In which generation of computers operating system was used for the first time?

Correct Answer: 3rd Generation

The third generation of computers (1964–1971) is recognized as the first generation in which operating systems (OS) became widely used. During this period, computers were built using Integrated Circuits (ICs), making them smaller, faster, more reliable, and capable of running sophisticated operating systems.

An Operating System (OS) is system software that manages computer hardware and software resources. It acts as an interface between the user and the computer, allowing multiple programs to run efficiently and managing tasks such as memory, input/output devices, files, and the CPU.

Computer Generations and Operating Systems

• 1st Generation (1946–1959): Used vacuum tubes. Computers did not have operating systems. Programs were loaded and executed manually using punched cards and switches.
• 2nd Generation (1959–1964): Used transistors. Batch processing techniques began to appear, but operating systems were still primitive and not commonly used in the modern sense.
• 3rd Generation (1964–1971): Used Integrated Circuits (ICs). This generation introduced operating systems supporting multiprogramming, time-sharing, memory management, and efficient CPU scheduling. Therefore, this is considered the first generation in which operating systems were widely used.
• 4th Generation (1971–Present): Uses microprocessors. Modern operating systems such as MS-DOS, Windows, UNIX, Linux, macOS, Android, and iOS were developed and became widely available.

Key Point for Competitive Exams

• 1st Generation → No Operating System
• 2nd Generation → Early Batch Processing
• 3rd Generation → First Generation with Operating Systems (Correct Answer)
• 4th Generation → Advanced Modern Operating Systems