State whether the followings are True or False? (1) The angle ofinternal friction can vary from 0 to 90˚ since it is an angle. (2)A degree of saturation of 40% implies that 40% of the total volumeconsists of water. (3) Clays can have both cohesion and angle ofinternal friction. (4) In the triaxial test the horizontal plane isthe major principal plane. (5) Piping (failure due high exithydraulic gradient downstream) starts upstream and then progress todownstream face of a concrete dam. (6) It is safe to say that: ingeneral natural soils in the field have larger permeability in thehorizontal direction than the vertical direction. (7) Due toconsolidation ∆? ?????????,?ℎ?? ? ?????????. (8) Consolidation isprocess of reducing voids by removing water and air if present. (9)In seepage in two dimensional impervious boundaries areequipotential lines. (10) Lowering the ground water table willincrease the shear strength of the soil. (11) Due to consolidationthe effective stress will increase. (12) Increasing the waterpressure head at both upstream and downstream by 1 m will reducepiping.
