Operating Systems Trivia
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99 free Operating Systems trivia questions with answers — science & nature quiz, new questions added Oct 2026.
An operating system is the software you never chose and cannot avoid: it decides what happens when you press the power button, how two apps share one processor, and why a crash looks the way it does. Its history is full of odd detail — a pun that named Unix, a chocolate bar that named a phone release, a big cat that named a Mac, and a Bell Labs project whose title came from a terrible 1950s film. These 99 questions cover the lineage of Windows and MS-DOS, the Mac from its first OS X release to the year-numbered versions of 2025, the Linux distributions and the Unix ideas beneath Android, iOS and ChromeOS, and the plain-English concepts a first-year computing course teaches: multitasking, memory tricks, file systems, shells and the crash that is not a blue screen. Every answer comes with a one-line explanation that adds something beyond the question. Play it to find out whether you know the machine you use all day, hand it to a computing class as a revision round, or print it for a pub quiz with a technical table.
30 of 99 questions with answers and explanations. Play the quiz
Q 01The 'DOS' in MS-DOS, the command-line software Microsoft first shipped for PCs in 1981, was short for what?
Disk Operating System
Disk Operating System was a generic phrase, and the very same code also shipped on the original PC under the badge PC DOS, with rival clones borrowing the name too.
Q 02MS-DOS reserved the drive letters A: and B: for which hardware, leaving C: for the first hard drive?
Floppy drives
Floppy drives came first because early PCs often had two of them and no hard drive at all, and Windows has honoured the leftover C: ever since.
Q 03Android 4.4 was co-branded with which chocolate bar under a promotional deal struck with Nestlé?
KitKat
KitKat was agreed in a phone call to Nestlé and sealed at Mobile World Congress in February 2013, and in the US the bar is actually made by Hershey under licence.
Q 04Which big cat codenamed Mac OS X 10.0, the 2001 release that began Apple's run of feline version names?
Cheetah
Cheetah belied its name: reviewers found 10.0 slow and unfinished, without even DVD playback, and six months later Apple made the 10.1 upgrade free to everyone who owned it.
Q 05Android Inc., bought by Google in 2005, originally set out to build an OS for which devices?
Digital cameras
Digital cameras were the plan: a platform for 'smart cameras' that linked to PCs. The team then reworked the very same system for phones as the smartphone market took off.
Q 06Windows 10 was offered as a free upgrade for its first year to owners of which earlier versions?
7, 8 and 8.1
7, 8 and 8.1 owners got twelve months to upgrade free, part of Microsoft's aim of a billion devices on Windows 10 within three years, a mark it reached only in March 2020.
Q 07Which Apple utility, shipped with Mac OS X Leopard, restarts an Intel Mac into a full copy of Windows?
Boot Camp
Boot Camp only ever made sense on Intel chips, and Apple dropped it entirely for Apple silicon Macs, which can run ARM Windows only inside a virtual machine.
Q 08Which Mac OS X Leopard backup feature lets users scroll back through hourly snapshots of their files?
Time Machine
Time Machine keeps hourly backups for a day, daily ones for a month and weekly ones beyond that, then quietly deletes the oldest when the backup drive fills up.
Q 09Chromebooks outsold Apple's Macs over a full year for the first time in 2020, lifted by a boom in what?
Remote schooling
Remote schooling had districts and parents buying over 30 million Chromebooks in 2020. The Mac's own share grew that year, so those sales came mostly out of cheap Windows laptops.
Q 10Apple's 2025 jump from iOS 18 straight to iOS 26 arrived with which translucent new interface design?
Liquid Glass
Liquid Glass came with a renumbering: Apple named every one of its systems 26, after the year ahead, so that the iPhone, Mac, iPad, Watch and TV software finally share one number.
Q 11Windows 11's 2021 requirements excluded millions of capable PCs by demanding version 2.0 of which security chip?
Trusted Platform Module
Trusted Platform Module 2.0 keeps encryption keys and sign-in credentials behind a hardware barrier, and Microsoft called it a 'critical building block' for its Windows Hello and BitLocker protections.
Q 12Which two makers shipped the first Chromebooks in June 2011, weeks after Google unveiled them at its I/O conference?
Samsung and Acer
Samsung and Acer got there first because Google's own Cr-48 test laptop of 2010 was only ever given away to pilot users and never sold.
Q 13Microsoft's 2016 Anniversary Update let PC users run a real bash shell natively via which new compatibility layer?
Q 21Microsoft's own 1991 video said the initials of Windows NT, its 32-bit line launched in 1993, stood for what?
New Technology
New Technology was the gloss in a 1991 Bill Gates video, but by 1998 Gates was saying the letters no longer carried any specific meaning at all.
