Correct Answer - Option 1 : Zero

__Explanation:__

**Degree of saturation:**

\({\bf{S}} = \frac{{{{\bf{V}}_{\bf{w}}}}}{{{{\bf{V}}_{\bf{v}}}}} = \frac{{{\bf{Volume}}{\rm{ }}\ {\bf{of}}{\rm{ }}\ {\bf{water}}}}{{{\bf{Volume\ }}{\rm{ }}{\bf{of}}{\rm{ }}\ {\bf{voids}}}}\)

When soil is perfectly dry, The** Volume of water = 0**

**Then, Degree of saturation = 0.**

For fully saturated soil, **Degree of saturation = 1**

Because** Volume of water = volume of voids**

** **Hence, **degree of saturation varies between 0 and 1.**