Soil Mechanics and Foundation
Quick sand is a

flow condition occurring in both cohesive and cohesionless soils
type of sand
flow condition occurring in cohesionless soils
flow condition occurring in cohesive soils

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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 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]

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