Match List I (Equipment) with List II (use) and select the correct answer using code given below the lists.List IList II(a) Hydrometer(i) Determination of shear parameter(b) Plate load test set up(ii) Determination of specific gravity(c) Pycnometer(iii) Determination of bearing capacity of soils(d) Direct shear test apparatus(iv) Grain size distribution tests for clays

The correct matching is (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i).The hydrometer measures the settling of fine particles in suspension and gives the grain size distribution of clays and silts (a-iv).The plate load test loads a steel plate at foundation level to find the bearing capacity and settlement of the soil (b-iii).The pycnometer, a glass jar with a conical cap, is used to find the specific gravity of soil solids (c-ii).The direct shear apparatus shears a sample along a fixed plane to give the shear parameters c and φ (d-i).The other options either swap the hydrometer and pycnometer or swap the plate load and direct shear tests.

Triaxial and Direct Shear Testing Questions and Answers

Q: Which one of the following is the appropriate tri-axial test to assess the immediate stability of an unloading problem, such as an excavation of clay slope ?

The appropriate test is the UU test.Immediate (short-term) stability of a clay excavation is governed by undrained conditions: the clay has no time to drain while it is being excavated. The unconsolidated undrained triaxial test gives the undrained shear strength for exactly that case, which is why it is used for end-of-construction analysis.The CD test gives drained parameters for long-term stability, and the CU test is used where the soil consolidates first and then fails quickly, as in rapid drawdown. 'Unconsolidated drained' is not a standard triaxial test.

Which one of the following is the appropriate tri-axial test to assess the immediate stability of an unloading problem, such as an excavation of clay slope ?

A.Unconsolidated drained tests
B.CU Test
C.UU Test
D.CD Test

Exam Year(s)

RSMSSB JE - 2025, RSMSSB - 2025,

Answer: C

The appropriate test is the UU test.

Immediate (short-term) stability of a clay excavation is governed by undrained conditions: the clay has no time to drain while it is being excavated. The unconsolidated undrained triaxial test gives the undrained shear strength for exactly that case, which is why it is used for end-of-construction analysis.

The CD test gives drained parameters for long-term stability, and the CU test is used where the soil consolidates first and then fails quickly, as in rapid drawdown. 'Unconsolidated drained' is not a standard triaxial test.

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Match List I (Equipment) with List II (use) and select the correct answer using code given below the lists.

List I	List II
(a) Hydrometer	(i) Determination of shear parameter
(b) Plate load test set up	(ii) Determination of specific gravity
(c) Pycnometer	(iii) Determination of bearing capacity of soils
(d) Direct shear test apparatus	(iv) Grain size distribution tests for clays

A.(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
B.(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
C.(a)-(iv), (b)-(i) , (c)-(ii), (d)-(iii)
D.(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Exam Year(s)

RSMSSB JE - 2025, RSMSSB - 2025,

Answer: A

The correct matching is (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i).

The hydrometer measures the settling of fine particles in suspension and gives the grain size distribution of clays and silts (a-iv).
The plate load test loads a steel plate at foundation level to find the bearing capacity and settlement of the soil (b-iii).
The pycnometer, a glass jar with a conical cap, is used to find the specific gravity of soil solids (c-ii).
The direct shear apparatus shears a sample along a fixed plane to give the shear parameters c and φ (d-i).

The other options either swap the hydrometer and pycnometer or swap the plate load and direct shear tests.

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Triaxial and Direct Shear Testing Questions and Answers

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