All Free Computer Science and IT MCQs with Answers

21. What is the largest SI unit of memory and is equal to___________?

• A. Gigabyte = 1000 megabytes
• B. Exabyte = 1000 Petabytes
• C. Yottabyte= 1000 Zettabyte
• D. Zettabyte = 1000 Exabyte

Explanation: Yottabyte is the largest named SI decimal unit in the options, and 1 yottabyte equals 1000 zettabytes. The binary-based units used in computing differ from these decimal SI conversions.

22. A computer cannot "boot" if it does not have the _____system.?

• A. Compiler
• B. Loader
• C. Operating
• D. Assembler

Explanation: A computer needs an operating system to manage hardware and provide the environment in which programs run during booting. A loader, compiler, and assembler are supporting programs, not the essential system named here.

23. Window 9 main features are ________?

• A. Windows 9 Has a New Look
• B. Windows 9 Snap Layouts
• C. Multiple Desktops in Windows 9
• D. Window 9 Not launched

Explanation: Microsoft did not release Windows 9; it moved from Windows 8.1 to Windows 10, partly to distinguish the new version from older Windows 9x software. Therefore the listed Windows 9 features do not apply.

24. To minimize the all windows in desktop shortcut key is _________?

• A. Windows+A
• B. Windows+M
• C. Windows+N
• D. Windows+A

Explanation: Windows+M minimizes all open windows and displays the desktop. The Windows+A shortcut is duplicated in the options and is not the standard command for this action.

25. First boot sector virus is __________?

• A. computed
• B. mind
• C. brian
• D. None of These

Explanation: Brain, also called the Brain boot-sector virus, is widely identified as the first IBM PC boot-sector virus. The other names do not identify that historically recognised virus.

26. _________ are often delivered to a PC through an email attachment and are often designed to do harm.

• A. Viruses
• B. Spam
• C. Portals
• D. None of These

Explanation: Viruses are malicious programs that may be attached to email files and execute when the attachment is opened. Spam is unwanted communication, but it is not itself necessarily a harmful program.

27. Date and time are displayed on _________?

• A. Status bar
• B. Task bar (system tray)
• C. Menu Bar
• D. Launch pad

Explanation: The system tray is part of the taskbar and commonly displays the clock and date along with notification icons. The status bar and menu bar belong to application windows and do not normally show the system date and time.

28. There are _______ cards in a standard deck of cards?

• A. 36
• B. 44
• C. 52
• D. 54Spreadsheet Software

Explanation: A standard deck contains 52 cards, divided into four suits of 13 cards each. The number 54 applies only when two jokers are included.

29. Which short key is used for close program?

• A. ctrl + F4
• B. alt + F4
• C. shift + F4
• D. None of These

Explanation: Alt+F4 closes the active program or window in Windows. Ctrl+F4 usually closes only the current document or tab within a program.

30. What is the most popular system in the shorthand?

• A. Sloan Duployan System.
• B. Pitman Shorthand
• C. John Robert Gregg's System
• D. Morse Code

Explanation: Pitman Shorthand is traditionally regarded as the most popular shorthand system among the listed choices. Gregg's system is also widely known, but the question's conventional answer is Pitman.