Which of the following machines are characterised by electronic tube circuitry, delay line, rotating or electrostatic memory.

The correct answer is: A. First generation

First generation computers were characterized by electronic tube circuitry, delay line, rotating or electrostatic memory. They were very large and expensive, and had very limited capabilities.

Second generation computers were characterized by transistorized circuitry, magnetic core memory, and batch processing. They were smaller and faster than first generation computers, and had more capabilities.

Third generation computers were characterized by integrated circuit circuitry, magnetic disk memory, and time-sharing. They were smaller, faster, and more powerful than second generation computers.

Fourth generation computers were characterized by microprocessor circuitry, semiconductor memory, and personal computers. They were smaller, faster, and more powerful than third generation computers, and were the first computers to be widely used by individuals.

Fifth generation computers are still in development, and are characterized by artificial intelligence, parallel processing, and superconductivity. They are expected to be much faster and more powerful than fourth generation computers, and will be able to perform tasks that are currently impossible for computers.