Chapter 16 of 18
Revision Notes
Computer — Revision Notes
XAT · General Knowledge
Free Computer revision notes for XAT General Knowledge 2026 — key concepts, formulas, and definitions for quick revision.
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Revision Notes — Computer
Key concepts, formulas, and definitions from Computer for XAT General Knowledge preparation.
Key Topics to Revise
1
Computer Evolution and Generations
- Computer derived from 'Compute' meaning 'to calculate'
- Blaise Pascal developed first mechanical calculator 'Pascalene' (1642)
- Charles Babbage: 'Father of modern computer' (1833)
2
Computer Generations and Technologies
- First Generation (1940-52): Vacuum tubes, EDSAC, EDVAC, UNIVAC
- Second Generation (1952-64): Transistors, IBM-700 series
- Third Generation (1964-71): Integrated Circuits, IBM-360/370
3
Computer Types and Classification
- Micro Computer: Personal computers for individual use (PC)
- Mini Computer: 5-50 times more powerful than micro computers
- Mainframe Computer: Large systems supporting 100+ users simultaneously
4
Computer Architecture and Hardware
- Three main units: Input, Processing (CPU), Output
- CPU components: ALU, Control Unit, Registers
- Primary Memory: RAM (volatile), ROM (non-volatile)
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Key Concepts
A computer system comprises three fundamentalMemory systems operate in a hierarchicalFive distinct generationsProgramming languages evolved through generationsFive primary categories
Frequently Asked Questions
What topics are covered in Computer for XAT?
Computer is an important chapter in XAT General Knowledge. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Computer Evolution and Generations, Computer Generations and Technologies, Computer Types and Classification, Computer Architecture and Hardware.
How important is Computer for XAT?
Computer is a frequently tested chapter in XAT General Knowledge. Questions from this chapter appear regularly in previous year papers.
How to prepare Computer for XAT?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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