Input and Output Devices

Kartik can use a scanner.

Meenu can use a light pen to create a high quality drawing in a variety of colours.

Laser printer will be ideal for the above assignment.

Daisy Wheel Printer operates like a typewriter.

Rita can use the numeric keypad present on the right side of the keyboard.

A hard disk is the most suitable storage device for storing this large amount of information.

He can use laser printer.

The printed information on the paper is called hardcopy.

The first scanner was the Drum scanner introduced in 1957.

Ink-jet printers produce images by spraying tiny droplets of ink onto the paper.

Optical Mark Reader (OMR) is a type of scanner that can detect marks made with ink or pencil.

Light pen is the light sensitive pointing device.

Optical Character Reader (OCR) is used to read characters from a printed page to the computer.

A CD can hold up to 900 MB of data whereas a DVD can hold upto 17 GB of data.

Memory stick was launched by Sony in October 1993.

Blu-ray Disk is a new optical disk format that is rapidly replacing DVD.

The Thermal Printer prints its output on special heat sensitive paper.

The different types of mouse are as follows:

1. Mechanical Mouse — This type of mouse has a metal or rubber ball on its lower side that can roll in all the directions. The screen pointer moves according to the movement of the ball which is detected by the mechanical sensors within the mouse.
2. Opto-Mechanical Mouse — This type of mouse uses a mechanism similar to the mechanical mouse. The only difference is that it uses optical sensors to detect the movement of the ball.
3. Optical Mouse — An optical mouse does not have any mechanical moving parts. The laser technology is used to detect the movement of the mouse. It is more efficient and expensive than the Mechanical and Opto-Mechanical mouse.

MICR stands for Magnetic Ink Character Recognition. This technology allows computers to read information from the printed documents.

1. MICR characters are printed in special typefaces with a magnetic ink or toner, usually containing iron oxide.
2. As a machine decodes the MICR text, it first magnetizes the characters in the plane surface of the paper.
3. The characters are passed over an MICR read head, a device similar to the playback head of a tape recorder.
4. As each character passes over the head, it produces a unique wave form that can easily be identified by the system.
5. MICR codes can easily be read by humans.

MICR is used mainly by the banking industry to:

1. Ease the processing and clearance of cheques
2. Streamline the processing and clearance of other documents
3. Identify the document's originality

A barcode reader is an input device that scans barcodes and decodes the information they contain. A bar code is a combination of dark and light stripes. It is a computer readable representation of information, present in visual format. A bar code reader consists of a light source, a lens, and a light sensor for translating the optical impulses into electrical signals.

Barcode readers are used for a variety of purposes such as :

1. Tracking inventory
2. Processing transactions
3. Asset tracking
4. Package tracking
5. Time and attendance
6. Software upgrades

The three main types of Non Impact printers are:

1. Thermal Printers — Thermal printers use a special heat sensitive paper. Characters are formed when heated elements come in contact with the heat sensitive paper, thus forming darkened dots. The standard of print produced is poor. Thermal printers are widely used in battery powered equipments, such as portable calculators.
2. Ink-jet Printers — They produce images by spraying tiny droplets of ink onto the paper. They have very high quality output and can also produce coloured graphics. These printers are less noisy. The average quality of inkjet printers is 300 dpi (dots per inch). They use coloured cartridges which combine magenta, yellow, and cyan inks to create colour tones. A black cartridge is also used for crisp monochrome output. They are cheap and ideal for home/office.
3. Laser Printers — Laser printers use photocopy technology to print. They use a laser beam and dry powdered ink to produce a fine dot matrix pattern. The quality of output on paper is very good. They can also produce very high quality images. They are mostly used for DTP (Desktop Publishing) purpose. They can print about 6 to 10 pages per minute. They have a very high resolution ranging from 600-1200 dpi (dots per inch).

The different types of monitors are:

1. Cathode Ray Tube (CRT) Monitors — The features of a CRT monitor are:

   1. CRT monitors consist of an electron gun.
   2. In these monitors, a beam of electrons lights up the pixels/phosphor dots, which form the inner coating of the screen.
   3. Colour is achieved by combining Red, Green, and Blue (RGB) shades of different intensities.
   4. CRT monitors are bulky and occupy a lot of space.
   5. They are available in various sizes, like 14 inches, 15 inches, 17 inches, and 21 inches.
   6. A CRT monitor still has better contrast ratios and viewing angles than any other type of computer monitor.

