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Encoding Schemes and Number System — Revision Notes

CBSE · Class 11 · Computer Science

Encoding Schemes and Number System revision notes for CBSE Class 11 Computer Science: 4 topics in quick points.

86 questions80 flashcards16 formulas & key relations5 concepts

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Key Topics to Revise

1

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?
Key topics in Encoding Schemes and Number System include Encoding Schemes, ASCII, ISCII, and Unicode Examples, Number Systems and Positional Value, Binary, Octal, and Hexadecimal Number Systems. Study these first, then practise questions on each for Class 11 exams.
How should I revise Encoding Schemes and Number System for Class 11 exams?
Learn the core ideas first, then work through the 86 practice questions on Encoding Schemes and Number System. 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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