9th Class Computer: chapter 3 Input/ Output Devices Short Questions Answer
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Any thing given to a computer is called input. The input can be given in different forms such as text, image and sound.
The devices that are used to give data and instruction to computer are known as input devices. the input devices convert data and instructions into a form that can be processed by a computer. These devices send data to process unit for processing.
Three categories of input devices are Keyboard, pointing devices, scanning devices, vice input devices and digital camera.
Some commonly used input devices are keyboard, mouse, scanner and digital camera.
Keyboard is most commonly used input device. It is used to input data into the computer. The layout of keyboard is similar to a traditional typewriter. It also contains the some extra command keys and function keys.
A slandered keyboard is normally called QWERTY keyboard. This is because first key on the top row of latter on this keyboard are Q, W, E, R, T and Y.
Backspace is used to delete a character on the left of the cursor.
Delete key on the keyboard is used to delete a character on the left of cursor.
Backspace key on the keyboard is used to delete a character on the left of cursor. Delete key on the keyboard is used to delete a character on the right of cursor.
SHIFT, ALT and CTRL keys are keyboard used in combination with other keys.
Function key are used to perform different function depending on the application being used. These key provides the shortcuts of routine task on computer.
Cursor control key is used to control the position of the cursor. these key are also known as the arrow keys. These key move the cursor from its current position to left, right, up or down.
An input device control the the pointer on the screen is called pointing device. A pointer is a small symbol that appear on the screen in graphical user interface. A pointing device can be used to select text, graphics and other objects such as buttons, icons and menu commands.
Three pointing devices are mouse, trackball and joystick.
Mouse is move on the flat surface to control the movement of pointer on a screen. The mouse button is used to perform different task such as selecting text etc.The movement of cursor depends on the movement of mouse.
Mouse is used to input control the instruction pointer on the screen. Mouse is moved on the flat surface to control movement of cursor or pointer on the screen.
An activity that perform by using the mouse is called mouse event. A typical mouse can perform different events. These events are left cick and drag etc.
Keyboard is used to input data of different kind such as numeric and alphanumeric. The mouse is used to input instructions and issue command. It is generally not used to input data.
A trackball is a large rotating ball on top. The ball is rotate on fingers. The position of cursor on the screen control by rotating the trackball. The body of trackball not move.
The advantage of trackball is that it remains stationary. It dose not required much space for use. It can be placed on any type of surface.
The difference is that the pointer on the screen stop moving when the movement of mouse stopped. However, the pointer remain continue move in the direction to which the joystick pointing. The joystick has to move to its neutral position to stop the pointer.
A scanner is a input device. It is used to read the picture and other printed materiel place on its glass. It scan whole page at once. It reads the picture and translate it in digital form and store it in computer. The information is store in the form of image or picture ont in the form of text.
Optical Character Recognition software is needed to read the image and convert it to actual text. This software varies widely in its ability to convert text to actual form.
A microphone is a input device. It is used to digital record audio data such as human voice. It can be plugged in to a computer or recorder. It enables a user input text and issue command orally. The software in the computer convert sound waves into digital form.
A voice recognition system convert the speech of person into digital data. It uses the microphone as input device. It allows the user to use voice as input. It enable the user input text and issue commands orally such as opening programs and using menus etc.
Digital camera is a input device. It store image digitally in the memory rather than recording on film. The picture taken on a digital camera can be downloaded on computer system. It does not required any film processing.
The main advantage of digital camera is that making photos inexpensive and fast. It dose nit require any film processing.
A disk drive used to read and write data on a disk. It rotate rotate the disk with precise timing. It has one or more read/write heads to read and write data. The read/write head read data from the disk and transfer it into main memory for further processing.
The data that has been processed into the useful information is called output. The output shown on display screen is called soft copy output. The output printed on paper is called hard copy output.
The hardware component that are used to revive information from the computer are called output device. Output devices take information from the computer and convert it in the form of that is understandable for the users.
Some important output devices are monitor, printer, plotter and speaker.
The output devices to display hard copy are printer and plotter. The output devices to display soft copy is monitor.
The monitor is most commonly used output device. It is also known as display or screen. The user look at monitor while performing different task such as typing, issuing command or surfing the internet etc.