Q 22Which real-time operating system from Wind River ran NASA's Curiosity rover and the Mars Reconnaissance Orbiter?
VxWorks
VxWorks also ran Mars Pathfinder in 1997, when engineers reproduced the lander's repeated computer resets on a duplicate on Earth and cured them with a software patch sent to Mars.
Q 23Unix began as a pared-down answer to which sprawling time-sharing project that Bell Labs had just walked away from?
Multics
Windows Subsystem for Linux
Windows Subsystem for Linux at first implemented Linux system calls inside the Windows kernel; WSL 2, announced in 2019, switched to running a real Linux kernel in a lightweight virtual machine.
Q 14Which Linux distribution has Mark Shuttleworth's company Canonical bankrolled since its first release in 2004?
Ubuntu
Ubuntu, a Nguni word for humanity, was paid for out of the fortune Shuttleworth made selling his internet-security firm to VeriSign, money that had already bought him a ride into orbit.
Q 15Which company agreed in October 2018 to buy Red Hat, the enterprise Linux firm, for about $34 billion?
IBM
IBM closed the deal in July 2019 and kept Red Hat as a separate unit, pledging to preserve its independence and neutrality so that it could go on working with IBM's rivals.
Q 16FAT32, the file system commonly used on USB sticks, cannot hold a single file larger than what size?
4 GB
4 GB minus one byte is the ceiling, which is why one large video file refuses to copy onto a FAT32 stick until it is reformatted as exFAT, FAT's successor.
Q 17Which multitasking scheme let one hung program freeze the whole machine on classic Mac OS and 16-bit Windows?
Cooperative
Cooperative multitasking relies on each program voluntarily yielding the CPU; Windows 95 and Mac OS X both moved on to preemptive scheduling, in which the system forcibly shares out the time.
Q 18Edsger Dijkstra's dining philosophers puzzle, five thinkers sharing five forks, illustrates which multitasking hazard?
Deadlock
Deadlock strikes when every philosopher grabs the fork on the left and waits forever for the right one, and operating systems face the same trap with locks on files and memory.
Q 19Which technique, pioneered on Manchester's Atlas computer, parks a program's idle pages on disk until needed?
Virtual memory
Virtual memory lets programs address more RAM than is physically installed, and when a machine spends most of its time shuffling pages in and out the condition is called thrashing.
Q 20What do Linux and macOS call the fatal crash that Windows users know as the blue screen of death?
Kernel panic
Kernel panic takes its name from the routine itself: since the earliest editions of Unix, the core of the system has called a function named panic when it hits an error it cannot recover from.
Multics was a joint venture of Bell Labs, General Electric and MIT; the Bell researchers who quit it built a small replacement whose name, Unix, puns on it.
Q 24Ken Thompson's wish to keep playing which game of his own on a spare Bell Labs minicomputer helped spark Unix in 1969?
Space Travel
Space Travel simulated a flight through the solar system, and rewriting it for a cast-off PDP-7 is how Thompson came to write the first pieces of Unix.
Q 25In 1992 Andrew Tanenbaum declared 'Linux is obsolete' on Usenet because Torvalds had spurned which design for its core?
Microkernel
Microkernel designs push drivers and file systems out of the privileged core, as Tanenbaum's own teaching system did, yet the monolithic Linux went on to win the world.
Q 26Bell Labs named its Unix successor 'Plan 9' after a cult film by which director, often called the worst ever?
Ed Wood
Ed Wood's Plan 9 from Outer Space supplied the title; the system's lasting gift is UTF-8, which Ken Thompson sketched for it on a diner placemat in 1992.
Q 27Bash, the default command shell on most Linux systems, is a pun on the surname of which earlier shell's author?
Stephen Bourne
Stephen Bourne wrote the sh that shipped with Version 7 Unix in 1979, and Brian Fox's 1989 'Bourne Again SHell' was the GNU project's free replacement for it.
Q 28The Unix command 'sudo', which runs a single command with administrator rights, was originally short for what?
Superuser do
Superuser do stopped fitting once sudo learned to run a command as any account, not only the all-powerful root, so the project itself now reads the name as su 'do'.
Q 29In preemptive multitasking, what is the term for the few milliseconds a process gets before the scheduler moves on?
Time slice
Time slice, also called a quantum, is what a frozen program can no longer hog: when it expires the core forcibly hands the processor to the next process in line.
Q 30Bill Gates said in 2013 that using Ctrl+Alt+Delete for which Windows task was a mistake, having wanted a single button?
Logging in
Logging in: Ctrl+Alt+Delete was devised by engineer David Bradley as a quick way to restart the original PC, and Gates said the keyboard's designer had refused him a dedicated button.