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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 215 · 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. Which button is too small?
    Start button: 64 px tall
    Back button: 72 px tall
    Send button: 32 px tall     (a) Back (b) Send (c) Start
  2. 2.Which colour pair is hard to read? (a) black on yellow (b) dark blue on black (c) white on black (d) dark blue on white
  3. 3.Which colour pair is easy to read? (a) yellow on white (b) dark blue on black (c) red on green (d) white on dark green
  4. 4.Which colour pair is easy to read? (a) white on black (b) dark blue on black (c) red on green (d) yellow on white
  5. 5.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
  6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 56 px tall
    Send button: 60 px tall
    Save button: 56 px tall
    Done button: 40 px tall
  7. 7.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
  8. 8.🔘 Our rule: buttons are at least 48 px tall. The Send button is 44 px tall. How many px taller must it be?
  9. 9.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
  10. 10.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 40 px tall
    Start button: 52 px tall
    Cancel button: 52 px tall
    Send button: 32 px tall
  11. 11.True or false: a big, easy tap area is poor button design. (a) False (b) True
  12. 12.True or false: grey text on grey is good button design. (a) True (b) False
  13. 13.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
  14. 14.Which colour pair is hard to read? (a) black on yellow (b) white on dark green (c) pale pink on white (d) dark blue on white
  15. 15.Which colour pair is hard to read? (a) white on dark green (b) black on yellow (c) yellow on white (d) dark blue on white
  16. 16.🔘 Our rule: buttons are at least 48 px tall. The Next button is 32 px tall. How many px taller must it be?
  17. 17.🔘 Our rule: buttons are at least 48 px tall. The Done button is 40 px tall. How many px taller must it be?
  18. 18.Which colour pair is easy to read? (a) dark blue on black (b) light grey on white (c) pale pink on white (d) black on pale grey
  19. 19.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?
  20. 20.🔘 Our rule: buttons are at least 48 px tall. The Start button is 40 px tall. How many px taller must it be?
  21. 21.True or false: a clear word like Save is poor button design. (a) False (b) True
  22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 64 px tall
    Back button: 44 px tall
    Start button: 36 px tall
  23. 23.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
  24. 24.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
  25. 25.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Cancel button: 24 px tall
    Start button: 64 px tall     (a) Cancel (b) Save (c) Start
  26. 26.🔘 Our rule: buttons are at least 48 px tall. The Send button is 36 px tall. How many px taller must it be?
  27. 27.True or false: grey text on grey is poor button design. (a) False (b) True
  28. 28.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) white on dark green (d) light grey on white
  29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 68 px tall
    Save button: 40 px tall
    Start button: 56 px tall     (a) Start (b) Next (c) Save
  30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 44 px tall
    Next button: 48 px tall
    Back button: 36 px tall
    Start button: 48 px tall
  31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Next button: 44 px tall
    Done button: 36 px tall
  32. 32.True or false: icons with no meaning is poor button design. (a) True (b) False
  33. 33.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
  34. 34.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
  35. 35.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
  36. 36.Which colour pair is hard to read? (a) black on pale grey (b) black on yellow (c) red on green (d) white on dark green
  37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 48 px tall
    Next button: 28 px tall
    Done button: 56 px tall     (a) Next (b) Start (c) Done
  38. 38.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
  39. 39.True or false: space between buttons is good button design. (a) False (b) True
  40. 40.Which colour pair is easy to read? (a) black on yellow (b) yellow on white (c) pale pink on white (d) red on green

Answer key

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

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