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Soil Mechanics MCQs Questions & Answers | Geological Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Soil Mechanics. These resources are available for Geological engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Soil Mechanics chapter is particularly important for students studying Geological engineering. Page-6 section-1

51
Liquidity index is a measure of:
Discuss
Answer & Solution
Answer: Option C
Solution:
Liquidity index (LI) shows how close a soil's moisture is to its liquid limit.LI = (Natural water content - Plastic limit) / (Liquid limit - Plastic limit).
52
Compaction improves soil by:
Discuss
Answer & Solution
Answer: Option D
Solution:
Compaction increases shear strength and stability by reducing air voids and densifying the soil mass.
53
Soil consolidation is due to:
Discuss
Answer & Solution
Answer: Option D
Solution:
Consolidation is the gradual decrease in volume of a saturated soil due to the expulsion of water from its pores under load.
54
What is the effect of organic matter on soil strength?
Discuss
Answer & Solution
Answer: Option C
Solution:
Organic matter interferes with soil structure and bonding, leading to reduced strength and load-bearing capacity.
55
What does a high void ratio indicate?
Discuss
Answer & Solution
Answer: Option C
Solution:
A high void ratio indicates that the soil is loose with more air and water spaces, reducing strength and stability.
56
Which property is measured in a Proctor test?
Discuss
Answer & Solution
Answer: Option C
Solution:
The Proctor test determines the maximum dry density and optimum moisture content for compaction of soils.
57
The angle of internal friction is most relevant to:
Discuss
Answer & Solution
Answer: Option C
Solution:
Angle of internal friction quantifies shear strength in cohesionless soils like sand due to interparticle friction.
58
Which factor affects soil permeability the most?
Discuss
Answer & Solution
Answer: Option C
Solution:
Particle size distribution greatly affects permeability: coarse soils (e.g., sand) allow water to pass quickly, fine soils (e.g., clay) restrict it.
59
Which instrument is used to determine the liquid limit of soil?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Casagrande apparatus is used to determine the liquid limit of soils through repeated blows in a standard cup until closure.
60
The shrinkage limit of soil is defined as the:
Discuss
Answer & Solution
Answer: Option A
Solution:
Shrinkage limit is the lowest moisture content at which a soil can be dried without further volume reduction.Below this, no more shrinkage occurs.