App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 387 · 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. How many of these buttons follow the rule?
   Back button: 44 px tall
   Save button: 52 px tall
   Send button: 40 px tall
   Cancel button: 40 px tall
2. 2.True or false: a big, easy tap area is good button design. (a) False (b) True
3. 3.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Done button: 24 px tall
   Save button: 48 px tall
   Help button: 60 px tall (a) Save (b) Help (c) Done
4. 4.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 56 px tall
   Back button: 60 px tall
   Save button: 56 px tall
5. 5.Which colour pair is easy to read? (a) pale pink on white (b) yellow on white (c) dark blue on black (d) black on pale grey
6. 6.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
7. 7.True or false: grey text on grey is good button design. (a) True (b) False
8. 8.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
9. 9.True or false: space between buttons is good button design. (a) False (b) True
10. 10.Which colour pair is easy to read? (a) dark blue on black (b) yellow on white (c) black on yellow (d) pale pink on white
11. 11.Which colour pair is hard to read? (a) white on dark green (b) black on pale grey (c) red on green (d) black on yellow
12. 12.Which colour pair is hard to read? (a) dark blue on white (b) black on yellow (c) white on dark green (d) pale pink on white
13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 48 px tall
    Save button: 64 px tall
    Help button: 32 px tall
    Start button: 40 px tall
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 52 px tall
    Next button: 36 px tall
    Send button: 44 px tall
15. 15.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
16. 16.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
17. 17.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
18. 18.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 32 px tall
    Done button: 44 px tall
    Help button: 60 px tall
19. 19.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 64 px tall
    Send button: 48 px tall
    Cancel button: 48 px tall
20. 20.True or false: a clear word like Save is poor button design. (a) True (b) False
21. 21.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
22. 22.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 60 px tall
    Done button: 52 px tall
    Save button: 60 px tall
23. 23.Which colour pair is hard to read? (a) white on dark green (b) white on black (c) light grey on white (d) black on pale grey
24. 24.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
25. 25.Which colour pair is easy to read? (a) dark blue on black (b) red on green (c) light grey on white (d) dark blue on white
26. 26.Which colour pair is easy to read? (a) pale pink on white (b) white on dark green (c) dark blue on black (d) light grey on white
27. 27.True or false: icons with no meaning is poor button design. (a) False (b) True
28. 28.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 32 px tall
    Send button: 64 px tall
    Back button: 36 px tall
    Save button: 64 px tall
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 48 px tall
    Cancel button: 28 px tall
    Done button: 48 px tall
    Start button: 68 px tall (a) Start (b) Done (c) Cancel (d) Send
30. 30.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
31. 31.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 32 px tall. How many px taller must it be?
33. 33.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
34. 34.True or false: a big, easy tap area is poor button design. (a) False (b) True
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 68 px tall
    Cancel button: 52 px tall
    Back button: 72 px tall
    Save button: 24 px tall (a) Cancel (b) Send (c) Back (d) Save
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 68 px tall
    Back button: 36 px tall
    Cancel button: 64 px tall
    Send button: 48 px tall (a) Back (b) Next (c) Cancel (d) Send
37. 37.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Done button: 64 px tall
    Start button: 36 px tall
38. 38.True or false: a clear word like Save is good button design. (a) False (b) True
39. 39.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 36 px tall. How many px taller must it be?
40. 40.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design

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