2. Liquid Crystal Display (LCD) Monitors — The features of LCD monitors are :

   1. LCD monitors are relatively thinner and lighter than CRT monitors.
   2. They use the light modulating properties of Liquid Crystals (LCs).
   3. Liquid Crystals do not emit light directly.
   4. They save a lot of space and can be mounted on walls.
   5. They provide a wide viewing angle and come in various sizes ranging from 17 inches to 60 inches.
   6. They display sharp images and require less power to run.
   7. They are used in a wide range of applications including computer monitors, television, instrumental panels, aircraft cockpit displays, etc.
   8. They are also used in devices, such as clocks, watches, calculators, gaming devices, and telephones.

3. Light Emitting Diode (LED) Monitor — LED display has the following features:

   1. LED monitors are light emitting diodes that act as performance boosters in them.
   2. LED monitors offer better colour quality, clarity, and display than the LCD monitors.
   3. These monitors are flat, thinner and lighter in weight.
   4. The biggest advantage of LED display is its efficient and low energy consumption, which is especially needed for handled and chargeable devices, such as mobile phones, tablets, and laptops.
   5. These monitors are in maximum use nowadays.

The various types of memory sticks are:

1. Memory Stick PRO — It was introduced in 2003 as a joint effort of Sony and SanDisk. It is available in storage sizes up to 2 GB.
2. Memory Stick Duo and Memory Stick PRO Duo — These are basically smaller versions of the Memory stick and Memory stick Pro. Memory stick Duo was replaced by Memory Stick Pro Duo due to its increased size limitation and slow transfer speed. With faster data transfer speed and high capacity flash memory, a Memory Stick Pro Duo card perfectly meets the requirements of a portable digital device.
3. Magic Gate — It is a copy protection technology introduced by Sony in 1999. It is a form of DRM (Digital Rights Management) that allows for protected content to be transferred to and from a memory card and utilized on a device, such as an MP3 player or cellular phone. It encrypts the data stored on a card and enforces control over how files are copied. It is typically used for audio and video but can also be used for contents in other formats.

The various types of keys of a keyboard are:

1. Typing Keys — These keys include letters (Alphabet keys), numbers (Number keys), punctuation (. , : ; ' ") and Special Symbol (+ - - $ keys) etc. These keys also include the Shift, Caps Lock, Spacebar, Backspace, and the Tab keys.
2. Control Keys — These keys are either used alone or in combination with other keys to perform an action. Ctrl, Alt, Windows logo key, and the Esc key are various examples of Control keys.
3. Navigation Keys — They are used for moving through documents or web pages and sometimes for editing the text. These keys include the Arrow keys, HOME, END, PgUp, PgDn, DELETE, and INSERT keys.
4. Function Keys — They are used to perform specific tasks. They are placed on the top row of the keyboard and are labelled as F1, ..., F12. These keys have different functions in different programs.
5. Numeric Keypad — The numeric keypad consists of number keys from 0 to 9, the arithmetic operators and the decimal point. It is placed on the right side of a keyboard and is used for entering numbers at a faster pace.

A webcam is the short form of the web camera. It is a device primarily used to share a live image in real time to or through a computer in a network.

A webcam is connected to the computer by a USB cable or built into computer hardware, such as laptops. When sent to a remote location, the videos can be recorded, viewed, saved on the hard drive or live-streamed over the internet.

A webcam is widely used in organizations for video conferencing. They can also be used for video telephony, live streaming, social media, security, video surveillance etc.

CPU

Reason — CPU is the brain of the computer Printer and plotter are output devices and scanner is an input device.

Keyboard

Reason — Keyboard is not a pointing device. Mouse, light pen and trackball are pointing devices.

Plotter

Reason — Plotter is an output device. CD ROM, DVD and flash drive are storage devices.

Graphic Designer

Reason — Graphic Designer is the most probable user of a Light Pen.

