Question: Select the incorrect statement. a) Effective cohesion of a soil can never have a negative value. b) Effective angle of internal friction for coarse grained

Select the incorrect statement.

a) Effective cohesion of a soil can never have a negative value.

b) Effective angle of internal friction for coarse grained soils is rarely below 30.

c) Effective angle of internal friction for a soil increases as state of compact-ness increases.

d) Effective angle of internal friction is a complicated function of mineralogy and clay size

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