1) Asquare frame ABCD is formed by four identical rods each of mass m and length l, This frame is in XY- plane such that side AB coincides with X-axis and side AD along Y- axis. The moment of inertia of the frame about X-axis is A) $\frac{5ml^{2}}{3}$ B) $\frac{2ml^{2}}{3}$ C) $\frac{4ml^{2}}{3}$ D) $\frac{ml^{2}}{12}$ Answer: Option AExplanation:In the given figure, $l=l_{AB}+l_{BC}+l_{CD}+l_{DA}=0+\frac{ml^{2}}{3}+ml^{2}+\frac{ml^{2}}{3}$ or $l=\frac{5ml^{2}}{3}$
