14) If the degree of saturation of a partially saturated soil is 60%, then air content of the soil is

15) If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is

16) The ratio of volume of voids to the total volume of soil mass is called

17) Relative density of a compacted dense sand is approximately equal to

18) If the sand in-situ is in its densest state, then the relative density of sand is