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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 512 · 40 questions
TalentJR

Developer's tip (Big and bold): Our rule: every button is at least 48 px tall. Missing px = 48 − height. Leave space between buttons; use clear words like Save or Send. Strong contrast (black on yellow, white on dark green) is easy to read; similar colours are hard.

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  1. 1.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 28 px tall
    Cancel button: 72 px tall
    Send button: 72 px tall
    Back button: 56 px tall     (a) Cancel (b) Back (c) Send (d) Done
  2. 2.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?
  3. 3.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
  4. 4.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 44 px tall. How many px taller must it be?
  5. 5.True or false: icons with no meaning is poor button design. (a) True (b) False
  6. 6.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
  7. 7.True or false: a clear word like Save is poor button design. (a) True (b) False
  8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 40 px tall
    Next button: 44 px tall
    Send button: 52 px tall
  9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 52 px tall
    Back button: 24 px tall
    Next button: 60 px tall     (a) Back (b) Next (c) Done
  10. 10.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
  11. 11.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) dark blue on black (d) white on dark green
  12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 40 px tall
    Cancel button: 60 px tall
    Next button: 72 px tall
    Save button: 52 px tall     (a) Save (b) Next (c) Send (d) Cancel
  13. 13.🔘 Our rule: buttons are at least 48 px tall. The Save button is 44 px tall. How many px taller must it be?
  14. 14.True or false: buttons almost touching is good button design. (a) False (b) True
  15. 15.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 72 px tall
    Save button: 60 px tall
    Help button: 32 px tall     (a) Cancel (b) Save (c) Help
  16. 16.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
  17. 17.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 32 px tall
    Cancel button: 40 px tall
    Start button: 48 px tall
  18. 18.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
  19. 19.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
  20. 20.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 52 px tall
    Save button: 48 px tall
    Done button: 64 px tall
    Send button: 40 px tall     (a) Save (b) Send (c) Help (d) Done
  21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 36 px tall
    Help button: 52 px tall
    Cancel button: 48 px tall
    Next button: 56 px tall     (a) Next (b) Cancel (c) Help (d) Save
  22. 22.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
  23. 23.True or false: a tiny 20 px button is poor button design. (a) False (b) True
  24. 24.Which colour pair is hard to read? (a) red on green (b) black on yellow (c) white on black (d) dark blue on white
  25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 44 px tall
    Back button: 48 px tall
    Save button: 52 px tall
    Help button: 36 px tall
  26. 26.🔘 Our rule: buttons are at least 48 px tall. The Back button is 28 px tall. How many px taller must it be?
  27. 27.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
  28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 56 px tall
    Start button: 56 px tall
    Save button: 36 px tall     (a) Done (b) Start (c) Save
  29. 29.Which colour pair is easy to read? (a) pale pink on white (b) light grey on white (c) dark blue on black (d) black on yellow
  30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 40 px tall
    Next button: 36 px tall
    Save button: 32 px tall
    Start button: 36 px tall
  31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 48 px tall
    Done button: 52 px tall
    Send button: 48 px tall
  32. 32.🔘 Our rule: buttons are at least 48 px tall. The Help button is 44 px tall. How many px taller must it be?
  33. 33.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 44 px tall
    Save button: 64 px tall
    Start button: 56 px tall
    Help button: 72 px tall     (a) Start (b) Help (c) Next (d) Save
  34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 56 px tall
    Done button: 48 px tall
    Start button: 32 px tall
    Save button: 56 px tall     (a) Start (b) Save (c) Back (d) Done
  35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 24 px tall
    Send button: 52 px tall
    Back button: 64 px tall     (a) Back (b) Save (c) Send
  36. 36.Which colour pair is hard to read? (a) white on dark green (b) dark blue on white (c) black on yellow (d) light grey on white
  37. 37.Which colour pair is hard to read? (a) white on black (b) white on dark green (c) black on pale grey (d) pale pink on white
  38. 38.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
  39. 39.True or false: buttons almost touching is poor button design. (a) True (b) False
  40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 64 px tall
    Help button: 52 px tall
    Next button: 52 px tall
    Start button: 48 px tall

Answer key

  1. Done
  2. 24
  3. hard to read
  4. 4
  5. True
  6. poor design
  7. False
  8. 1
  9. Back
  10. good design
  11. white on dark green
  12. Send
  13. 4
  14. False
  15. Help
  16. easy to read
  17. 1
  18. good design
  19. poor design
  20. Send
  21. Save
  22. poor design
  23. True
  24. red on green
  25. 2
  26. 20
  27. easy to read
  28. Save
  29. black on yellow
  30. 0
  31. 3
  32. 4
  33. Next
  34. Start
  35. Save
  36. light grey on white
  37. pale pink on white
  38. easy to read
  39. True
  40. 4

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