$2$ Metals, polymers and ceramic are the three main types of materials that can be used in any various application.

a$.$ Compare TWO $(2)$ differences for each metal, polymer and ceramic.

$[18$ marks$]$

b$.$ Propose ONE $(1)$ material that can be used for each part in $($i$)$ load$-$bearing beams, and $($ii$)$ walls. Discuss the properties and the advantages of each material selection.

$[16$ marks$]$

c$.$ Based on the Fe$-$C Phase Diagram in Appendix, identify the name of phases that present and sketch the microstructure of metal $A,B$ and $C$ composition assuming equilibrium cooling start at $1000C.$

$[16$ marks$]$