Soil Mechanics and Foundation
Hydrometer readings are corrected for:

Temperature, meniscus and dispersing agent corrections
Meniscus correction
Dispersing agent correction
Temperature correction

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

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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

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

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