Which term describes the range of water contents over which soil exhibits plastic properties?

• A. Plasticity Index
• B. Liquid Limit
• C. Plastic Limit
• D. Bank Cubic Yards

Answer: (A)

Plasticity Index describes the width of the plastic range on the moisture scale. Soil shows plastic behavior between the plastic limit and the liquid limit, and the size of that range is the difference between these two limits: Plasticity Index = Liquid Limit − Plastic Limit. The Plastic Limit and Liquid Limit mark the ends of this range, while Bank Cubic Yards is unrelated. So the term that best describes the range of water contents over which soil exhibits plastic properties is the Plasticity Index.