Soil Mechanics and Foundation
Effective stress is

All of these
the stress at particles contact
a physical parameter that can be measured
important because it is a function of engineering properties of soil

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Soil Mechanics and Foundation
Coefficient of earth pressure at rest is

greater than both the active earth pressure and passive earth pressure
less than active earth pressure but greater than passive earth pressure
less than both the active and passive earth pressures
greater than active earth pressure but less than passive earth pressure

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