Soil Mechanics and Foundation
The total and effective stresses at a depth of 5 m below the top level of water in a swimming pool are respectively

0.5 kg/cm² and zero
0.5 kg/cm² and 0.5 kg/cm²
zero and zero
1.0 kg/cm² and 0.5 kg/cm²

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

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

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Soil Mechanics and Foundation
The effect of cohesion on a soil is to

increase both the active earth pressure intensity and passive earth pressure intensity
reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
increase the active earth pressure in-tensity but to reduce the passive earth pressure intensity [GATE 99]
reduce both the active earth pressure intensity and passive earth pressure intensity

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