About this quiz
50 questions covering every section of the note: Types, Booting, Files and Shortcuts.
This Lok Sewa practice set has 50 multiple-choice questions (Subject: Computer Knowledge · For: Kharidar, Nayab Subba, Section Officer · Level: Easy). Take the quiz above first; after that, use the study list below to revise every question with its correct answer and a short explanation.
Study list: all 50 questions with answers and explanations
Which of these is system software?
- A) MS Word
- B) Windows ✔
- C) Google Chrome
- D) MS Excel
Why: Windows is an operating system, which is system software. The others are application programs.
Which of these is NOT a function of an operating system?
- A) Memory management
- B) File management
- C) Typing a letter ✔
- D) Device management
Why: Typing a letter is a job for an application such as MS Word, not the operating system.
MS-DOS is an example of which type of user interface?
- A) Graphical User Interface
- B) Command Line (Character) User Interface ✔
- C) Touch interface
- D) Voice interface
Why: In MS-DOS commands are typed, so it uses a character or command line interface.
Which operating system is mainly used where a response is needed within a fixed, very short time?
- A) Batch OS
- B) Real-time OS ✔
- C) Time-sharing OS
- D) Network OS
Why: Real-time operating systems are used in air traffic control, robots and similar systems.
Restarting a computer that is already switched on is called:
- A) Cold booting
- B) Warm booting ✔
- C) Shutting down
- D) Logging off
Why: A restart of a running computer is warm booting; starting from power off is cold booting.
POST, which runs when a computer starts, stands for:
- A) Power On Self Test ✔
- B) Program Output System Test
- C) Primary Operating System Task
- D) Power Off System Test
Why: POST is the Power On Self Test that checks the hardware during booting.
Which key combination deletes a file permanently without sending it to the Recycle Bin?
- A) Ctrl + Delete
- B) Alt + Delete
- C) Shift + Delete ✔
- D) Ctrl + D
Why: Shift + Delete skips the Recycle Bin and deletes the file permanently.
Which key is used to rename a selected file or folder in Windows?
- A) F1
- B) F2 ✔
- C) F5
- D) F7
Why: In Windows, select a file or folder and press F2 to rename it.
Which shortcut closes the active window or program?
- A) Alt + F4 ✔
- B) Ctrl + F4
- C) Alt + Tab
- D) Windows + D
Why: Alt + F4 closes the active window or program. Ctrl + F4 closes only a tab or document inside a program.
Which shortcut switches between open windows?
- A) Ctrl + Tab
- B) Alt + Tab ✔
- C) Shift + Tab
- D) Windows + L
Why: Alt + Tab switches between open windows. Ctrl + Tab switches tabs inside one program.
Windows key + L is used to:
- A) Log off permanently
- B) Lock the computer ✔
- C) Open File Explorer
- D) Show the desktop
Why: Windows + L locks the computer; you need the password to return.
Which shortcut opens Task Manager directly?
- A) Ctrl + Alt + Esc
- B) Ctrl + Shift + Esc ✔
- C) Alt + Shift + Del
- D) Ctrl + Esc
Why: Ctrl + Shift + Esc opens Task Manager directly, without the security screen.
A file named budget.xlsx was most likely created in:
- A) MS Word
- B) MS Excel ✔
- C) MS PowerPoint
- D) Notepad
Why: The .xlsx extension belongs to Microsoft Excel workbooks.
Which extension belongs to a program (executable) file?
- A) .exe ✔
- B) .pdf
- C) .txt
- D) .jpg
Why: Files ending in .exe are executable program files that Windows can run.
Which character is NOT allowed in a Windows file name?
- A) Hyphen (-)
- B) Underscore (_)
- C) Question mark (?) ✔
- D) Full stop (.)
Why: Characters such as ? * : " | / \ and the less-than and greater-than signs are not allowed in file names.
Deleted files from the hard disk are kept for restoring in the:
- A) Clipboard
- B) Recycle Bin ✔
- C) Control Panel
- D) Taskbar
Why: Files deleted from the hard disk go to the Recycle Bin, from where they can be restored.
Which utility joins the scattered parts of files on a hard disk to make it faster?
- A) Disk Cleanup
- B) Disk Defragmenter ✔
- C) Antivirus
- D) Backup
Why: The Disk Defragmenter rearranges file pieces so the disk reads them faster.
A small program that lets the operating system work with a printer is called a:
- A) Compiler
- B) Device driver ✔
- C) Virus
- D) Utility
Why: A device driver is a small program that lets the operating system control hardware such as a printer.
The Linux kernel was first written by:
- A) Bill Gates
- B) Steve Jobs
- C) Linus Torvalds ✔
- D) Dennis Ritchie
Why: Linus Torvalds wrote the first Linux kernel in 1991.
Which mobile operating system is based on the Linux kernel?
- A) iOS
- B) Android ✔
- C) Windows Phone
- D) Symbian
Why: Android is built on the Linux kernel.
Software whose source code anyone can see, change and share is called:
- A) Proprietary software
- B) Open source software ✔
- C) Shareware
- D) Malware
Why: Open source software, such as Linux, makes its source code freely available.
An operating system is a:
- A) System software ✔
- B) Application software
- C) Utility only
- D) Hardware
Why: An operating system is system software: it manages hardware and runs application programs.
