App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 152 · 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. The Done button is 28 px tall. How many px taller must it be?
2. 2.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
3. 3.Which colour pair is easy to read? (a) dark blue on black (b) yellow on white (c) red on green (d) black on pale grey
4. 4.Which colour pair is hard to read? (a) black on pale grey (b) dark blue on white (c) yellow on white (d) black on yellow
5. 5.🔘 Our rule: buttons are at least 48 px tall. The Next button is 32 px tall. How many px taller must it be?
6. 6.🔘 Our rule: buttons are at least 48 px tall. The Start button is 32 px tall. How many px taller must it be?
7. 7.True or false: grey text on grey is good button design. (a) True (b) False
8. 8.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
9. 9.Which colour pair is easy to read? (a) pale pink on white (b) light grey on white (c) red on green (d) white on dark green
10. 10.Which colour pair is hard to read? (a) dark blue on black (b) white on dark green (c) dark blue on white (d) black on yellow
11. 11.True or false: a clear word like Save is poor button design. (a) True (b) False
12. 12.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
13. 13.Which colour pair is hard to read? (a) white on dark green (b) red on green (c) white on black (d) black on pale grey
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 44 px tall
    Help button: 56 px tall
    Start button: 44 px tall
15. 15.Which colour pair is easy to read? (a) white on black (b) dark blue on black (c) red on green (d) light grey on white
16. 16.🔘 Our rule: buttons are at least 48 px tall. The Save button is 40 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?
    Back button: 72 px tall
    Start button: 72 px tall
    Send button: 32 px tall (a) Send (b) Start (c) Back
18. 18.True or false: grey text on grey is poor button design. (a) False (b) True
19. 19.True or false: strong colour contrast is good button design. (a) True (b) False
20. 20.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design
21. 21.🔘 Our rule: buttons are at least 48 px tall. The Save button is 24 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) hard to read (b) easy to read
23. 23.True or false: icons with no meaning is good 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.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
26. 26.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
27. 27.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 48 px tall
    Cancel button: 32 px tall
    Done button: 40 px tall
    Save button: 40 px tall
28. 28.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 72 px tall
    Back button: 44 px tall
    Send button: 68 px tall (a) Send (b) Help (c) Back
30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 48 px tall
    Help button: 60 px tall
    Start button: 36 px tall
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 48 px tall
    Done button: 52 px tall
    Help button: 64 px tall
    Back button: 36 px tall (a) Help (b) Back (c) Cancel (d) Done
32. 32.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Back button is 32 px tall. How many px taller must it be?
34. 34.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 48 px tall
    Back button: 36 px tall
    Send button: 44 px tall
    Next button: 32 px tall
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Done button: 48 px tall
    Start button: 24 px tall (a) Done (b) Start (c) Cancel
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 48 px tall
    Cancel button: 40 px tall
    Done button: 56 px tall (a) Cancel (b) Save (c) Done
37. 37.True or false: a tiny 20 px button is good button design. (a) False (b) True
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Next button: 68 px tall
    Done button: 48 px tall
    Help button: 36 px tall (a) Next (b) Done (c) Help (d) Cancel
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 72 px tall
    Save button: 48 px tall
    Back button: 32 px tall
    Cancel button: 72 px tall (a) Cancel (b) Back (c) Save (d) Start
40. 40.🔘 Our rule: buttons are at least 48 px tall. The Done button is 32 px tall. How many px taller must it be?

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