Engineering Properties of Rocks and Soils MCQs Questions & Answers

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Learn and practice multiple-choice questions (MCQs) with answers related to Engineering Properties of Rocks and Soils. These resources are available for Geological engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Engineering Properties of Rocks and Soils chapter is particularly important for students studying Geological engineering. Page-4 section-1

What does a high specific gravity of soil indicate?

A) High permeability B) High organic content C) High density of particles D) Low compaction E) 3

Discuss

Answer & Solution

Answer: Option

Solution:

Specific gravity is the ratio of particle density to water density.Higher values suggest mineral-rich, dense soil with good engineering strength.

What effect does water saturation have on soil shear strength?

A) Increases it B) No effect C) Decreases it D) Doubles it E) 3

Discuss

Answer & Solution

Answer: Option

Solution:

Water reduces effective stress and can eliminate friction between particles.This decreases shear strength, especially in clays and silts.

Which method improves soil by injecting cementitious materials?

A) Vibrocompaction B) Grouting C) Dynamic compaction D) Soil stabilization E) 2

Discuss

Answer & Solution

Answer: Option

Solution:

Grouting strengthens soils and rock masses by injecting cement or chemicals to fill voids and bind particles.Used in foundations and tunnel linings.

What is the purpose of permeability tests in soil mechanics?

A) To classify soil B) To determine load-bearing capacity C) To measure water flow capacity D) To calculate dry density E) 3

Discuss

Answer & Solution

Answer: Option

Solution:

Permeability tests assess how easily water can pass through soil.This is vital for drainage, slope stability, and groundwater studies.

What does the plasticity index (PI) represent?

A) Difference between shrinkage and liquid limits B) Soil permeability range C) Soil compaction ratio D) Range of water content where soil is plastic E) 4

Discuss

Answer & Solution

Answer: Option

Solution:

Plasticity index = Liquid Limit ? Plastic Limit.It shows the moisture range over which soil behaves plastically, useful for classifying fine-grained soils.

Which factor most affects the permeability of soil?

A) Grain shape B) Soil color C) Plasticity index D) pH value E) 1

Discuss

Answer & Solution

Answer: Option

Solution:

Grain shape directly influences how easily water flows between soil particles.Angular grains interlock and reduce flow, while rounded grains allow easier passage.

Rocks with interlocking mineral crystals typically have:

A) High porosity B) Low permeability C) High plasticity D) High water retention E) 2

Discuss

Answer & Solution

Answer: Option

Solution:

Low permeability occurs because interlocking textures leave few interconnected pores.This is common in igneous and metamorphic rocks.

The unconfined compressive strength test is most appropriate for:

A) Granular soils B) Cohesive soils C) Rock cores D) Sandy gravels E) 2

Discuss

Answer & Solution

Answer: Option

Solution:

Unconfined compressive strength (UCS) tests are ideal for cohesive soils like clay.These soils can stand without lateral support during testing.

What is the typical range of Poisson's ratio for most rocks?

A) 0.1-0.2 B) 0.2-0.4 C) 0.4-0.6 D) 0.6-0.8 E) 2

Discuss

Answer & Solution

Answer: Option

Solution:

Poisson's ratio is the ratio of lateral strain to axial strain.For rocks, it generally falls between 0.2 and 0.4, depending on mineralogy and porosity.

Soil with a high clay content tends to have:

A) Low plasticity B) High permeability C) High shrink-swell potential D) Low cohesion E) 3

Discuss

Answer & Solution

Answer: Option

Solution:

Clay soils are prone to shrink-swell behavior due to their fine particles and water absorption characteristics.This affects foundation stability.

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Engineering Properties of Rocks and Soils MCQs Questions & Answers | Geological Engineering