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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-6 section-1

Each section contains 100 MCQs on Rock Mechanics and Rock Engineering .
51
Which device is used to monitor rock displacement in tunnels?
Discuss
Answer & Solution
Answer: Option C
Solution:
An extensometer is a device used to measure displacement or deformation in rock, particularly in tunnel linings and rock masses.
52
What is the typical failure mode in unconfined brittle rock?
Discuss
Answer & Solution
Answer: Option C
Solution:
Brittle rocks under uniaxial stress fail by tensile fracturing, often showing sudden splitting or cracking.
53
Rock abrasivity affects which engineering process the most?
Discuss
Answer & Solution
Answer: Option B
Solution:
Rock abrasivity impacts tunnel boring machine (TBM) cutter wear significantly, increasing maintenance and operational costs.
54
The term �anisotropy� in rock mechanics refers to:
Discuss
Answer & Solution
Answer: Option B
Solution:
Anisotropy means the rock exhibits different mechanical behavior in different directions, often due to layering, foliation, or jointing.
55
The purpose of rock bolt installation is to:
Discuss
Answer & Solution
Answer: Option C
Solution:
Rock bolts are reinforcement elements used to anchor unstable rock blocks and improve mass stability in tunnels and slopes.
56
When is the Mohr circle tangent to the failure envelope?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Mohr circle touches the failure envelope at the point of failure, indicating the rock has reached its ultimate shear strength.
57
The strength of intact rock differs from rock mass due to:
Discuss
Answer & Solution
Answer: Option C
Solution:
Rock mass strength is usually lower than intact rock strength due to joints, faults, and discontinuities that affect stress transfer.
58
Which of the following improves tunnel stability in fractured rock?
Discuss
Answer & Solution
Answer: Option C
Solution:
Systematic support using bolts, shotcrete, and lining is essential to maintain stability in fractured rock tunnels.
59
What is the term for stress that remains in rock after removal of external load?
Discuss
Answer & Solution
Answer: Option C
Solution:
Residual stress is the internal stress that remains in a material (or rock) even after unloading. It can affect future behavior of slopes or tunnels.
60
Joint roughness affects:
Discuss
Answer & Solution
Answer: Option C
Solution:
Joint roughness contributes significantly to shear strength of rock joints. Rougher surfaces offer greater resistance to sliding.