Question

Toughness Index gives a measure of Shear Strength of soil at ___

• A. Liquid Limit
• B. Plastic Limit
• C. Shrinkage Limit
• D. Dry State

Hint:

Toughness Index is useful for assessing the shear strength and consistency of cohesive soils, particularly when evaluating their plasticity.

Answer 1

The Correct Option is B

The Toughness Index is defined as the difference between the Plasticity Index and the Liquidity Index. It is used to measure the shear strength of the soil at the plastic limit, which is the state where the soil can still be molded but exhibits some resistance to flow. Hence, the correct answer is the Plastic Limit.