81. Which property is determined by a Proctor test? A. Soil bearing capacity B. Compaction characteristics C. Permeability D. Shear strength Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B Solution: The Proctor test determines the optimum moisture content and maximum dry density of a soil for compaction.
82. In a consolidation test, the curve of void ratio vs. log pressure is used to determine: A. Permeability B. Shear strength C. Compressibility D. Cohesion Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C Solution: The e-log P curve from a consolidation test gives information on compressibility and settlement characteristics of clayey soils.
83. The zone in a soil mass where the pore water pressure is zero is called the: A. Capillary zone B. Phreatic line C. Zone of saturation D. Perched water table Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B Solution: The phreatic line is the boundary in a seepage system where pore pressure is atmospheric (zero gauge pressure).
84. Which test is used to determine relative density of granular soils? A. Unconfined compression test B. Direct shear test C. Core cutter test D. Vibratory table test Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D Solution: The vibratory table test is used to evaluate the relative density of coarse-grained soils like sand and gravel.
85. Capillary rise in soils is inversely proportional to: A. Pore size B. Surface tension C. Soil density D. Moisture content Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A Solution: Capillary rise is higher in soils with smaller pores.Thus, it is inversely proportional to pore size.
86. Which of the following statements is true for saturated soil? A. Effective stress = Total stress B. Pore pressure = Effective stress C. Total stress = Effective stress + Pore pressure D. Total stress = Pore pressure - Effective stress Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C Solution: Total stress = Effective stress + Pore water pressure.This relationship governs soil strength and settlement.
87. Which factor does NOT affect the shear strength of soil? A. Cohesion B. Moisture content C. Compaction D. Color Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D Solution: Soil color is a visual property and does not directly affect mechanical behavior like shear strength.
88. The plastic limit of a soil is: A. Water content at which soil behaves as a liquid B. Water content at which soil crumbles when rolled C. Water content at shrinkage start D. Water content at complete dryness Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B Solution: The plastic limit is the lowest water content at which soil remains plastic.It's found by rolling soil threads until they crumble.
89. What does the term "consistency index" describe in soil mechanics? A. Degree of compaction B. Ratio of shear strength to moisture C. Relative consistency of soil D. Ratio of shrinkage to plasticity Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C Solution: Consistency index = (Liquid limit - Natural water content) / Plasticity index. It describes the soil's firmness at its current water content.
90. Which type of soil will experience the most settlement under long-term loading? A. Gravel B. Sand C. Silt D. Clay Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D Solution: Clay has a low permeability and high compressibility. It undergoes significant settlement over time due to consolidation.
