Soil Mechanics and Foundation
Allowable bearing pressure for a foundation depends upon

both allowable settlement and ultimate bearing capacity
allowable settlement only
none of above
ultimate bearing capacity of soil only

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content decreases but maximum dry density increases
optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density increase
both optimum water content and maximum dry density decrease[ES 93]

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

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

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