Explanation

• A Modem (Modulator-Demodulator) converts digital signals into analog signals and vice versa.
• It is used to connect computers to the internet via telephone lines or other networks.

Additional information:

• Switch – connects multiple devices in a network
• Hub – basic network connector
• Repeater – boosts signal strength
• Router – directs internet traffic

Last verified on 19-04-2026

Explanation

• PowerPoint is used for Create presentations from scratch or a template.
• Add text, images, art, and videos.
• Select a professional design with PowerPoint Designer.

Last verified on 03-04-2026

Explanation

• Microsoft Excel is a spreadsheet program used to organize, calculate, and analyze data efficiently.
• It is widely used in offices, schools, and businesses for data management.

Additional information:

• Allows calculations using formulas and functions.
• Can create charts, graphs, and pivot tables for data analysis.
• Supports data sorting, filtering, and visualization.

Last verified on 17-01-2026

Explanation

F7

F7 does a spelling and grammar check in Microsoft Word

F1

Opens the help menu when pressed with the Windows button. 

F2

Allows you to edit the selected folder or file name in Windows Explorer & Cell 

F3

Opens search feature in Windows Explorer 

F4

Alt + F4 closes window 

F5

Starts slideshow in PowerPoint

Refreshes Internet browser pages 

F6

Goes to the next page in a split screen in Microsoft Word

F8

In Excel, enables extend mode for arrow keys

F9

Refreshes document in Microsoft Word

F10

Opens menu bar

F11

Exits and enters full-screen mode in browsers

F12

Opens Save as in Word

Explanation

• Ctrl + N shortcut key is used to create a new, blank document
• Save Document: Ctrl + SO
• Open Document: Ctrl + O
• Print Document: Ctrl + P (or Ctrl+F2 for Preview)
• Undo/Redo: Ctrl + Z (Undo),Ctrl + Y (Redo)
• Bold/Italic/Underline: Ctrl + B, Ctrl + I, Ctrl + U
• Center Alignment: Ctrl + E
• Insert Hyperlink: Ctrl + K
• Find/Replace: Ctrl + F (Find), Ctrl + H (Replace)

Last updated question by NA on 07 May 2026

Explanation

• The speed of a microprocessor is measured in Hertz (Hz).
• Hertz indicates the number of clock cycles per second.
• Modern processors are commonly measured in Gigahertz (GHz).

Additional information:

• Hertz (Hz): 1 cycle per second
• Kilohertz (kHz): 1,000 Hz
• Megahertz (MHz): 1,000,000 Hz
• Gigahertz (GHz): 1,000,000,000 Hz
• Terahertz (THz): 1,000,000,000,000 Hz

Last verified on 26-09-2026

Explanation

• Linux is based on open-source software.
• It is a Unix-like operating system.
• Created by: Linus Torvalds (1991).
• It is widely used in servers, mobile devices, and supercomputers.

Last updated 18-07-2026 by NA

Explanation

• ASCII: American Standard Code for Information Interchange
• Purpose: Character encoding standard
• Range: 0–127
• Represents: Letters, numbers & punctuation
• Work began: May 1961
• Definitive version: Published in 1968

Last updated by NA ON 16-09-2026

Explanation

• Laptop: A portable computer you can easily carry and use in different places.
• Battery-powered: Can operate without a direct power connection for a limited time.
• Smaller and lighter than a desktop computer.

Last updated by NA ON 16-09-2026

Explanation

• MICR stands for Magnetic Ink Character Recognition.
• It is a technology used mainly in the banking industry.
• It helps machines read and process checks quickly.

Last updated NA on 10-09-2026