Match the type of test (List 1) with the objective of the test (List 2). List 1: A — Standard penetration test, B — Hydrometer test, C — Proctor test, D — Vane test. List 2: 1 — Grain size analysis, 2 — Shear strength, 3 — Bearing capacity, 4 — Compaction.
Try it first: pick an option, then read the explanation.
Correct answer: B. A-3, B-1, C-4, D-2
Asked in SSC JE 25/09/2019 (Morning)
Detailed Explanation
Each common soil test answers one main question. Match each test to its purpose:
Why “A-3, B-1, C-4, D-2” Is Correct
SPT (A) gives the N value used to estimate bearing capacity (3). The hydrometer (B) gives the grain size distribution of silts and clays (1). The Proctor test (C) gives OMC and maximum dry density for compaction (4). The vane test (D) gives undrained shear strength (2). So A-3, B-1, C-4, D-2.
| Test | Main objective |
|---|---|
| Standard penetration test (SPT) | Bearing capacity / density of sands (N value) |
| Hydrometer test | Grain size analysis of fine soil (< 75 μm) |
| Proctor test | Compaction: OMC and maximum dry density |
| Vane shear test | Undrained shear strength of soft clay |
Why the Other Options Are Wrong
- A. A-3, B-1, C-2, D-4: Proctor (C) is a compaction test, not a shear strength test, and the vane (D) measures shear strength, not compaction.
- C. A-2, B-1, C-4, D-3: SPT is mainly used for bearing capacity, and the vane is a shear test, not a bearing capacity test.
- D. A-4, B-2, C-3, D-1: Hydrometer is grain-size analysis, Proctor is compaction, and vane is shear strength.
Key Point
SPT–bearing, Hydrometer–grain size, Proctor–compaction, Vane–shear.
Key Concepts for Students
- Sieve analysis covers coarse fraction; hydrometer covers fines.
- SPT N is corrected for overburden and dilatancy before use.
- Light and heavy Proctor tests use different compactive efforts.
Practice more: this is question 29 in Shear Strength of Soils MCQs – Part 2. Try the whole set and check every answer instantly.