SSC JE Civil Engineering 2018 Set 5 Solved Paper

Coefficient of uniformly $\mathit{C}\mathit{u}=\frac{{\mathit{D}}_{60}}{{\mathit{D}}_{10}}$
${\mathit{D}}_{60}$ → It is the grain diameter below which 60% of particle exists
${\mathit{D}}_{10}$ → It in the grain diameter below which 10% of particle exists. (effective size). If Cu < 4 (Grovel) If Cu > 6 (sand).