Operating System, Boolean Logic, Number System & Encoding Schemes MCQs | 100 Practice Questions with Answers | CBSE Class 11 Computer Science
Class 11 · Computer Science
Operating System, Boolean Logic, Number System & Encoding Schemes MCQs (100 Questions)
Practice these multiple-choice questions to strengthen your understanding of Operating Systems, Boolean Logic, Number Systems, and Encoding Schemes. Click Show Answer to reveal the correct answer and explanation.
Q1. What is an Operating System (OS)?
A. A programming language.
B. System software that manages computer hardware and software resources.
C. A web browser.
D. An application software.
Show Answer
Answer: B. System software that manages computer hardware and software resources.
Explanation: An operating system acts as an interface between the user and the computer hardware, managing resources and providing services to application programs.
Q2. Which of the following is the primary function of an Operating System?
A. Managing memory.
B. Managing files.
C. Managing input/output devices.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: An operating system manages memory, files, processes, devices, and provides a platform for running application software.
Q3. Which of the following is an example of an Operating System?
A. Ubuntu
B. Windows 11
C. macOS
D. All of these
Show Answer
Answer: D. All of these.
Explanation: Ubuntu, Windows, and macOS are widely used operating systems.
Q4. Which function of an Operating System manages files and folders?
A. File Management
B. Memory Management
C. Process Management
D. Security Management
Show Answer
Answer: A. File Management
Explanation: The operating system organizes files and directories, allowing users to create, copy, move, rename, and delete them.
Q5. Which function of an Operating System allocates and deallocates memory to programs?
A. Device Management
B. Process Management
C. Memory Management
D. User Management
Show Answer
Answer: C. Memory Management
Explanation: Memory management allocates memory to running programs and releases it after execution.
Q6. Which Operating System function controls printers, keyboards, scanners, and other hardware devices?
A. File Management
B. Device Management
C. Memory Management
D. User Interface
Show Answer
Answer: B. Device Management
Explanation: Device management controls communication between the operating system and hardware devices.
Q7. Which user interface allows users to interact with the operating system using commands typed from the keyboard?
A. GUI (Graphical User Interface)
B. CLI (Command Line Interface)
C. Touch Interface
D. Voice Interface
Show Answer
Answer: B. CLI (Command Line Interface)
Explanation: In a Command Line Interface (CLI), users type commands to perform tasks.
Q8. Which user interface uses windows, icons, menus, and pointers?
A. CLI
B. GUI
C. Batch Interface
D. Text Interface
Show Answer
Answer: B. GUI
Explanation: A Graphical User Interface (GUI) allows users to interact using graphical elements like icons, menus, and windows.
Q9. Which of the following is an advantage of a GUI over a CLI?
A. Easier to learn and use.
B. User-friendly interface.
C. Uses graphical elements instead of commands.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: GUI is easier for beginners because users can interact using graphical components instead of memorizing commands.
Q10. Which statement about Operating Systems is correct?
A. They manage computer resources.
B. They provide an interface between users and hardware.
C. They manage files, memory, and devices.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: Operating systems manage all major computer resources and provide an environment for users and applications.
Operating System MCQs (Part 2: Functions & User Interface)
Q11. Which function of an Operating System is responsible for scheduling and executing programs?
A. File Management
B. Memory Management
C. Process Management
D. Device Management
Show Answer
Answer: C. Process Management
Explanation: Process management schedules CPU time, creates and terminates processes, and enables multitasking.
Q12. Which Operating System function helps protect the computer from unauthorized access?
A. Security Management
B. File Management
C. Device Management
D. Memory Management
Show Answer
Answer: A. Security Management
Explanation: Security management provides user authentication, passwords, permissions, and access control.
Q13. Which of the following is a characteristic of a Command Line Interface (CLI)?
A. Uses icons and menus.
B. Requires users to type commands.
C. Uses only a mouse.
D. Does not require commands.
Show Answer
Answer: B.
Explanation: In a CLI, users interact with the operating system by typing commands.
Q14. Which interface is generally easier for beginners?
A. CLI
B. GUI
C. DOS Interface
D. Terminal Interface
Show Answer
Answer: B. GUI
Explanation: GUI provides icons, menus, buttons, and windows, making it easier to learn and use.
