App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 104 · 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 dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Help button: 52 px tall
   Cancel button: 48 px tall
   Save button: 32 px tall
   Done button: 68 px tall (a) Done (b) Cancel (c) Save (d) Help
3. 3.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Help button: 48 px tall
   Save button: 32 px tall
   Next button: 36 px tall
4. 4.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Back button: 28 px tall
   Done button: 52 px tall
   Next button: 56 px tall (a) Next (b) Back (c) Done
6. 6.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Back button: 60 px tall
   Next button: 72 px tall
   Cancel button: 60 px tall
   Help button: 24 px tall (a) Back (b) Help (c) Cancel (d) Next
7. 7.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) white on dark green (d) red on green
8. 8.Which colour pair is easy to read? (a) light grey on white (b) dark blue on black (c) black on pale grey (d) yellow on white
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Start button: 32 px tall
   Send button: 44 px tall
   Done button: 36 px tall
   Next button: 32 px tall
10. 10.True or false: buttons almost touching is poor button design. (a) True (b) False
11. 11.Which colour pair is hard to read? (a) white on black (b) white on dark green (c) black on pale grey (d) dark blue on black
12. 12.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
13. 13.True or false: space between buttons is poor button design. (a) False (b) True
14. 14.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
15. 15.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 44 px tall
    Done button: 60 px tall
    Cancel button: 60 px tall
16. 16.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
17. 17.True or false: a big, easy tap area is good button design. (a) False (b) True
18. 18.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
19. 19.True or false: grey text on grey is poor button design. (a) True (b) False
20. 20.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
21. 21.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 52 px tall
    Save button: 32 px tall
    Start button: 40 px tall
    Back button: 36 px tall
22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 64 px tall
    Cancel button: 52 px tall
    Send button: 52 px tall
    Next button: 60 px tall
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 32 px tall
    Back button: 48 px tall
    Help button: 72 px tall (a) Help (b) Back (c) Next
24. 24.🌗 Is yellow on white 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: icons with no meaning? (a) poor design (b) good design
26. 26.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 44 px tall
    Save button: 52 px tall
    Back button: 40 px tall
    Cancel button: 52 px tall
27. 27.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
28. 28.True or false: icons with no meaning is poor button design. (a) False (b) True
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 68 px tall
    Cancel button: 40 px tall
    Next button: 72 px tall
    Start button: 56 px tall (a) Cancel (b) Start (c) Next (d) Back
30. 30.Which colour pair is easy to read? (a) red on green (b) light grey on white (c) yellow on white (d) white on dark green
31. 31.🔘 Our rule: buttons are at least 48 px tall. The Back button is 44 px tall. How many px taller must it be?
32. 32.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Help button is 36 px tall. How many px taller must it be?
34. 34.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 32 px tall
    Send button: 32 px tall
    Help button: 40 px tall
    Done button: 48 px tall
36. 36.Which colour pair is hard to read? (a) black on pale grey (b) yellow on white (c) white on black (d) black on yellow
37. 37.Which colour pair is easy to read? (a) dark blue on black (b) yellow on white (c) light grey on white (d) white on black
38. 38.🔘 Our rule: buttons are at least 48 px tall. The Send button is 40 px tall. How many px taller must it be?
39. 39.🔘 Our rule: buttons are at least 48 px tall. The Back button is 32 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?
    Done button: 52 px tall
    Back button: 48 px tall
    Save button: 44 px tall
    Help button: 44 px tall

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