**History of Computer for Class 4**

Question and Answers

**What is Abacus and What are its use?**

Abacus was the first mechanical calculator invented 5000 years ago by the Chinese. You could use it to count large numbers and do arithmetic calculations such as addition, subtraction, multiplication and division.

**What is a punched card?**

Punched cards were pieces of paper that were used to store data for calculating. The holes in them represented the information.

**When was Pascaline developed?**

A calculating machine invented by Blaise Pascal in 1647 is called the Pascaline or Pascal Adding Machine.

**Write notes on the following: **

**Mark I – **

It was the first electromechanical (mechanical device that can be operated by electricity) computer. It was invented by Howard H. Akien and built by IBM in 1944. The machine was very big and heavy.

**ENIAC – **

ENIAC is an acronym for electronic numerical integrator and computer. John Mauchly and J Presper Eckert invented it in 1946. This computer was the first electronic general purpose computer. It was a thousand times faster than a Mark I.

**UNIVAC- **

This is an acronym for universal automatic computer. It was the world’s first commercially available computer Designed by J. Presper Eckert and John Mauchly in 1951.