Soil Mechanics and Foundation
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

12 months
6 months
24 months
3 months

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Soil Mechanics and Foundation
A tri-axial shear test is preferred to direct shear test, because

It can be performed under all three drainage conditions with complete control
Stress distribution on the failure plane, is non uniform
Precise measurement of pore pressure and change in volume during test, is not possible
None of these

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Soil Mechanics and Foundation
Rise of water table above the ground surface causes

Increase in pore water pressure but decrease in total stress
Equal decrease in pore water pressure and total stress
Decrease in pore water pressure but increase in total stress
Equal increase in pore water pressure and total stress

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Soil Mechanics and Foundation
A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45°. The values of cohesion and angle of internal friction for the soil are respectively

0.05 N/mm² and 0°
0.5 N/mm² and 30°
0.2 N/mm² and 0°
0.05 N/mm² and 45°

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