of the area of the cross-section to the product of the depth and the width of the section.

The shape factor of a standard rolled beam section varies from 1.10 to 1.20. This means that the effective area of a standard rolled beam section is between 110% and 120% of the area of the cross-section.

The shape factor is important because it affects the strength of the beam. A beam with a higher shape factor is stronger than a beam with a lower shape factor.

The shape factor is also important because it affects the deflection of the beam. A beam with a higher shape factor will deflect less than a beam with a lower shape factor.

The shape factor is a useful tool for engineers who design beams. It allows them to select the most efficient beam section for a given application.

The other options are incorrect because they do not represent the range of shape factors for standard rolled beam sections.