Basic Computer Skills: 50 MCQ Quiz
Basic Computer Skills MCQs with Answers

Basic Computer Skills MCQ Quiz (50 Questions)

This collection of Basic Computer Skills MCQs with answers helps you prepare for computer literacy tests, competitive exams, and job assessments. Each question includes a clear explanation to help you learn quickly and confidently.

1. What does Ctrl + Z generally do?
Correct Answer: B Explanation: Ctrl + Z is the common keyboard shortcut for undoing the most recent action in many programs.
2. Can you undo more than one step in most programs?
Correct Answer: B Explanation: Most modern applications maintain an undo history allowing several steps to be undone.
3. What is Redo used for?
Correct Answer: A Explanation: Redo reinstates the action that was undone, restoring the change.
4. Does Undo work in all programs?
Correct Answer: B Explanation: Undo must be implemented by the software; not all programs support it.
5. What is the Undo button symbol usually shown as?
Correct Answer: B Explanation: Many apps use a left-pointing curved arrow to indicate Undo.
6. What is a file extension?
Correct Answer: A Explanation: Extensions like .pdf, .jpg, .docx tell the system how to open the file.
7. Why are some file extensions hidden by default?
Correct Answer: A Explanation: Hiding extensions reduces accidental changes that could make a file unusable.
8. Can you change a file extension manually?
Correct Answer: A Explanation: Changing extensions doesn't actually convert file content and may break association with programs.
9. How can you tell if a downloaded file is likely safe?
Correct Answer: B Explanation: Files from reputable sites and scanned by security tools are generally safer.
10. What is the difference between downloading and uploading?
Correct Answer: B Explanation: Download brings data to your device; upload sends your data to a remote server or service.
11. Can you download or upload without an internet connection?
Correct Answer: B Explanation: Network transfer requires connectivity, though you can copy files locally (USB) without internet.
12. Is it safe to download files from any website?
Correct Answer: B Explanation: Untrusted sites may host malware; verify source and scan files before opening.
13. What are some common file types for uploading?
Correct Answer: A Explanation: Common upload formats include images (JPG/PNG), documents (PDF), and audio (MP3).
14. What is free software?
Correct Answer: B Explanation: Free software is distributed at no cost, though "free" can mean freedom to use or just price-free.
15. Is free software always safe?
Correct Answer: B Explanation: Safety depends on who provides it and how well it's maintained and reviewed.
16. Can free software replace paid software?
Correct Answer: B Explanation: Some free/open-source tools (like GIMP or LibreOffice) match paid alternatives.
17. How do developers earn from free software?
Correct Answer: B Explanation: Monetization strategies include paid services, dual licensing, donations, and ads.
18. What is the main difference between open source and closed source software?
Correct Answer: B Explanation: Open-source projects allow users to view and modify source code; closed-source is proprietary.
19. Can you modify open source software?
Correct Answer: A Explanation: Open-source licenses generally permit modification for improvement or customization.
20. Is open source always free of charge?
Correct Answer: B Explanation: Some open-source software may have paid enterprise versions or support services.
21. Why might someone choose closed source software?
Correct Answer: A Explanation: Businesses often prefer closed-source products for professional vendor support and accountability.
22. Which type is generally better for beginners?
Correct Answer: A Explanation: Commercially supported software often has more user-friendly documentation and intuitive interfaces.
23. What does PDF stand for?
Correct Answer: A Explanation: PDF is a file format for presenting documents independent of software or hardware.
24. Are PDFs free to open?
Correct Answer: A Explanation: Many free PDF readers (and web browsers) can open PDF files without cost.
25. Can you password-protect a PDF?
Correct Answer: A Explanation: PDF security features include encryption and password-protection to restrict viewing or editing.
26. How do you convert a Word document to PDF?
Correct Answer: B Explanation: Renaming an extension doesn't change the file type; you must use an Export or Save As function.
27. Can PDFs be compressed to reduce file size?
Correct Answer: B Explanation: Compression tools reduce image quality or remove metadata to make PDF files smaller for emailing.
28. Do you need a separate router if you have a modem with Wi-Fi?
Correct Answer: B Explanation: ISPs often supply a "Gateway" device that combines modem and router functions into one box.
29. How can you secure your Wi-Fi?
Correct Answer: A Explanation: Strong encryption (WPA2/3) and changing default admin credentials are essential for network security.
30. Can multiple devices connect to the same Wi-Fi at once?
Correct Answer: B Explanation: Routers are designed to manage multiple connections by sharing the available bandwidth.
31. How far does typical home Wi-Fi reach?
Correct Answer: A Explanation: Walls, floors, and other electronic interference significantly reduce Wi-Fi range.
32. Why should you update your software regularly?
Correct Answer: A Explanation: Security patches in updates protect your system from newly discovered threats.
33. Can you skip updates if your system seems fine?
Correct Answer: A Explanation: Even if the computer "feels" fine, unpatched vulnerabilities can be exploited by hackers.
34. How do you know which apps need updates?
Correct Answer: A Explanation: Modern OSes like Windows and macOS have central notification systems for pending updates.
35. Do updates affect your personal files?
Correct Answer: A Explanation: Updates target system files, but a crash during update could lead to data loss, making backups vital.
36. Can you use any image from the internet as your desktop background?
Correct Answer: B Explanation: While technically possible, you should use images you own or those licensed for public use.
37. Can you set a slideshow of images as wallpaper?
Correct Answer: A Explanation: Windows and macOS have "Personalization" settings to rotate through a folder of images.
38. Can you use personal photos as your desktop background?
Correct Answer: A Explanation: Any common image format (.jpg, .png) that you have on your drive can be set as a background.
39. What is a computer virus?
Correct Answer: B Explanation: Viruses are a form of malware that "infect" other files and can spread between computers.
40. How can you remove a virus?
Correct Answer: A Explanation: Antivirus software scans the system to identify and quarantine or delete malicious code.
41. Can viruses return after removal?
Correct Answer: B Explanation: If you keep visiting unsafe sites or don't patch the OS, your computer can be re-infected.
42. Should you contact a professional if virus removal is difficult?
Correct Answer: A Explanation: Deeply embedded malware (rootkits) may require specialized knowledge to remove safely.
43. If a printer is not working, what's a first simple step?
Correct Answer: A Explanation: Physical issues (loose cables, no paper) are the most common cause of printer failure.
44. Why might prints be faded or light?
Correct Answer: A Explanation: Faded prints indicate that the printer needs fresh ink/toner or a cleaning cycle.
45. If you need model-specific help for a device, what is best?
Correct Answer: A Explanation: Manufacturers provide specific drivers and troubleshooting guides for each model.
46. Why disable startup programs?
Correct Answer: A Explanation: Too many programs launching at once can cause the computer to be slow immediately after login.
47. Can you disable antivirus or system programs safely?
Correct Answer: A Explanation: You should only disable security apps temporarily while troubleshooting a specific problem.
48. Will disabling startup programs delete them?
Correct Answer: A Explanation: The programs stay on your hard drive; they just won't run until you manually open them.
49. How do you know which programs are safe to disable at startup?
Correct Answer: A Explanation: Utility updaters and cloud sync apps are usually safe to disable; critical drivers are not.
50. What is the best upgrade for an old computer to improve performance?
Correct Answer: A Explanation: SSDs are significantly faster than mechanical hard drives, providing the most noticeable speed boost.

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