App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 45 · 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: strong colour contrast is poor button design. (a) True (b) False
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Start button: 28 px tall
   Next button: 68 px tall
   Save button: 52 px tall (a) Start (b) Next (c) Save
3. 3.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Cancel button: 64 px tall
   Next button: 60 px tall
   Start button: 56 px tall
   Back button: 32 px tall
4. 4.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
5. 5.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
6. 6.Which colour pair is easy to read? (a) yellow on white (b) pale pink on white (c) black on pale grey (d) light grey on white
7. 7.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Cancel button: 56 px tall
   Back button: 32 px tall
   Send button: 60 px tall
   Start button: 56 px tall
8. 8.Which colour pair is easy to read? (a) pale pink on white (b) red on green (c) white on black (d) dark blue on black
9. 9.🌗 Is black on yellow 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: a clear word like Save? (a) poor design (b) good design
11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 56 px tall
    Start button: 52 px tall
    Back button: 32 px tall
12. 12.True or false: a big, easy tap area is good button design. (a) True (b) False
13. 13.Which colour pair is hard to read? (a) black on pale grey (b) white on dark green (c) yellow on white (d) white on black
14. 14.True or false: strong colour contrast is good button design. (a) True (b) False
15. 15.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 52 px tall
    Help button: 44 px tall
    Save button: 32 px tall
    Cancel button: 32 px tall
17. 17.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
18. 18.🔘 Our rule: buttons are at least 48 px tall. The Done button is 24 px tall. How many px taller must it be?
19. 19.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
20. 20.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
21. 21.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 56 px tall
    Save button: 56 px tall
    Back button: 40 px tall
    Send button: 52 px tall
22. 22.Which colour pair is easy to read? (a) light grey on white (b) dark blue on black (c) dark blue on white (d) yellow on white
23. 23.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Back button: 64 px tall
    Send button: 64 px tall
    Save button: 44 px tall
25. 25.🔘 Our rule: buttons are at least 48 px tall. The Send button is 40 px tall. How many px taller must it be?
26. 26.True or false: a tiny 20 px button is good button design. (a) True (b) False
27. 27.Which colour pair is hard to read? (a) white on black (b) black on yellow (c) red on green (d) white on dark green
28. 28.Which colour pair is hard to read? (a) dark blue on white (b) black on pale grey (c) white on black (d) dark blue on black
29. 29.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Done button: 52 px tall
    Back button: 44 px tall
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 56 px tall
    Cancel button: 64 px tall
    Save button: 32 px tall (a) Start (b) Cancel (c) Save
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Save button is 32 px tall. How many px taller must it be?
33. 33.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 28 px tall
    Cancel button: 52 px tall
    Start button: 56 px tall (a) Start (b) Cancel (c) Save
35. 35.True or false: a tiny 20 px button is poor button design. (a) True (b) False
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 32 px tall
    Cancel button: 52 px tall
    Save button: 68 px tall (a) Cancel (b) Help (c) Save
37. 37.Which colour pair is hard to read? (a) black on pale grey (b) white on dark green (c) dark blue on white (d) light grey on white
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Next button: 56 px tall
    Cancel button: 52 px tall
39. 39.True or false: grey text on grey is poor button design. (a) True (b) False
40. 40.True or false: grey text on grey is good button design. (a) False (b) True

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