Question 101 of 319

The device through which the main components of the computer communicate with each other is called?   

  • A.  keyboard
  • B.  memory
  • C. light pen
  • D. system bus

Correct Answer: D

Explanation
The correct option is D. system bus. Detailed Explanation
  1. Understanding the System Bus:
  2. The system bus is a critical component of a computer's architecture. It is a communication pathway that connects the main components of the computer, including the CPU (Central Processing Unit), memory (RAM), and input/output devices. The system bus allows these components to communicate with each other by transferring data, addresses, and control signals.
  3. Components of the System Bus:
  4. The system bus typically consists of three main parts:
    • Data Bus: This part carries the actual data being transferred between components. The width of the data bus (measured in bits) determines how much data can be transferred at once.
    • Address Bus: This part carries the addresses of the data (not the data itself) so that the CPU knows where to read or write data in memory.
    • Control Bus: This part carries control signals from the CPU to other components, indicating what operation is to be performed (e.g., read or write).
  5. Why the Other Options Are Incorrect:
  6. A. Keyboard: A keyboard is an input device that allows users to enter data into the computer. While it is essential for user interaction, it does not facilitate communication between the main components of the computer. Instead, it sends input data to the CPU, which then processes it.
  7. B. Memory: Memory (or RAM) is where data and instructions are stored temporarily while the computer is running. While it is a crucial component of the computer, it does not serve as a communication pathway. Instead, it relies on the system bus to communicate with the CPU and other components.
  8. C. Light Pen: A light pen is an input device used to interact with a display screen. Similar to the keyboard, it allows user input but does not play a role in the communication between the main components of the computer.
  9. Common Pitfalls:
  10. Students may confuse input devices (like keyboards and light pens) with components that facilitate internal communication. It's essential to understand the distinct roles of each component in a computer system.
  11. Another common mistake is to think of memory as the primary communication medium. While memory is vital for data storage, it relies on the system bus for communication with the CPU and other components.
Revision Summary
  • The system bus is the communication pathway connecting the CPU, memory, and I/O devices.
  • It consists of three parts: data bus, address bus, and control bus.
  • Input devices like keyboards and light pens do not facilitate internal communication.
  • Memory stores data but relies on the system bus for communication with other components.
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