Objective symptoms are determined by:
Visual and tactile inspection.
Percussion.
Palpation.
All of the above.
Objective symptoms are determined by tests and observations performed by the clinician. These tests are as follows:

Visual and tactile inspection
Percussion
Palpation
Mobility and depressibility
Bite test
Radiograph
Electric pulp test
Thermal tests (hot and cold)
Anesthetic test
Test cavity