App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 632 · 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.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
2. 2.Which colour pair is easy to read? (a) yellow on white (b) dark blue on black (c) black on yellow (d) red on green
3. 3.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 44 px tall
   Save button: 48 px tall
   Done button: 48 px tall (a) Done (b) Save (c) Cancel
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Next button is 40 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: 36 px tall
   Save button: 40 px tall
   Done button: 32 px tall
   Send button: 56 px tall
6. 6.True or false: a clear word like Save is good button design. (a) False (b) True
7. 7.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 32 px tall
   Cancel button: 44 px tall
   Start button: 44 px tall
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?
9. 9.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
10. 10.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
11. 11.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) light grey on white (d) dark blue on white
12. 12.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Done button: 48 px tall
    Help button: 40 px tall
13. 13.🔘 Our rule: buttons are at least 48 px tall. The Send button is 40 px tall. How many px taller must it be?
14. 14.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 44 px tall
    Send button: 60 px tall
    Next button: 72 px tall (a) Next (b) Save (c) Send
15. 15.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
16. 16.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
17. 17.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
18. 18.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
19. 19.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
20. 20.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 44 px tall
    Start button: 40 px tall
    Next button: 44 px tall
    Help button: 36 px tall
21. 21.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) white on dark green (d) red on green
22. 22.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
23. 23.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
24. 24.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
25. 25.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) white on black (d) light grey on white
26. 26.Which colour pair is easy to read? (a) dark blue on black (b) white on black (c) pale pink on white (d) light grey on white
27. 27.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
28. 28.Which colour pair is easy to read? (a) dark blue on black (b) red on green (c) pale pink on white (d) black on pale grey
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 72 px tall
    Send button: 60 px tall
    Back button: 72 px tall
    Done button: 44 px tall (a) Send (b) Start (c) Done (d) Back
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 28 px tall
    Cancel button: 60 px tall
    Save button: 48 px tall (a) Cancel (b) Back (c) Save
31. 31.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
32. 32.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Send button is 44 px tall. How many px taller must it be?
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 64 px tall
    Cancel button: 48 px tall
    Help button: 36 px tall (a) Cancel (b) Save (c) Help
35. 35.Which colour pair is hard to read? (a) dark blue on black (b) white on dark green (c) white on black (d) black on pale grey
36. 36.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 48 px tall
    Back button: 64 px tall
    Save button: 40 px tall
    Cancel button: 32 px tall
37. 37.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
38. 38.Which colour pair is hard to read? (a) black on yellow (b) white on black (c) yellow on white (d) white on dark green
39. 39.Which colour pair is hard to read? (a) black on pale grey (b) white on dark green (c) red on green (d) white on black
40. 40.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 24 px tall
    Done button: 56 px tall
    Back button: 60 px tall
    Next button: 68 px tall (a) Done (b) Back (c) Next (d) Cancel

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