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Q: The water content at which soil changes from a liquid state to a plastic state is known as :
  • A. Consistency limit
  • B. Plastic limit
  • C. liquid limit
  • D. Shrinkage limit
Correct Answer: Option C - Liquid Limit : Liquid limit is the boundary between the liquid state and plastic state. It is the minimum water content at which the soil is at liquid state or the maximum water content at which the soil is in plastic state. It is minimum water content at which the soil tends to flow. Plastic limit– It is the water content corresponding to an arbitrary limit between the plastic and the semi-solid state of consistency of soil. Shrinkage limit– It is defined as the maximum water content at which a reduction in water content will not cause a decrease in the volume of soil mass.
C. Liquid Limit : Liquid limit is the boundary between the liquid state and plastic state. It is the minimum water content at which the soil is at liquid state or the maximum water content at which the soil is in plastic state. It is minimum water content at which the soil tends to flow. Plastic limit– It is the water content corresponding to an arbitrary limit between the plastic and the semi-solid state of consistency of soil. Shrinkage limit– It is defined as the maximum water content at which a reduction in water content will not cause a decrease in the volume of soil mass.

Explanations:

Liquid Limit : Liquid limit is the boundary between the liquid state and plastic state. It is the minimum water content at which the soil is at liquid state or the maximum water content at which the soil is in plastic state. It is minimum water content at which the soil tends to flow. Plastic limit– It is the water content corresponding to an arbitrary limit between the plastic and the semi-solid state of consistency of soil. Shrinkage limit– It is defined as the maximum water content at which a reduction in water content will not cause a decrease in the volume of soil mass.