CSS Computer Science MCQs

This comprehensive collection of MCQs on Computer Science for the Central Superior Services (CSS) examination is designed to equip candidates with a solid understanding of fundamental concepts in computing, information technology, and software development. Covering a wide range of topics, including programming, data structures, algorithms, networking, and database management, these questions aim to enhance candidates’ technical skills and analytical thinking essential for success in the CSS exams.

Who Should Practice Computer Science MCQs?

CSS aspirants: Ideal for candidates preparing for the CSS examination who wish to strengthen their performance in the Computer Science section.
Students of computer science and IT: Beneficial for individuals pursuing academic paths in computer science, information technology, and related fields, providing a solid foundation in key concepts.
Job seekers in public service: Perfect for those aiming for government positions where technical literacy and understanding of information systems are crucial.
Professionals looking to refresh their knowledge: Suitable for anyone interested in broadening their understanding of computer science principles and their applications.

1. What is the primary purpose of an operating system?

A) To manage computer hardware and software resources
B) To provide internet connectivity
C) To enhance graphics performance
D) To secure the system from viruses

View Answer

2. Which component is considered the brain of the computer?

A) RAM
B) Hard Drive
C) CPU
D) Motherboard

View Answer

3. Which of the following is a type of software?

A) Operating System
B) Hardware
C) Network
D) All of the above

View Answer

4. What does HTTP stand for?

A) Hypertext Transfer Protocol
B) Hyperlink Text Transfer Protocol
C) High Transfer Text Protocol
D) Hypertext Transmission Protocol

View Answer

5. Which storage device is known for its speed?

A) Hard Disk Drive
B) USB Flash Drive
C) Solid State Drive
D) CD-ROM

View Answer

6. Which number system uses only two digits?

A) Decimal
B) Binary
C) Octal
D) Hexadecimal

View Answer

7. What is the main function of input devices?

A) To display information
B) To store data
C) To receive data from the user
D) To process data

View Answer

8. What is the difference between a virus and a worm?

A) A virus replicates itself; a worm does not.
B) A worm replicates itself; a virus does not.
C) Both are the same.
D) A virus is harmless; a worm is harmful.

View Answer

9. Which of the following is a programming language?

A) HTML
B) CSS
C) Python
D) SQL

View Answer

10. In object-oriented programming, what is encapsulation?

A) Hiding the implementation details
B) Inheriting properties from another class
C) Creating multiple forms of the same function
D) Grouping related functions and variables

View Answer

11. What is the purpose of a compiler?

A) To execute programs
B) To convert high-level code into machine code
C) To manage memory
D) To debug programs

View Answer

12. Which of the following sorting algorithms is the most efficient in terms of average-case time complexity?

A) Bubble Sort
B) Insertion Sort
C) Quick Sort
D) Selection Sort

View Answer

13. What does SQL stand for?

A) Structured Query Language
B) Simple Query Language
C) Standard Query Language
D) Systematic Query Language

View Answer

14. Which data structure follows the Last In First Out (LIFO) principle?

A) Queue
B) Stack
C) Array
D) Linked List

View Answer

15. In networking, what does IP stand for?

A) Internet Protocol
B) Internal Protocol
C) Interconnected Protocol
D) International Protocol

View Answer

16. Which layer of the OSI model is responsible for establishing, managing, and terminating connections?

A) Application Layer
B) Transport Layer
C) Session Layer
D) Network Layer

View Answer

17. What is the role of cache memory in a computer?

A) To permanently store data
B) To speed up data access
C) To enhance graphics performance
D) To manage input and output

View Answer

18. Which of the following is a characteristic of RISC architecture?

A) Complex instructions
B) Many addressing modes
C) Simplicity and efficiency
D) High power consumption

View Answer

19. What is the primary purpose of a database management system (DBMS)?

A) To store and retrieve data
B) To create graphics
C) To manage network traffic
D) To provide system security

