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Encoding Schemes and Number System

CBSE · Class 11 · Computer Science

Quick revision notes for Encoding Schemes and Number System — CBSE Class 11 Computer Science. Key concepts, formulas, and definitions for last-minute revision.

86 questions80 flashcards5 concepts

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Key Topics to Revise

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1. Encoding Schemes

  • A computer understands only binary digits 0 and 1.
  • When a key is pressed on the keyboard, it is internally mapped to a unique code and then converted to binary.
  • Encoding is the mechanism of converting data into an equivalent cipher using a specific code.
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2. ASCII, ISCII, and Unicode Examples

  • ASCII value of A is decimal 65 and 7-bit binary 1000001.
  • ASCII value of D is decimal 68 and 7-bit binary 1000100.
  • ASCII value of T is decimal 84 and 7-bit binary 1010100.
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3. Number Systems and Positional Value

  • A number system is a method to represent numbers.
  • The count of unique literals in a number system is called its radix or base.
  • Number systems are positional number systems because the value of each digit depends on its position.
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4. Binary, Octal, and Hexadecimal Number Systems

  • Binary number system is a base-2 system using digits 0 and 1.
  • Binary represents ON/high and OFF/low states of transistors in ICs.
  • Binary is directly understood by a computer.

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Full Notes

Key Concepts

Encoding is the mechanism of convertingASCII stands for American Standard CodeISCII stands for Indian Script CodeUNICODE is a standard developedThe decimal number system is

Frequently Asked Questions

What are the important topics in Encoding Schemes and Number System for CBSE Class 11 Computer Science?
Encoding Schemes and Number System covers several key topics that are frequently asked in CBSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Encoding Schemes and Number System — CBSE Class 11 Computer Science?
Understand the core concepts first, then work through the 86 practice questions available for this chapter. Revise formulas and 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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