$(4)*($a$)$ Define compaction. When will you recommend compaction in the field? Why? Give

reasons.

$($b$)$ Will the field compaction be the same as lab compaction? Why?

$($c$)$ From a compaction test the dry density of a soil was found to be $(1,760+N)k\frac{g}{m^3}$ when

the water content was $15\%.$ To determine the shear strength of the soil in this condition a

cylinder test specimen $100$ mm in diameter and $200$ mm long was prepared. Find the mass of

oven dried soil and the water required for the specimen. What would be the degree of

saturation assuming the specific gravity was $2\mathrm{.}65.($N is the student number$)$