The standard plasticity chart for the classification of a fine-grained soil is shown in the figure. As per the Indian standard soil classification system, X represents

inorganic clay with high plasticity

inorganic clay with medium plasticity

inorganic silt with medium plasticity

inorganic clay with high plasticity

inorganic silt with high compressibility

GATE 2025 Civil Engineering Q18 — Civil Engineering

GATE 2025Set 1Q18DIAGRAManswer keyexplanation soonmedium

Civil Engineering · Geotechnical Engineering - Soil Classification

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Figure from the original GATE 2025 paper. (IIT Roorkee archive)

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Recurring concept

Geotechnical Engineering - Soil Classification has appeared in GATE Civil Engineering 4 times across 4 years (2019, 2021, 2025, 2026).

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plasticity chartsoil classificationIS classificationgeotechnical