2. Which of the following is not a source data-entry device?a. bar-code readerb. sensorc. digital camerad. scannere. mouse3. Which of the following display standards has the highest screen resolution?4. Which of the following isn’t considered hardcopy output?5. Which of the following factors does not affect the quality of a screen display?True/False Questions1.On a computer screen, the more pixels that appear per square inch, the higher the resolution. T2.Photos taken with a digital camera can be downloaded to a computer’s hard disk.T3.Resolution is the amount of space between the centers of adjacent pixels. F4.The abbreviation dpi stands for “dense pixel intervals.” F5.Pointing devices control the position of the cursor on the screen. T6.Output hardware consists of devices that translate information processed by the computer into a form that humans can understand. T
7.Optical character-recognition software reads “bubble” marks and converts them into computer-usable form. F8.The lower the refresh rate, the more solid the image looks on the screen. F9.CRTs consume more power than flat-panel displays do. T10.Computer users have no need to be concerned about ergonomics. F11.It has been proven that electromagnetic fields pose no danger to human beings. F12.Plotters are used to print architectural drawings and in computer-aided design. TSection 2 Short Answer Questions1. What is a common use of dumb terminals? Dumb terminals are used, for example,in airline reservations systems, in large networks connected to a host computer that does the processing2. What characteristics determine the clarity of a computer screen? Pixels which is a small unit on a screen can be turned on and off and different shades. DP which is the amount of space between the centers of adjacent pixels. Resolution which is the image sharpness, color depth is the amount of info expressed in bits. Refreshrate is the number of times per second that pixels are recharged.3. Describe two situations in which scanning is useful. Bar-code scanning in post office or stores. Identifying lost pets, inputting graphics during desktop publishing, paying tolls at bridge 4. What is source data entry? They’re non keyboard data devices that create readable data on magnetic media or paper or feed it into computers processor. 5. What is pixel short for? What is a pixel? Picture element it is the smallest unit on the screen that can be turned on and off or different shades to display on screen.
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- Fall '09
- Networking, Inkjet printer, pointing device, carpal tunnel syndrome, a. ROM chips, a. RAM chips