Which of the following computer generations used vacuum tubes?

Correct option is D

The First Generation of computers used vacuum tubes as the primary technology for circuitry. These computers were large, consumed a lot of electricity, and produced significant heat. Examples of first-generation computers include the ENIAC and UNIVAC. The vacuum tubes acted as electronic switches but were unreliable and prone to frequent failures.
Important Key Points:
1. First Generation computers (1940–1956) used vacuum tubes for processing.
2. These computers were known for their large size, heat production, and high energy consumption.
Knowledge Booster:
· Second Generation: Computers in this generation used transistors instead of vacuum tubes, which made them smaller and more reliable.
· Third Generation: Integrated Circuits (ICs) replaced transistors, further reducing the size and increasing the efficiency of computers.
· Fourth Generation: Microprocessors became the defining technology, integrating thousands of ICs on a single chip.
· Fifth Generation: Focuses on artificial intelligence (AI) and advanced parallel processing, moving away from traditional hardware components like vacuum tubes and transistors.