🌱 Materials Engineer Accreditation Exam Reviewer – Part 3 Soil Mechanics, Embankment, and Field Testing
📘 Topic Focus: Soil Mechanics, Embankment, and Field Testing
✍️ Total Questions: 25
🔍 Based on: DPWH Blue Book 2024 Edition
👷 Instructions: Choose the correct answer for each question. Do not scroll to the answer key at the bottom until you’ve completed all questions.
🧠 Knowledge Check – Soil and Embankment Testing
- Which test determines the liquid limit of soil?
A. Proctor test
B. Atterberg limits test
C. Plate load test
D. CBR test - What is the minimum required Relative Compaction for embankment materials in road projects?
A. 85%
B. 90%
C. 95%
D. 100% - The Proctor Test is used to determine:
A. Grain size
B. Shear strength
C. Optimum moisture content and max dry density
D. Plasticity - Which test determines soil bearing capacity in situ?
A. Plate load test
B. Hydrometer analysis
C. Liquid limit test
D. CBR test - CBR stands for:
A. California Bearing Ratio
B. Concrete Bending Ratio
C. Compaction Bearing Resistance
D. Clay Bearing Response - What is the recommended maximum lift thickness for soil layer compaction in embankments?
A. 100 mm
B. 150 mm
C. 200 mm
D. 300 mm - Which soil type is best for embankment construction?
A. Organic soil
B. Sandy clay
C. Peat
D. Silty clay with roots - The plasticity index (PI) is the difference between:
A. Liquid and plastic limit
B. Liquid and shrinkage limit
C. Plastic and shrinkage limit
D. Sand and silt content - Standard Proctor test hammer weight is:
A. 2.5 kg
B. 3.0 kg
C. 4.5 kg
D. 5.5 kg - What is the allowable CBR value for subgrade soil in national roads?
A. 5%
B. 10%
C. 15%
D. 20% - What tool measures in-situ soil density without excavation?
A. Core cutter
B. Sand cone
C. Nuclear density gauge
D. Oven-drying kit - The optimum moisture content (OMC) results in:
A. Max permeability
B. Max plasticity
C. Max dry density
D. Max liquid limit - What is the typical mold volume in Standard Proctor test?
A. 500 cc
B. 750 cc
C. 1000 cc
D. 944 cc - Which soil test is used to classify soil based on grain size?
A. Hydrometer
B. Sieve analysis
C. Plate load
D. Cone penetration - Which test provides information on swell and shrink behavior of soils?
A. Plate load
B. Hydrometer
C. Consolidation test
D. Ductility test - The degree of compaction is calculated by:
A. Lab density / field density
B. Max dry density / field dry density
C. Field dry density / lab max dry density × 100
D. None of the above - Which soil is considered non-cohesive?
A. Clay
B. Sand
C. Silty clay
D. Loam - Uncontrolled fill may result in:
A. Differential settlement
B. Improved bearing
C. Faster drainage
D. Lower construction cost - Before conducting a Proctor test, the soil must be:
A. Oven-dried
B. Compacted
C. Pulverized and sieved
D. Mixed with cement - The sand cone test measures:
A. Moisture content
B. Compaction effort
C. In-situ density
D. Shear strength - Maximum dry density is influenced by:
A. Grain size and shape
B. Water content
C. Compaction method
D. All of the above - Standard CBR test load plunger has a diameter of:
A. 25 mm
B. 30 mm
C. 50 mm
D. 75 mm - Clay soil has:
A. High permeability
B. High plasticity
C. Low cohesion
D. None of the above - Frost action in soil is dangerous because it causes:
A. Expansion
B. Shrinkage
C. Cracking
D. All of the above - Soil classified as A-1 by AASHTO is:
A. Good subgrade
B. Plastic
C. Silty
D. Organic
📋 Answer Key
1. B 2. C 3. C 4. A 5. A 6. B 7. B 8. A 9. A 10. B
11. C 12. C 13. D 14. B 15. C 16. C 17. B 18. A 19. C 20. C
21. D 22. B 23. D 24. D 25. A
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