Question

The A-line, in unified classification system table has the equation of __________

(a) IP=WL-20

(b) IP=0.73(WL-20)

(c) IP=0.73(20-wL)

(d) IP=20-WL

This question was addressed to me in class test.

My question is taken from Soils topic in division Classification of Soils of Geotechnical Engineering I

Answer 1

Correct choice is (b) IP=0.73(WL-20)

Explanation: The A-line, dividing the inorganic clay from silt and organic soil has the equation: IP=0.73(WL-20).