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

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

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

Effective angle of internal friction is a complicated function of mineralogy and clay size content.

ultimate strength is same and also peak strength is same

ultimate strength is different but peak strength is same

ultimate strength is same but peak strength of dense sand is greater than that of loose sand

ultimate strength is same but peak

is directly proportional to the angle of internal friction of the soil

is inversely proportional to the angle of internal friction of the soil

decreases with increase in normal stress

decreases with decrease in normal stress

decreases

increases

remains unchanged

first increases and then decreases

1

zero

between 0 and 1

greater than 1[CS 95]