Quostion $1[5$ Marks$]$

Describe the primary purpose of using timbering in excavation work.

$[5]$

Question $2[9$ Marks$]$

$2\mathrm{.}1$ Explain why it is necessary to lay bricks according to a recognized bond.

$[3]$

$2\mathrm{.}2$ Identify which bond you would use for a half$-$brick wall construction project and explain why.

$2\mathrm{.}3$ In a construction project requiring access to high$-$level areas of a building that cannot support any additional load, chooso which type of scaffold you would use and explain why.

Question $3[10$ Marks$]$

$3\mathrm{.}1$ Evaluate the importance of transition curves in vertical alignments.

$[2]$

$3\mathrm{.}2$ Compare the factors that govern the dosign of crest curves and sag curves.

$[4]$

$3\mathrm{.}3$Calculate the length of a crest curve needed between two gradients of $+2\mathrm{.}5\%$ and $-1\mathrm{.}8\%$ for a road with a design speed of $70k\frac{m}{h}.$

$4$

Given: K$-$value for crest curve at $70k\frac{m}{h}$:$23$