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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-8 section-1

71
The moisture content at which soil begins to crumble when rolled into threads is:
Discuss
Answer & Solution
Answer: Option B
Solution:
Plastic limit is the lowest moisture content at which soil remains plastic and can be rolled into 3 mm threads without crumbling.
72
The effective stress in soil equals:
Discuss
Answer & Solution
Answer: Option C
Solution:
Effective stress = Total stress - Pore water pressure.It governs the strength and deformation behavior of soils.
73
Which parameter is NOT involved in calculating shear strength in the Mohr-Coulomb equation?
Discuss
Answer & Solution
Answer: Option D
Solution:
Permeability is not part of the Mohr-Coulomb equation: Shear strength = c + ?'tan?.
74
A soil sample has a porosity of 40%. What does this mean?
Discuss
Answer & Solution
Answer: Option B
Solution:
Porosity is the ratio of void volume to total volume.A porosity of 40% means 40% of the soil's volume is voids (air + water).
75
Quick condition or liquefaction occurs when:
Discuss
Answer & Solution
Answer: Option B
Solution:
Quick condition or liquefaction happens when pore pressure rises enough to equal or exceed total stress, causing soil to lose strength and behave like a fluid.
76
The term "specific gravity" of soil solids refers to:
Discuss
Answer & Solution
Answer: Option D
Solution:
Specific gravity is the ratio of the density of soil solids to the density of water.It is dimensionless and helps in calculating other soil properties.
77
The void ratio of a soil is the ratio of:
Discuss
Answer & Solution
Answer: Option C
Solution:
Void ratio = Volume of voids / Volume of solids.It influences soil strength, compressibility, and permeability.
78
Which of the following soils exhibits cohesion?
Discuss
Answer & Solution
Answer: Option C
Solution:
Clay particles are cohesive due to their electrochemical properties and fine particle size.Gravel and sand are cohesionless.
79
Which laboratory test is commonly used to determine the water content of soil?
Discuss
Answer & Solution
Answer: Option C
Solution:
The oven-drying method is the standard test for determining water content by drying soil at 105-110�C for 24 hours.
80
Which one is NOT an Atterberg limit?
Discuss
Answer & Solution
Answer: Option D
Solution:
Compaction limit is not a defined Atterberg limit.Only Liquid, Plastic, and Shrinkage limits are standard Atterberg limits used in soil consistency evaluation.