App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 539 · 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 Next button is 20 px tall. How many px taller must it be?
2. 2.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
3. 3.🔘 Our rule: buttons are at least 48 px tall. The Help button is 40 px tall. How many px taller must it be?
4. 4.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Next button: 44 px tall
   Done button: 40 px tall
   Send button: 44 px tall
   Cancel button: 64 px tall
5. 5.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
6. 6.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
7. 7.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Next button: 52 px tall
   Send button: 72 px tall
   Back button: 28 px tall (a) Send (b) Back (c) Next
8. 8.True or false: a big, easy tap area is poor button design. (a) False (b) True
9. 9.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
10. 10.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
11. 11.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
12. 12.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 32 px tall
    Cancel button: 60 px tall
    Done button: 36 px tall
14. 14.🌗 Is yellow 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. The Save button is 20 px tall. How many px taller must it be?
16. 16.Which colour pair is easy to read? (a) red on green (b) dark blue on white (c) light grey on white (d) dark blue on black
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 52 px tall
    Help button: 48 px tall
    Cancel button: 24 px tall (a) Help (b) Cancel (c) Send
18. 18.True or false: a clear word like Save is poor button design. (a) True (b) False
19. 19.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
20. 20.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
21. 21.Which colour pair is easy to read? (a) white on black (b) yellow on white (c) pale pink on white (d) light grey on white
22. 22.Which colour pair is hard to read? (a) yellow on white (b) dark blue on white (c) white on dark green (d) white on black
23. 23.True or false: a tiny 20 px button is good button design. (a) True (b) False
24. 24.Which colour pair is easy to read? (a) light grey on white (b) red on green (c) black on yellow (d) dark blue on black
25. 25.🔘 Our rule: buttons are at least 48 px tall. The Back button is 28 px tall. How many px taller must it be?
26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 60 px tall
    Next button: 60 px tall
    Done button: 36 px tall
    Send button: 52 px tall (a) Next (b) Done (c) Send (d) Back
27. 27.🔘 Our rule: buttons are at least 48 px tall. The Save button is 44 px tall. How many px taller must it be?
28. 28.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
29. 29.Which colour pair is hard to read? (a) white on dark green (b) light grey on white (c) white on black (d) black on yellow
30. 30.🔘 Our rule: buttons are at least 48 px tall. The Back button is 20 px tall. How many px taller must it be?
31. 31.Which colour pair is easy to read? (a) white on dark green (b) red on green (c) dark blue on black (d) light grey on white
32. 32.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 64 px tall
    Back button: 40 px tall
    Save button: 64 px tall
    Cancel button: 52 px tall (a) Send (b) Back (c) Cancel (d) Save
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Send button is 20 px tall. How many px taller must it be?
34. 34.🌗 Is dark blue on black 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. Which button is too small?
    Send button: 68 px tall
    Save button: 68 px tall
    Start button: 28 px tall
    Next button: 68 px tall (a) Start (b) Next (c) Save (d) Send
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 32 px tall
    Back button: 64 px tall
    Done button: 52 px tall (a) Save (b) Done (c) Back
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 48 px tall
    Next button: 72 px tall
    Send button: 32 px tall
    Help button: 52 px tall (a) Help (b) Next (c) Send (d) Back
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 64 px tall
    Back button: 44 px tall
    Save button: 44 px tall
    Done button: 48 px tall
39. 39.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 36 px tall
    Help button: 48 px tall
    Next button: 60 px tall
40. 40.True or false: space between buttons is good button design. (a) True (b) False

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