Question

Based on the observation made by Skempton, for a given soil __________

(a) Plastic index is proportional to percent of clay-size fraction

(b) Plastic index is inversely proportional to percent of clay-size fraction

(c) Plastic index is equal to percent of clay-size fraction

(d) None of the mentioned

This question was posed to me by my college director while I was bunking the class.

This key question is from Activity of Clays in chapter Index Properties Determination of Geotechnical Engineering I

Answer 1

Right choice is (a) Plastic index is proportional to percent of clay-size fraction

The best explanation: In 1953 skempton, observed that for a given soil the plasticity index is proportional to the percent of clay-size fraction.