Correct Answer - Option 1 : percentage by weight of clay fraction
Concept:
The Activity of the soil (A)
The activity of the soil is given by the ratio of the plasticity index (Ip) and the percentage of clay fraction (C) in the soil.
It indicates water absorption capacity or indicates swelling and shrinkage characteristics.
Activity \(A_c= \frac{{Plasticity\;Index}}{{Per\;cent\;of\;clay\;particles\;finer\;than\;2\;\mu m}}\)
So, C = Percentage of clay fraction finer than 2 μ
