50 Coding & Tech Quiz Questions and Answers

This page lists 50 real questions from the Quizlino Coding & Tech Quiz category, each with four options, the correct answer and, where available, a short explanation. They are arranged from easy to hard, so you can start at the level that suits you. The full category contains 200 questions spread across its levels, so what you see here is a sample to study from, not the whole quiz.

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Coding & Tech: Easy Questions

Warm-up questions that most players can answer.

Q1. What does 'HTML' stand for?

A. HyperText Markup Language
B. High Tech Modern Language
C. HyperText Machine Language
D. Home Tool Markup Language

Answer: A. HyperText Markup Language

Explanation: HTML stands for HyperText Markup Language, used to structure web pages.

Q2. What does 'CSS' stand for?

A. Creative Style Sheets
B. Cascading Style Sheets
C. Computer Style Syntax
D. Colorful Style Sheets

Answer: B. Cascading Style Sheets

Explanation: CSS stands for Cascading Style Sheets, used to style web pages.

Q3. Who created the Python programming language?

A. Guido van Rossum
B. Dennis Ritchie
C. James Gosling
D. Bjarne Stroustrup

Answer: A. Guido van Rossum

Explanation: Guido van Rossum created the Python programming language, first released in 1991.

Q4. What does 'CPU' stand for?

A. Central Processing Unit
B. Computer Personal Unit
C. Central Program Utility
D. Core Processing Unit

Answer: A. Central Processing Unit

Explanation: CPU stands for Central Processing Unit, the 'brain' of a computer.

Q5. What does 'URL' stand for?

A. Uniform Resource Locator
B. Universal Reference Link
C. United Resource Locator
D. Uniform Reference Locator

Answer: A. Uniform Resource Locator

Explanation: URL stands for Uniform Resource Locator, the address of a web page.

Q6. Which symbol is commonly used for single-line comments in JavaScript?

A. #
B. //
C. <!--
D. **

Answer: B. //

Explanation: JavaScript uses // to mark a single-line comment.

Q7. What does 'RAM' stand for?

A. Random Access Memory
B. Read Access Memory
C. Rapid Access Module
D. Random Application Memory

Answer: A. Random Access Memory

Explanation: RAM stands for Random Access Memory, used for temporary data storage while a computer runs.

Q8. Which company developed the Android operating system?

A. Apple
B. Google
C. Microsoft
D. Samsung

Answer: B. Google

Explanation: Google develops and maintains the Android operating system.

Q9. What does 'www' stand for in a website address?

A. World Wide Web
B. World Web Wide
C. Wide World Web
D. Web World Wide

Answer: A. World Wide Web

Explanation: WWW stands for World Wide Web, the system of linked web pages.

Q10. Which language is primarily used to add interactivity to web pages?

A. HTML
B. CSS
C. JavaScript
D. XML

Answer: C. JavaScript

Explanation: JavaScript is the primary language used for interactivity on web pages.

Q11. What does 'USB' stand for?

A. Universal Serial Bus
B. United System Board
C. Universal System Backup
D. Unified Serial Board

Answer: A. Universal Serial Bus

Explanation: USB (Universal Serial Bus) is a common standard for connecting devices to computers.

Q12. Which company developed the iPhone?

A. Samsung
B. Apple
C. Google
D. Sony

Answer: B. Apple

Explanation: Apple launched the first iPhone in 2007.

Q13. What does 'GPU' stand for?

A. General Processing Unit
B. Graphics Processing Unit
C. Global Power Unit
D. Gaming Processor Unit

Answer: B. Graphics Processing Unit

Explanation: A GPU (Graphics Processing Unit) handles rendering images, video, and graphics.

Q14. Which company created the Windows operating system?

A. Apple
B. Microsoft
C. IBM
D. Google

Answer: B. Microsoft

Explanation: Microsoft has developed the Windows operating system since 1985.

Q15. What does 'PDF' stand for?

A. Portable Document Format
B. Personal Data File
C. Printed Document Form
D. Public Data Format

Answer: A. Portable Document Format

Explanation: PDF stands for Portable Document Format, created by Adobe.

Coding & Tech: Medium Questions

A step up in difficulty, for players who know the basics.

Q16. What does 'API' stand for?

A. Application Programming Interface
B. Automated Program Installer
C. Advanced Programming Index
D. Application Process Integration

Answer: A. Application Programming Interface

Explanation: API stands for Application Programming Interface, allowing software to communicate.

Q17. Which company originally developed the JavaScript language?

