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.Management Sciences
Category: Soil Mechanics and Foundation Engineering
Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is_________________?
A. 3 months
B. 6 months
C. 12 months
D. 24 months
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<PI27
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
Select the correct statement?
A. Unit weight of dry soil is greater than unit weight of wet soil
B. For dry soils, dry unit weight is less than total unit weight
C. Unit weight of soil increases due to submergence in water
D. Unit weight of soil decreases due to submergence in water
Skempton’s pore pressure coefficient B for saturated soil is________________?
A. 1
B. zero
C. between 0 and 1
D. greater than 1
Compressibility of sandy soils is______________?
A. almost equal to that of clayey soils
B. much greater than that of clayey soils
C. much less than that of clayey soils
D. none of the above
Coefficient of permeability of soil______________?
A. does not depend upon temperature
B. increases with the increase in temperature
C. increases with the decrease in temperature
D. none of the above
Effective stress on soil_____________?
A. increases voids ratio and decreases permeability
B. increases both voids ratio and permeability
C. decreases both voids ratio and permeability
D. decreases voids ratio and increases permeability
Which of the following types of soil is transported by gravitational forces ?
A. loess
B. talus
C. drift
D. dune sand
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