Correct option is C
Methods used for determination of water content.
→ Oven drying method (most accurate method)
→ pycnometer method (suitable for cohesionless soil)
→ Sand bath method (Rapid method)( not very accurate)
→ Torsion balance moisture meter method (drying & weighting done simultaneously)
→ calcium carbide method (take 5 – 7 minutes)(Field method)
→ Alcohol method (quick field method) (Not used for soil containing calcium or organic compound)
→ Radiation method (In an in -situ condition)
So, From above option pycnometer method is used for calculation water content.