Q15. Which of the following is an advantage of CLI over GUI?
A. More attractive graphics.
B. Requires less memory and system resources.
C. Easier for beginners.
D. Uses icons instead of commands.
Show Answer
Answer: B.
Explanation: CLI generally consumes fewer system resources than GUI and is preferred by experienced users for many administrative tasks.
Q16. Which of the following is an example of a CLI-based operating environment?
A. MS-DOS
B. Windows 11 Desktop
C. Android Home Screen
D. macOS Finder
Show Answer
Answer: A. MS-DOS
Explanation: MS-DOS primarily uses a command-line interface.
Q17. Which of the following is an example of a GUI-based operating system?
A. Windows 11
B. Ubuntu Desktop
C. macOS
D. All of these
Show Answer
Answer: D. All of these.
Explanation: Windows, Ubuntu Desktop, and macOS provide graphical user interfaces.
Q18. Which of the following is NOT a function of an Operating System?
A. Memory Management
B. Device Management
C. Program Translation into Machine Code
D. File Management
Show Answer
Answer: C.
Explanation: Translating source code into machine code is the job of language translators such as compilers and interpreters, not the operating system.
Q19. Which statement correctly compares GUI and CLI?
A. GUI uses graphics, whereas CLI uses text commands.
B. GUI is generally easier for beginners.
C. CLI usually requires less memory than GUI.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: GUI and CLI differ in interaction style, ease of use, and resource requirements.
Q20. Which of the following is managed by an Operating System?
A. Memory
B. Files and folders
C. Input/Output devices
D. All of these
Show Answer
Answer: D. All of these.
Explanation: An operating system manages hardware resources, memory, files, processes, and peripheral devices.
Q21. Which of the following is responsible for allocating CPU time to different processes?
A. Device Management
B. Process Management
C. File Management
D. Security Management
Show Answer
Answer: B. Process Management
Explanation: Process management schedules processes and allocates CPU time efficiently.
Q22. Which feature of an Operating System helps users organize files into folders?
A. Memory Management
B. File Management
C. Device Management
D. User Authentication
Show Answer
Answer: B. File Management
Explanation: File management enables users to create, organize, rename, move, copy, and delete files and folders.
Q23. Which of the following interfaces relies mainly on icons, windows, and menus?
A. Command Line Interface (CLI)
B. Graphical User Interface (GUI)
C. Text Interface
D. Batch Interface
Show Answer
Answer: B. Graphical User Interface (GUI)
Explanation: GUI uses graphical components such as icons, windows, menus, and pointers to simplify interaction.
Q24. Which of the following statements is TRUE?
A. GUI always consumes fewer resources than CLI.
B. CLI is generally easier for beginners than GUI.
C. GUI provides a visual environment for user interaction.
D. CLI uses icons instead of typed commands.
Show Answer
Answer: C.
Explanation: GUI offers a visual interface using windows, icons, menus, and pointers, making interaction more intuitive.
Q25. Which statement best summarizes the role of an Operating System?
A. It acts as an interface between the user and computer hardware.
B. It manages files, memory, devices, and processes.
C. It provides a platform for running application software.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: An Operating System is the core system software responsible for managing computer resources and enabling users and applications to interact with the hardware efficiently.
Boolean Logic MCQs (Part 3: Logic Gates, Truth Tables & De Morgan's Laws)
Q26. Which logic gate produces the output 1 only when both inputs are 1?
A. OR Gate
B. AND Gate
C. XOR Gate
D. NOT Gate
Show Answer
Answer: B. AND Gate
Explanation: The AND gate produces an output of 1 only when both input values are 1.
Q27. Which logic gate produces the output 1 if at least one input is 1?
A. AND Gate
B. OR Gate
C. NAND Gate
D. NOR Gate
Show Answer
Answer: B. OR Gate
Explanation: The OR gate gives an output of 1 whenever one or both inputs are 1.
Q28. Which logic gate has only one input?
A. AND Gate
B. OR Gate
C. XOR Gate
D. NOT Gate
Show Answer
Answer: D. NOT Gate
Explanation: The NOT gate inverts a single input and is therefore a unary gate.
