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19.

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



20.

Coarse grained soils are best compacted by a                        
A. drum roller B. rubber tyred roller
C. sheep's foot roller D. vibratory roller



21.

Coefficient of compressibility is                        
A. constant for any type of soil B. different for different types of soils and also different for a soil under different states of consolidation
C. different for different types of soils but same for a soil under different states of consolidation D. independent of type of soil but depends on the stress history of soil




22.

Coefficient of consolidation for clays normally                        
A. decreases with increase in liquid limit B. increases with increase in liquid limit
C. first increases and then decreases with increase in liquid limit D. remains constant at all liquid limits



23.

Coefficient of consolidation of a soil is affected by                        
A. compressibility B. permeability
C. both compressibility and permeability D. none of the above



24.

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



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