UGC NET Questions (Paper – 1)

The Central Processing Unit is often called the brain of the computer because it executes program instructions and coordinates operations among hardware components. It includes an arithmetic logic unit for computations and a control unit for directing data flow. Without the CPU, software instructions cannot be processed into meaningful actions. Thus, the component described is the CPU.

Option A:
Option A, RAM, is primary memory that temporarily holds data and instructions but does not itself execute them. It works closely with the CPU but serves a different role.

Option B:
Option B is correct because textbooks consistently identify the CPU as the main unit responsible for carrying out arithmetic and logical operations and controlling other parts of the system.

Option C:
Option C, ROM, is non volatile memory used for storing firmware and does not actively process instructions at runtime.

Option D:
Option D, UPS, stands for uninterruptible power supply and provides backup power rather than performing any computational control.

The central processing unit is responsible for fetching instructions from memory, decoding them and coordinating their execution. It contains the control unit and arithmetic logic unit that perform logical and arithmetic operations. Because it directs the flow of data among components, it is metaphorically called the brain of the computer. Thus the description in the stem fits the CPU exactly.

Option A:
Option A, primary memory, temporarily stores programs and data but does not itself interpret or execute instructions. It serves as a workspace for the CPU rather than acting as the controlling organ. Hence it cannot be identified as the brain of the computer.

Option B:
Option B is correct because the CPU orchestrates all key operations inside the system. It interprets machine instructions, controls peripheral devices and performs calculations, making it central to the computer’s functioning. Without the CPU, other parts like memory and storage remain inactive hardware.

Option C:
Option C, the hard disk drive, is a secondary storage device that keeps data permanently but does not process it. While essential for long-term storage, it plays no direct role in instruction execution or control. Therefore it does not match the description given.

Option D:
Option D, the mouse, is only an input device used to provide user commands. It has no internal capability to execute instructions and cannot coordinate system resources, so it cannot be regarded as the computer’s brain.