Below are the 50 Essential Computer Science MCQs with Answers for Beginners:
1➤ What does CPU stand for?
ⓑ Central Programming Unit
ⓒ Control Processing Unit
ⓓ Centralized Processing Unit
2➤ Which of the following is not an operating system?
ⓑ Linux
ⓒ Microsoft Office
ⓓ macOS
3➤ What is the primary function of RAM?
ⓑ Store temporary data
ⓒ Process data
ⓓ Manage input/output
4➤ Which of the following is a programming language?
ⓑ CSS
ⓒ Python
ⓓ SQL
5➤ What does URL stand for?
ⓑ Universal Resource Link
ⓒ Uniform Resource Link
ⓓ Unique Resource Locator
6➤ What is the function of an operating system?
ⓑ Create applications
ⓒ Serve as a database
ⓓ Run web browsers
7➤ Which data structure uses Last In First Out (LIFO)?
ⓑ Stack
ⓒ Array
ⓓ Linked List
8➤ Which of the following is a type of malware?
ⓑ Virus
ⓒ Web browser
ⓓ Operating System
9➤ What is an example of a non-volatile memory?
ⓑ Cache
ⓒ Hard Drive
ⓓ Registers
10➤ Which protocol is used for secure communication over the internet?
ⓑ FTP
ⓒ HTTPS
ⓓ SMTP
11➤ What does GUI stand for?
ⓑ General User Interface
ⓒ Graphical Unified Interface
ⓓ General Unified Interface
12➤ Which of the following is a cloud computing service?
ⓑ Microsoft Word
ⓒ Adobe Photoshop
ⓓ Notepad
13➤ What does the acronym SQL stand for?
ⓑ Sequential Query Language
ⓒ Standard Query Language
ⓓ Simple Query Language
14➤ What is the main purpose of a compiler?
ⓑ To convert source code to machine code
ⓒ To debug code
ⓓ To compile documentation
15➤ Which of the following is not a type of loop?
ⓑ While loop
ⓒ Do-while loop
ⓓ If loop
16➤ What is the time complexity of binary search?
ⓑ O(log n)
ⓒ O(n log n)
ⓓ O(1)
17➤ Which of the following sorting algorithms is the fastest in average case?
ⓑ Selection Sort
ⓒ Quick Sort
ⓓ Insertion Sort
18➤ What is a characteristic of a relational database?
ⓑ Data is stored in tables
ⓒ Does not support SQL
ⓓ Data is unstructured
19➤ What does the 'P' in 'PHP' stand for?
ⓑ Professional
ⓒ Preprocessor
ⓓ Hypertext
20➤ What is an IP address?
ⓑ Internet Provider address
ⓒ Internet Personal address
ⓓ Internal Protocol address
21➤ Which of the following is a front-end web development technology?
ⓑ PHP
ⓒ JavaScript
ⓓ SQL
22➤ What does the acronym API stand for?
ⓑ Application Program Interface
ⓒ Advanced Programming Interface
ⓓ Automated Programming Interface
23➤ Which programming paradigm uses "objects"?
ⓑ Functional
ⓒ Object-Oriented
ⓓ Imperative
24➤ What is the main purpose of a firewall?
ⓑ Protect the network from unauthorized access
ⓒ Store data securely
ⓓ Backup data
25➤ Which of the following is a feature of Python?
ⓑ Dynamic typing
ⓒ Compiled language
ⓓ No support for OOP
26➤ What is the function of a DNS?
ⓑ To secure internet connections
ⓒ To manage network traffic
ⓓ To host websites
27➤ Which of the following is a characteristic of cloud storage?
ⓑ Requires physical media
ⓒ Accessible from anywhere with internet
ⓓ Limited to a single device
28➤ What does HTTPS stand for?
ⓑ HyperText Transfer Protocol Site
ⓒ HyperTransfer Text Protocol Secure
ⓓ HyperText Transfer Protection Secure
29➤ Which of the following languages is primarily used for web development?
ⓑ Java
ⓒ HTML
ⓓ Assembly
30➤ What is a 'bug' in computer programming?
ⓑ An error in code
ⓒ A security feature
ⓓ A hardware issue
31➤ Which of the following is an example of an algorithm?
ⓑ A series of steps to solve a problem
ⓒ A type of software
ⓓ A data structure
32➤ What is the main advantage of using version control?
ⓑ Keeps track of changes in code
ⓒ Decreases collaboration
ⓓ Prevents backups
33➤ Which of the following is an example of an Integrated Development Environment (IDE)?
ⓑ Git
ⓒ Markdown
ⓓ JSON
34➤ What does 'HTML' stand for?
ⓑ HyperText Multi Language
ⓒ HyperTool Markup Language
ⓓ HyperText Markup Language
35➤ Which component of a computer is responsible for graphics processing?
ⓑ HDD
ⓒ CPU
ⓓ RAM
36➤ Which algorithm is commonly used for pathfinding in games?
ⓑ Dijkstra's algorithm
ⓒ Merge sort
ⓓ Quick sort
37➤ What is the purpose of a bootstrap framework?
ⓑ To compile code
ⓒ To create responsive web designs
ⓓ To write database queries
38➤ Which of the following is used for debugging?
ⓑ Compiler
ⓒ Editor
ⓓ Interpreter
39➤ What does 'open-source' mean?
ⓑ Code is only for commercial use
ⓒ Code is encrypted
ⓓ Code is available for anyone to use and modify
40➤ Which of the following is an example of a NoSQL database?
ⓑ MySQL
ⓒ MongoDB
ⓓ PostgreSQL
41➤ What is the main role of a software engineer?
ⓑ Design hardware components
ⓒ Develop web pages
ⓓ Manage network infrastructure
42➤ What does the term 'machine learning' refer to?
ⓑ A branch of artificial intelligence where systems learn from data
ⓒ Writing algorithms for computer graphics
ⓓ Teaching computers to operate machinery
43➤ Which of the following is NOT a common programming paradigm?
ⓑ Functional
ⓒ Procedural
ⓓ Linear
44➤ What is the purpose of the 'return' statement in a function?
ⓑ To exit the function and send a value back
ⓒ To define a variable
ⓓ To create a loop
45➤ What does 'JSON' stand for?
ⓑ JavaScript Standard Object Notation
ⓒ Java Serialized Object Notation
ⓓ Java Syntax Object Notation
46➤ Which of the following is an advantage of using a linked list?
ⓑ Random access to elements
ⓒ Easier to implement than arrays
ⓓ Faster than arrays for all operations
47➤ What is an example of a search engine?
ⓑ Excel
ⓒ Word
ⓓ PowerPoint
48➤ What is the purpose of a virtual machine?
ⓑ To run multiple operating systems on a single physical machine
ⓒ To enhance graphics rendering
ⓓ To speed up hardware performance
49➤ Which of the following is not a programming language?
ⓑ Java
ⓒ C#
ⓓ Linux
50➤ What does 'byte' refer to in computing?
ⓑ A single character of data
ⓒ A hardware component
ⓓ A type of malware
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