Of the following connectors, which is the most common connector type used for a PCs power supply and other hardware components located inside the computer case?
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Answer Description
While there is a variety of connectors for PCs, the pin (male) and socket (female) design of the Molex design has become recognized and very common for simplicity, reliability, and low cost.
Wikipedia
A Molex connector is a two-piece pin-and-socket interconnection which became an early electronic standard. Developed by Molex Connector Company in the late 1950s, the design features cylindrical spring-metal pins that fit into cylindrical spring-metal sockets, both held in a rectangular matrix in a nylon shell.
AMP (now TE Connectivity) introduced the Mate-n-Lok connector in October 1963, which was similar to Molex's patented design but not compatible. It featured improvements such as being keyed to prevent incorrect insertion. The Mate-n-Lok connector design led to several connector types that have become established for connecting power in desktop PCs because of their simplicity, reliability, flexibility, and low cost, and is more widely known as a "Molex connector" despite not being from the Molex company.
Molex_connector - Wikipedia, the free encyclopedia 