App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 396 · 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 Start button is 32 px tall. How many px taller must it be?
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 36 px tall
   Done button: 60 px tall
   Cancel button: 52 px tall (a) Done (b) Save (c) Cancel
3. 3.Which colour pair is easy to read? (a) dark blue on black (b) yellow on white (c) light grey on white (d) black on pale grey
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Send button is 20 px tall. How many px taller must it be?
5. 5.Which colour pair is hard to read? (a) dark blue on white (b) black on yellow (c) red on green (d) white on dark green
6. 6.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 64 px tall
   Save button: 52 px tall
   Start button: 40 px tall (a) Start (b) Cancel (c) Save
7. 7.Which colour pair is hard to read? (a) light grey on white (b) white on dark green (c) dark blue on white (d) white on black
8. 8.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
9. 9.Which colour pair is hard to read? (a) pale pink on white (b) black on pale grey (c) black on yellow (d) white on dark green
10. 10.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 44 px tall
    Send button: 56 px tall
    Next button: 68 px tall (a) Send (b) Next (c) Save
11. 11.True or false: grey text on grey is poor button design. (a) True (b) False
12. 12.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) pale pink on white (d) white on dark green
13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 32 px tall
    Save button: 32 px tall
    Start button: 52 px tall
    Help button: 44 px tall
14. 14.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
15. 15.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 56 px tall
    Help button: 52 px tall
    Cancel button: 36 px tall (a) Start (b) Help (c) Cancel
16. 16.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
17. 17.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Cancel button: 40 px tall
    Help button: 64 px tall (a) Help (b) Cancel (c) Save
19. 19.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 28 px tall
    Save button: 56 px tall
    Next button: 48 px tall (a) Save (b) Next (c) Help
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Done button is 40 px tall. How many px taller must it be?
21. 21.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) dark blue on black (d) dark blue on white
22. 22.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
23. 23.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
24. 24.True or false: icons with no meaning is poor button design. (a) False (b) True
25. 25.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 40 px tall. How many px taller must it be?
26. 26.Which colour pair is easy to read? (a) pale pink on white (b) light grey on white (c) dark blue on black (d) white on black
27. 27.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 40 px tall
    Help button: 60 px tall
    Send button: 36 px tall
28. 28.Which colour pair is hard to read? (a) white on dark green (b) dark blue on white (c) white on black (d) dark blue on black
29. 29.True or false: grey text on grey is good button design. (a) True (b) False
30. 30.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 40 px tall
    Send button: 64 px tall
    Cancel button: 48 px tall (a) Next (b) Cancel (c) Send
32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 72 px tall
    Help button: 68 px tall
    Start button: 36 px tall
    Save button: 52 px tall (a) Done (b) Start (c) Help (d) Save
33. 33.True or false: a big, easy tap area is poor button design. (a) True (b) False
34. 34.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
35. 35.🔘 Our rule: buttons are at least 48 px tall. The Help button is 28 px tall. How many px taller must it be?
36. 36.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
37. 37.True or false: a big, easy tap area is good button design. (a) False (b) True
38. 38.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 28 px tall
    Next button: 64 px tall
    Start button: 60 px tall
    Cancel button: 60 px tall (a) Cancel (b) Start (c) Next (d) Help
40. 40.🔘 Our rule: buttons are at least 48 px tall. The Start button is 44 px tall. How many px taller must it be?

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