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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-9 section-1

81
Which property is determined by a Proctor test?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Proctor test determines the optimum moisture content and maximum dry density of a soil for compaction.
82
In a consolidation test, the curve of void ratio vs. log pressure is used to determine:
Discuss
Answer & Solution
Answer: Option C
Solution:
The e-log P curve from a consolidation test gives information on compressibility and settlement characteristics of clayey soils.
83
The zone in a soil mass where the pore water pressure is zero is called the:
Discuss
Answer & Solution
Answer: Option B
Solution:
The phreatic line is the boundary in a seepage system where pore pressure is atmospheric (zero gauge pressure).
84
Which test is used to determine relative density of granular soils?
Discuss
Answer & Solution
Answer: Option D
Solution:
The vibratory table test is used to evaluate the relative density of coarse-grained soils like sand and gravel.
85
Capillary rise in soils is inversely proportional to:
Discuss
Answer & Solution
Answer: Option A
Solution:
Capillary rise is higher in soils with smaller pores.Thus, it is inversely proportional to pore size.
86
Which of the following statements is true for saturated soil?
Discuss
Answer & Solution
Answer: Option C
Solution:
Total stress = Effective stress + Pore water pressure.This relationship governs soil strength and settlement.
87
Which factor does NOT affect the shear strength of soil?
Discuss
Answer & Solution
Answer: Option D
Solution:
Soil color is a visual property and does not directly affect mechanical behavior like shear strength.
88
The plastic limit of a soil is:
Discuss
Answer & Solution
Answer: Option B
Solution:
The plastic limit is the lowest water content at which soil remains plastic.It's found by rolling soil threads until they crumble.
89
What does the term "consistency index" describe in soil mechanics?
Discuss
Answer & Solution
Answer: Option C
Solution:
Consistency index = (Liquid limit - Natural water content) / Plasticity index. It describes the soil's firmness at its current water content.
90
Which type of soil will experience the most settlement under long-term loading?
Discuss
Answer & Solution
Answer: Option D
Solution:
Clay has a low permeability and high compressibility. It undergoes significant settlement over time due to consolidation.