App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 232 · 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 white on black easy or hard to read on a button? (a) easy to read (b) hard to read
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 60 px tall
   Help button: 64 px tall
   Next button: 28 px tall (a) Next (b) Save (c) Help
3. 3.True or false: a clear word like Save is poor button design. (a) True (b) False
4. 4.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
5. 5.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Next button: 32 px tall
   Send button: 52 px tall
   Done button: 48 px tall
   Cancel button: 60 px tall
6. 6.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
7. 7.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Cancel button: 36 px tall
   Next button: 60 px tall
   Send button: 56 px tall
9. 9.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
10. 10.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?
11. 11.True or false: icons with no meaning is good button design. (a) False (b) True
12. 12.True or false: a clear word like Save is good button design. (a) True (b) False
13. 13.Which colour pair is easy to read? (a) light grey on white (b) red on green (c) black on pale grey (d) yellow on white
14. 14.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
15. 15.🔘 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
    Back button: 36 px tall
16. 16.🔘 Our rule: buttons are at least 48 px tall. The Help button is 44 px tall. How many px taller must it be?
17. 17.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
18. 18.True or false: a big, easy tap area is poor button design. (a) False (b) True
19. 19.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
20. 20.True or false: a big, easy tap area is good button design. (a) False (b) True
21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 28 px tall
    Done button: 56 px tall
    Send button: 56 px tall (a) Send (b) Done (c) Next
22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 52 px tall
    Start button: 72 px tall
    Help button: 36 px tall (a) Next (b) Start (c) Help
23. 23.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 48 px tall
    Start button: 60 px tall
    Send button: 32 px tall
    Save button: 64 px tall (a) Start (b) Send (c) Back (d) Save
25. 25.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 32 px tall
    Help button: 60 px tall
    Start button: 56 px tall (a) Done (b) Help (c) Start
26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 60 px tall
    Cancel button: 32 px tall
    Done button: 60 px tall
    Save button: 56 px tall (a) Cancel (b) Done (c) Back (d) Save
27. 27.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
28. 28.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 32 px tall
    Back button: 48 px tall
    Next button: 60 px tall
    Save button: 32 px tall
30. 30.Which colour pair is easy to read? (a) black on yellow (b) red on green (c) yellow on white (d) dark blue on black
31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 44 px tall
    Cancel button: 52 px tall
    Next button: 52 px tall
    Save button: 64 px tall
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 px tall. How many px taller must it be?
33. 33.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 60 px tall
    Next button: 32 px tall
    Cancel button: 32 px tall
    Save button: 52 px tall
34. 34.True or false: strong colour contrast is poor button design. (a) False (b) True
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 48 px tall
    Back button: 52 px tall
    Start button: 24 px tall (a) Back (b) Done (c) Start
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Back button is 44 px tall. How many px taller must it be?
37. 37.🔘 Our rule: buttons are at least 48 px tall. The Send button is 28 px tall. How many px taller must it be?
38. 38.True or false: grey text on grey is poor button design. (a) True (b) False
39. 39.Which colour pair is easy to read? (a) dark blue on white (b) pale pink on white (c) light grey on white (d) dark blue on black
40. 40.Which colour pair is hard to read? (a) light grey on white (b) black on yellow (c) black on pale grey (d) white on dark green

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