App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 141 · 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.Which colour pair is easy to read? (a) red on green (b) light grey on white (c) black on pale grey (d) yellow on white
2. 2.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 28 px tall. How many px taller must it be?
3. 3.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 px tall. How many px taller must it be?
4. 4.True or false: a tiny 20 px button is good button design. (a) False (b) True
5. 5.True or false: icons with no meaning is poor button design. (a) True (b) False
6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Help button: 44 px tall
   Cancel button: 60 px tall
   Done button: 44 px tall
7. 7.True or false: strong colour contrast is good button design. (a) False (b) True
8. 8.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
9. 9.True or false: a big, easy tap area is poor button design. (a) True (b) False
10. 10.True or false: a clear word like Save is poor button design. (a) False (b) True
11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 60 px tall
    Start button: 60 px tall
    Save button: 32 px tall
12. 12.Which colour pair is hard to read? (a) dark blue on black (b) white on dark green (c) white on black (d) black on yellow
13. 13.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 60 px tall
    Start button: 52 px tall
    Send button: 28 px tall
    Help button: 72 px tall (a) Save (b) Help (c) Start (d) Send
14. 14.Which colour pair is hard to read? (a) pale pink on white (b) white on dark green (c) black on yellow (d) black on pale grey
15. 15.Which colour pair is hard to read? (a) white on black (b) black on yellow (c) white on dark green (d) yellow on white
16. 16.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 36 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?
    Done button: 44 px tall
    Send button: 56 px tall
    Save button: 72 px tall
    Start button: 68 px tall (a) Send (b) Start (c) Save (d) Done
18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 40 px tall
    Next button: 52 px tall
    Done button: 52 px tall (a) Done (b) Next (c) Cancel
19. 19.True or false: icons with no meaning is good button design. (a) True (b) False
20. 20.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
21. 21.🔘 Our rule: buttons are at least 48 px tall. The Done button is 36 px tall. How many px taller must it be?
22. 22.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 44 px tall
    Help button: 52 px tall
    Start button: 60 px tall
    Save button: 60 px tall (a) Start (b) Back (c) Help (d) Save
24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 28 px tall
    Send button: 68 px tall
    Start button: 68 px tall
    Save button: 68 px tall (a) Save (b) Next (c) Send (d) Start
25. 25.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 24 px tall
    Back button: 52 px tall
    Send button: 60 px tall (a) Back (b) Cancel (c) Send
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Help button is 24 px tall. How many px taller must it be?
27. 27.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
28. 28.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 60 px tall
    Help button: 64 px tall
    Done button: 36 px tall
29. 29.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
30. 30.🔘 Our rule: buttons are at least 48 px tall. The Start button is 20 px tall. How many px taller must it be?
31. 31.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 64 px tall
    Cancel button: 64 px tall
    Start button: 60 px tall
    Done button: 40 px tall
33. 33.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
34. 34.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 40 px tall
    Save button: 48 px tall
    Next button: 32 px tall
35. 35.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 28 px tall
    Next button: 68 px tall
    Cancel button: 60 px tall (a) Next (b) Cancel (c) Save
37. 37.Which colour pair is easy to read? (a) yellow on white (b) white on dark green (c) dark blue on black (d) red on green
38. 38.🔘 Our rule: buttons are at least 48 px tall. The Save button is 40 px tall. How many px taller must it be?
39. 39.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 52 px tall
    Save button: 52 px tall
    Done button: 32 px tall

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