Soil Mechanics and Foundation Engineering

121. If the degree of saturation of a partially saturated soil is 60%, then air content of the soil is

1. 40 %
2. 60 %
3. 80 %
4. 100 %

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122. If the failure of a finite slope occurs through the toe, it is known as

1. Slope failure
2. Face failure
3. Base failure
4. Toe failure

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123. 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

1. The liquid limit of soil always increases
2. The liquid limit of soil always decreases
3. The liquid limit of soil may increase
4. The liquid limit of soil may decrease

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124. If the natural moisture content, the liquid limit and plastic limit of a soil sample are stated as 30.5%, 42.5% and 22.5% respectively, the ratio of liquidity index and plastic index, is

1. ⅓
2. ½
3. 2
4. 2½

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125. If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in

1. Liquid state
2. Plastic state
3. Semisolid state
4. Solid state

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126. If the permeability of a soil is 0.8 mm/sec, the type of soil is

1. Gravel
2. Sand
3. Silt
4. Clay

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127. If the plasticity index of a soil mass is zero, the soil is

1. Sand
2. Silt
3. Clay
4. Clayey silt

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128. If the sand in-situ is in its densest state, then the relative density of sand is

1. Zero
2. 1
3. Between 0 and 1
4. Greater than 1

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129. If the shearing stress is zero on two planes, then the angle between the two planes is

1. 45°
2. 90°
3. 135°
4. 225°

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130. If the specific gravity and voids in soil sample are G and e respectively, the hydraulic gradient i, is

1. (G - 1)/(1 + e)
2. (G + 1)/(1 - e)
3. (1 - G)/(1 + e)
4. (1 + G)/(1 + e)

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