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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-4 section-1

31
The Atterberg limits are applicable only to:
Discuss
Answer & Solution
Answer: Option C
Solution:
Atterberg limits are relevant for fine-grained soils like silts and clays because they define changes in soil consistency with water content.They are not applicable to coarse-grained soils which don't exhibit plastic behavior.
32
What parameter is used to classify soil in the Unified Soil Classification System (USCS)?
Discuss
Answer & Solution
Answer: Option B
Solution:
The USCS uses grain size distribution and plasticity characteristics (via Atterberg limits) to classify soil as clay, silt, sand, etc.
33
The maximum dry density of soil is achieved at:
Discuss
Answer & Solution
Answer: Option C
Solution:
Optimum moisture content is the water content at which soil achieves its maximum dry density during compaction.
34
Which of the following is a cohesionless soil?
Discuss
Answer & Solution
Answer: Option D
Solution:
Sand is a cohesionless soil that relies on intergranular friction for stability, unlike clay which has cohesive forces.
35
The zero air void line represents:
Discuss
Answer & Solution
Answer: Option A
Solution:
The zero air void line on a compaction curve represents a condition of 100% saturation, with no air in the voids.
36
The relative density of a soil is used to describe:
Discuss
Answer & Solution
Answer: Option D
Solution:
Relative density indicates the compactness of granular (cohesionless) soils compared to their loosest and densest states.
37
Which property increases with an increase in compactive effort?
Discuss
Answer & Solution
Answer: Option C
Solution:
Dry density increases with greater compactive effort because particles are packed more closely together.
38
The coefficient of consolidation (Cv) is affected by:
Discuss
Answer & Solution
Answer: Option A
Solution:
Coefficient of consolidation (Cv) depends on the permeability and compressibility of the soil.It governs how fast consolidation occurs.
39
Which soil has the lowest permeability?
Discuss
Answer & Solution
Answer: Option B
Solution:
Clay has extremely small pore sizes, making its permeability the lowest among common soil types.
40
The volume change behavior of expansive soils is primarily due to:
Discuss
Answer & Solution
Answer: Option C
Solution:
Expansive soils swell and shrink due to the presence of clay minerals like montmorillonite that absorb water.