Practice Questions about Digital Devices

You will have a test next class period.  It will consist of 50 questions.  Most of these will be multiple choice.  A few may require you to write short explanations in a couple sentences, or to do a calculation.  Some of the practice questions will appear on the test, but not all of them.

1. Which of the following units could be used to measure the size of a memory card ?
   (a)  megapixels             (b) kilobits            (c) RAM          (d)  megabytes 
2. A gigabyte is the same as how many megabytes (approximately)?
   (a) 100                      (b) 1000             (c) 1 million          (d) 1 billion
3. Are all memory cards the same size and shape?
   (a) yes                   (b) no                   (c) not important
4. A typical digital camera has :
   (a) 1 kilopixel         (b) 1 megapixel       (d) 5 megapixels      (d) 10 megapixels
5. Without using compression, a 5 megapixel 24 bit color digital photo would occupy:
   (a) 1 megabyte       (b) 15 megabytes    (c) 15 kilobytes       (d) none of these
6. Digital photos can be stored in less space by using:
   (a) JPEG compression   (b) BMP compression    (c) zoom    (d) MP3 compression
7. If compressed photos occupy approximately 1 Megabyte, how many photos
   would fit in a 1 Gigabyte memory card?
   (a) 50            (b)  100          (c) 500       (d) 1000
8. Before attaching a digital photo to an e-mail, you should:
   (a) compress it       (b) zoom it      (c) sharpen the colors     (d) change it to TIFF format
9. After copying all your photos from a digital camera to a computer, it is a good idea
   to save a backup copy by:
   (a) buying a new memory card      (b) burning them onto a CD
   (c) renaming all the photos            (d) sending an e-mail to a friend
10. Write these in order from smallest to largest:
            Megabyte ,   Gigabyte  ,  Kilobyte ,  Terabyte
11. If you use a photo-editor to change your pictures, you should:
    (a) erase the originals      (b) compress the results every time you save
    (c) save the changed versions back in the camera    (d) keep copies of the originals
12. If you save photos over and over again using JPEG compression:
    (a) the results will get worse and worse each time you save
    (b) the results will get better and better each time you save
    (c) the results will stay the same each time you save
13. Approximately how much memory does a typical MP3 song occupy?
    (a) 1 MB         (b)  4  MB       (c)  16 MB       (d) 256 MB
14. If you increase the size of a digital image, it will look bad because:
    (a) the colors will get fuzzy           (b) the pixel will look like big dots
    (c) the picture will take more memory       (d) it can no longer be saved as JPEG
     
15. Which is true?
    (a) all digital cameras use the same memory cards
    (b) all digital cameras use the same kind of batteries
    (c) all digital cameras measure resolution in megapixels
    (d) all digital cameras use the same software  
16. Which term does NOT refer to a flat-screen monitor?
    (a) CRT       (b) TFT      (c) LCD      
17. A typical 17 inch flat screen display has a native resolution of:
    (a) 800x600      (b) 1280x1024      (c) 2000x1500     
     (d) it depends on the amount of memory available
18. Which has a higher resolution:  a 17 in TFT screen or a 5 megapixel digital camera?
    (a) the camera     (b) the TFT screen      (c) about the same   
19. Which has a better resolution - a 17 in  TFT screen or a 19 in CRT ?
    (a) the TFT screen      (b) the CRT        (c) about the same
20. Color depth refers to:
    (a) the quality of the color       (b) the thickness of the display
    (c) the number of colors available     (d) 3-D video game technology
21. Most displays and digital cameras use:
    (a) 24 bit color       (b) 16 bit color      (c) CRT color      (d) 16 colors
22. 32-bit color is actually most useful in
    (a) scanners         (b) mouse resolution      (c) printing    (d) video games    
23. Most digital cameras contain
    (a) an LCD display     (b) a CRT display    (c) no display     (d) electronic film
24. CRT monitors create pictures by:
    (a) heating the screen from behind      (b) shooting electrons from the back of the tube
    (c) storing the pictures in RAM          (d) using transistors inside the monitor
25. In a CRT, all colors are made by mixing which 3 basic colors?
    (a) rose, gold, blue        (b) cyan, magenta, yellow  
    (c) red, yellow, blue      (d) read, green, blue
26. Good CRT's produce higher resolution by:
    (a) using more energy      (b) placing pixels closer together
    (c) using more than 3 basic colors       (d) using higher quality glass
27. CRT displays must be refreshed about
    (a) 70 times per second    (b) 7 times per second    (c) once each second
28. Which uses less power - CRT or flat screens?
    (a) CRT       (b) flat screen      (c) about the same
29. Which is less expensive - CRT or flat screens?
    (a) CRT       (b) flat screen      (c) about the same
30. Which is faster - CRT or flat screens?
    (a) CRT       (b) flat screen      (c) about the same
31. Which is less fragile (harder to break)?
    (a) CRT      (b) flat screen      (c) about the same
    
