Multiple choice

The square root of the ratio of moment of inertia of the cross-section to its cross-sectional area is called

  1. second moment of area

  2. slenderness ratio

  3. section modulus

  4. radius of gyration
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D Correct answer
Explanation

 $\text{Square root of moment of inertia to cross-sectional area}\\ = \sqrt{\frac{I}{A}} = \sqrt{\frac{Ar^2}{A}} = \sqrt{r^2} = r \hspace{1cm} \text{(Radius of gyration)}$

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