The different type of monitors are CRT monitor and flat panel monitor.
Resolution is very important for monitor. All characters and images on the display screen are made up of pixel or dots. Resolution is number of pixel on screen. It is the image sharpness of display screen. A high number of pixel means sharper image.
Color monitor display output in multiple colors. The monochrome monitors show output in single color usually it white, green, red, blue aor amber.
CRT monitor consist of a phosphorus coated screen. Three are three electron guns in the back of the screen. The phosphor coated screen is organized. into a grid of dots. The smallest number of phosphor dot that can be focused by the gun is called pixel.
The flat panel monitor preferred over CRT monitor because it is compact in size. It takes less space and it is light weight. It use less energy then CRT monitor.
Soft copy is electric form but hard copy is printed form. Soft copy is easier to modify but hard copy is difficult to modify. Soft copy is stored on storage device but hard copy is printed on paper. Soft copy can be duplicated with out cost but hard copy can duplicated with cost.
CRT is less expensive than LCD monitor. It takes more space and use more energy than LCD. Its weight is more than LCD.
Resolution is an important factor that determines the quality of a printer. A higher dpi means the print quality is higher as the dots are smaller and more dots fit in areas.
The printers resolution is measured dots per inch dpi. The printer with higher resolution produced higher quality output.
The two categories of printer are Impact and non impact. Line and dots matrix are example of input printers. Laser and ink-jet are example of non impact printers.
Three types of impact printer are line printer, daisy printer and dots matrix printer.
An impact printer work like a type writer. It print characters are images by striking a print hammer or wheel against an inked ribbon.
A non impact printer print characters and graphics on paper with out striking paper. Some printer use spray ink while other use heat and pressure to create images. These printer are faster than impact printer.
Non impact printer do not make noise. They provide high quality output than impact printers. The print faster speed than impact printers.
A non impact printer print characters and graphics on paper with out striking paper. Impact printer print characters and graphics by striking a mechanism against an ink ribbon that physical touch the paper.
Laser printer produced very high quality output. It prints at higher speed. It dose not make much noise.
A dot matrix produces the printed image when tiny pins on printed head strike an inked ribbon. When the ribbon presses against the paper, it creates the dots that form characters and graphics. The printer head on a dot matrix printer can contain nine to twenty four pins.
Laser printer work similar to photocopy machine. It use laser beams to burn special powder on the page to create a permanent image. The powder in contained in the toner.
An ink-jet printer print the character or graphics by spraying the tiny drops of liquid ink on paper. These printer can produce quality text and graphics in both black-white and in color including photo. A typical ink-jet printer provides a resolution of 300 dots per inch.
Laser printer provides high quality text and graphics output. The price of inkjet printer is less than the laser printer. Laser printers are faster than than inkjet printer.
Pixel stands for picture element. Pixel are the dots that form image on the monitor. The higher number of pixel increase image sharpness.
A plotter is a large scale printer. It receive command from the computer to make drawing on paper. It creates output with one or more automatic pens. A plotter can draw continues point to point lines from computer graphics files or commands.
Flatbed plotter uses pens to draw images. The paper is placed on table like surface. The software instruct the pen to move down in the paper. The pen then move on the paper for creating image.
Drum plotter uses a rotating drum or cylinder.The Drawing pen is mounted on the drum. The pens move left and right on drum rotates. These movment creates images.
The plotter is better than printer to draw maps, graphs and machines components. It is very good for line drawings where acuracy and simplicity is ery necessary.
A plotter draws lines curve by using pens but printer prints lines and images using dots. Plotter is more expensive than printers. Plotter not used to print ordinary photographs.
CD-R stands for CD record able. The user can write data on CD-R only once but can read it many times. The data written to CD-R can be erased. CD-R can store 700MB of data. It is equal to 80 minutes digital audio or video.
CD-RW is stand for compact disc rewrite able. The user can read and writ data on CD-RW. CD writer is used to write data on CD-RW disc. The user can write data on CD-RW many time by erasing the existing contents. normally the user can rewrite 1000 times on CD-RW.
CD-R is used to write data once only and read it many times. the data written on CD-R can not be erased. CD-RW is used to write data many times. Normally the user can rewrite 1000 times on CD-RW.