Question

The behaviour of coarse-grained soils is not governed by ________

(a) gravitational forces

(b) mass energy

(c) colloidal forces

(d) interaction with pore fluid

The question was asked during a job interview.

My question is from Flocculent and Dispersed Structures in division Soil Structure and Clay Minerology of Geotechnical Engineering I

Answer 1

Correct answer is (c) colloidal forces

For explanation I would say: The particles of coarse-grained soils are sometimes called as bulky particles and these do not possess plasticity and cohesion. Their behaviour is primarily governed by gravitational forces and mass energy rather than colloidal forces.