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[ Option D ]

An input device is a hardware device used to provide data and control signals to a computer. It allows users to enter information into the computer system for processing.

Input Devices and Their Functions:

Output Devices and Their Functions:

Devices with Both Input and Output Functions:

[ Option B ]

An input device is a hardware device used to provide data and control signals to a computer. It allows users to enter information into the computer system for processing.

Input Devices and Their Functions:

Output Devices and Their Functions:

Devices with Both Input and Output Functions:

[ Option C ]

Dot Matrix Printers are Impact Printers that use tiny pins to strike an ink ribbon, forming characters or images as a pattern of dots on paper.
They are called Serial Printers because they print one character at a time, moving horizontally across the page.
In contrast, line printers print one entire line at a time, and page printers (laser printers) print a full page at once.

[ Option B ]

A Joystick is an input device used to control the movement or actions of a device or object in a graphical environment or machine. It typically consists of a stick that can move in multiple directions, often accompanied by buttons for performing additional actions.

Joysticks are commonly employed in situations where precise, real-time control of movement is required, such as operating industrial robots, playing computer games, or training with flight simulators.

[ Option A ]

The Keyboard is the primary text input device of a computer, enabling users to enter alphanumeric and special characters directly.

[ Option D ]

Sensors are specialized input devices that measure physical conditions such as, temperature, humidity / moisture, pressure, and light intensity. The sensor convert these measurements into electrical signals that a computer can process.

[ Option A ]

A QR Code (Quick Response Code) has three position-detection squares that help scanners identify the orientation of the code.

• Two squares are located at the top-left and top-right corners.
• The third square is located at the bottom-left corner.

These position markers allow QR readers to quickly detect, align, and decode the information, regardless of the code’s angle or rotation.

[ Option C ]

Hardware refers to the physical components of a computer system, the parts that you can see and touch, such as the keyboard, monitor, printer, and motherboard. Hardware performs tasks based on the instructions given by software.

Software refers to the set of programs or instructions that tell the hardware how to perform specific tasks. It cannot be touched physically and includes applications like MS Word, Web Browser (Chrome, Firefox, Edge), and the operating system.

[ Option C ]

A Pointing Device is input device that allows a user to interact with a computer by controlling the movement of a pointer on the screen.

[ Option C ]

[ Option A ]

SD (Secure Digital, launch in the year 1999 by Panasonic, Toshiba, SanDisk), a type of non-volatile memory card used in cameras, mobiles, laptops, etc. The term "Secure Digital" refers to the original purpose, providing secure, portable storage for digital devices.

MMC (Multimedia Card, launch in the year 1997 by Siemens & SanDisk), an older memory card standard developed before SD cards. These are similar in size, but slower and less secure compared to SD.

• SD stands for Secure Digital, which is modern, secure, and widely used in devices like cameras, smartphones, and laptops. On the other hand, MMC stands for Multimedia Card, which is an older standard with limited speed and storage, and is now mostly replaced by SD cards.

[ Option B ]

Printers are output devices that produce hard copies of digital documents. Common printer types are:

• Inkjet Printer (Non-Impact Printers) : Sprays tiny droplets of liquid ink directly onto paper. Widely used for home and office printing.
• Dot-Matrix Printer (Impact Printers) : Uses pins to strike an ink ribbon and form characters.
• Laser Printer (Non-Impact Printers) : Uses laser beam and toner powder to print high-quality text or images, popular in offices.
• 3D Printer (Non-Impact Printers) : A printer type that creates three-dimensional objects by laying down material layer by layer, used in prototyping and manufacturing.
   

[ Option C ]

LCD (Liquid Crystal Display) panels work on the principle of light modulation. The main job of an LCD is to "modulate" light, not generate it.

Instead of producing light by themselves, LCDs use a backlight behind the panel. The liquid crystals in the display control how much light passes through to create the images you see. To do this, the crystals change their orientation when electricity is applied, allowing more or less light to pass through each part of the display.

Common Display Technologies:

[ Option C ]

A computer system communicates with the outside world through input and output devices. 
Input Devices are used to send data and instructions to the computer, allowing users to interact with and control the system. Examples of input devices include the keyboard, mouse, scanner, and microphone. 

Output Devices receive information from the computer and present it in a form understandable to the user. Common examples of output devices are monitors, printers, and speakers.

[ Option C ]

The Right Button is used to open a context menu (shortcut menu) that displays a list of commands or options relevant to the selected item or area on the screen.
The Left Button is mainly used for selection and clicking, while the Centre Button (Scroll Wheel) is used for scrolling.

[ Option A ]

In this section, you will find detailed explanations for similar types of questions. Thank you.

[ Option D ]

A printer is an output device that produces a hard copy of text, images, or graphics from a computer or other digital devices. Printers are classified based on the mechanism used to print, speed, and quality of output.

