Correct Answer - Option 1 : It is a standard laboratory method for the particle size analysis of coarse-grained soils.
Concepts:
The pipette method is used for particle analysis of fine grained soils. For coarse grained soils, Sieve analysis is done.
Pipette method is based on principal of Sedimentation i.e. the difference in sedimentation speed between small and large soil particles.
In the pipette method a sample is pipetted at different times and different depths of the suspension of the sample in a measuring cylinder. Time and depth are determined applying the Law of Stokes. The pipetted suspension is condensed and dried and weighing determines the mass ratio of the pipetted fraction.
