MS-DOS is an operating system with which of the following type of user interface?

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Correct — C, Command-based Interface. MS-DOS (Microsoft Disk Operating System, from 1981) has no windows, icons or mouse pointer. The user types instructions at a prompt such as C:\> — DIR, COPY, DEL, CD, FORMAT — and the command interpreter COMMAND.COM carries them out. It is a single-user, single-tasking command-line (CLI) operating system; the graphical desktop arrived later, with Windows running on top of it.

Why the other options are wrong — (a) A GUI means windows, icons, menus and a pointer — that describes Windows, macOS or a Linux desktop. Early Windows versions in fact ran on top of MS-DOS precisely to supply the graphical layer DOS lacked.  (b) Touch interfaces belong to smartphones and tablets (Android, iOS) of the late 2000s onwards; MS-DOS predates them by decades and had no touch support.  (d) Voice interfaces rely on modern speech recognition (voice assistants). MS-DOS accepted only commands typed at the keyboard.

Concept: A user interface is how a person instructs a machine, and four families are usually listed: command-line (type exact commands — MS-DOS, UNIX/Linux shells, Windows cmd and PowerShell), graphical (windows, icons, menus, pointer — Windows, macOS, GNOME), touch (Android, iOS) and voice (speech assistants). A CLI demands exact syntax and is unforgiving for beginners, but it is fast, scriptable and very light on hardware — which is why command lines never disappeared even on graphical systems.

State PCS 2025 Q50 — Science & Technology PYQ with Answer

State PCS 2025 Q50 — Science & Technology PYQ with Answer