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

Question

BlackTom AI · Accepted Answer

The system unit houses the computer’s internal hardware, so the motherboard is the correct device found inside it.

1. Relevant knowledge points and concepts
- System unit: the enclosure that contains the computer’s primary internal components (power supply, motherboard, CPU, memory, storage, expansion cards).
- Motherboard: the main printed circuit board that connects and allows communication between CPU, RAM, storage, and expansion cards; it contains sockets, slots, chipsets, and internal connectors.
- Peripherals (printer, mouse, monitor): external devices that connect to the system unit via ports/cables but are not located inside the system unit.

2. Step-by-step reasoning process
- Identify what “found in the system unit” means: inside the computer case, not external devices.
- Evaluate each option with that definition:
  a. Printer — external peripheral, sits outside the system unit and connects via USB/network.
  b. Mouse — external pointing device connected via USB/Bluetooth, not inside the case.
  c. Motherboard — core internal board mounted inside the system unit; everything else connects to it.
  d. Monitor — external display device, positioned outside the case and connected by cable.
- Conclude which option is internal: motherboard.

3. Intermediate steps / calculations
- No numerical calculations are required. The logical steps above show classification of internal vs external components.

4. Why the correct answer is correct
- The motherboard is physically installed inside the computer chassis (system unit) and is the primary internal component that all other internal parts attach to, so it is correctly identified as being “found in the system unit.”

5. Why the other options are incorrect
- Printer: external output device; located outside the case.
- Mouse: external input device; not housed in the system unit.
- Monitor: external display; sits outside and connects to the system unit.

6. Conclusion
- The correct answer 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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