CompTIA A+ Core 1 Practice Questions: Operating Systems

26 free, exam-style CompTIA A+ Core 1 (220-1101) practice questions covering Operating Systems. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.

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Q1. What is the purpose of the chkdsk utility?

Explanation: chkdsk checks the file system and disk surface for errors. Learn more.

Q2. Which Windows utility would you use to partition a hard drive?

Explanation: Disk Management is used to create, format, and manage disk partitions. Learn more.

Q3. What is the purpose of the Windows Performance Monitor?

Explanation: Performance Monitor tracks system metrics like CPU, memory, disk, and network usage. Learn more.

Q4. What is the purpose of the Windows Disk Defragmenter?

Explanation: Disk Defragmenter reorganizes fragmented data on HDDs for better performance. Learn more.

Q5. Which command is used to check disk health in Windows?

Explanation: chkdsk scans for file system errors and bad sectors. Learn more.

Q6. What is the purpose of the 'gpupdate /force' command?

Explanation: gpupdate /force immediately refreshes Group Policy settings. Learn more.

Q7. What is the purpose of the 'chkdsk /f' command?

Explanation: 'chkdsk /f' fixes errors on the disk. Learn more.

Q8. What is the purpose of the 'hostname' command?

Explanation: hostname shows the computer's network name. Learn more.

Q9. What is the purpose of the 'date' command?

Explanation: date displays or changes the system date. Learn more.

Q10. What is the macOS equivalent of the Windows Device Manager?

Explanation: System Information (Apple Menu > About This Mac > System Report) lists hardware details. Learn more.

Q11. Which Windows feature allows running Linux distributions natively?

Explanation: WSL lets users run Linux binaries directly on Windows. Learn more.

Q12. Which command displays CPU and memory usage in Linux?

Explanation: 'top' shows real-time system stats (like Task Manager in Windows). Learn more.

Q13. What is the purpose of the 'journalctl' command?

Explanation: 'journalctl' queries logs managed by systemd. Learn more.

Q14. What is the purpose of the 'df' command in Linux?

Explanation: The `df` command displays the amount of disk space used and available on mounted filesystems. It’s helpful for identifying storage issues and ensuring sufficient space for operations. Use `df -h` for human-readable output in MB/GB. Learn more.

Q15. What is the purpose of the 'ps' command in Linux?

Explanation: The `ps` (process status) command provides a snapshot of currently running processes. Common options like `ps aux` give detailed information including process ID (PID), CPU/memory usage, and command names. It's often used in troubleshooting performance issues. Learn more.

Q16. What is the purpose of the 'top' command in Linux?

Explanation: `top` is a real-time Linux utility that displays system performance metrics like CPU usage, memory consumption, running processes, and system uptime. It's useful for identifying resource-intensive tasks and diagnosing performance issues. Learn more.

Q17. Which Windows tool would you use to check for driver updates?

Explanation: Device Manager in Windows lets you view and manage hardware devices. By right-clicking on a device and selecting 'Update driver,' you can check for new drivers locally or online. This is a standard method for resolving hardware compatibility issues or improving performance. Learn more.

Q18. What is the purpose of the chkdsk utility?

Explanation: CHKDSK (Check Disk) scans your drive for logical file system errors and physical bad sectors. It can repair issues such as lost clusters, cross-linked files, or directory errors, helping restore drive integrity and performance without data loss. Learn more.

Q19. What is the minimum RAM requirement for 64-bit Windows 10?

Explanation: Microsoft's official minimum is 2 GB for 64-bit Windows 10. Learn more.

Q20. Which file system is preferred for USB flash drives in Windows?

Explanation: exFAT supports large files (>4GB) and is compatible with both Windows and macOS. Learn more.

Q21. Which Windows utility would you use to partition a hard drive?

Explanation: Disk Management is a built-in Windows tool (accessible via 'diskmgmt.msc') that allows users to create, delete, format, and resize partitions on hard drives and SSDs. It’s useful for preparing new disks or reconfiguring existing ones without data loss. Learn more.

Q22. What is the purpose of the System Restore feature in Windows?

Explanation: System Restore allows users to roll back system files, registry settings, installed programs, and Windows updates to a previously saved 'restore point'—helping recover from system instability without affecting personal files. Learn more.

Q23. Which Windows startup mode loads only essential drivers and services, and is useful for troubleshooting system stability issues?

Explanation: Safe Mode starts Windows in a basic state, using a limited set of files and drivers. It can help you troubleshoot problems on your PC, as if a problem doesn't happen in Safe Mode, you know default settings and basic device drivers aren't causing the issue. Learn more.

Q24. Which macOS utility is used for creating full system backups?

Explanation: Time Machine is the built-in backup feature of macOS. It keeps local snapshots and backups on external drives to restore files or the entire system. Learn more.

Q25. Which Linux command is used to change the permissions of a file or directory?

Explanation: chmod (change mode) is used to change the access permissions of file system objects (files and directories) in Unix-like systems. Learn more.

Q26. Which file extension is associated with a PowerShell script?

Explanation: PowerShell scripts use the .ps1 file extension. .bat is for Batch files, .sh for Shell scripts, and .py for Python. Learn more.

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