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Class-4 Computer L-2 Input and Output Devices

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Class-4 Computer L-2 Input and Output Devices CLASS-4 COMPUTER L-2 INPUT AND OUTPUT DEVICES BOOK EXERCISE A. Tick () the correct options. 1. Which of the following is NOT an input device? a. touchpad ( ) b. projector () c. MICR ( ) 2. What does OCR stands for? a. Optical Character Recognition () b. Oriented Character Recognition ( ) c. Optical Copy Recognition ( ) 3. A plotter prints on paper by using . a. A stylus ( ) b. pencils ( ) c. pens () 4. Which of the following is an output device? a. projector ( ) b. laser printer ( ) c. both a and b () B. Fill in the blanks. Picture barcode biometric projection MICR typeface 1. A barcode is a pattern of parallel lines of varying width printed on different products. 2. OCR does not treat the text as picture. 3. A projector projects an image (or moving images) onto a large surface known as projection screen. 4. The MICR technology recognizes the data printed bin the MICR typeface. 5. A biometric device uses fingerprint, facial scans or voice recognition to identify users. CLASS-4 COMPUTER L-2 INPUT AND OUTPUT DEVICES C. Identify each of the following as input or output devices. Projector, Light pen, Touchpad, Touchscreen, web-cam, Monitor, Printer, Plotter, Keyboard, Mouse, MICR, Speakers, Scanner, OCR, Microphone. Ans: Input Devices Output Devices MICR Projector Touchpad Monitor Scanner Printer Touchscreen Speakers Keyboard Plotter OCR Web Cam Mouse Microphone D. Answer in one word- 1. A latest input device enables you to choose options on the computer screen by simply touching with a finger. (Touchscreen) 2. A device that projects an image onto a large surface. (Projector) 3. A device that draws on paper with one or more automated pens. (Plotter) 4. An input device mainly used for playing computer games and controlling industrial robots. (Joystick) 5. A device that scans barcodes. (Barcode Reader) CLASS-4 COMPUTER L-2 INPUT AND OUTPUT DEVICES CLASS NOTES E. Short answer questions. 1. What are input devices? Ans. The devices that are used to enter instructions into the computer are called input devices. 2. What are the full forms of OCR and OMR? Ans. OCR- Optical Character Recognition, OMR- Optical Mark Recognition. 3. Give names of any two input devices. Ans. The two input devices are keyboard and mouse. 4. Give names of any two output devices. Ans. The two output devices are monitor and printer. 5. List names of any two non-impact printers. Ans. The two non-impact printers are inkjet printer and laser printer. 6. What are impact printers? Ans. An impact printer makes contact with the paper. It usually forms the print image by pressing an inked ribbon against the paper using a hammer or pins. 7. What is ALU? Ans. ALU stands for Arithmetic and Logic Unit. The ALU does all the arithmetic calculations, such as addition, subtraction, multiplication and division. It also takes logical decisions, such as comparing larger or smaller values, true or false statements, etc. 8. What is CU? Ans. The CU controls all the operations done on a computer. CLASS-4 COMPUTER L-2 INPUT AND OUTPUT DEVICES F. Long answer questions. 1. What is a scanner? Describe types. Ans. A scanner allows you to scan information printed on paper or some other media. The scanned information is transferred to a computer’s hard disk for further processing. It uses a light beam to scan the input data. The various types of scanner are- a. Flatbed scanner: A flatbed scanner takes some space on your desk. Depending on its size, it can fit standard (A4) or legal sized documents, and the flexible cover allows you to scan large items such as books. It is great for scanning the occasional newspaper article, book chapter, or photograph. b. Handheld scanner: A handheld scanner is moved by hand over the information that is to be scanned. It is much smaller and less expensive than a flatbed scanner. 2. Distinguish between impact and non-impact computers? Give examples of each. Ans. IMPACT PRINTER NON-IMPACT PRINTER An impact printer makes contact with the A non-impact printer does not use a paper. It usually forms the print image by striking device to hammer against the pressing an inked ribbon against the paper paper to produce characters. using a hammer or pins. An example of impact printer is a dot-matrix Examples of non-impact printers are printer. inkjet and laser printers. .
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