Which generation computers used transistors for the first time?

The correct answer is Second because the hallmark technical breakthrough of second-generation computing was replacing massive vacuum tubes with solid-state transistors.

• Step 1 (Historical Timeline): Spanning roughly from the late 1950s to the mid-1960s, second-generation computers abandoned delicate, power-hungry vacuum tubes in favor of transistors invented at Bell Labs.


• Step 2 (Hardware Impact): Transistors allowed computers to shrink drastically in physical size while becoming significantly faster, more energy-efficient, cheaper to build, and far more reliable.


• Incorrect Options:
  
  
  
  • First is incorrect because first-generation computers relied entirely on glass vacuum tubes for circuitry and magnetic drums for memory.
  
  
  • Third is incorrect because third-generation computers transitioned to silicon Integrated Circuits (ICs), which condensed multiple transistors onto a single microchip.
  
  
  • Fourth is incorrect because fourth-generation computers are defined by Very Large Scale Integration (VLSI) microprocessors, which pack millions of transistors onto a single silicon chip.