Explanation

• USB stands for Universal Serial Bus.
• It allows communication and data transfer between a computer and peripheral devices.
• Common USB devices include mouse, keyboard, printer, scanner, and external hard drive.

Last verified on 29-09-2026

Explanation

• The Motherboard is the main circuit board of a computer.
• It holds or provides connections for the CPU, RAM, ROM, and expansion cards.
• It allows different computer components to communicate with each other.

Additional information:

• CPU → Processes instructions
• RAM → Temporary memory
• ROM → Stores permanent/basic instructions
• Expansion cards → Add extra functions to a computer

Last verified on 29-09-2026

Explanation

• A keyboard is an input device.
• Mainly used to enter text, numbers, and commands.
• Contains alphabetic, numeric, and function keys.
• Common shortcut keys include Ctrl, Alt, Shift, and Enter.

Explanation

• Data transmission means sending and receiving data through a transmission medium.
• It allows information to move from one device to another.
• Transmission media can be wired or wireless.
• Wired: Twisted-pair cable, coaxial cable, fiber-optic cable.
• Wireless: Radio waves, microwaves, infrared, and satellite communication.

Last verified on 28-09-2026

Explanation

• Monitor, Printer, and Headphones are all output devices.
• Output devices present or produce information from a computer for the user.

Additional information:

• Monitor: Displays text, images, and videos.
• Printer: Produces information on paper.
• Headphones: Produce audio or sound output.

Last verified on 28-09-2026

Explanation

• An operating system manages computer hardware and software resources.
• It uses hardware efficiently and provides services to applications.
• It allows programs to run smoothly and interact with hardware.
• It acts as an interface between users, applications, and hardware.

Last verified on 08-06-2026

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

• Keyboard → An input device used to enter data and commands.
• Inventor: Christopher Latham Sholes
• Function keys: 12 (F1–F12)
• Alphanumeric keys: A–Z and 0–9
• Punctuation keys: Comma, period, semicolon, etc.
• Special keys: Arrow keys, Caps Lock, Enter, Ctrl, Alt
• Longest key: Spacebar
• Standard keyboard: 101 keys

Explanation

• Intelligent Device: Contains a microprocessor (or Sensor)
• Microprocessor: Acts as the brain of the device.
• Function: Processes data and instructions.
• Examples: Smartphone, smartwatch, calculator.

Last updated NS on 13-09-2026

Explanation

• A plotter is an output device.
• It is used to produce vector graphics, drawings, maps, and engineering designs on paper.
• Plotters are commonly used in CAD (Computer-Aided Design).