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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 28 · 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.

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

Answer key

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

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