Q29. If the input to a NOT gate is 0, the output will be:
A. 0
B. 1
C. 00
D. Undefined
Show Answer
Answer: B. 1
Explanation: A NOT gate always produces the complement of its input.
Q30. Which gate is the complement of the AND gate?
A. NOR Gate
B. XOR Gate
C. NAND Gate
D. OR Gate
Show Answer
Answer: C. NAND Gate
Explanation: A NAND gate is an AND gate followed by a NOT gate.
Q31. Which gate is the complement of the OR gate?
A. XOR Gate
B. NAND Gate
C. NOR Gate
D. AND Gate
Show Answer
Answer: C. NOR Gate
Explanation: A NOR gate is an OR gate followed by a NOT gate.
Q32. Which logic gate produces the output 1 only when the two inputs are different?
A. AND Gate
B. OR Gate
C. XOR Gate
D. NAND Gate
Show Answer
Answer: C. XOR Gate
Explanation: An XOR gate outputs 1 only when exactly one of the two inputs is 1.
Q33. What will be the output of an AND gate for inputs A = 1 and B = 0?
A. 1
B. 0
C. Undefined
D. Depends on the circuit
Show Answer
Answer: B. 0
Explanation: An AND gate produces 1 only when both inputs are 1.
Q34. What will be the output of an OR gate for inputs A = 0 and B = 1?
A. 0
B. 1
C. Undefined
D. 10
Show Answer
Answer: B. 1
Explanation: An OR gate produces 1 if at least one input is 1.
Q35. What will be the output of a NAND gate when both inputs are 1?
A. 1
B. 0
C. Undefined
D. Depends on the compiler
Show Answer
Answer: B. 0
Explanation: AND(1,1)=1, and the NOT operation changes it to 0.
Q36. What will be the output of a NOR gate when both inputs are 0?
A. 1
B. 0
C. Undefined
D. 00
Show Answer
Answer: A. 1
Explanation: OR(0,0)=0, and applying NOT gives 1.
Q37. What will be the output of an XOR gate for inputs A = 1 and B = 1?
A. 1
B. 0
C. Undefined
D. 11
Show Answer
Answer: B. 0
Explanation: XOR produces 1 only when the inputs are different.
Q38. Which of the following expressions represents the First De Morgan's Law?
A. (A + B)' = A' · B'
B. (A · B)' = A' + B'
C. Both A and B
D. None of these
Show Answer
Answer: C. Both A and B
Explanation: De Morgan's Laws are:
(A + B)' = A' · B'
(A · B)' = A' + B'
Q39. Logic gates are primarily used in:
A. Digital Electronic Circuits
B. Printers
C. Word Processors
D. Databases
Show Answer
Answer: A. Digital Electronic Circuits
Explanation: Logic gates are the fundamental building blocks of digital circuits.
Q40. Which statement about Boolean Logic is correct?
A. Logic gates perform logical operations.
B. Truth tables show outputs for every possible input combination.
C. De Morgan's Laws simplify Boolean expressions.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: Boolean Logic is based on logic gates, truth tables, and Boolean algebra, including De Morgan's Laws.
Q41. Which truth table belongs to the AND gate?
A. 00→0, 01→0, 10→0, 11→1
B. 00→0, 01→1, 10→1, 11→1
C. 00→1, 01→0, 10→0, 11→0
D. 00→0, 01→1, 10→1, 11→0
Show Answer
Answer: A.
Explanation: An AND gate produces 1 only when both inputs are 1.
Q42. Which truth table belongs to the XOR gate?
A. 00→0, 01→1, 10→1, 11→0
B. 00→0, 01→0, 10→0, 11→1
C. 00→1, 01→0, 10→0, 11→0
D. 00→0, 01→1, 10→1, 11→1
Show Answer
Answer: A.
Explanation: XOR outputs 1 only when the inputs differ.
Q43. Which gate is known as a Universal Gate?
A. AND
B. OR
C. NAND
D. NOT
Show Answer
Answer: C. NAND
Explanation: NAND (and also NOR) is called a universal gate because any Boolean function can be implemented using only NAND gates.
