The plastic limit of a soil is 20% and its liquid limit is 50%. If its flow index is 30%, find the value of the toughness index of the soil.
Correct Answer:
A. 1
Explanation:
To determine the toughness index, the plasticity index is first calculated by subtracting the 20% plastic limit from the 50% liquid limit, resulting in 30%. This plasticity index is then divided by the 30% flow index to find the final value. The result of 1 confirms that option A is the correct answer.
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