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The toughness index (It) is defined by the ratio of __________

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The toughness index (It) is defined by the ratio of __________

(a) It=WP/IP

(b) It=IP/If

(c) It=IF/IP

(d) It=WL/If

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Asked question is from Determination of Liquid and Plastic Limit topic in division Index Properties Determination of Geotechnical Engineering I

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Right option is (b) It=IP/If

The explanation is: Toughness index (It) is determined by the ratio of plasticity index to the flow index: It=IP/If.

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