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App Dev Worksheet: Button Size and Contrast

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

Answer key

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

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