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

19) Which of the following methods is most accurate for the determination of the water content of soil

20) For proper field control, which of the following methods is best suited for quick determination of water content of a soil mass