Which of these is an operating system?
- A) Windows ✔
- B) MS Word
- C) Chrome
- D) Excel
Why: Windows is an operating system. Word, Chrome and Excel are application programs that run on it.
Which is an open-source OS?
- A) Linux ✔
- B) Windows
- C) macOS
- D) iOS
Why: Linux is open-source: its source code is free to use, change and share.
Android is developed mainly by:
- A) Google ✔
- B) Apple
- C) Microsoft
- D) IBM
Why: Android is developed mainly by Google.
iOS is the mobile OS of:
- A) Apple ✔
- B) Google
- C) Samsung
- D) Microsoft
Why: iOS is Apple's mobile operating system for the iPhone.
A GUI means:
- A) Graphical User Interface ✔
- B) General User Input
- C) Graphic Unit Interface
- D) Global User Internet
Why: GUI stands for Graphical User Interface: users work with icons, windows and a mouse.
MS-DOS uses a:
- A) Command line interface ✔
- B) Graphical interface
- C) Touch interface
- D) Voice interface
Why: MS-DOS uses a command line interface: users type commands.
Turning on a computer from off is called:
- A) Cold booting ✔
- B) Warm booting
- C) Logging off
- D) Formatting
Why: Starting a computer from the power-off state is cold booting. Restarting it is warm booting.
Ctrl + C is used to:
- A) Copy ✔
- B) Cut
- C) Paste
- D) Close
Why: Ctrl + C copies the selection to the clipboard.
Ctrl + X is used to:
- A) Cut ✔
- B) Copy
- C) Paste
- D) Undo
Why: Ctrl + X cuts the selection: it is removed and placed on the clipboard.
Ctrl + V is used to:
- A) Paste ✔
- B) Copy
- C) Cut
- D) Save
Why: Ctrl + V pastes what is on the clipboard.
Ctrl + Z is used to:
- A) Undo ✔
- B) Redo
- C) Zoom
- D) Close
Why: Ctrl + Z undoes the last action.
Ctrl + A is used to:
- A) Select all ✔
- B) Align
- C) Add
- D) Archive
Why: Ctrl + A selects everything in the current window or document.
Windows key + D is used to:
- A) Show the desktop ✔
- B) Delete files
- C) Open documents
- D) Disconnect
Why: Windows key + D minimises all windows and shows the desktop.
Windows key + E opens:
- A) File Explorer ✔
- B) Edge browser
- C) Excel
- D) Email
Why: Windows key + E opens File Explorer.
Ctrl + Alt + Delete is used to:
- A) Open security options / Task Manager ✔
- B) Delete files permanently
- C) Shut down instantly
- D) Format disk
Why: Ctrl + Alt + Delete opens the security options screen, with Lock, Sign out and Task Manager.
F5 in File Explorer or a browser is used to:
- A) Refresh ✔
- B) Rename
- C) Help
- D) Search
Why: F5 refreshes the current page or folder view.
F1 is generally used to open:
- A) Help ✔
- B) Rename
- C) Refresh
- D) Print
Why: F1 opens Help in most programs.
A folder in Windows is used to:
- A) Organise files ✔
- B) Delete files
- C) Run programs only
- D) Print files
Why: Folders organise files into groups so they are easy to find.
The file extension .docx belongs to:
- A) MS Word ✔
- B) MS Excel
- C) PowerPoint
- D) Notepad
Why: The .docx extension belongs to Microsoft Word documents.
The file extension .pptx belongs to:
- A) PowerPoint ✔
- B) Word
- C) Excel
- D) Paint
Why: The .pptx extension belongs to PowerPoint presentations.
The file extension .jpg is used for:
- A) Images ✔
- B) Videos
- C) Text
- D) Spreadsheets
Why: The .jpg (JPEG) extension is used for images such as photos.
The file extension .mp3 is used for:
- A) Audio ✔
- B) Video
- C) Images
- D) Documents
Why: The .mp3 extension is used for audio files.
Which utility is used to compress files?
- A) WinZip / 7-Zip ✔
- B) Notepad
- C) Paint
- D) Calculator
Why: WinZip and 7-Zip compress files into smaller archives such as .zip and .7z.
Antivirus software is used to:
- A) Detect and remove malware ✔
- B) Type documents
- C) Browse the web
- D) Print files
Why: Antivirus software detects and removes viruses and other malware.
Control Panel/Settings in Windows is used to:
- A) Change system settings ✔
- B) Write letters
- C) Play games
- D) Browse internet
Why: Control Panel and Settings are used to change system settings such as display, users and network.
Formatting a disk:
- A) Erases data and prepares the disk ✔
- B) Saves data
- C) Copies data
- D) Compresses data
Why: Formatting erases all data on a disk and prepares it with a new file system.
Multitasking means:
- A) Running several programs at once ✔
- B) Using one program only
- C) Turning off the PC
- D) Printing multiple copies
Why: Multitasking means running several programs at the same time.
The taskbar in Windows is usually at the:
- A) Bottom of the screen ✔
- B) Top of the screen
- C) Inside Word
- D) In BIOS
Why: The Windows taskbar is usually at the bottom of the screen, with the Start button and open programs.