View Answer

20. Which of the following is a form of malware?

A) Firewall
B) Trojan Horse
C) Router
D) Operating System

View Answer

21. In which phase of software development do requirements gathering occur?

A) Design Phase
B) Implementation Phase
C) Planning Phase
D) Testing Phase

View Answer

22. What does the acronym URL stand for?

A) Uniform Resource Locator
B) Universal Resource Locator
C) Uniform Reference Locator
D) Universal Reference Locator

View Answer

23. Which of the following is NOT a function of an operating system?

A) Process management
B) Memory management
C) Graphics rendering
D) Device management

View Answer

24. What does AJAX stand for in web development?

A) Asynchronous JavaScript and XML
B) Asynchronous Java and XHTML
C) Asynchronous JavaScript and XHTML
D) Asynchronous Java and XML

View Answer

25. Which type of database is optimized for data analysis and reporting?

A) Relational Database
B) Object-Oriented Database
C) NoSQL Database
D) Data Warehouse

View Answer

26. What is polymorphism in object-oriented programming?

A) The ability to take multiple forms
B) The process of combining data
C) The ability to store data
D) The method of overriding functions

View Answer

27. In HTML, which tag is used to create a hyperlink?

A) <link>
B) <a>
C) <href>
D) <url>

View Answer

28. What does the acronym DNS stand for?

A) Domain Name System
B) Dynamic Name Service
C) Digital Network System
D) Domain Network Service

View Answer

29. Which of the following is an advantage of cloud computing?

A) Increased hardware costs
B) Scalability
C) Limited access
D) Data loss

View Answer

30. In a binary tree, which traversal method visits nodes in the order of Left, Root, Right?

A) In-order traversal
B) Pre-order traversal
C) Post-order traversal
D) Level-order traversal

View Answer

31. Which of the following is used for version control in software development?

A) Git
B) SQL
C) HTML
D) Java

View Answer

32. Which algorithm is used to find the shortest path in a graph?

A) Dijkstra’s Algorithm
B) Bubble Sort
C) Quick Sort
D) Depth-First Search

View Answer

33. What does SSL stand for in web security?

A) Secure Socket Layer
B) Secure Sockets List
C) Secure Software Layer
D) Simple Socket Layer

View Answer

34. Which data structure is used to implement recursion?

A) Queue
B) Stack
C) Array
D) Linked List

View Answer

35. What type of programming language is Python?

A) Low-level
B) Assembly
C) High-level
D) Markup

View Answer

36. Which of the following is a characteristic of cloud storage?

A) Local storage
B) On-demand access
C) Limited scalability
D) High maintenance cost

View Answer

37. In which phase of the software development life cycle do you perform system testing?

A) Requirement Analysis
B) Design
C) Implementation
D) Maintenance

View Answer

38. Which file system is used by Windows operating systems?

A) FAT32
B) ext4
C) HFS+
D) NTFS

View Answer

39. Which of the following is a markup language?

A) JavaScript
B) HTML
C) C++
D) Python

View Answer

40. What is the function of a router in a network?

A) To connect devices within a single network
B) To route data between different networks
C) To enhance signal strength
D) To store data temporarily

View Answer

41. What does the term ‘Big Data’ refer to?

A) Data that is too large to be processed by traditional methods
B) Data stored in a large database
C) Data with high accuracy
D) Data that is encrypted

View Answer

42. Which of the following is NOT a database management system?

A) MySQL
B) Oracle
C) Windows
D) MongoDB

View Answer

43. What is the purpose of an API?

A) To create user interfaces
B) To allow different software programs to communicate
C) To store data
D) To secure a network

View Answer

44. What type of algorithm is used for encryption?

A) Sorting Algorithm
B) Search Algorithm
C) Cryptographic Algorithm
D) Heuristic Algorithm

View Answer

45. Which programming paradigm focuses on the use of objects?

A) Procedural Programming
B) Functional Programming
C) Object-Oriented Programming
D) Logic Programming

View Answer

46. In a relational database, what is a primary key?

A) A unique identifier for a record
B) A key used for encryption
C) A foreign key reference
D) A backup key

View Answer

47. Which of the following is a cloud service model?

A) SaaS
B) PAS
C) PASM
D) CAS

View Answer

48. What is the main purpose of normalization in databases?

A) To increase redundancy
B) To reduce data redundancy
C) To enhance data security
D) To improve data retrieval speed