1. Impact Printers, print by physically striking an ink ribbon against the paper.
2. Non-Impact Printers, print without physically striking the paper, using heat, laser, or ink.
3. 3D Printers, create three-dimensional objects by layering material according to a digital model.
4. Multifunction Printers (MFPs), combine printing, scanning, copying, and sometimes faxing into a single device.

Laser printers are known for their high speed, high quality output, and relatively quiet operation compared to older types like dot-matrix or typewriter printers.

[ Option B ]

[ Option C ]

In this section, you will find detailed explanations for similar types of questions. Thank you.

[ Option A ]

LCD (Liquid Crystal Display) screens are widely used in gaming devices, clocks, watches, calculators, and telephones because they are:

• Thin and lightweight.
• Energy-efficient.
• Capable of displaying clear text and simple graphics.

[ Option D ]

A Barcode Reader (BCR) is an input device used to scan and interpret barcodes on products or documents. Its main functions include:

• Capture Information : Uses a laser or camera to detect the barcode.
• Read Information : Identifies the pattern of bars and spaces.
• Translate the Barcode : Converts the scanned barcode into numerical or alphabetical data that the computer can process.

[ Option B ]

A Monitor is a device used to display output from a computer directly on a screen. Common types of monitors include LCD (Liquid Crystal Display), Plasma, and CRT (Cathode Ray Tube) monitors.
Projector, however, projects images onto a screen or wall and is not a monitor itself. It only displays output indirectly.

[ Option B ]

[ Option C ]

An optical mouse uses a Light-Emitting Diode (LED) as its light source.

• The LED shines light onto the surface below the mouse.
• A sensor captures the reflected light and detects movement by analyzing changes in the pattern of reflected light.
   

[ Option D ]

MICR stands for Magnetic Ink Character Recognition. It is a technology used by banks to print a special code at the bottom of cheques. This code uses a unique ink with magnetic particles, which makes it possible for machines to read and verify the printed numbers quickly and securely.
Mahi cannot change or alter this code because magnetic ink and special fonts are used, which prevent tampering or duplication.

[ Option C ]

[ Option C ]

In this section, you will find detailed explanations for similar types of questions. Thank you.

[ Option D ]

[ Option D ]

A Printer is an output device that produces a hard copy of text, images, or graphics from a computer or other digital devices.
An Impact Printer is a type of printer that creates images on paper by physically striking an ink ribbon against the paper, similar to how a typewriter works.
Dot Matrix Printers use several tiny pins in a print head. When these pins hit the inked ribbon, they form letters, numbers, or graphics as patterns of dots. This technology is called "Dot Matrix" because the printed results are actually made up of small dots, arranged in a grid (matrix).

Other types of printers:

[ Option C ]

A printer is an output device that produces a hard copy of text, images, or graphics from a computer or other digital devices. Printers are classified based on the mechanism used to print, speed, and quality of output.

1. Impact Printers, print by physically striking an ink ribbon against the paper.
2. Non-Impact Printers, print without physically striking the paper, using heat, laser, or ink.
3. 3D Printers, create three-dimensional objects by layering material according to a digital model.
4. Multifunction Printers (MFPs), combine printing, scanning, copying, and sometimes faxing into a single device.

[ Option A ]

3-D Printing is the most advanced because it creates physical 3D objects instead of just printing on paper. It combines design software, materials, and precise layer deposition for manufacturing complex shapes.

[ Option B ]

MICR : Magnetic Ink Character Recognition

• Special technology used in banking to process cheques quickly and accurately.
• The numbers at the bottom of cheques are printed using magnetic ink, which can be read by MICR readers even if the cheque is slightly damaged. This ensures fast and error-free processing of financial transactions.

Digitizer : Converts drawings or images into digital form. It is commonly used in graphic design and CAD (Computer-Aided Design) applications.

Barcode Reader (BCR) : Reads barcodes on products. It helps in fast product identification and inventory management in stores and warehouses.

Captcha : Used to verify human users online, not for banking. It prevents automated bots from accessing websites and submitting forms.

[ Option A ]

A touchpad (trackpad) on laptops and other devices is a sensitive flat surface that detects the movement and position of your fingers to control the mouse cursor on the screen.

• A Stylus is used mainly with touchscreens or graphic tablets, not with touchpads.

[ Option C ]

Hardware refers to the physical components of a computer system, the parts that you can see and touch, such as the keyboard, monitor, printer, and motherboard. Hardware performs tasks based on the instructions given by software.

Software refers to the set of programs or instructions that tell the hardware how to perform specific tasks. It cannot be touched physically and includes applications like MS Word, MS Excel, Web Browser (Chrome, Firefox, Edge), and the operating system.