Electronics Engineering (ELEX) Exam 2025 – 400 Free Practice Questions to Pass the Exam

A printed circuit board (PCB) primarily serves the function of connecting and supporting electronic components. It provides a physical structure for mounting components such as resistors, capacitors, integrated circuits, and connectors. The copper traces etched onto the PCB create conductive pathways that allow electrical signals to pass between these components, enabling them to work together as part of a larger circuit.

In addition to facilitating connectivity, a PCB also ensures a reliable mechanical support for the components, keeping them securely in place and aligned properly. Designing a PCB involves careful layout planning to minimize issues like signal interference and shorts while optimizing space and performance.

The other choices, while relevant in various contexts, do not accurately capture the primary function of a PCB. For instance, PCBs do not inherently store digital data—this role is typically filled by memory chips. While a PCB may provide pathways for power distribution within a circuit, its core purpose is not power provision but rather connectivity. Heat dissipation may occur through the design of PCBs, particularly with the use of heat sinks or specific materials, but managing heat is not the primary function of the PCB itself. Hence, the choice highlighting the connection and support of electronic components is the correct answer.