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Civil Engineering Objective Questions { Soil Mechanics And Foundation Engineering }

71. A coarse-grained soil has a voids ratio 0.75, and specific gravity as 2.75. The critical gradient at which quick sand condition occurs, is
D. 1.00.

72.  A critical hydraulic gradient may occur when
A. flow is in upward direction
B. seepage pressure is in upward direction
C. effective pressure is zero
D. all the above.

73. Darcy's law is applicable to seepage if a soil is
A. homogeneous
B. isotropic
C. incompressible
D. all the above.

74. During seepage through a soil, direction of seepage is always
A. parallel to equipotential lines
B. perpendicular to stream lines
C. perpendicular to equipotential lines
D. none of these.

75.  If there is no impervious boundary at the bottom of a hydraulic structure, stream lines tend to follow :
A. a straight line
B. a parabola
C. a semi-ellipse
D. a semi-circle.

76. The quantity of seepage of water through soils is proportional to
A. coefficient of permeability of soil
B. total head loss through the soil
C. neither A nor (b)
D. both (a) and (b).

77. The seepage force in a soil, is
A. perpendicular to the equipotential lines
B. proportional to the exit gradient
C. proportional to the head loss
D. all the above.

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