In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as
A. consolidated drained test
B. consolidated undrained test
C. unconsolidated drained test
D. unconsolidated undrained test
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A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/m2 . If the effective stress is further increased from 200 kN/m2 to 400 kN/m2 , then the settlement of the same clay is
A. 10 mm
B. 20 mm
C. 40 mm
D. none of the above
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The total discharge from two wells situated near to each other is
A. sum of the discharges from individual wells
B. less than the sum of the discharges from individual wells
C. greater than the sum of the discharges from individual wells
D. equal to larger of the two discharges from individual wells
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Direct measurement of permeability of the specimen at any stage of loading can be made
A. only in fixed ring type consolido-meter
B. only in floating ring type consolido-meter
C. both (A) and (B)
D. none of the above
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The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing
A. cohesion and effective angle of shearing resistance
B. cohesion and effective unit weight of soil
C. effective unit weight of soil and effective angle of shearing resistance
D. effective angle of shearing resistance
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A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of
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The total and effective stresses at a depth of 5 m below the top level of water in a swimming pool are respectively
A. Zero and zero
B. 0.5 kg/cm2 and zero
C. 0.5 kg/cm2 and 0.5 kg/cm2
D. 1.0 kg/cm2 and 0.5 kg/cm2
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Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively.
A. increases by 25%
B. increases by 50%
C. increases by 33.3%
D. decreases by 33.3%
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At liquid limit, all soils possess
A. same shear strength of small magnitude
B. same shear strength of large magnitude
C. different shear strengths of small magnitude
D. different shear strengths of large magnitude
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Sensitivity of a soil can be defined as
A. percentage of volume change of soil under saturated condition
B. ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state
C. ratio of volume of voids to volume of solids
D. none of the above
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Valid range for n, the percentage voids, is
A. 0 < n < 100
B. 0 ≤ n ≤ 100
C. n > 0
D. n < 0
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Rankine’s theory of earth pressure assumes that the back of the wall is
A. plane and smooth
B. plane and rough
C. vertical and smooth
D. vertical and rough
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The most suitable method for drainage of fine grained cohesive soils is
A. well ppint system
B. vacuum method
C. deep well system
D. electroosmosis method
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With the increase in the amount of compaction energy
A. optimum water content increases but maximum dry density decreases
B. optimum water content decreases but maximum dry density increases
C. both optimum water content and maximum dry density increase
D. both optimum water content and maximum dry density decrease[ES 93]
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In a deposit of normally consolidated clay
A. effective stress increases with depth but water content of soil and un-drained strength decrease with depth
B. effective stress and water content increase with depth but undrained strength decreases with depth
C. effective stress and undrained strength increase with depth but water content decreases with depth
D. effective stress, water content and undrained strength decrease with depth
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Which of the following methods is most accurate for the determination of the water content of soil ?
A. oven drying method
B. sand bath method
C. calcium carbide method
D. pycnometer method
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The maximum dry density upto which any soil can be compacted depends upon
A. moisture content only
B. amount of compaction energy only
C. both moisture content and amount of compaction energy
D. none of the above
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Toughness index is defined as the ratio of
A. plasticity index to consistency index
B. plasticity index to flow index
C. liquidity index to flow index
D. consistency index to liquidity index
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The value of compression index for a remoulded sample whose liquid limit is 50% is
A. 0.028
B. 0.28
C. 0.36
D. 0.036
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For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as
A. dry of OMC and wet of OMC
B. wet of OMC and dry of OMC
C. wet of OMC and wet of OMC
D. dry of OMC and dry of OMC where OMC is optimum moisture content
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