कम्प्युटर अपरेटर परीक्षाको पाठ्यक्रममा ओपरेटिङ सिस्टम (Operating System) खण्ड अन्तर्गत विशेष गरी MS-DOS र Windows OS बाट धेरै प्रश्नहरू सोधिन्छन्। कमान्ड प्रम्प्ट (Command Prompt) र विन्डोजका सेटिङहरू सम्बन्धी ज्ञान परीक्षार्थीका लागि निकै फलदायी हुन्छ।
यस लेखमा ओपरेटिङ सिस्टमका ३० वटा महत्वपूर्ण पुराना र नयाँ प्रश्नहरू संकलन गरिएको छ।
### Operating System - Top 30 MCQs
**१. Which of the following is the main function of an Operating System?**
Answer: Resource Management, Process Management, File Management (All of the above)
**२. MS-DOS is a:**
Answer: Command Line Interface (CLI) / Single-user Operating System
**३. Which DOS command is used to display the list of files and folders in the current directory?**
Answer: DIR
**४. In MS-DOS, which command is used to create a new directory?**
Answer: MD (Make Directory)
**५. Which of the following is an Internal Command in MS-DOS?**
Answer: CLS, COPY, TYPE, DATE
**६. Which DOS command is used to clear the screen?**
Answer: CLS
**७. Format, CHKDSK, and DISKCOPY are examples of which DOS commands?**
Answer: External Commands
**८. What is the full form of FAT in file systems?**
Answer: File Allocation Table
**९. Which file system is default and standard for modern Windows operating systems?**
Answer: NTFS (New Technology File System)
**१०. What is the shortcut key to permanently delete a selected item in Windows without moving it to the Recycle Bin?**
Answer: Shift + Delete
**११. Which Windows tool allows users to change system settings, add/remove programs, and manage hardware?**
Answer: Control Panel
**१२. What is the core or heart of an operating system called?**
Answer: Kernel
**१३. The first screen that appears after the computer boots up is called:**
Answer: Desktop
**१४. Which command in Windows Run dialog box is used to open the Registry Editor?**
Answer: regedit
**१५. What is the maximum length of a file name in Windows operating systems?**
Answer: 255 characters
**१६. Which program runs automatically when a computer is idle for a specified period?**
Answer: Screen Saver
**१७. What is the shortcut key to switch between open applications in Windows?**
Answer: Alt + Tab
**१८. In Windows, which folder stores files and folders that are deleted?**
Answer: Recycle Bin
**१९. Which type of booting occurs when the computer is turned on from a completely off state?**
Answer: Cold Booting
**२०. What is the full form of GUI?**
Answer: Graphical User Interface
**२१. Which command is used in MS-DOS to rename a file?**
Answer: REN
**२२. In Windows, which tool displays real-time information about CPU, memory, and disk usage?**
Answer: Task Manager
**२३. What is the shortcut key to minimize all open windows and show the desktop?**
Answer: Windows Key + D
**२४. Which DOS file contains internal commands and executes automatically during booting?**
Answer: COMMAND.COM
**२५. Virtual memory is typically located on:**
Answer: Hard Drive / SSD
**२६. Which feature of Windows 10/11 allows you to organize open windows into separate grid positions?**
Answer: Snap Assist
**२७. What is the command to check the current version of DOS?**
Answer: VER
**२८. Which software acts as an interface between user applications and computer hardware?**
Answer: Operating System
**२९. What is the shortcut key to lock your Windows PC instantly?**
Answer: Windows Key + L
**३०. Which utility program reorganizes fragmented data on a hard drive to improve performance?**
Answer: Defragment and Optimize Drives
### निष्कर्ष
विन्डोज र डस (DOS) को कन्सेप्ट बुझ्दा प्राक्टिकल काम र लिखित परीक्षा दुवै सहज बन्छ। परीक्षाको राम्रो तयारीका लागि यी प्रश्नहरू बारम्बार दोहोर्याउनुहोस्।