The first generation of computer was based on

Correct option is C

The first generation of computers (1940–1956) used vacuum tubes for circuitry and magnetic drums for memory. These machines were large, power‑hungry, and generated a lot of heat, but they marked the beginning of electronic computing. Examples include ENIAC, UNIVAC, and EDSAC.

Important Key Points:

1. Vacuum tubes acted as electronic switches and amplifiers in first‑generation computers.
2. Programs and data were entered using punch cards and paper tape.
3. These computers used machine language (binary) for programming.

Knowledge Booster:

• VLSI Microprocessor: Used in the fourth generation (1971‑1980s) — enabled microcomputers and personal PCs.
• Integrated Circuit (IC): Introduced in the third generation (1964–1971), replacing transistors with compact chips.
• Transistor: Formed the basis of the second generation (1956–1964), offering faster processing and reduced heat compared to vacuum tubes.