Chief component of first generation computer was                      ?

The correct answer is Vacuum Tubes and Valves because first-generation computing systems built in the 1940s and 1950s relied entirely on thermionic vacuum tubes to control electricity and perform calculations.

• Vacuum Tubes and Valves: This is the correct choice. Your original parameters had a truncated string ('Vacuum Tubes and'). First-generation computers like the ENIAC and UNIVAC used thousands of vacuum tubes. Because these tubes were large, generated immense heat, and broke down frequently, they required massive cooling infrastructure.


• Incorrect Options:
  
  
  
  • Transistors: This is incorrect. Transistors are the defining component of second-generation computers (late 1950s to mid-1960s). They replaced vacuum tubes because they were significantly smaller, faster, cheaper, and more energy-efficient.
  
  
  • Integrated Circuits: This is incorrect. Integrated Circuits (ICs) pioneered third-generation computing (mid-1960s to 1970s), combining hundreds of transistors onto a single silicon semiconductor chip.