Q44. Which of the following is also a Universal Gate?
A. NOR
B. XOR
C. AND
D. OR
Show Answer
Answer: A. NOR
Explanation: NOR gates alone can also implement any Boolean function.
Q45. Boolean algebra deals with:
A. Decimal numbers only.
B. Binary values (0 and 1).
C. Floating-point numbers.
D. Characters.
Show Answer
Answer: B.
Explanation: Boolean algebra operates on binary values 0 (False) and 1 (True).
Q46. Which operator represents the AND operation in Boolean algebra?
A. +
B. · (dot)
C. /
D. -
Show Answer
Answer: B.
Explanation: The dot (·) denotes the logical AND operation.
Q47. Which operator represents the OR operation in Boolean algebra?
A. +
B. ×
C. /
D. -
Show Answer
Answer: A.
Explanation: The plus (+) symbol represents the logical OR operation.
Q48. The complement of a Boolean variable A is represented as:
A. A+
B. A·
C. A′
D. A=
Show Answer
Answer: C.
Explanation: The complement (NOT) of A is represented as A′.
Q49. Which law is mainly used to simplify Boolean expressions?
A. Newton's Law
B. De Morgan's Laws
C. Ohm's Law
D. Pascal's Law
Show Answer
Answer: B.
Explanation: De Morgan's Laws help simplify and transform Boolean expressions.
Q50. Which statement best summarizes Boolean Logic?
A. It is based on binary values 0 and 1.
B. Logic gates implement Boolean operations.
C. Truth tables and De Morgan's Laws are fundamental concepts.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: Boolean Logic forms the foundation of digital electronics and computer systems.
Number System MCQs (Part 4: Binary, Octal, Decimal & Hexadecimal)
Q51. Which number system uses only the digits 0 and 1?
A. Decimal
B. Octal
C. Binary
D. Hexadecimal
Show Answer
Answer: C. Binary
Explanation: The Binary Number System has a base of 2 and uses only the digits 0 and 1.
Q52. The Decimal Number System has a base of:
A. 2
B. 8
C. 10
D. 16
Show Answer
Answer: C. 10
Explanation: The Decimal Number System uses ten digits (0–9), so its base is 10.
Q53. The Octal Number System uses digits from:
A. 0 to 1
B. 0 to 7
C. 0 to 9
D. 0 to F
Show Answer
Answer: B. 0 to 7
Explanation: The Octal Number System has a base of 8 and uses digits 0 through 7.
Q54. Which symbol represents the decimal value 15 in the hexadecimal number system?
A. E
B. F
C. A
D. D
Show Answer
Answer: B. F
Explanation: In hexadecimal: A=10, B=11, C=12, D=13, E=14, F=15.
Q55. What is the decimal equivalent of (1010)2?
A. 8
B. 9
C. 10
D. 12
Show Answer
Answer: C. 10
Explanation: (1010)2 = 1×2³ + 0×2² + 1×2¹ + 0×2⁰ = 8 + 2 = 10.
Q56. What is the binary equivalent of decimal 13?
A. 1011
B. 1101
C. 1110
D. 1001
Show Answer
Answer: B. 1101
Explanation: 13 = 8 + 4 + 1 = (1101)2.
Q57. What is the octal equivalent of decimal 15?
A. 15
B. 17
C. 16
D. 20
Show Answer
Answer: B. 17
Explanation: 15 ÷ 8 = 1 remainder 7, so (15)10 = (17)8.
Q58. What is the hexadecimal equivalent of decimal 26?
A. 1B
B. 1A
C. 2A
D. 1C
Show Answer
Answer: B. 1A
Explanation: 26 = 1 × 16 + 10, and 10 is represented by A in hexadecimal.
Q59. What is the decimal equivalent of (17)8?
A. 13
B. 15
C. 17
D. 19
Show Answer
Answer: B. 15
Explanation: (17)8 = 1×8 + 7 = 15.
Q60. What is the decimal equivalent of (2F)16?
A. 45
B. 46
C. 47
D. 48
Show Answer
Answer: C. 47
Explanation: (2F)16 = 2×16 + 15 = 32 + 15 = 47.
