App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 465 · 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: buttons almost touching is poor button design. (a) True (b) False
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Start button: 36 px tall
   Cancel button: 72 px tall
   Done button: 72 px tall (a) Cancel (b) Start (c) Done
3. 3.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
4. 4.True or false: space between buttons is good button design. (a) True (b) False
5. 5.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
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. Which button is too small?
   Save button: 56 px tall
   Send button: 44 px tall
   Cancel button: 56 px tall
   Help button: 56 px tall (a) Save (b) Cancel (c) Help (d) Send
8. 8.True or false: a tiny 20 px button is good button design. (a) True (b) False
9. 9.Which colour pair is easy to read? (a) yellow on white (b) dark blue on black (c) red on green (d) black on pale grey
10. 10.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
11. 11.🔘 Our rule: buttons are at least 48 px tall. The Help button is 24 px tall. How many px taller must it be?
12. 12.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
13. 13.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
14. 14.🔘 Our rule: buttons are at least 48 px tall. The Done button is 20 px tall. How many px taller must it be?
15. 15.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 40 px tall
    Done button: 48 px tall
    Cancel button: 52 px tall
    Next button: 64 px tall (a) Help (b) Next (c) Done (d) Cancel
16. 16.Which colour pair is easy to read? (a) red on green (b) white on dark green (c) dark blue on black (d) yellow on white
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 36 px tall
    Cancel button: 52 px tall
    Back button: 48 px tall (a) Save (b) Back (c) Cancel
18. 18.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
19. 19.True or false: grey text on grey is good button design. (a) False (b) True
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Save button is 40 px tall. How many px taller must it be?
21. 21.Which colour pair is hard to read? (a) white on dark green (b) dark blue on white (c) black on yellow (d) red on green
22. 22.🌗 Is white on dark green 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. The Send button is 24 px tall. How many px taller must it be?
24. 24.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
25. 25.Which colour pair is easy to read? (a) light grey on white (b) white on black (c) dark blue on black (d) red on green
26. 26.Which colour pair is easy to read? (a) dark blue on white (b) dark blue on black (c) yellow on white (d) light grey on white
27. 27.🔘 Our rule: buttons are at least 48 px tall. The Save button is 32 px tall. How many px taller must it be?
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 56 px tall
    Save button: 24 px tall
    Back button: 64 px tall (a) Save (b) Back (c) Help
29. 29.True or false: buttons almost touching is good button design. (a) False (b) True
30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Next button: 60 px tall
    Send button: 56 px tall
    Save button: 48 px tall
31. 31.Which colour pair is hard to read? (a) white on black (b) white on dark green (c) black on pale grey (d) pale pink on white
32. 32.True or false: grey text on grey is poor button design. (a) False (b) True
33. 33.True or false: a tiny 20 px button is poor button design. (a) False (b) True
34. 34.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 52 px tall
    Help button: 64 px tall
    Next button: 64 px tall
36. 36.Which colour pair is hard to read? (a) black on pale grey (b) light grey on white (c) dark blue on white (d) black on yellow
37. 37.True or false: a big, easy tap area is good button design. (a) False (b) True
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 52 px tall
    Cancel button: 72 px tall
    Start button: 52 px tall
    Help button: 24 px tall (a) Cancel (b) Help (c) Start (d) Next
39. 39.Which colour pair is hard to read? (a) yellow on white (b) dark blue on white (c) black on yellow (d) black on pale grey
40. 40.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 60 px tall
    Help button: 36 px tall
    Send button: 60 px tall (a) Save (b) Send (c) Help

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