App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 203 · 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: icons with no meaning is good button design. (a) False (b) True
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Save button: 52 px tall
   Back button: 44 px tall
   Done button: 64 px tall
3. 3.Which colour pair is hard to read? (a) dark blue on white (b) black on yellow (c) white on dark green (d) yellow on white
4. 4.True or false: a clear word like Save is good button design. (a) False (b) True
5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 28 px tall
   Send button: 72 px tall
   Start button: 48 px tall (a) Start (b) Save (c) Send
6. 6.🔘 Our rule: buttons are at least 48 px tall. The Save button is 24 px tall. How many px taller must it be?
7. 7.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 48 px tall
   Help button: 52 px tall
   Done button: 28 px tall (a) Cancel (b) Help (c) Done
9. 9.Which colour pair is hard to read? (a) red on green (b) white on dark green (c) black on yellow (d) dark blue on white
10. 10.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 56 px tall
    Help button: 28 px tall
    Cancel button: 60 px tall (a) Start (b) Cancel (c) Help
12. 12.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
13. 13.🔘 Our rule: buttons are at least 48 px tall. The Back button is 28 px tall. How many px taller must it be?
14. 14.Which colour pair is hard to read? (a) dark blue on white (b) white on black (c) light grey on white (d) black on pale grey
15. 15.Which colour pair is easy to read? (a) pale pink on white (b) light grey on white (c) yellow on white (d) black on pale grey
16. 16.🔘 Our rule: buttons are at least 48 px tall. The Help button is 24 px tall. How many px taller must it be?
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 40 px tall
    Next button: 60 px tall
    Help button: 52 px tall
    Save button: 52 px tall (a) Cancel (b) Help (c) Save (d) Next
18. 18.True or false: a tiny 20 px button is poor button design. (a) True (b) False
19. 19.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
20. 20.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design
21. 21.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 48 px tall
    Back button: 44 px tall
    Cancel button: 32 px tall
23. 23.True or false: strong colour contrast is good button design. (a) False (b) True
24. 24.Which colour pair is hard to read? (a) white on black (b) dark blue on white (c) pale pink on white (d) black on yellow
25. 25.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) dark blue on black (d) white on dark green
26. 26.True or false: strong colour contrast is poor button design. (a) True (b) False
27. 27.🔘 Our rule: buttons are at least 48 px tall. The Done button is 28 px tall. How many px taller must it be?
28. 28.True or false: buttons almost touching is good button design. (a) False (b) True
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 56 px tall
    Help button: 68 px tall
    Next button: 24 px tall (a) Cancel (b) Help (c) Next
30. 30.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 32 px tall
    Save button: 48 px tall
    Next button: 36 px tall
32. 32.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
33. 33.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 48 px tall
    Help button: 32 px tall
    Start button: 52 px tall
    Next button: 68 px tall (a) Next (b) Help (c) Start (d) Send
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 60 px tall
    Help button: 48 px tall
    Save button: 24 px tall
    Back button: 48 px tall (a) Save (b) Back (c) Help (d) Start
35. 35.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
36. 36.Which colour pair is easy to read? (a) red on green (b) dark blue on white (c) dark blue on black (d) yellow on white
37. 37.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 52 px tall
    Next button: 52 px tall
    Done button: 64 px tall
    Start button: 52 px tall
38. 38.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
39. 39.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
40. 40.Which colour pair is easy to read? (a) white on dark green (b) yellow on white (c) dark blue on black (d) light grey on white

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