# If plasticity index and percentage of grain size finer than 2 micron m of a clay are 25 and 15 respectively, then the activity ratio is

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If plasticity index and percentage of grain size finer than 2 micron m of a clay are 25 and 15 respectively, then the activity ratio is
1. 1.67
2. 10.00
3. 5.00
4. 12.50
5. 7.50

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Correct Answer - Option 1 : 1.67

Concept:

Activity of the soil is defined as the ratio of plasticity index of the soil to the percentage of particles finner than 2μ or 0.002 mm.

${A_t} = \frac{{{I_P}}}{c}$

Ip = Plasticity index of the soil = w– wP

wL = Liquid limit of the soil

wP = Plastic limit of the soil

Calculation:

Ip = 25%

c = 15 %

${A_t} = \frac{{25}}{{15}} = 1.67$