Optical mouse

Reason — Optical mouse uses laser technology to detect the motion of the ball.

Plotters

Reason — Plotter is a vector based graphical printing device.

Scanner

Reason — Scanner scans images, documents, and saves them on a computer as a digital image.

Drum plotter

Reason — Drum plotter is used to produce continuous output such as plotting earthquake activity.

120 mm

Reason — The diameter of the standard CD is 120 mm.

CD-ROM

Reason — The rate of data transmission of a DVD is faster than CD-ROM.

Blu-ray Disk

Reason — The disk which uses blue violet laser to read and write is Blu-ray Disk.

Blu-ray Disk

Reason — The Blu-ray Disk offers more than five times the storage capacity of a traditional DVD.

Flash drive

Reason — A portable memory data storage device which is mainly used to transfer files from the hard drive of one computer to another is Flash drive.

Memory Stick Pro

Reason — Memory Stick Pro is a removable flash memory card format was launched in 2003 as a joint effort of Sony and Scan Disk.

cps

Reason — The speed of a Dot Matrix printer ranges from 50 (characters per second) to 500 (characters per second).

Impact printer

Reason — Dot-Matrix printer is a type of impact printer.

VDU

Reason — Visual Display Unit (VDU) is an output device.

Photocopy technology

Reason — A laser printer uses Photocopy technology.

PROM

Reason — Programmable ROM (PROM) is used as an internal memory.

Both 1 and 2

Reason — RAM and ROM are both main memory. RAM is a volatile memory and ROM is a non-volatile memory.

Magnetic Ink Character Reader

Reason — MICR stands for Magnetic Ink Character Reader.

Non-impact printer does not use physical impact while transferring characters to paper.

Two types of Impact printers are:

1. Daisy Wheel Printer
2. Dot Matrix Printer

Input devices are used to give instruction to the computer.

The four components of a computer are:

1. Input unit
2. Central Processing unit
3. Output unit
4. Secondary Storage unit

Two pointing devices are mouse and joystick.

The types of plotters are :

1. Flatbed Plotter
2. Drum Plotter

Two manufacturers of plotters are Hewlett Packard and Roland.

Blu-ray disk can hold upto 25 GB of data on a single layer and 50 GB of data on a dual layer disk.

The versions of a DVD are single-sided and double-sided.

A DVD is available in many formats such as :

1. DVD - R
2. DVD - RW
3. DVD - R and DVD - RW have two additional formats, which are + and -. For example: DVD - R and DVD + R.

Hard disk was introduced in 1954 by an IBM team led by Rey Johnson. The other name of hard disk is Winchester Disk.

VDU — Visual Display Unit

CD-ROM — Compact Disk - Read Only Memory

MICR — Magnetic Ink Character Reader

OCR — Optical Character Reacher

OMR — Optical Mark Reader

Flash drive is plugged into the USB port of the computer.

Some places where we can find the application of touch screens are:

1. ATMs (Automated Teller Machines) use touch screens for user input and help in completing transactions.
2. Touch-sensitive whiteboards are commonly used in educational settings.
3. Many video game consoles utilize touch screens for gameplay and navigation.
4. Point-of-Sale (POS) Systems use touch screen in retail, restaurants, and hospitality for processing transactions and managing orders.
5. Automotive touch screens in cars allow drivers to control navigation, entertainment and climate settings in vehicles.
6. Touch screens are used in ticket vending machines at subway stations, bus stops, and railway stations.

False

Reason — A scanner is an input device.

False

Reason — Blu-ray disk can store upto 6 times the data stored in a regular DVD.

True

Reason — Inkjet is a non-impact printer.

False

Reason — ♦A touch screen isa special monitor that allows the user to input information by touching the icons on the screen.

False

Reason — Speaker is an output device to play sound.

False

Reason — Optical mark Reader is an input device used for marking objective type questions in various examinations.

True

Reason — There are two types of printers — Impact Printer and Non-impact Printers.

False

Reason — A Flatbed plotter is also known as a Table Plotter.

True

Reason — A microphone is an input device used to record and store sound into a computer.

True

Reason — There are 12 Function keys on the keyboard.

True

Reason — Objects are created in 3D using additive process.