App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 641 · 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. How many of these buttons follow the rule?
   Help button: 60 px tall
   Start button: 52 px tall
   Cancel button: 36 px tall
   Send button: 60 px tall
2. 2.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
3. 3.Which colour pair is easy to read? (a) yellow on white (b) dark blue on black (c) pale pink on white (d) black on yellow
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Save button is 40 px tall. How many px taller must it be?
5. 5.🔘 Our rule: buttons are at least 48 px tall. The Help button is 28 px tall. How many px taller must it be?
6. 6.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
7. 7.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
8. 8.True or false: a tiny 20 px button is good button design. (a) True (b) False
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Send button: 72 px tall
   Next button: 24 px tall
   Done button: 72 px tall
   Start button: 60 px tall (a) Done (b) Start (c) Send (d) Next
10. 10.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 32 px tall
    Cancel button: 44 px tall
    Start button: 40 px tall
12. 12.Which colour pair is hard to read? (a) white on black (b) black on yellow (c) white on dark green (d) yellow on white
13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 40 px tall
    Next button: 32 px tall
    Send button: 64 px tall
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 44 px tall
    Next button: 60 px tall
    Cancel button: 60 px tall
15. 15.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 44 px tall
    Cancel button: 48 px tall
    Save button: 56 px tall
    Done button: 64 px tall (a) Done (b) Save (c) Cancel (d) Help
16. 16.🌗 Is yellow on white 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. How many of these buttons follow the rule?
    Next button: 48 px tall
    Start button: 44 px tall
    Back button: 36 px tall
    Done button: 60 px tall
18. 18.Which colour pair is easy to read? (a) dark blue on black (b) light grey on white (c) yellow on white (d) black on pale grey
19. 19.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 60 px tall
    Next button: 40 px tall
    Done button: 40 px tall
    Save button: 44 px tall
20. 20.True or false: space between buttons is poor button design. (a) True (b) False
21. 21.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 48 px tall
    Send button: 36 px tall
    Start button: 60 px tall
    Save button: 36 px tall
22. 22.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
23. 23.True or false: a tiny 20 px button is poor button design. (a) False (b) True
24. 24.🌗 Is white on black 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. The Start button is 20 px tall. How many px taller must it be?
26. 26.Which colour pair is hard to read? (a) dark blue on white (b) red on green (c) white on dark green (d) black on pale grey
27. 27.Which colour pair is hard to read? (a) white on dark green (b) white on black (c) pale pink on white (d) black on yellow
28. 28.True or false: strong colour contrast is good button design. (a) True (b) False
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 52 px tall
    Next button: 32 px tall
    Help button: 48 px tall
    Send button: 44 px tall
30. 30.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 60 px tall
    Next button: 72 px tall
    Help button: 40 px tall
    Cancel button: 48 px tall (a) Save (b) Help (c) Cancel (d) Next
32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 24 px tall
    Save button: 56 px tall
    Next button: 60 px tall
    Send button: 60 px tall (a) Next (b) Send (c) Save (d) Start
33. 33.True or false: strong colour contrast is poor button design. (a) False (b) True
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.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Back button is 44 px tall. How many px taller must it be?
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 40 px tall
    Back button: 60 px tall
    Help button: 64 px tall (a) Cancel (b) Help (c) Back
38. 38.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
39. 39.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
40. 40.True or false: grey text on grey is poor button design. (a) True (b) False

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