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Rock Mechanics and Rock Engineering MCQs Questions & Answers | Geological Engineering

Learn and practice multiple-choice questions (MCQs) with answers related to Rock Mechanics and Rock Engineering. These resources are available for Geological engineering students who wish to clear GATE exams, technical interviews, competitive examinations, and other entrance exams. The Rock Mechanics and Rock Engineering chapter is particularly important for students studying Geological engineering. Page-7 section-1

Each section contains 100 MCQs on Rock Mechanics and Rock Engineering .
61
The term �rockburst� refers to:
Discuss
Answer & Solution
Answer: Option B
Solution:
Rockburst is the sudden and violent failure of rock in underground excavations caused by high stress. It typically occurs in deep tunnels or mines where rock exceeds its strength limit.
62
What is the significance of Poisson�s ratio in rock mechanics?
Discuss
Answer & Solution
Answer: Option C
Solution:
Poisson�s ratio is the ratio of lateral strain to axial strain in a material. It is a measure of how rock deforms in directions perpendicular to applied stress.
63
Which method is commonly used to test tensile strength of rocks?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Brazilian test is an indirect method where a disc-shaped rock sample is loaded diametrically to induce tensile failure. It is widely used for estimating tensile strength of rock.
64
Which rock property affects wave velocity the most in seismic tests?
Discuss
Answer & Solution
Answer: Option B
Solution:
Porosity affects the density and elastic properties of rock, hence impacting seismic wave velocity. Higher porosity typically reduces wave speed.
65
Which rock type generally exhibits plastic deformation under high confining pressure?
Discuss
Answer & Solution
Answer: Option B
Solution:
Shale tends to behave plastically under high confining pressure due to its layered, fine-grained structure and low strength.
66
The term �RQD� is used to measure:
Discuss
Answer & Solution
Answer: Option C
Solution:
RQD (Rock Quality Designation) quantifies the degree of jointing/fracturing in rock core. Higher RQD indicates better rock mass quality, critical for tunnel and foundation design.
67
Which of the following increases with rock weathering?
Discuss
Answer & Solution
Answer: Option C
Solution:
As rocks weather, porosity increases due to breakdown of minerals and opening of microcracks. This reduces strength and stability.
68
A common rock support method in underground excavation is:
Discuss
Answer & Solution
Answer: Option C
Solution:
Grouting involves injecting materials like cement to fill fractures, strengthen the rock mass, and reduce permeability in underground works.
69
The rebound number in Schmidt hammer test gives an estimate of:
Discuss
Answer & Solution
Answer: Option B
Solution:
The Schmidt rebound hammer provides an indirect measure of uniaxial compressive strength (UCS) based on surface hardness.
70
What is the main purpose of using shotcrete in tunneling?
Discuss
Answer & Solution
Answer: Option C
Solution:
Shotcrete is sprayed concrete applied to rock surfaces in tunnels. It provides immediate support and prevents disintegration or collapse of weak rock.