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

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Soil Mechanics and Foundation
If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then

The liquid limit of soil may increase
The liquid limit of soil may decrease
The liquid limit of soil always decreases
The liquid limit of soil always increases

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