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Important Questions and Answers for Class 11 Computer Science Chapter 2 Encoding Schemes and Number System 2025-26

Q: 1. Which important questions should I focus on first from Class 11 Computer Science Chapter 2?

Start with high-weightage and frequently asked questions from the chapter. Focus on concepts like Binary to Decimal conversion, advantages of Unicode over ASCII, and difference between number systems. These often appear in exams. Practice short definitions, conversions, and application types for thorough preparation.

Q: 3. Where can I get important questions and answers for Encoding Schemes and Number System Class 11 as a PDF?

You can find Encoding Schemes and Number System Class 11 important questions PDF and solutions on educational platforms like Vedantu. These PDFs include exam-focused questions, detailed stepwise answers, and practice sets for offline study and revision before tests.

Q: 4. How should I practice for MCQ and diagram-based questions in Chapter 2?

Practice by solving MCQs on number system conversions and practicing diagrams such as encoding tables. Use these tips:Rehearse drawing conversion steps clearlyLabel diagrams and value pointsAttempt previous year’s sample MCQs

Q: 6. Are diagrams or formal definitions compulsory to score full marks in this chapter?

For topics like encoding tables or number conversions, including neat diagrams or formal definitions often earns more marks. Examiners look for organized steps, proper labelling, and clear definitions. Always draw diagrams when questions mention ‘explain with example’ or ‘show conversion’.

Q: 7. Do I get partial marks for correct steps if the final answer is wrong in number system questions?

Yes, CBSE step marking awards partial marks for showing correct intermediate steps, even if the final answer is wrong. Always write down all calculation steps in conversion or encoding problems to secure marks for your method.

Encoding Schemes and Number System Class 11 Questions and Answers for CBSE Practice

Important Questions Class 11 Computer Science Chapter 2 Encoding Schemes and Number System covers all key topics needed for exam success. You will also find Vedantu’s Important Questions with Answers to help you prepare confidently.

This chapter explains how data is represented using encoding schemes and number systems. With Encoding Schemes and number system Class 11 questions and answers, you can solve MCQs, short, and long questions that match CBSE patterns.

Click here to download the Important Questions PDF for free and start your preparation now.

1. Multiple choice questions.

Q1. Which of the following encoding schemes can represent characters from almost all languages of the world?

(a) ASCII
(b) ISCII
(c) UNICODE
(d) EBCDIC

Answer: (c) UNICODE

Q2. What is the base value of the hexadecimal number system?

(a) 2
(b) 8
(c) 10
(d) 16

Answer: (d) 16

Q3. Which code value is assigned to the character 'A' in the ASCII encoding scheme?

(a) 65
(b) 97
(c) 48
(d) 32

Answer: (a) 65

Q4. Which number system is also known as the base-2 system?

(a) Decimal
(b) Octal
(c) Binary
(d) Hexadecimal

Answer: (c) Binary

2. Very Short Answer (VSA).

Q1. What is encoding?

Answer: Encoding is the process of converting data, such as text or symbols, into a coded format using a specific set of rules or codes that a computer can understand and process.

Q2. Name the four number systems commonly used in computers.

Answer: The four number systems are Decimal, Binary, Octal, and Hexadecimal.

Q3. Which encoding scheme is the superset of ASCII?

Answer: Unicode is the superset of ASCII encoding scheme.

Q4. Write the binary equivalent of decimal number 5.

Answer: The binary equivalent of decimal number 5 is 101.

3. Short Answer Questions.

Q1. Differentiate between ASCII and ISCII encoding schemes.

Answer: ASCII is a 7-bit encoding system used primarily for English characters, supporting 128 unique symbols. ISCII, on the other hand, is an 8-bit encoding scheme designed for Indian languages, retaining all ASCII codes and using additional codes for Indian scripts, enabling wider linguistic support.

Q2. Why is hexadecimal number system preferred for representing memory addresses?

Answer: Memory addresses are often large binary values. Representing them in hexadecimal shortens the length, making them easier to read, write, and recall. Hexadecimal groups binary digits in sets of four, allowing for compact and human-friendly address representation in programming and digital systems.

Q3. List any two advantages of Unicode over ASCII.

Answer: Unicode can represent characters from almost all languages globally, whereas ASCII is limited to English. Unicode also ensures consistent encoding across different platforms and devices, enabling seamless data sharing irrespective of language or operating system.

