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Question
Select the incorrect statement.
Options:
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 content.
Answer: Option A

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