$2$ a$)$ What happens if soil is compacted? How does compaction affect engineering properties of soils?

b$)$ Write down the rames of different methods of compaction those are carried out in the field. Draw compactions curves for Standard Proctor Test and Modified Proctor Test.

c$)$ The maximum dry density of a compacted soil mass is found to be $18k\frac{N}{m^3}$ with optimum water content being $15\%.$ Find the degree of saturation of this compacted soil if specific gravity of soil of this soil is given as $2\mathrm{.}65.$ What will be the value of the maximum dry density it can be further compacted to$?$