Shown below is a simply supported light beam, ABCD.

$4\mathrm{.}2\mathrm{.}1$ Calculate the reaction forces at the support A and $D,$ and test the answer.

$4\mathrm{.}2\mathrm{.}2$ Calculate the bending moments at points $A,B,C$ and $D.$

$1\mathrm{.}3$ Draw a bending$-$moments diagram.

$2\mathrm{.}4$ Draw a shear$-$force diagram.

TOTAL :$50$ MARKS