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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 482 · 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. How many of these buttons follow the rule?
    Cancel button: 60 px tall
    Next button: 48 px tall
    Start button: 60 px tall
    Help button: 56 px tall
  2. 2.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 px tall. How many px taller must it be?
  3. 3.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
  4. 4.True or false: a clear word like Save is poor button design. (a) False (b) True
  5. 5.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) red on green (d) black on pale grey
  6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Cancel button: 40 px tall
    Back button: 64 px tall
    Next button: 48 px tall
  7. 7.Which colour pair is hard to read? (a) black on yellow (b) black on pale grey (c) dark blue on white (d) yellow on white
  8. 8.Which colour pair is easy to read? (a) light grey on white (b) pale pink on white (c) dark blue on white (d) dark blue on black
  9. 9.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
  10. 10.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
  11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 52 px tall
    Done button: 60 px tall
    Start button: 36 px tall
    Back button: 52 px tall     (a) Done (b) Next (c) Back (d) Start
  12. 12.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 56 px tall
    Start button: 44 px tall
    Cancel button: 48 px tall
    Back button: 44 px tall
  13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 44 px tall
    Cancel button: 36 px tall
    Start button: 44 px tall
  14. 14.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 68 px tall
    Send button: 64 px tall
    Next button: 36 px tall     (a) Start (b) Next (c) Send
  15. 15.True or false: a tiny 20 px button is poor button design. (a) False (b) True
  16. 16.🌗 Is white on black 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. The Back button is 28 px tall. How many px taller must it be?
  18. 18.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
  19. 19.Which colour pair is hard to read? (a) white on black (b) black on yellow (c) white on dark green (d) light grey on white
  20. 20.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
  21. 21.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
  22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Save button: 44 px tall
    Done button: 40 px tall
    Start button: 52 px tall
  23. 23.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
  24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 36 px tall
    Send button: 40 px tall
    Back button: 56 px tall
    Help button: 32 px tall
  25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 40 px tall
    Cancel button: 32 px tall
    Start button: 44 px tall
    Save button: 32 px tall
  26. 26.Which colour pair is easy to read? (a) light grey on white (b) black on yellow (c) pale pink on white (d) dark blue on black
  27. 27.🔘 Our rule: buttons are at least 48 px tall. The Send button is 32 px tall. How many px taller must it be?
  28. 28.Which colour pair is hard to read? (a) black on yellow (b) black on pale grey (c) dark blue on white (d) dark blue on black
  29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Send button: 36 px tall
    Back button: 44 px tall
    Next button: 64 px tall
  30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 44 px tall
    Back button: 56 px tall
    Send button: 72 px tall     (a) Send (b) Back (c) Help
  31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 36 px tall
    Save button: 68 px tall
    Back button: 48 px tall     (a) Save (b) Help (c) Back
  32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 56 px tall
    Save button: 40 px tall
    Cancel button: 32 px tall
  33. 33.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) white on dark green (d) pale pink on white
  34. 34.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
  35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 48 px tall
    Back button: 64 px tall
    Next button: 40 px tall     (a) Next (b) Back (c) Send
  36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 68 px tall
    Back button: 48 px tall
    Save button: 72 px tall
    Start button: 36 px tall     (a) Back (b) Save (c) Next (d) Start
  37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 60 px tall
    Done button: 68 px tall
    Cancel button: 44 px tall
    Next button: 68 px tall     (a) Next (b) Cancel (c) Done (d) Help
  38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 56 px tall
    Cancel button: 56 px tall
    Back button: 36 px tall
  39. 39.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
  40. 40.Which colour pair is hard to read? (a) dark blue on white (b) black on pale grey (c) black on yellow (d) red on green

Answer key

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

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