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Syllabus

Binary Logic — Syllabus

NIOS · Class 12 · Computer Science

What Binary Logic covers in NIOS Class 12 Computer Science: 4 topics, for the 2026-27 session. Part of the NIOS Class 12 Computer Science syllabus.

40 questions24 flashcards5 concepts

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4 Topics · NIOS Class 12 Computer Science · 2026-27

Topics in Binary Logic

1

2.1 Number Systems

  • A number system defines how numbers are represented using a specific set of digits and a base (radix).
  • Binary (Base 2): Uses only digits 0 and 1. This is what computers use internally.
  • Octal (Base 8): Uses digits 0 to 7. Useful for compact representation of binary numbers.
2

2.2 One's Complement and Two's Complement

  • Complement operations are used in computers to perform subtraction using addition circuits, saving hardware complexity.
  • One's Complement: Flip all bits — change every 0 to 1 and every 1 to 0.
  • Two's Complement: First find One's Complement, then add 1 to the LSB (rightmost bit).
3

2.3 Character Coding Systems – ASCII, ISCII and Unicode

  • Computers only understand numbers, so characters (letters, symbols, digits) are represented using numeric codes.
  • ASCII (American Standard Code for Information Interchange): A 7-bit code that can represent 128 characters (0–127). Extended ASCII uses 8 bits for 256 characters.
  • ASCII value of 'A' = 65, 'B' = 66, ... 'Z' = 90. Lowercase 'a' = 97, ... 'z' = 122.
4

2.4 Logic Gates

  • Logic gates are the elementary building blocks of digital circuits. They process binary inputs (0 or 1) to produce a binary output.
  • Most logic gates have TWO inputs and ONE output.
  • Basic gates: AND, OR, NOT. Derived gates: NAND, NOR. Special gates: XOR, XNOR.

Key Concepts

The binary number system uses onlyThe octal number system uses 8The hexadecimal number system uses 16Converting between number systems isOne's complement is obtained by inverting

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Frequently Asked Questions

What are the important topics in Binary Logic for NIOS Class 12 Computer Science?
Key topics in Binary Logic include 1 Number Systems, 2 One's Complement and Two's Complement, 3 Character Coding Systems – ASCII, ISCII and Unicode, 4 Logic Gates. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Binary Logic for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 40 practice questions on Binary Logic. 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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