........... generation of computers started to use assembly language.

Question

Accepted Answer

The correct option is (2):
The **second generation** of computers (roughly 1959-1965) is correctly identified as the period when assembly language first came into prominence. This era saw the replacement of vacuum tubes with smaller, faster, and more reliable transistors. With this hardware advancement came a significant step forward in programming: the move from pure machine language (binary 0s and 1s) to symbolic or assembly language. Assembly language uses mnemonic codes—like ADD for addition and SUB for subtraction—to represent machine code instructions. This made programming much easier and faster for developers, as they no longer had to write in direct binary. An essential part of this transition was the development of the *Assembler*, a translator program that automatically converted the assembly mnemonics into the machine code that the computer could execute.

The incorrect option is (1):
The **first generation** of computers (roughly 1940-1956) relied exclusively on **machine language**, which is the lowest-level language and consists entirely of binary digits (0s and 1s). The primary technology of this era was the vacuum tube. Programming these massive, slow machines was incredibly tedious and error-prone, as instructions had to be written and entered directly in the machine's numerical code. The concept of using symbolic instruction codes like assembly language had not yet been fully realized or implemented for general use in this period. Therefore, the first generation is characterized by its reliance on pure machine code.

The incorrect option is (3):
The **third generation** of computers (roughly 1965-1971) was defined by the invention of the Integrated Circuit (IC). While assembly language was still used, the major language advancement of this era was the widespread adoption and standardization of **High-Level Languages (HLLs)** such as FORTRAN and COBOL. These languages allowed programmers to write programs using English-like statements, which were then translated by compilers or interpreters. This transition marked a move *beyond* assembly language as the primary programming method, focusing on efficiency and portability across different machine architectures.

The incorrect option is (4):
The **fourth generation** of computers (roughly 1971-Present) utilizes Very Large-Scale Integration (VLSI) technology, leading to the development of microprocessors. By this generation, high-level languages were dominant, and powerful operating systems were being developed for personal computers and networks. While assembly language remains a tool for specific tasks like embedded systems or optimization, it was not the language that *started* the revolution in symbolic programming. The programming landscape in the fourth generation was focused on advanced software, graphical user interfaces, and structured HLLs like C and C++, further distancing it from the initial move to assembly.