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If a soil has PI of 50 and clay fraction of 10%, then it will be considered as — Answer & Solution | Civexa

Soil Mechanics · Index Properties

Index Properties MCQ with answer and solution

If a soil has PI of 50 and clay fraction of 10%, then it will be considered as

Solution

Concept

Activity

Formula

A = PI / (% clay)

Step-by-step solution

1. A = 50/10 = 5 > 1.25. 2. The soil is active.

Explanation

Activity above 1.25 is called active.

Why the other options are wrong

Inactive is below 0.75 and normal is 0.75–1.25.

Shortcut

A = PI ÷ clay%.

Correct answer: C) Active

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