When the seepage pressure becomes equal to the pressure due to submerged weight

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Question
When the seepage pressure becomes equal to the pressure due to submerged weight of a soil, the effective pressure is reduced to zero and the soil particles have a tendency to move up in the direction of flow. This phenomenon is generally known
Options
A. quick condition
B. boiling condition
C. quick sand
D. all the above.

Correct Answer

all the above.

Soil Mechanics and Foundation Engineering problems

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3. Pick up the correct statement from the following:
Options
A. The void ratio in soils is defined as the ratio of the volume of voids to the volume of solids
B. The porosity of a soil is defined as the ratio of the volume of voids to the gross volume of the soil
C. The bulk density of a soil is defined as the unit weight of the soil
D. The dry density of a soil is defined as weight of solids to the total volume of the soil
E. All the above.

4. The critical exist gradient of seepage water in soils, increases with
Options
A. an increase in specific gravity
B. a decrease in specific gravity
C. a decrease in void ratio
D. both (a) and (c)
E. none of these.

5. The shear strength of a soil
Options
A. increases with an increase in the normal stress
B. is proportional to the cohesion of the soil
C. is generally known as the strength of the soil
D. is proportional to the tangent of the angle of internal friction
E. all the above.

6. In a fow net
Options
A. flow lines and equipotential lines cross each other at right angles
B. fields are rectangles whose length is twice the breadth
C. smaller the dimensions of the field, smaller will be the hydraulic gradient and velocity of flow through it
D. for homogeneous soil, the curves are smooth and circular.

7. A soil mass coated with a thin layer of paraffin weighs 460 g. When immersed, it displaces 299 cc of water. The weight of paraffin is 10 g. If specific gravity of solids is 2.5 and that of paraffin 0.9, the void ratio of soil, is
Options
A. 0.55
B. 0.60
C. 0.65
D. 0.70

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