If the permeability of a soil is 0.8 mm/sec, the type of soil is
A. gravel
B. sand
C. silt
D. clay
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A tri-axial shear test is preferred to direct shear test, because
A. It can be performed under all three drainage conditions with complete control
B. Precise measurement of pore pressure and change in volume during test, is not possible
C. Stress distribution on the failure plane, is non uniform
D. None of these
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Contact pressure beneath a rigid footing resting on cohesive soil is
A. less at edges compared to middle
B. more at edges compared to middle
C. uniform throughout
D. none of the above
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Select the incorrect statement. Effective angle of shearing resistance
A. increases as the size of particles increases
B. increases as the soil gradation im-proves
C. is limited to a maximum value of 45°
D. is rarely more than 30° for fine grained soil
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Which of the following methods is best suited for determination of permeability of coarse-grained soils ?
A. constant head method
B. falling head method
C. both the above
D. none of the above
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If the sand in-situ is in its densest state, then the relative density of sand is
A. zero
B. 1
C. between 0 and 1
D. greater than 1
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A soil has a bulk density of 22 kN/m3 and water content 10%. The dry density of soil is
A. 18.6 kN/m3
B. 20.0 kN/m3
C. 22.0 kN/m3
D. 23.2 kN/m3
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Coefficient of earth pressure at rest is
A. less than active earth pressure but greater than passive earth pressure
B. greater than active earth pressure but less than passive earth pressure
C. greater than both the active earth pressure and passive earth pressure
D. less than both the active and passive earth pressures
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When the plastic limit of a soil is greater than the liquid limit, then the plasticity index is reported as
A. negative
B. zero
C. non-plastic (NP)
D. 1
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Voids ratio of a soil mass can
A. never be greater than unity
B. be zero
C. take any value greater than zero
D. take values between 0 and 1 only
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Effective stress is
A. the stress at particles contact
B. a physical parameter that can be measured
C. important because it is a function of engineering properties of soil
D. all of the above
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In the plate loading test for determining the bearing capacity of soil, the size of square bearing plate should be
A. less than 300 mm
B. between 300 mm and 750 mm
C. between 750 mm and 1 m
D. greater than 1 m
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The clay mineral with the largest swelling and shrinkage characteristics is
A. kaolinite
B. illite
C. montmorillonite
D. none of the above
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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
A. The liquid limit of soil always increases
B. The liquid limit of soil always decreases
C. The liquid limit of soil may increase
D. The liquid limit of soil may decrease
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According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is
A. 0 < PI < 7
B. 7< PI < 17
C. 17 < PI < 27
D. PI > 27
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Which of the following is a measure of particle size range ?
A. effective size
B. uniformity coefficient
C. coefficient of curvature
D. none of the above
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Sand particles are made of
A. rock minerals
B. kaolinite
C. illite
D. montmorillonite
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Uniformity coefficient of a soil is
A. always less than 1
B. always equal to 1
C. equal to or less than 1
D. equal to or gi eater than 1
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Coefficient of consolidation of a soil is affected by
A. compressibility
B. permeability
C. both compressibility and permeability
D. none of the above
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The ratio of volume of voids to the total volume of soil mass is called
A. air content
B. porosity
C. percentage air voids
D. voids ratio
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