Which one of the following devices is found in the system unit?

Question

BlackTom AI · Accepted Answer

Motherboard is a main printed circuit board housed inside the system unit, so the correct answer is c. Motherboard.

1. Relevant knowledge points and concepts
- System unit (also called the computer case or chassis) contains internal components that make the computer work: motherboard, CPU, RAM, power supply, storage drives, expansion cards, cooling systems, and internal connectors.
- Peripherals (input/output devices) like printers, mice, and monitors are typically external devices connected to the system unit via cables or wireless interfaces.

2. Step-by-step reasoning
- Identify what “found in the system unit” means: components physically located inside the computer case.
- Check each option against that definition:
  a. Printer — a peripheral device used to produce hard copies; it is external to the computer and sits outside the system unit.
  b. Mouse — an input peripheral held and moved by the user; it connects externally (USB, Bluetooth) and is not mounted inside the case.
  c. Motherboard — the central printed circuit board onto which the CPU, memory, and expansion cards mount; it is installed inside the system unit.
  d. Monitor — an output display device that sits outside the computer case and connects via video ports; it’s external.

3. Intermediate details and clarifications
- The motherboard provides sockets and slots for the CPU, RAM, and cards and contains internal connectors for drives and power; these functions require it to be inside the system unit.
- Although peripherals communicate with the computer, they are not “found in the system unit”; they connect to it.

4. Why the correct answer is correct
- The motherboard is by definition an internal component mounted inside the computer chassis, making it the only option among the four that is located in the system unit.

5. Why the other options are incorrect
- Printer, Mouse, Monitor: all are external peripherals; they operate outside the case and connect to the system unit rather than being housed within it.

Conclusion: The correct option is c. Motherboard, which matches the provided answer.

Which one of the following devices is found in the system unit?单项选择题

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