IT | Operating Systems |Windows, Linux, Unix, macOS, Android, iOS.
Operating Systems – 50 One-Liner Q&A
Basics of OS
Q.1. What is an Operating System (OS)?
Ans. Software that manages computer hardware and software resources.
Q.2. Main functions of OS?
Ans. Process management, memory management, file management, I/O control.
Q.3. Examples of popular operating systems?
Ans. Windows, Linux, Unix, macOS, Android, iOS.
Q.4. OS works as an interface between?
Ans. User and Computer Hardware.
Q.5. What are the two main types of OS interfaces?
Ans. CLI (Command Line Interface) and GUI (Graphical User Interface).
Windows OS
Q.6. Who developed Windows OS?
Ans. Microsoft.
Q.7. Which was the first Windows OS?
Ans. Windows 1.0 (1985).
Q.8. Which Windows introduced the Start Menu?
Ans. Windows 95.
Q.9. Which Windows OS is most widely used today?
Ans. Windows 10/11.
Q.10. What is NT in Windows NT?
Ans. New Technology.
Linux OS
Q.11. Who developed Linux?
Ans. Linus Torvalds (1991).
Q.12. Linux is based on which OS?
Ans. Unix.
Q.13. What type of software is Linux?
Ans. Open-source Operating System.
Q.14. What is the kernel in Linux?
Ans. Core part of the OS managing system resources.
Q.15. Examples of Linux distributions?
Ans. Ubuntu, Fedora, Debian, Red Hat.
Unix OS
Q.16. Who developed Unix?
Ans. Ken Thompson and Dennis Ritchie at AT&T Bell Labs (1969).
Q.17. Unix is written in which language?
Ans. C Language.
Q.18. Unix is known for what main feature?
Ans. Multitasking and Multiuser capability.
Q.19. What type of OS is Unix?
Ans. Time-sharing operating system.
Q.20. What is the default shell in Unix?
Ans. Bourne Shell (sh).
macOS
Q.21. macOS is developed by?
Ans. Apple Inc.
Q.22. macOS is based on which Unix variant?
Ans. BSD Unix.
Q.23. What was the first version of macOS called?
Ans. Mac OS X (2001).
Q.24. Which file system does macOS use?
Ans. APFS (Apple File System).
Q.25. Which hardware does macOS mainly run on?
Ans. Apple’s Macintosh computers.
Android OS
Q.26. Who developed Android originally?
Ans. Android Inc. (later acquired by Google in 2005).
Q.27. Android is based on which OS kernel?
Ans. Linux Kernel.
Q.28. Which was the first Android version?
Ans. Android 1.0 (2008).
Q.29. Android apps are mainly written in which languages?
Ans. Java, Kotlin.
Q.30. Google Play Store is associated with which OS?
Ans. Android.
iOS
Q.31. Who developed iOS?
Ans. Apple Inc.
Q.32. iOS was first released in which year?
Ans. 2007 (with the first iPhone).
Q.33. iOS apps are developed using which languages?
Ans. Swift and Objective-C.
Q.34. What is the iOS app store called?
Ans. Apple App Store.
Q.35. iOS is based on which Unix variant?
Ans. Darwin (BSD Unix-based).
General OS Concepts
Q.36. What is multitasking in OS?
Ans. Running multiple tasks at the same time.
Q.37. What is multiprocessing?
Ans. Running processes on multiple CPUs simultaneously.
Q.38. What is a device driver?
Ans. Software that allows OS to communicate with hardware devices.
Q.39. What is a file system?
Ans. Method OS uses to store and organize files (e.g., NTFS, FAT32, ext4).
Q.40. What is a process in OS?
Ans. An instance of a program in execution.
Q.41. What is a thread?
Ans. The smallest unit of a process that can be executed.
Q.42. What is a deadlock in OS?
Ans. Situation where two or more processes wait indefinitely for resources.
Q.43. What is a kernel mode?
Ans. Privileged mode where OS executes critical instructions.
Q.44. What is a user mode?
Ans. Restricted mode where user applications run.
Q.45. Example of real-time OS?
Ans. VxWorks, QNX, RTLinux.
Security & Updates
Q.46. What is system call in OS?
Ans. Interface for programs to request services from OS.
Q.47. What is patch in OS?
Ans. Update to fix bugs or vulnerabilities.
Q.48. What is sandboxing in OS?
Ans. Running applications in an isolated environment for security.
Q.49. Which OS is widely used in servers?
Ans. Linux/Unix.
Q.50. Which OS powers iPhones and iPads?
Ans. iOS.
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