text: A soil sample has a void ratio of 0.5; its porosity will be
  
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  A soil sample has a void ratio of 0.5; its porosity will be
  1. 50%
  2. 66%
  3. 100%
  4. 33%
  
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  Correct Answer - Option 4 : 33%
  
  Concept:
  
  Void ratio (e): Void ratio is usually defined as the ratio of the volume of voids to the total volume of soil solid.
  
  Porosity (n): Porosity is defined as the ratio of the volume of voids to the total volume of the soil.
  
  The relationship between void ratio and porosity are as follows:
  
  $\rm{e=\frac{n}{1-n}\; and\; n=\frac{e}{1+e}}$
  
  Solution:
  
  Void, Ratio, e = 0.5
  
  Porosity, $n=\frac{e}{1+e}$
  
  η = 0.5/1.5 = 0.33