GATE CE 2026 Set 2 — Question 21
Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.MCQ+1 / -0.33MediumPlasticity ChartSoil ClassificationGeotechnical Engineering
Geotechnical Engineering → Soil Classification → Plasticity Chart
Last updated
Question
Based on the Casagrande’s plasticity chart, plasticity index (in ) of inorganic clays having a liquid limit of , ranges between
Correct answer
(B) 14.6 and 28.8
Solution
According to Casagrande's plasticity chart, the boundaries for inorganic clays are defined by the A-line and the U-line:
Inorganic clays lie between the A-line and the U-line on the plasticity chart. Therefore, for a liquid limit of , the plasticity index () ranges between and .Hence, the correct option is (B).
1.A-line: This line separates inorganic clays from silts and organic soils. Its equation is given by:
For a liquid limit () of :2.U-line: This line represents the upper limit for any soil. Its equation is given by:
For a liquid limit () of :Inorganic clays lie between the A-line and the U-line on the plasticity chart. Therefore, for a liquid limit of , the plasticity index () ranges between and .Hence, the correct option is (B).
Continue learning with Success Tracker
A step still unclear? Work through it with support
Use Success Tracker to ask about the reasoning, then try another GATE CE question to check your understanding.
AI-powered practice· Unlimited practice on eligible plans
- PYQs with solutions
- Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
- Practice that adapts
- Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
- AI doubt support
- Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.
Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.
This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.
More questions on Soil Classification
2026 Set 1 Q18The name of a person in Column 1 is to be matched with the test mentioned in Column 2. | Column 1 |…2026 Set 2 Q22Information related to foundation design is provided in table below. | Column 1 | Column 2 | | :---…2026 Set 1 Q31For a liquid, the permeability of a sandy soil having a void ratio of was determined as…2026 Set 1 Q32To obtain undisturbed clay soil sample, an Area Ratio of needs to be achieved for a…2026 Set 2 Q33A fully saturated sandy soil deposit has water content 20 % and specific gravity 2.65. The critical…