True or False: Pressure sensors are used to tell when a robot is under stress.

• A. True
• B. False
• C. Not applicable
• D. Not sure

Answer: (B)

Pressure sensors measure pressure that is applied to a fluid or a surface, not the internal stress inside a material. Stress is an internal state of a structure—the forces per area within the robot's parts as they are loaded. To detect that kind of internal stress, you’d use strain gauges or other structural health sensors that measure deformation, which can be related to stress through material properties. A pressure sensor might tell you about contact forces at a joint or the pressure inside an actuator, but it doesn’t directly reveal the robot’s structural stress. So the statement is false.