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Civil Engineering Objective Questions { Soil Mechanics And Foundation Engineering }

204.  Pick up the correct statement from the following :
A. The dry density reduces by addition of water after attaining optimum moisture content
B. The line joining the peak of three moisture content graphs obtained by using three compactive energies, is called line of optimus
C. Well graded coarse grained soils can be compacted to a very high density as compared to fine grained soils
D. All the above.
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205.  Pick up the incorrect statement from the following :
A. Compaction has no effect on the structure of a soil
B. Permeability decreases with increase in the dry density of a compacted soil
C. A wet side compacted soil is more compressible than a dry side compacted soil
D. Dry side compaction soils swell more when given access to moisture
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206. 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
D. 0.70.
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207.  A structure is erected on an impervious clay whose thickness is 12 m. Drainage is possible both at upper and lower surfaces. Coefficient of consolidation is 0.015 cm2 per minute. For attaining 50% consolidation with a time factor 0.20, the number of days required
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208.  Pick up the correct statement from the following :
A. Coefficient of compressibility is the decrease in void ratio per unit increase of pressure
B. The percent settlement at any time is called degree of consolidation
C. Time factor is a dimensionless quantity
D. All the above.
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209.  The void ratio of a soil sample decreases from 1.50 to 1.25 when the pressure is increased from 25 tonnes/m2 to 50 tonnes/m2, the coefficient of compressibility is
D. 0.001.
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210.  If the coefficients of volume change and compressibility of a soil sample are respectively 6.75 x 10-2 and 3 * 10-2, the void ratio of the soil sample, is
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