Q. In a consolidation test, what is the primary factor being measured?
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A.
Soil permeability
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B.
Volume change over time
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C.
Shear strength
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D.
Soil density
Solution
The consolidation test measures the volume change of soil over time under a constant load, which is critical for understanding settlement behavior.
Correct Answer:
B
— Volume change over time
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Q. What does the term 'effective stress' refer to in soil mechanics?
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A.
Total stress minus pore water pressure
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B.
Pore water pressure minus total stress
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C.
Soil weight divided by volume
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D.
Soil density multiplied by gravity
Solution
Effective stress is defined as the total stress acting on a soil mass minus the pore water pressure within the soil.
Correct Answer:
A
— Total stress minus pore water pressure
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Q. What is the primary factor affecting the shear strength of granular soils?
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A.
Pore water pressure
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B.
Soil density
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C.
Friction angle
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D.
Plasticity index
Solution
The friction angle is the primary factor affecting the shear strength of granular soils, as it relates to the inter-particle friction.
Correct Answer:
C
— Friction angle
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Q. What is the primary purpose of a site investigation?
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A.
To design the foundation
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B.
To assess soil contamination
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C.
To determine soil properties and conditions
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D.
To evaluate construction costs
Solution
The primary purpose of a site investigation is to determine the soil properties and conditions at a site to inform design and construction decisions.
Correct Answer:
C
— To determine soil properties and conditions
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Q. What is the significance of the coefficient of permeability in soil mechanics?
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A.
It indicates soil strength
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B.
It measures the rate of water flow through soil
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C.
It determines soil density
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D.
It assesses soil compaction
Solution
The coefficient of permeability quantifies the rate at which water can flow through soil, which is crucial for drainage and stability analysis.
Correct Answer:
B
— It measures the rate of water flow through soil
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Q. Which of the following is NOT a method of soil compaction?
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A.
Vibratory compaction
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B.
Static compaction
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C.
Dynamic compaction
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D.
Hydraulic compaction
Solution
Hydraulic compaction is not a recognized method of soil compaction; the other three methods are commonly used in practice.
Correct Answer:
D
— Hydraulic compaction
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Q. Which test is commonly used to determine the shear strength of cohesive soils?
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A.
Standard Proctor Test
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B.
Unconfined Compression Test
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C.
California Bearing Ratio Test
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D.
Consolidation Test
Solution
The Unconfined Compression Test is commonly used to determine the shear strength of cohesive soils without the need for confining pressure.
Correct Answer:
B
— Unconfined Compression Test
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