SSC JE Civil Engineering 2018 Set 3 Solved Paper

Pycnometer is used to determine water content and specific gravity.
$\left[\mathrm{Specific}\mathrm{gravity}\left(\mathit{G}\right)=\frac{{\mathit{w}}_2-{\mathit{w}}_1}{{\mathit{w}}_4-{\mathit{w}}_3+{\mathit{w}}_2-{\mathit{w}}_1}\right]$
${\mathit{w}}_1$ = weight of empty pycnometer
${\mathit{w}}_2$ = weight of pycnometer + soil sample (oven dried)
${\mathit{w}}_3$ = weight of pycnometer + soil solids + water
${\mathit{w}}_4$ = weight of pycnometer + water
water content (W) = $\left[\frac{{\mathit{w}}_2-{\mathit{w}}_1}{{\mathit{w}}_2-{\mathit{w}}_4}\left(\frac{\mathit{G}-1}{\mathit{G}}\right)-1\right]\times 100$