Which of the following is NOT a component of a CPU?

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RRB JE ECE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. Arithmetic Logic Unit (ALU)
  2. Hard Disk
  3. Cache Memory
  4. Control Unit (CU)

Answer (Detailed Solution Below)

Option 2 : Hard Disk
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The correct answer is Hard Disk.

Key Points

  • The Hard Disk is a storage device used to store data permanently.
    • A hard disk is a non-volatile storage device that stores data even when the computer is turned off.
    • It is primarily used to store operating systems, software applications, and user data.
    • Hard disks come in various sizes and storage capacities, ranging from a few gigabytes to several terabytes.
    • Unlike components of a CPU, such as the ALU, CU, and cache memory, the hard disk is not involved in the direct processing of data.
    • Hard disks are typically connected to the computer's motherboard via SATA or NVMe interfaces.

Additional Information

  • The Arithmetic Logic Unit (ALU) is a core component of the CPU responsible for performing arithmetic and logical operations.
  • The Control Unit (CU) directs the operation of the processor by telling the computer's memory, ALU, and input/output devices how to respond to the instructions that have been sent to the processor.
  • Cache Memory is a small-sized type of volatile computer memory that provides high-speed data access to the CPU and improves processing speed.
  • Unlike the hard disk, these components work together within the CPU to execute instructions and process data efficiently.
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