Which of the following tests is NOT performed in a laboratory setting?

The Vane Test is typically conducted in the field rather than in a laboratory setting. This test is specifically designed to measure the undrained shear strength of cohesive soils in situ. It involves inserting a vane apparatus into the ground and rotating it to measure the soil's resistance against shear. Since it assesses the in-place soil properties, it requires outdoor conditions to accurately reflect the natural environment surrounding the soil.

In contrast, the Direct Shear Test, Unconfined Compression Test, and Triaxial Test are all performed within a controlled laboratory environment. These tests involve taking soil samples, preparing them, and then subjecting them to various stresses to determine properties such as shear strength, compressibility, and total stress under controlled conditions. This differentiates them from the Vane Test, which is reliant on immediate field conditions for its results.