Soil Mechanics and Foundation
The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is

Inclined at 45° to the vertical plane
Vertical if the soil is in a passive state of plastic equilibrium
None of these
Vertical if the soil is in an active state of plastic equilibrium

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Soil Mechanics and Foundation
Coefficient of earth pressure at rest is

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

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Soil Mechanics and Foundation
The total discharge from two wells situated near to each other is

less than the sum of the discharges from individual wells
greater than the sum of the discharges from individual wells
sum of the discharges from individual wells
equal to larger of the two discharges from individual wells

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