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Computer Fundamentals

NIOS · Class 12 · Computer Science

Quick revision notes for Computer Fundamentals — NIOS Class 12 Computer Science. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Working of a Computer - The Four Basic Functions

  • A computer performs four basic functions: Input, Processing, Storage, and Output.
  • Input: Accepting data/information from the user through input devices like keyboard, mouse, scanner.
  • Processing: Performing arithmetic or logical operations on data using the CPU.
2

Input Devices

  • An input device is used to get data or instructions from the user and pass it to the CPU for processing.
  • Keyboard: Standard QWERTY keyboard with 104 keys — most common input device.
  • Mouse: Pointing device that controls cursor movement — called an electro-mechanical device.
3

Central Processing Unit (CPU)

  • CPU is called the 'Brain of the Computer' because it processes all instructions given to the computer.
  • In a microcomputer, the CPU is based on a single chip called the microprocessor.
  • CPU has three main components: Control Unit (CU), Arithmetic Logic Unit (ALU), and Memory Registers.
4

Output Devices

  • Output devices receive information from the CPU and present it to the user in desired form.
  • Monitor (Visual Display Unit/VDU): Displays data and information. Standard size: 24 lines × 80 characters. Output on monitor is called SOFT COPY.
  • CRT Monitor: Cathode Ray Tube — older, bulkier, consumes more electricity — rarely used today.

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Full Notes

Key Concepts

A computer is an electronic deviceInput devices are hardware components usedThe CPU is the 'BrainOutput devices display or communicate resultsPrimary memory is directly accessible by

Frequently Asked Questions

What are the important topics in Computer Fundamentals for NIOS Class 12 Computer Science?
Computer Fundamentals covers several key topics that are frequently asked in NIOS Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Computer Fundamentals — NIOS Class 12 Computer Science?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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