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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-4 section-2

Each section contains 100 MCQs on Rock Mechanics and Rock Engineering .
31
Which factor decreases rock strength over time under constant stress?
Discuss
Answer & Solution
Answer: Option C
Solution:
Creep is time-dependent deformation under sustained load, reducing rock strength and stability.
32
Which test is commonly used for field measurement of rock hardness?
Discuss
Answer & Solution
Answer: Option B
Solution:
The Schmidt hammer test estimates surface hardness and strength by measuring rebound of a spring-driven hammer.
33
Which term describes the volume of voids within a rock mass?
Discuss
Answer & Solution
Answer: Option A
Solution:
Porosity is the ratio of void volume to total volume in rock, affecting fluid flow and strength.
34
What is a key purpose of grout injection in rock engineering?
Discuss
Answer & Solution
Answer: Option B
Solution:
Grouting fills fractures and voids to reduce permeability and improve rock mass stability.
35
What is the typical range of unconfined compressive strength (UCS) for weak rocks?
Discuss
Answer & Solution
Answer: Option D
Solution:
Weak rocks usually have UCS less than 25 MPa, indicating low strength and high deformability.
36
Which rock discontinuity is characterized by a planar break with no visible displacement?
Discuss
Answer & Solution
Answer: Option B
Solution:
Joints are fractures with no displacement, affecting permeability and strength of rock masses.
37
What does the Rock Quality Designation (RQD) indicate?
Discuss
Answer & Solution
Answer: Option B
Solution:
RQD is a measure of rock mass quality, based on percentage of solid core pieces longer than 10 cm from a drill core.
38
The primary function of rock bolts in tunneling is to:
Discuss
Answer & Solution
Answer: Option B
Solution:
Rock bolts reinforce and stabilize rock masses by tying fractured blocks together, enhancing stability.
39
Which factor primarily influences the elastic modulus of rock?
Discuss
Answer & Solution
Answer: Option C
Solution:
Elastic modulus depends on rock porosity and presence of cracks, which reduce stiffness.
40
Which type of rock deformation occurs when rock returns to its original shape after stress removal?
Discuss
Answer & Solution
Answer: Option B
Solution:
Elastic deformation is reversible deformation where rock recovers its original shape after stress removal.