A. Microsoft
B. Netscape
C. Sun Microsystems
D. Apple

Answer: B. Netscape

Explanation: JavaScript was created by Brendan Eich at Netscape in 1995.

Q18. What does 'SQL' stand for?

A. Structured Query Language
B. System Query Logic
C. Standard Question Language
D. Sequential Query Language

Answer: A. Structured Query Language

Explanation: SQL stands for Structured Query Language, used to manage databases.

Q19. Which version control system, created by Linus Torvalds, powers platforms like GitHub?

A. SVN
B. Git
C. Mercurial
D. CVS

Answer: B. Git

Explanation: Git, created by Linus Torvalds, is the version control system underlying GitHub.

Q20. What does 'AI' stand for?

A. Artificial Intelligence
B. Automated Interface
C. Applied Informatics
D. Advanced Internet

Answer: A. Artificial Intelligence

Explanation: AI stands for Artificial Intelligence, technology that simulates human-like reasoning.

Q21. Which company owns GitHub?

A. Google
B. Microsoft
C. Amazon
D. IBM

Answer: B. Microsoft

Explanation: Microsoft acquired GitHub in 2018.

Q22. What does 'IDE' stand for in programming?

A. Integrated Development Environment
B. Internet Data Exchange
C. Interactive Design Engine
D. Internal Debug Environment

Answer: A. Integrated Development Environment

Explanation: An IDE (Integrated Development Environment) is software used to write and debug code.

Q23. What does 'HTTP' stand for?

A. HyperText Transfer Protocol
B. High Transfer Text Protocol
C. Home Text Transfer Program
D. HyperText Technical Process

Answer: A. HyperText Transfer Protocol

Explanation: HTTP stands for HyperText Transfer Protocol, used to load web pages.

Q24. Which lightweight data format uses key-value pairs, like {"name":"John"}?

A. XML
B. JSON
C. CSV
D. YAML

Answer: B. JSON

Explanation: JSON (JavaScript Object Notation) is a common lightweight data-interchange format.

Q25. What does 'OS' stand for?

A. Operating System
B. Output Software
C. Online Server
D. Optimized Storage

Answer: A. Operating System

Explanation: OS stands for Operating System, the core software managing a computer's hardware and programs.

Q26. What does 'SaaS' stand for in the tech industry?

A. Software as a Service
B. System as a Server
C. Storage and Analytics Service
D. Secure Application Service

Answer: A. Software as a Service

Explanation: SaaS (Software as a Service) refers to software delivered over the internet, usually via subscription.

Q27. Which programming language, created by James Gosling, follows the philosophy of 'write once, run anywhere'?

A. Python
B. Java
C. C++
D. Ruby

Answer: B. Java

Explanation: Java, created by James Gosling at Sun Microsystems, was designed to run on any platform.

Q28. Which company originally developed the Bootstrap CSS framework for internal use?

A. Google
B. Twitter
C. Facebook
D. Microsoft

Answer: B. Twitter

Explanation: Bootstrap was originally developed at Twitter before being released as an open-source framework.

Q29. What does 'IoT' stand for?

A. Internet of Things
B. Input Output Technology
C. Integrated Online Tools
D. Internal Operating Terminal

Answer: A. Internet of Things

Explanation: IoT (Internet of Things) refers to everyday physical devices connected to the internet.

Q30. Which company develops the Pixel line of Android smartphones?

A. Samsung
B. Google
C. OnePlus
D. Xiaomi

Answer: B. Google

Explanation: Google designs and sells the Pixel smartphone line, running Android.

Coding & Tech: Hard Questions

Challenging questions for confident players.

Q31. Who is considered the 'father of computers' for designing the Analytical Engine?

A. Alan Turing
B. Charles Babbage
C. Ada Lovelace
D. John von Neumann

Answer: B. Charles Babbage

Explanation: Charles Babbage designed the Analytical Engine, an early mechanical computer concept.

Q32. What extra layer of security does HTTPS add compared to plain HTTP?

A. Compression
B. Encryption
C. Faster loading
D. Larger storage

Answer: B. Encryption

Explanation: HTTPS adds encryption (via SSL/TLS) to secure data transferred between browser and server.

Q33. Which company created the ChatGPT AI chatbot?

A. Google
B. OpenAI
C. Meta
D. Amazon

Answer: B. OpenAI

Explanation: OpenAI developed and released the ChatGPT AI chatbot.

Q34. What is the term for an automated program that scans and indexes content across websites for search engines?

