App Dev Worksheet: Button Size and Contrast

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

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