Q61. Which number system is commonly used by computers for internal processing?
A. Decimal
B. Binary
C. Octal
D. Hexadecimal
Show Answer
Answer: B. Binary
Explanation: Computers process and store data using binary digits (0 and 1).
Q62. Which number system is commonly used as a compact representation of binary numbers?
A. Decimal
B. Hexadecimal
C. Binary
D. Roman
Show Answer
Answer: B. Hexadecimal
Explanation: One hexadecimal digit represents four binary bits, making it a compact representation.
Q63. One hexadecimal digit is equivalent to:
A. 2 Binary Bits
B. 3 Binary Bits
C. 4 Binary Bits
D. 8 Binary Bits
Show Answer
Answer: C. 4 Binary Bits
Explanation: Since hexadecimal has 16 symbols (2⁴), one hexadecimal digit represents four binary bits.
Q64. One octal digit is equivalent to:
A. 2 Binary Bits
B. 3 Binary Bits
C. 4 Binary Bits
D. 8 Binary Bits
Show Answer
Answer: B. 3 Binary Bits
Explanation: Since octal has 8 symbols (2³), one octal digit represents three binary bits.
Q65. Which hexadecimal digit represents the decimal value 12?
A. A
B. B
C. C
D. D
Show Answer
Answer: C. C
Explanation: In hexadecimal: A=10, B=11, C=12, D=13.
Q66. Which of the following is a valid hexadecimal number?
A. 129
B. 7G
C. A9F
D. 89H
Show Answer
Answer: C. A9F
Explanation: Hexadecimal uses digits 0–9 and letters A–F only.
Q67. Which of the following is NOT a valid octal number?
A. 725
B. 567
C. 189
D. 107
Show Answer
Answer: C. 189
Explanation: Octal numbers can contain only the digits 0–7.
Q68. Binary number 1111 is equal to which hexadecimal digit?
A. E
B. F
C. D
D. A
Show Answer
Answer: B. F
Explanation: Binary 1111 equals decimal 15, represented by F in hexadecimal.
Q69. Which conversion is easiest by grouping binary digits into groups of three?
A. Binary to Octal
B. Binary to Decimal
C. Binary to Hexadecimal
D. Decimal to Binary
Show Answer
Answer: A. Binary to Octal
Explanation: Three binary bits correspond to one octal digit.
Q70. Which conversion is easiest by grouping binary digits into groups of four?
A. Binary to Octal
B. Binary to Hexadecimal
C. Binary to Decimal
D. Decimal to Binary
Show Answer
Answer: B. Binary to Hexadecimal
Explanation: Four binary bits correspond to one hexadecimal digit.
Q71. What is the binary equivalent of hexadecimal A?
A. 1001
B. 1010
C. 1011
D. 1100
Show Answer
Answer: B. 1010
Explanation: Hexadecimal A represents decimal 10, which is binary 1010.
Q72. Which number system has a base of 16?
A. Binary
B. Octal
C. Decimal
D. Hexadecimal
Show Answer
Answer: D. Hexadecimal
Explanation: The hexadecimal number system uses sixteen symbols (0–9 and A–F).
Q73. Which statement is TRUE about number systems?
A. Binary uses base 2.
B. Octal uses base 8.
C. Hexadecimal uses base 16.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: Binary, Octal, and Hexadecimal use bases 2, 8, and 16 respectively.
Q74. Which conversion method is commonly used to convert decimal numbers to another base?
A. Repeated Division Method
B. Truth Table Method
C. Logic Gate Method
D. ASCII Method
Show Answer
Answer: A.
Explanation: Decimal numbers are converted to other bases using repeated division by the target base.
Q75. Which statement best summarizes number systems?
A. Computers internally use binary numbers.
B. Hexadecimal and octal provide compact representations of binary numbers.
C. Decimal, binary, octal, and hexadecimal numbers can be converted into one another.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: Understanding different number systems and their conversions is essential in computer science and digital electronics.
Encoding Schemes MCQs (Part 5: ASCII, ISCII, Unicode, UTF-8 & UTF-32)
Q76. What is an Encoding Scheme?
