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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-7 section-1

61
What is the Atterberg limit that defines the boundary between the plastic and liquid states of soil?
Discuss
Answer & Solution
Answer: Option C
Solution:
The liquid limit is the water content at which soil changes from a plastic to a liquid state.It is used in soil classification and consistency evaluation.
62
The degree of saturation (S) of soil is defined as:
Discuss
Answer & Solution
Answer: Option B
Solution:
Degree of saturation = (Volume of water / Volume of voids) � 100.It indicates how much of the void space is filled with water.
63
Which of the following soils has the least permeability?
Discuss
Answer & Solution
Answer: Option B
Solution:
Clay has very fine particles and tiny pores, which restrict water movement, making it least permeable.
64
What does the term "soil consistency" refer to?
Discuss
Answer & Solution
Answer: Option B
Solution:
Soil consistency is the resistance of soil to deformation or penetration at different moisture contents.It's measured using tools like the penetrometer.
65
Which index property defines the range of water content over which soil is plastic?
Discuss
Answer & Solution
Answer: Option C
Solution:
Plasticity index = Liquid limit - Plastic limit.It shows the range in which soil can deform plastically without cracking.
66
The permeability of soil depends on:
Discuss
Answer & Solution
Answer: Option D
Solution:
Permeability depends on particle size, temperature, void ratio, and degree of saturation.These factors affect water movement in soil.
67
Compaction and consolidation are different because:
Discuss
Answer & Solution
Answer: Option C
Solution:
Compaction expels air and is fast, while consolidation expels water under sustained load over time.
68
The main factor affecting the shrink-swell behavior of soil is:
Discuss
Answer & Solution
Answer: Option C
Solution:
Clay mineral type, especially expansive minerals like montmorillonite, governs shrink-swell potential in soils.
69
A well-graded soil is one that:
Discuss
Answer & Solution
Answer: Option C
Solution:
Well-graded soil contains a wide distribution of particle sizes, allowing better compaction and strength.
70
The hydrometer analysis is used to determine:
Discuss
Answer & Solution
Answer: Option C
Solution:
Hydrometer analysis is used for fine-grained soils to assess particle size below 0.075 mm using sedimentation principles.