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Revision Notes

Computer Fundamentals — Revision Notes

NIOS · Class 12 · Computer Science

Computer Fundamentals revision notes for NIOS Class 12 Computer Science: 4 topics in quick points. Part of the NIOS Class 12 Computer Science syllabus.

45 questions30 flashcards5 concepts

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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?
Key topics in Computer Fundamentals include Working of a Computer - The Four Basic Functions, Input Devices, Central Processing Unit (CPU), Output Devices. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Computer Fundamentals for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Computer Fundamentals. Revise definitions regularly and use flashcards for quick recall 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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All NIOS Class 12 Computer Science Revision Notes

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