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Soil Mechanics and Foundation Engineering - Engineering

Q1:

Pick up the correct statement from the following:

A The range of water content between the liquid limit and plastic limit, is called plasticity index.

B The ratio of the liquid limit minus the natural water content to the plasticity index of soils, is called consistency index

C The ratio of natural water content minus its plastic limit to its plasticity index is called liquidity index

D The ratio between plasticity index and flow index (i.e. slope of flow curve in case of liquid limit), is called toughness index

E All the above.

ANS:E - All the above.

  1. The plasticity index is indeed the range of water content between the liquid limit and plastic limit. It's a measure of the plasticity of soil.
  2. The statement about the consistency index is incorrect. The consistency index is not defined as the ratio mentioned. It's typically used in other contexts, but not in the way described here.
  3. The liquidity index is the correct term for the ratio of natural water content minus its plastic limit to its plasticity index. It helps classify soils based on their plasticity and liquidity characteristics.
  4. The statement about the toughness index is not accurate. The toughness index is not typically defined as the ratio between plasticity index and flow index. Toughness of soils is usually evaluated based on other criteria.