61. Which rock property is most important in evaluating tunneling conditions? A. Porosity B. Hardness C. RQD (Rock Quality Designation) D. Plasticity E. 3 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: RQD provides a measure of rock mass quality based on the percentage of solid core pieces longer than 10 cm.It helps assess stability during tunneling.
62. The consistency of soil can be determined by: A. Shear test B. Penetrometer test C. Casagrande test D. Consolidation test E. 2 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: Penetrometer tests evaluate soil consistency and strength by measuring resistance to penetration.It is widely used in field testing.
63. Which type of soil has the highest capillarity? A. Gravel B. Sand C. Silt D. Clay E. 3 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: Silt has the highest capillary rise due to its intermediate grain size and pore space structure.Capillarity is lower in coarser or finer soils.
64. The term "bulking of sand" refers to: A. Reduction in volume on wetting B. Increase in weight C. Increase in volume when dry D. Increase in volume due to moisture E. 4 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: Bulking is the temporary increase in sand volume when it is moist, due to water films around particles.Important in concrete mix design.
65. The modulus of subgrade reaction is primarily used in: A. Pavement design B. Earth dam analysis C. Tunnel stability D. Slope analysis E. 1 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: Modulus of subgrade reaction is used in pavement design to model the support provided by soil to structural layers above.
66. Which of the following best describes the permeability of clay? A. High B. Moderate C. Low D. Variable E. 3 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: Clay has low permeability due to its small pore spaces and high water retention.It restricts water flow compared to sand or gravel.
67. The degree of saturation is defined as the ratio of: A. Water content to total volume B. Volume of water to volume of voids C. Volume of solids to total volume D. Volume of voids to total volume E. 2 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: Degree of saturation = (Volume of water / Volume of voids) � 100%.It indicates how much of the soil's void space is filled with water.
68. In rock mechanics, the angle of repose is associated with: A. Porosity B. Fracture toughness C. Internal friction D. Weathering E. 3 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: The angle of repose is the steepest angle at which material remains stable without sliding.It reflects internal friction among particles.
69. Which type of foundation is preferred for loose sandy soils? A. Pile foundation B. Shallow footing C. Raft foundation D. Mat foundation E. 1 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: Pile foundations transfer loads to deeper, more stable soil or rock layers.They are effective in loose or weak soils.
70. The parameter most influenced by void ratio is: A. Permeability B. Shear strength C. Plasticity index D. Grain size E. 1 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option Solution: Void ratio directly affects how easily water flows through soil pores.Higher void ratios = higher permeability.
