Q. In soil mechanics, what does the term 'effective stress' 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 factor affecting the consolidation rate of saturated clay?
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A.
Soil density
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B.
Pore water pressure
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C.
Permeability
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D.
Soil plasticity
Solution
The primary factor affecting the consolidation rate of saturated clay is its permeability, which controls the rate of water expulsion.
Correct Answer:
C
— Permeability
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Q. What is the purpose of a site investigation?
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A.
To assess the environmental impact
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B.
To determine soil properties and conditions
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C.
To design the foundation
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D.
To evaluate construction methods
Solution
The purpose of a site investigation is to determine soil properties and conditions to inform design and construction.
Correct Answer:
B
— To determine soil properties and conditions
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Q. Which of the following is a common method for soil compaction?
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A.
Vibratory roller
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B.
Cone penetrometer
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C.
Sieve analysis
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D.
Oedometer test
Solution
A vibratory roller is a common method used for soil compaction, enhancing the density and stability of the soil.
Correct Answer:
A
— Vibratory roller
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Q. Which of the following is NOT a method for determining the shear strength of soil?
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A.
Direct shear test
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B.
Triaxial test
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C.
Unconfined compression test
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D.
Standard Proctor test
Solution
The Standard Proctor test is used to determine the optimum moisture content and maximum dry density of soil, not shear strength.
Correct Answer:
D
— Standard Proctor test
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