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Question
A sample of dry soil is coated with a thin layer of paraffin and has a mass of 460 g. It displaced 300 cc of water when immersed in it. The paraffin is peeled off and its mass was found to be 9 g. If the specific gravity of soil solids and paraffin are 2.65 and 0.9 respectively, the voids ratio of soil is nearly
A.
0.92
B.
0.71
C.
0.59
D.
0.48
Answer ( Option B)

0.71

Solution

Mass of soil + paraffin = 460 g
Mass of paraffin = 9g
Mass of soil = 451 g
Volume of soil + volume of paraffin
= 300cc
Volume of soil = 290 cc
Dry density of soil i.e. γd ,

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