02 - Input and Output Devices

 1. An input is data that a computer receives. An output is data that a computer sends.



 2. Read the excerpt below on the nature of input and see if you agree.
Computers only work with digital information. Any input that a computer receives must be digitised.

Often data has to be converted back to an analogue format when it's output, for example the sound from a computer's speakers



 3. A monitor is an input device



 4. Trackballs, Barcode readers, Joysticks, MIDI keyboards are all….

  output devices

  storage devices

  input devices

  All of the above

 5. Touch screens are…

  output devices

  input devices

  Both input and output devices

  Magnetic touch storage devices

 6. An input device is part of the central processing unit.



 7. Read the following excerpt and select from the correct answer from the options.
Which of the following are input devices:
1. Keyboard
2. Monitor
3. Mouse
4. CPU
5. Printer
6. Barcode Reader

  1, 2 and 3

  1, 3 and 6

  All of them

  None of these are input devices

 8. What is an advantage of a 2D barcode over a 1D barcode?

  There is no advantage

  A 2D barcode can contain more information

  A 2D barcode is cheaper to produce

  A 2D barcode is easier to read

 9. How does a pen reader or laser scanner read a barcode?

  They detect changes in the intensity of reflected light

  They use optical character recognition software

  The user has to input the values manually

  They detect the smell of ink

 10. CMOS sensors are commonly used in phone cameras rather than CCD sensors as they comsume less power.



 11. What is an RFID tag?

  Readable Frequency Infrared Tag

  Remote Feral Identification Tag

  Radio Frequency Identification Tag

  Radio FM Indicator Tag

 12. Which of these is an example of a passive RFID tag?
Which of these is an example of a passive RFID tag?

1. A contactless bank card
2. A barcode
3. A radio transmitter 
4. A GPS receiver 


  All of them

  1 and 2

  3 and 4

 13. OLED stands for Organic Light-Emitting Diode screen.



 14. Why can inkjet printers print better photographs than laser printers?

  They can print more dots per inch (dpi) so the resolution is better

  They use less ink

  They can't - laser printers are always better

  They have better printer driver software

 15. What is this output device pictured below?

  A cooling fan

  An actuator

  A barcode scanner

  A 3D printer

 16. Fill in the blanks for the following excerpt on barcode readers
The barcode scanner detects the reflected light from the illumination 
system (the red light) and generates an ________________ that is 
sent to the decoder. The decoder interprets that signal, 
validates the barcode using the check digit, and converts it into text.

  analog signal

  arched signal

  arty binary sequence

  ambient sequence

 17. In a barcode reader, the converter changes the analog signal to a ________________ which is fed to the decoder.

  analog signal

  256 bytes

  digital signal

  binary bit

 18. Read the following excerpt on cell phones and see if you agree.
While cell phone cameras without auto-focus are not ideal for reading some common barcode formats, there are 2D barcodes which are optimized for cell phones, as well as QR Codes (Quick Response) codes and Data Matrix codes which can be read quickly and accurately with or without auto-focus



 19. The scanner resolution is measured by the ________________ of light emitted by the reader.

  size of the scanner

  size of the light beam

  size of the dot

  size of the shop in which it is contained

 20. Input and output devices (such as printers and scanners) are sometimes referred to as …

  CPU components

  mouse parts

  central computer parts