The third generation computers:

Question

Accepted Answer

The correct option is (4):
The Third Generation of computers, spanning roughly from 1964 to 1971, is fundamentally characterized by the monumental shift to using **Integrated Circuits (ICs)**, also known as microchips. The IC, invented by Jack Kilby and Robert Noyce, allowed thousands of components to be fabricated onto a single small silicon chip, replacing the bulky and separate transistors of the previous generation. This development dramatically reduced the physical size of computers, increased their speed and efficiency, and lowered their cost, making them accessible to a wider commercial audience.

The incorrect option is (1):
The use of **VLSI (Very Large-Scale Integration)** technology is the defining characteristic of the **Fourth Generation** of computers, which began around 1971. VLSI allowed for hundreds of thousands of components to be packed onto a single chip, leading to the invention of the microprocessor and the birth of the personal computer era. Therefore, VLSI came after the integrated circuit that marked the third generation.

The incorrect option is (2):
While error-detecting and error-correcting mechanisms became more advanced in the Third Generation due to improvements in hardware and operating systems, this is not the primary defining factor. Early computers also had rudimentary error checking. The key distinction between generations is based on the core electronic component technology used for the central processing unit and memory, which in this case is the IC, not a feature like built-in error detection.

The incorrect option is (3):
The transition from using **vacuum tubes** (First Generation) to using **transistors** as the primary electronic component is the defining feature of the **Second Generation** of computers (c. 1957–1963). Transistors offered superior speed, reliability, and produced less heat than vacuum tubes, but they were still discrete components. The Third Generation superseded transistors by integrating them into the compact ICs.