A. Web crawler
B. Web server
C. Web host
D. Web proxy

Answer: A. Web crawler

Explanation: A web crawler (or spider/bot) automatically scans websites to index their content.

Q35. What does 'PHP' officially stand for, as a recursive acronym?

A. Personal Home Page
B. PHP: Hypertext Preprocessor
C. Programmed Hypertext Protocol
D. Processed HTML Pages

Answer: B. PHP: Hypertext Preprocessor

Explanation: PHP officially stands for 'PHP: Hypertext Preprocessor', a recursive acronym.

Q36. Which programming language, created in 1972, remains foundational to Unix and many modern systems?

A. Fortran
B. C
C. Pascal
D. COBOL

Answer: B. C

Explanation: The C programming language, created in 1972, underlies Unix and much of modern computing.

Q37. Who is known as the creator of the Linux operating system kernel?

A. Bill Gates
B. Linus Torvalds
C. Steve Wozniak
D. Dennis Ritchie

Answer: B. Linus Torvalds

Explanation: Linus Torvalds created the Linux kernel in 1991 while a university student.

Q38. What does 'DNS' stand for, the system that translates domain names into IP addresses?

A. Domain Name System
B. Data Network Service
C. Digital Naming Standard
D. Domain Network Server

Answer: A. Domain Name System

Explanation: DNS (Domain Name System) translates human-readable domain names into IP addresses computers use.

Q39. TCP/IP, the foundational protocol suite of the modern internet, was developed as part of a project funded by which US agency?

A. NASA
B. DARPA
C. NIST
D. FCC

Answer: B. DARPA

Explanation: TCP/IP grew out of ARPANET research funded by DARPA, the US Defense Advanced Research Projects Agency.

Q40. What does 'GPT' stand for in 'ChatGPT'?

A. General Purpose Technology
B. Generative Pre-trained Transformer
C. Global Processing Terminal
D. Graphical Programming Tool

Answer: B. Generative Pre-trained Transformer

Explanation: GPT stands for Generative Pre-trained Transformer, the AI model architecture behind ChatGPT.

Coding & Tech: Expert Questions

The toughest questions in the category, for true fans of the subject.

Q41. What is the worst-case time complexity of quick sort?

A. O(n log n)
B. O(n²)
C. O(log n)
D. O(n)

Answer: B. O(n²)

Explanation: With consistently bad pivots, quick sort degrades to O(n²).

Q42. Which algorithm finds shortest paths from one source in a graph with non-negative edge weights?

A. Kruskal's algorithm
B. Prim's algorithm
C. Floyd's cycle detection
D. Dijkstra's algorithm

Answer: D. Dijkstra's algorithm

Explanation: Dijkstra's algorithm computes single-source shortest paths with non-negative weights.

Q43. In the CAP theorem for distributed systems, what does the 'C' stand for?

A. Capacity
B. Concurrency
C. Consistency
D. Caching

Answer: C. Consistency

Explanation: CAP stands for Consistency, Availability and Partition tolerance.

Q44. At which OSI layer does the Internet Protocol (IP) operate?

A. Network layer (Layer 3)
B. Data link layer (Layer 2)
C. Transport layer (Layer 4)
D. Session layer (Layer 5)

Answer: A. Network layer (Layer 3)

Explanation: IP handles addressing and routing at the network layer.

Q45. At which OSI layer does TCP operate?

A. Network layer (Layer 3)
B. Application layer (Layer 7)
C. Physical layer (Layer 1)
D. Transport layer (Layer 4)

Answer: D. Transport layer (Layer 4)

Explanation: TCP provides reliable delivery at the transport layer.

Q46. How many layers does the OSI networking model have?

A. 4
B. 7
C. 5
D. 9

Answer: B. 7

Explanation: The OSI model has seven layers, from Physical to Application.

Q47. What is the default port for a MySQL server?

A. 3306
B. 5432
C. 1433
D. 27017

Answer: A. 3306

Explanation: MySQL listens on port 3306 by default.

Q48. What is the default port for a PostgreSQL server?

A. 3306
B. 6379
C. 5432
D. 8080

Answer: C. 5432

Explanation: PostgreSQL uses port 5432 by default.

Q49. Which port is used by DNS by default?

A. 25
B. 53
C. 67
D. 110

Answer: B. 53

Explanation: DNS queries use port 53.

Q50. What does 'JWT' stand for?

A. Java Web Tool
B. JavaScript Wrapped Transfer
C. JSON Wide Transport
D. JSON Web Token

Answer: D. JSON Web Token

Explanation: JWTs are compact signed tokens often used for authentication.

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