21.Inorganic soils with low compressibility are represented by

22.The clay mineral with the largest swelling and shrinkage characteristics is

23.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

24.According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is

25.Uniformity coefficient of a soil is