4. Long Answer Questions.

Q1. Explain how a decimal number is converted to its binary equivalent. Illustrate with an example for decimal number 13.

Answer: To convert a decimal number to its binary form, divide the number by 2 repeatedly, gathering the remainders. The binary equivalent is formed by reading the remainders from bottom to top. For the decimal number 13, the process is as follows:

Divide 13 by 2: quotient = 6, remainder = 1
Divide 6 by 2: quotient = 3, remainder = 0
Divide 3 by 2: quotient = 1, remainder = 1
Divide 1 by 2: quotient = 0, remainder = 1

Binary Equivalent: Reading remainders from last to first, we get 1101.

Q2. Discuss the applications of hexadecimal numbers in computers and digital systems.

Answer: Hexadecimal numbers are widely used for representing large binary values in a compact form, especially for memory addresses, due to their grouping capability. They are also prominent in color coding for digital images and web pages, simplifying color definition using values like (FF,00,00) for red in RGB format.

Simplifies memory address representation
Used for web and digital color codes
Efficient notation in programming and debugging

4. True or False Questions.

Q1. Unicode can encode all characters of almost all languages of the world.

Answer: True

Q2. Hexadecimal number system uses 8 unique digits (0–7).

Answer: False

Q3. ASCII value for lowercase ‘a’ is 97.

Answer: True

Q4. The binary number system is also called the base-10 system.

Answer: False

5. Match the Following Questions.

Q1. Match the following.

Questions	Answer
1. ASCII	(A) 7-bit English encoding
2. Hexadecimal	(B) Base 16 number system
3. ISCII	(C) Indian scripts encoding
4. Octal	(D) Base 8 number system
5. Unicode	(E) Universal character encoding

Answer: 1 - A, 2 - B, 3 - C, 4 - D, 5 - E

Why Learning Encoding Schemes and Number System Matters

Strengthen your basics with Encoding Schemes and number system Class 11 PDF and know how computers process data. Understanding binary, octal, and hexadecimal will build confidence for any computer science exam or Class 11 Computer Science Chapter 2 question answer PDF.

Each solution is easy to follow, helping you prepare well for your CBSE 2025-26 school exams and class assessments. Download Encoding Schemes and number system Class 11 questions and answers in PDF for structured practice.

FAQs on Important Questions and Answers for Class 11 Computer Science Chapter 2 Encoding Schemes and Number System 2025-26

1. Which important questions should I focus on first from Class 11 Computer Science Chapter 2?

Start with high-weightage and frequently asked questions from the chapter. Focus on concepts like Binary to Decimal conversion, advantages of Unicode over ASCII, and difference between number systems. These often appear in exams. Practice short definitions, conversions, and application types for thorough preparation.

2. How can I structure long answers to suit CBSE step marking in Encoding Schemes and Number System?

For long answers, organize your response using clear steps and headings to match marking schemes. Recommended structure:

Introduction with definition or explanation
Core concept with examples/steps
Relevant diagram or table if needed
Conclusion with key points

3. Where can I get important questions and answers for Encoding Schemes and Number System Class 11 as a PDF?

You can find Encoding Schemes and Number System Class 11 important questions PDF and solutions on educational platforms like Vedantu. These PDFs include exam-focused questions, detailed stepwise answers, and practice sets for offline study and revision before tests.

4. How should I practice for MCQ and diagram-based questions in Chapter 2?

Practice by solving MCQs on number system conversions and practicing diagrams such as encoding tables. Use these tips:

Rehearse drawing conversion steps clearly
Label diagrams and value points
Attempt previous year’s sample MCQs

5. Which subtopics from Encoding Schemes and Number System have the highest exam weightage?

Binary conversion, types of number systems, and ASCII/Unicode encoding schemes usually have the most questions. Prioritize these for revision as they are often tested in both short and long answer formats, sometimes with diagrams or conversion tables.

6. Are diagrams or formal definitions compulsory to score full marks in this chapter?

For topics like encoding tables or number conversions, including neat diagrams or formal definitions often earns more marks. Examiners look for organized steps, proper labelling, and clear definitions. Always draw diagrams when questions mention ‘explain with example’ or ‘show conversion’.

7. Do I get partial marks for correct steps if the final answer is wrong in number system questions?

Yes, CBSE step marking awards partial marks for showing correct intermediate steps, even if the final answer is wrong. Always write down all calculation steps in conversion or encoding problems to secure marks for your method.