31. Which factor decreases rock strength over time under constant stress?
32. Which test is commonly used for field measurement of rock hardness?
33. Which term describes the volume of voids within a rock mass?
34. What is a key purpose of grout injection in rock engineering?
35. What is the typical range of unconfined compressive strength (UCS) for weak rocks?
36. Which rock discontinuity is characterized by a planar break with no visible displacement?
37. What does the Rock Quality Designation (RQD) indicate?
38. The primary function of rock bolts in tunneling is to:
39. Which factor primarily influences the elastic modulus of rock?
40. Which type of rock deformation occurs when rock returns to its original shape after stress removal?
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