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A soil has porosity of 40% and air content of 50%.What will be its percentage air voids?

a) 30%
b) 60%
c) 20%
d) 50%

Answer: c
Explanation: Given,
Porosity n = 40% = 0.4
Air content ac = 50% = 0.5
Percentage air voids na= n*ac
na = 0.4*0.5
na = 20%.

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