App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 556 · 40 questions

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.

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

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