If the degree of saturation of a partially saturated soil is 60%, then air content of the soil is______________?
(A) 40%
(B) 60%
(C) 80%
(D) 100%
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
If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in______________?
(A) liquid state
(B) plastic state
(C) semi-solid state
(D) solid state
Toughness index is defined as the ratio of____________________?
(A) plasticity index to consistency index
(B) plasticity index to flow index
(C) liquidity index to flow index
(D) consistency index to liquidity index
At liquid limit, all soils possess________________?
(A) same shear strength of small magnitude
(B) same shear strength of large magnitude
(C) different shear strengths of small magnitude
(D) different shear strengths of large magnitude
The water content of soil, which represents the boundary between plastic state and liquid state, is known as_________________?
(A) liquid limit
(B) plastic limit
(C) shrinkage limit
(D) plasticity index
The admixture of coarser particles like sand or silt to clay causes______________?
(A) decrease in liquid limit and increase in plasticity index
(B) decrease in liquid limit and no change in plasticity index
(C) decrease in both liquid limit and plasticity index
(D) increase in both liquid limit and plasticity index
When the plastic limit of a soil is greater than the liquid limit, then the plasticity index is reported as_____________?
(A) negative
(B) zero
(C) non-plastic (NP)
(D) 1
If the plasticity index of a soil mass is zero, the soil is______________?
(A) sand
(B) silt
(C) clay
(D) clayey silt