# Which of the following types of tests that are used to measure the shear strength of a soil is INCORRECT?

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Which of the following types of tests that are used to measure the shear strength of a soil is INCORRECT?
1. Direct shear test
2. Confined compression test
3. Shear vane test
4. Triaxial compression test

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Correct Answer - Option 2 : Confined compression test

Concept

Shear Tests of soil:

Most of the shear tests are done to determine the shear strength of soil on equipment that is strain-controlled.

 Type of test Type of Soil Type of Shear Strength that can be measured Direct shear Saturated sands Undrained shear strength because there is no mechanism to measure pore water pressure Triaxial shear All type of soils i.e. sand, clay, silt Both drained and undrained shear strength Vane shear Saturated clays Undrained shear strength because there is no mechanism to measure pore water pressure Unconfined compression Soft clays having zero angles of internal friction Both drained and undrained shear strength

Here,

It is mentioned as Confined Compression Test, which is wrong. It should be Unconfined Compression Test