Soil Mechanics and Foundation Engineering

131. If the specific gravity of a soil particle of 0.05 cm diameter is 2.67, its terminal velocity while settling in distilled water of viscosity, 0.01 poise, is

1. 0.2200 cm/sec
2. 0.2225 cm/sec
3. 0.2250 cm/sec
4. 0.2275 cm/sec

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132. If the unit weight of sand particles is 2.696 g/cc. and porosity in loose state is 44%, the critical hydraulic gradient for quick sand condition, is

1. 0.91
2. 0.92
3. 0.93
4. 0.95

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133. If the voids of a soil mass are full of air only, the soil is termed as

1. Air entrained soil
2. Partially saturated soil
3. Dry soil
4. Dehydrated soil

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134. If the volume of voids is equal to the volume of solids in a soil mass, then the values of porosity and voids ratio respectively are

1. 1.0 and 0.0
2. 0.0 and 1.0
3. 0.5 and 1.0
4. 1.0 and 0.5

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135. If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is

1. Less than specific gravity of soil
2. Equal to specific gravity of soil
3. Greater than specific gravity of soil
4. Independent of specific gravity of soil

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136. If the water table rises upto ground surface, then the

1. Effective stress is reduced due to decrease in total stress only but pore water pressure does not change
2. Effective stress is reduced due to increase in pore water pressure only but total stress does not change
3. Total stress is reduced due to increase in pore water pressure only but effective stress does not change
4. Total stress is increased due to decrease in pore water pressure but effective stress does not change

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137. If there is no impervious boundary at the bottom of a hydraulic structure, stream lines tend to follow:

1. A straight line
2. A parabola
3. A semi-ellipse
4. A semi-circle

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138. If voids ratio is 0.67, water content is 0.188 and specific gravity is 2.68, the degree of saturation of the soil, is

1. 25 %
2. 40 %
3. 60 %
4. 75 %

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139. If water content of a soil is 40%, G is 2.70 and void ratio is 1.35, the degree of saturation is

1. 70 %
2. 75 %
3. 80 %
4. 85 %

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140. In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear

1. Decreases
2. Increases
3. Remains unchanged
4. First increases and then decreases

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