     
32.  Which new display technology promises to use much less energy
    than CRTs or TFTs?
    (a) HDTV     (b) wireless    (c) OLED     (d) Nicad  
33. Moore's law states that microprocessors will:
    (a) get about 1 Gigahertz faster every year
    (b) get about 10 Gegahertz faster every year
    (c) double in power about every 2 years
    (d) double in power every year
34. Digital devices are become more and more ubiquitous. That means:
    (a) they are getting more and more powerful
    (b) they are available everywhere
    (c) they can run longer on batteries
    (d) they have many more microprocessors in them
35. Which does NOT contribute to more ubiquitous digital devices?
    (a) cheaper       (b) more powerful    (c) smaller sizes     (d) better security
36. Integration in digital devices refers to:
    (a) putting more chips into a single device
    (b) making a single device with more features
    (c) squeezing the same features into a smaller space
    (d) all of the above
37. Which battery type is the cheapest to buy?
    (a) alkaline    (b) Nicad      (c) Nimh      (d) Li-ion
38. Which battery type provides the most hours without recharging?
     (a) alkaline    (b) Nicad      (c) Nimh      (d) Li-ion
39. Which battery type is worst for the environment due to heavy metals?
    (a) alkaline    (b) Nicad      (c) Nimh      (d) Li-ion
40. Which battery type uses the newest technology?
    (a) alkaline    (b) Nicad      (c) Nimh      (d) Li-ion
41. How does wireless technology usually work?
    (a) radio waves     (b) ultra-sonic     (c) cables      (d) lasers
42. Which battery type does not look the same as the other three?
    (a) alkaline    (b) Nicad      (c) Nimh      (d) Li-ion
43. What is a typical battery life for a notebook computer?
    (a) 1 hour     (b) a few hours     (c) 8 hours      (d) 24 hours
44. Is a cell phone (handy) a digital device?
    (a) yes, because it contains a battery
    (b) yes, because it contains a microprocessor
    (c) no, because it does not contain a disk drive
    (d) no, because it cannot be connected to the Internet
45. Fifty years ago, computers:
    (a) were much larger than now            (b) were much cheaper than now
    (c) only did word-processing              (d) only had CRT monitors
    
46. Assume that MP3 songs require an average of 4 MB storage space.
    Calculate the number of songs that will fit into 1 GB of memory.   
      
47. Explain why memory cards come in strange sizes
    like 256 MB and 512 MB, rather than 250 MB and 500 MB.
     
48. Explain the purpose of the transistors in a Thin-Film Transistor display.
     
49. Explain why you cannot uby replacement batteries for some cameras
    in normal stores.
     
50. Explain how the photographs in a digital camera can be
    copied into a computer - what do you need to do?

Case Study

Imagine we are in the year 2010, and FIS has finally decided to get rid of
all the PC's, and require every student to use a notebook (portable) computer.

Another school called SIF has decided exactly the opposite -
they banned notebook computers from their school and will install
a computer on every desk in the school.

In both schools, the school will pay for all the computers.  In both schools,
all students will have a computer available at all times in every classroom,
including an Internet connection.

Describe two advantages and two disadvantages for the students
of the FIS system over the SIF system.   This will not include the cost,
because the students are not paying for the computers.