Q. In shear strength testing, what does the term 'cohesion' refer to?
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A.
The internal friction of soil
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B.
The resistance to sliding along a failure plane
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C.
The bonding between soil particles
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D.
The weight of the soil mass
Solution
Cohesion refers to the bonding between soil particles that contributes to the shear strength of the soil.
Correct Answer:
C
— The bonding between soil particles
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Q. What does the consolidation process in soil mechanics refer to?
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A.
The increase in soil volume due to compaction
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B.
The expulsion of water from soil under load
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C.
The change in soil structure over time
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D.
The reduction of soil strength due to saturation
Solution
Consolidation refers to the expulsion of water from soil under load, leading to a decrease in volume.
Correct Answer:
B
— The expulsion of water from soil under load
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Q. What does the term 'effective stress' in soil mechanics refer to?
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A.
Total stress minus pore water pressure
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B.
Total stress plus pore water pressure
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C.
Pore water pressure only
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D.
Soil weight per unit volume
Solution
Effective stress is defined as total stress minus pore water pressure, which is crucial for understanding soil behavior.
Correct Answer:
A
— Total stress minus pore water pressure
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Q. What is the primary function of a retaining wall?
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A.
To support vertical loads
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B.
To prevent soil erosion
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C.
To retain soil at an angle
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D.
To provide drainage
Solution
The primary function of a retaining wall is to retain soil at an angle, preventing it from collapsing.
Correct Answer:
C
— To retain soil at an angle
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Q. What is the significance of the plasticity index in soil classification?
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A.
It indicates the soil's drainage capacity
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B.
It measures the soil's compressibility
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C.
It reflects the range of moisture content where the soil behaves plastically
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D.
It determines the soil's shear strength
Solution
The plasticity index reflects the range of moisture content where the soil behaves plastically, indicating its plasticity characteristics.
Correct Answer:
C
— It reflects the range of moisture content where the soil behaves plastically
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Q. Which method is NOT typically used for site investigation?
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A.
Borehole drilling
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B.
Geophysical surveys
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C.
Soil sampling
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D.
Concrete testing
Solution
Concrete testing is not typically used for site investigation; it focuses on the properties of concrete rather than soil.
Correct Answer:
D
— Concrete testing
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Q. Which of the following is a common method for determining the shear strength of soil in the field?
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A.
Vane shear test
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B.
California bearing ratio test
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C.
Standard Proctor test
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D.
Cone penetration test
Solution
The vane shear test is a common method for determining the shear strength of cohesive soils in the field.
Correct Answer:
A
— Vane shear test
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Q. Which soil classification system is based on grain size distribution?
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A.
Unified Soil Classification System
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B.
AASHTO Soil Classification System
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C.
Atterberg Limits
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D.
Soil Compaction Test
Solution
The Unified Soil Classification System is based on grain size distribution and plasticity characteristics.
Correct Answer:
A
— Unified Soil Classification System
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Q. Which test is commonly used to determine the permeability of soil?
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A.
Proctor test
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B.
Oedometer test
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C.
Constant head test
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D.
Unconfined compression test
Solution
The constant head test is commonly used to determine the permeability of granular soils.
Correct Answer:
C
— Constant head test
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