A. A method of converting characters into binary codes for storage and processing.
B. A type of operating system.
C. A programming language.
D. A computer network.
Show Answer
Answer: A.
Explanation: An encoding scheme assigns a unique binary value to each character so that computers can store and process text.
Q77. What does ASCII stand for?
A. American Standard Code for Information Interchange
B. Advanced Standard Coding for Internet Information
C. Automatic System Coding Interface
D. American Software Communication Interface
Show Answer
Answer: A.
Explanation: ASCII is one of the earliest and most widely used character encoding standards.
Q78. ASCII is mainly designed to represent:
A. English characters and symbols
B. All world languages
C. Images only
D. Audio files
Show Answer
Answer: A.
Explanation: ASCII was developed primarily to represent English letters, digits, punctuation marks, and control characters.
Q79. Which encoding standard was developed to represent Indian languages?
A. ASCII
B. Unicode
C. ISCII
D. UTF-32
Show Answer
Answer: C. ISCII
Explanation: ISCII (Indian Script Code for Information Interchange) was developed for Indian scripts such as Hindi, Bengali, Tamil, and others.
Q80. What does ISCII stand for?
A. Indian Script Code for Information Interchange
B. International Standard Code for Internet Information
C. Indian Software Communication Interface
D. Information Script Coding Interface
Show Answer
Answer: A.
Explanation: ISCII is a character encoding standard designed for Indian languages.
Q81. Which encoding scheme supports almost all languages of the world?
A. ASCII
B. ISCII
C. Unicode
D. EBCDIC
Show Answer
Answer: C. Unicode
Explanation: Unicode provides a universal character set capable of representing characters from nearly every writing system.
Q82. Which of the following is a Unicode encoding format?
A. UTF-8
B. UTF-32
C. UTF-16
D. All of these
Show Answer
Answer: D. All of these.
Explanation: UTF-8, UTF-16, and UTF-32 are standard Unicode Transformation Formats.
Q83. What does UTF stand for?
A. Unicode Transformation Format
B. Universal Text Format
C. Unified Transfer Format
D. Unicode Text File
Show Answer
Answer: A.
Explanation: UTF stands for Unicode Transformation Format.
Q84. Which Unicode encoding format is the most commonly used on the web?
A. UTF-8
B. UTF-32
C. ISCII
D. ASCII
Show Answer
Answer: A. UTF-8
Explanation: UTF-8 is widely used because it is compact, efficient, and compatible with ASCII.
Q85. Which Unicode encoding uses a fixed length of 32 bits per character?
A. UTF-8
B. UTF-16
C. UTF-32
D. ASCII
Show Answer
Answer: C. UTF-32
Explanation: UTF-32 represents every character using 32 bits (4 bytes).
Q86. Which encoding scheme is backward compatible with ASCII?
A. UTF-8
B. ISCII
C. UTF-32
D. None of these
Show Answer
Answer: A. UTF-8
Explanation: UTF-8 preserves the original ASCII character codes, making it backward compatible.
Q87. Which encoding scheme is best suited for multilingual applications?
A. ASCII
B. Unicode
C. ISCII only
D. EBCDIC
Show Answer
Answer: B. Unicode
Explanation: Unicode supports characters from nearly all languages and scripts.
Q88. Why was Unicode developed?
A. To replace binary numbers.
B. To provide a universal character encoding standard for all languages.
C. To increase Internet speed.
D. To replace operating systems.
Show Answer
Answer: B.
Explanation: Unicode was developed to eliminate incompatibility among different character encoding schemes.
Q89. Which of the following is TRUE about ASCII?
A. It mainly supports English characters.
B. It supports all world languages.
C. It uses Unicode code points.
D. It stores images.
Show Answer
Answer: A.
Explanation: ASCII primarily represents English letters, digits, symbols, and control characters.
Q90. Which encoding standard is specifically associated with Indian scripts?
A. UTF-8
B. ASCII
C. ISCII
D. UTF-32
Show Answer
Answer: C.
Explanation: ISCII was developed to support Indian languages.
Q91. Which encoding is preferred for web pages and Internet applications?
A. UTF-8
B. ASCII only
C. ISCII only
D. UTF-32
Show Answer
Answer: A.