View Answer

49. Which of the following protocols is used for secure data transmission over the Internet?

A) HTTP
B) FTP
C) HTTPS
D) SMTP

View Answer

50. What is the term for a network that covers a small geographical area, like a home or office?

A) WAN
B) LAN
C) MAN
D) PAN

View Answer

51. Which of the following is NOT an advantage of using open-source software?

A) Customizability
B) Cost-effectiveness
C) Regular updates
D) Lack of community support

View Answer

52. What type of attack involves overwhelming a network with traffic?

A) Phishing
B) DDoS
C) Malware
D) SQL Injection

View Answer

53. In programming, what is a loop used for?

A) To create functions
B) To execute a block of code multiple times
C) To store data
D) To manage user input

View Answer

54. Which of the following is a type of NoSQL database?

A) Oracle
B) MongoDB
C) MySQL
D) PostgreSQL

View Answer

55. What is a distributed system?

A) A system with a single point of failure
B) A system where components are located on different networked computers
C) A system with centralized data processing
D) A system with no user interaction

View Answer

56. Which of the following is a characteristic of agile software development?

A) Heavy documentation
B) Fixed requirements
C) Incremental delivery
D) Long development cycles

View Answer

57. What is a function in programming?

A) A collection of statements that perform a specific task
B) A data structure
C) A variable
D) A type of loop

View Answer

58. In HTML, which tag is used for the largest heading?

A) <h6>
B) <h1>
C) <heading>
D) <title>

View Answer

59. What does the term ‘responsive design’ refer to in web development?

A) Designing for fast loading times
B) Creating websites that adapt to different screen sizes
C) Designing for specific browsers
D) Developing for mobile devices only

View Answer

60. Which programming language is primarily used for web development?

A) C++
B) JavaScript
C) Python
D) Java

View Answer

61. What is the role of an embedded system?

A) To provide high-level data processing
B) To perform specific tasks within larger systems
C) To manage network traffic
D) To create user interfaces

View Answer

62. Which of the following is a feature of object-oriented programming?

A) Data hiding
B) Global variables
C) Sequential processing
D) Flat structure

View Answer

63. What does the acronym CRUD stand for in database management?

A) Create, Read, Update, Delete
B) Create, Remove, Upload, Download
C) Copy, Read, Update, Delete
D) Create, Retrieve, Update, Delete

View Answer

64. In the context of software testing, what is a ‘bug’?

A) A hardware issue
B) An error in software
C) A network problem
D) A user interface flaw

View Answer

65. What is the primary purpose of the TCP protocol?

A) To format web pages
B) To ensure reliable communication over a network
C) To encrypt data
D) To manage database transactions

View Answer

66. Which of the following is an example of a client-side scripting language?

A) PHP
B) Python
C) JavaScript
D) Ruby

View Answer

67. What is the main advantage of using a VPN?

A) It speeds up internet connection
B) It provides anonymity and security
C) It improves website loading speed
D) It limits access to certain sites

View Answer

68. In data mining, what is ‘clustering’?

A) Combining different datasets
B) Grouping similar data points
C) Encrypting data
D) Data validation

View Answer

69. Which of the following is a disadvantage of a relational database?

A) Data integrity
B) Flexibility
C) Complexity in design
D) Ease of use

View Answer

70. What is the purpose of a firewall in a network?

A) To enhance signal strength
B) To monitor and control incoming and outgoing network traffic
C) To store data
D) To connect different networks

View Answer

71. In which format is a SQL query typically written?

A) HTML
B) XML
C) Plain text
D) JSON

View Answer

72. What is a deadlock in operating systems?

A) When two or more processes are waiting indefinitely for a resource
B) When a system crashes
C) When a process is completed
D) When a system runs out of memory

View Answer

73. Which of the following algorithms is used for data compression?

A) Huffman Coding
B) Dijkstra’s Algorithm
C) Merge Sort
D) Depth-First Search

View Answer

74. What does the term ‘latency’ refer to in networking?

A) The amount of data transferred
B) The delay before a transfer of data begins
C) The speed of the connection
D) The maximum data capacity

