Soil Mechanics and Foundation
Highway Research Board (HRB) classification of soils is based on

None of these
both particle size composition and plasticity characteristics
plasticity characteristics
particle size composition

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

reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
increase both the active earth pressure intensity and passive earth pressure intensity
reduce both the active earth pressure intensity and 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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Soil Mechanics and Foundation
Effective stress on soil

Increases both voids ratio and permeability
Decreases both voids ratio and permeability
Increases voids ratio and decreases permeability
Decreases voids ratio and increases permeability

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Soil Mechanics and Foundation
For a loose sand sample and a dense sand sample consolidated to the same effective stress

ultimate strength is same and also peak strength is same
ultimate strength is same but peak
ultimate strength is different but peak strength is same
ultimate strength is same but peak strength of dense sand is greater than that of loose sand

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