Explanation: UTF-8 is the standard encoding used by most modern websites and web applications.
Q92. Which of the following statements is TRUE about UTF-32?
A. It uses a variable number of bytes.
B. It uses exactly 4 bytes for every character.
C. It is smaller than UTF-8 for English text.
D. It is identical to ASCII.
Show Answer
Answer: B.
Explanation: UTF-32 always stores each character using 32 bits (4 bytes).
Q93. Which encoding scheme allows computers to correctly display emojis and multilingual text?
A. ASCII
B. Unicode
C. Octal
D. Binary
Show Answer
Answer: B. Unicode
Explanation: Unicode supports emojis and characters from almost every language.
Q94. Which of the following is NOT an encoding scheme?
A. ASCII
B. Unicode
C. UTF-8
D. Linux
Show Answer
Answer: D. Linux
Explanation: Linux is an operating system, not a character encoding scheme.
Q95. Which encoding scheme provides better international language support than ASCII?
A. Unicode
B. Binary
C. Octal
D. Decimal
Show Answer
Answer: A.
Explanation: Unicode supports multilingual text, whereas ASCII mainly supports English characters.
Q96. Which of the following correctly matches the encoding scheme with its purpose?
A. ASCII – English Characters
B. ISCII – Indian Scripts
C. Unicode – Global Character Set
D. All of these
Show Answer
Answer: D.
Explanation: Each encoding scheme was designed for a specific purpose.
Q97. Which encoding standard is most suitable for storing multilingual documents?
A. ASCII
B. Unicode (UTF-8)
C. ISCII only
D. Decimal
Show Answer
Answer: B.
Explanation: UTF-8 supports multilingual text efficiently and is widely adopted.
Q98. Which statement about Unicode is correct?
A. It supports almost every language.
B. It includes UTF-8 and UTF-32 encoding formats.
C. It overcomes the limitations of ASCII.
D. All of these.
Show Answer
Answer: D.
Explanation: Unicode is a universal standard designed to represent characters from almost all writing systems.
Q99. Why is character encoding important?
A. It enables computers to store and process text correctly.
B. It increases processor speed.
C. It replaces the operating system.
D. It improves Internet bandwidth.
Show Answer
Answer: A.
Explanation: Character encoding assigns numeric values to characters so computers can store, transmit, and display text accurately.
Q100. Which statement best summarizes encoding schemes?
A. ASCII mainly supports English characters.
B. ISCII supports Indian scripts.
C. Unicode (UTF-8, UTF-32) supports multilingual computing.
D. All of these.
Show Answer
Answer: D. All of these.
Explanation: ASCII, ISCII, and Unicode serve different purposes, with Unicode providing comprehensive multilingual support.
Answer Key (Q76–Q100)
| Q.No. | Answer | Q.No. | Answer | Q.No. | Answer |
|---|---|---|---|---|---|
| 76 | A | 85 | C | 94 | D |
| 77 | A | 86 | A | 95 | A |
| 78 | A | 87 | B | 96 | D |
| 79 | C | 88 | B | 97 | B |
| 80 | A | 89 | A | 98 | D |
| 81 | C | 90 | C | 99 | A |
| 82 | D | 91 | A | 100 | D |
| 83 | A | 92 | B | ||
| 84 | A | 93 | B |
Practice Tips
- Operating System: Revise the functions of the OS, including process management, memory management, file management, device management, security, and the differences between GUI and CLI.
- Boolean Logic: Memorize the truth tables for NOT, AND, OR, NAND, NOR, and XOR gates. Learn both De Morgan's Laws and identify NAND and NOR as universal gates.
- Number System:
- Binary → Base 2
- Octal → Base 8
- Decimal → Base 10
- Hexadecimal → Base 16
- Practice conversions between all number systems.
- Encoding Schemes:
- ASCII → English characters
- ISCII → Indian scripts
- Unicode → Global character set
- UTF-8 → Most common on the web and backward compatible with ASCII
- UTF-32 → Fixed length of 4 bytes per character
- Practice competency-based and application-oriented questions, as CBSE frequently asks conceptual MCQs on operating systems, logic gates, number system conversions, and character encoding schemes.