View Answer

75. Which of the following is a cloud storage service?

A) Dropbox
B) Microsoft Word
C) Adobe Photoshop
D) Visual Studio

View Answer

76. What is the main benefit of using Agile methodology?

A) Fixed scope
B) Flexibility and adaptability
C) Longer development cycles
D) More documentation

View Answer

77. Which of the following is used to create dynamic web pages?

A) HTML
B) CSS
C) JavaScript
D) SQL

View Answer

78. In which phase of the software development life cycle do you gather requirements from stakeholders?

A) Implementation
B) Testing
C) Requirement Analysis
D) Maintenance

View Answer

79. Which of the following is an example of a NoSQL database?

A) SQLite
B) MongoDB
C) PostgreSQL
D) Microsoft Access

View Answer

80. What does the acronym IoT stand for?

A) Internet of Things
B) Integration of Technologies
C) Internal Operating Tool
D) Internet of Technology

View Answer

81. Which of the following is a non-relational database?

A) MySQL
B) Microsoft SQL Server
C) CouchDB
D) Oracle

View Answer

82. What does UX stand for in web design?

A) User Experience
B) User Exchange
C) Unified Experience
D) Unique Execution

View Answer

83. Which type of software is designed to help users perform tasks?

A) System Software
B) Application Software
C) Firmware
D) Utility Software

View Answer

84. What is the main function of an operating system’s kernel?

A) To manage hardware resources
B) To provide a user interface
C) To run applications
D) To handle networking

View Answer

85. Which data structure is used for implementing a priority queue?

A) Stack
B) Linked List
C) Binary Heap
D) Array

View Answer

86. What is the purpose of a subnet mask in networking?

A) To identify the gateway
B) To create secure connections
C) To divide an IP address into network and host portions
D) To allocate bandwidth

View Answer

87. In SQL, which command is used to delete data from a table?

A) REMOVE
B) DELETE
C) DROP
D) TRUNCATE

View Answer

88. What does the term ‘phishing’ refer to in cybersecurity?

A) Hacking into systems
B) Tricking users into revealing sensitive information
C) Data encryption
D) Unauthorized access to networks

View Answer

89. Which of the following is an example of a markup language?

A) C#
B) Python
C) HTML
D) JavaScript

View Answer

90. What is the purpose of data validation in databases?

A) To encrypt sensitive information
B) To ensure data integrity and accuracy
C) To optimize queries
D) To generate reports

View Answer

91. Which of the following is NOT a function of the application layer in the OSI model?

A) Data formatting
B) Error detection
C) Application support
D) Session management

View Answer

92. In web development, what does CSS stand for?

A) Computer Style Sheets
B) Cascading Style Sheets
C) Creative Style Sheets
D) Common Style Sheets

View Answer

93. What is the purpose of indexing in databases?

A) To improve data integrity
B) To speed up data retrieval
C) To compress data
D) To encrypt data

View Answer

94. Which of the following is a method of searching for data in a database?

A) Binary Search
B) Quick Sort
C) Hashing
D) Indexing

View Answer

95. Which of the following is a characteristic of a relational database?

A) Hierarchical structure
B) Data is stored in tables
C) Non-structured data
D) Limited data retrieval options

View Answer

96. What is a primary benefit of using version control systems?

A) They reduce the need for documentation
B) They allow tracking of changes in code
C) They improve the speed of execution
D) They eliminate the need for backups

View Answer

97. What is the purpose of the ‘SELECT’ statement in SQL?

A) To insert new records
B) To retrieve data from a database
C) To update existing records
D) To delete records

View Answer

98. Which of the following is a technique used for data compression?

A) Data Redundancy
B) Huffman Coding
C) Bubble Sort
D) Linear Search

View Answer

99. What is a benefit of using multi-threading in programming?

A) Reducing code complexity
B) Faster execution by utilizing multiple CPU cores
C) Eliminating the need for synchronization
D) Limiting resource usage

View Answer

100. Which of the following refers to the process of finding and fixing defects in software?

A) Debugging
B) Compiling
C) Executing
D) Documenting

View Answer