Question

If a soil has a plasticity index value of 10%, then the soil is classified as:

• A. Non Plastic
• B. Low Plastic
• C. Medium Plastic
• D. Highly Plastic

Hint:

For soil classification, always check $PI$ ranges:
- $PI < 7\%$: Non-plastic,
- $7\% \leq PI \leq 15\%$: Medium plasticity,
- $PI > 15\%$: High plasticity.

Answer 1

The Correct Option is C

The plasticity index ($PI$) classifies soil plasticity as:
$PI < 7\%$: Non-plastic or very low plasticity.
$7\% \leq PI \leq 15\%$: Medium plasticity.
$15\% < PI \leq 30\%$: High plasticity.
$PI > 30\%$: Very high plasticity.
Since the plasticity index is $10\%$, the soil falls in the range $7\% \leq PI \leq 15\%$, making it medium plastic.