App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 109 · 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.Which colour pair is hard to read? (a) black on yellow (b) black on pale grey (c) dark blue on white (d) pale pink on white
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 32 px tall
   Back button: 72 px tall
   Start button: 72 px tall
   Send button: 60 px tall (a) Back (b) Send (c) Save (d) Start
3. 3.🔘 Our rule: buttons are at least 48 px tall. The Back button is 36 px tall. How many px taller must it be?
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Send button is 28 px tall. How many px taller must it be?
5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Next button: 48 px tall
   Save button: 40 px tall
   Back button: 60 px tall
   Cancel button: 48 px tall (a) Save (b) Back (c) Cancel (d) Next
6. 6.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
7. 7.Which colour pair is hard to read? (a) white on dark green (b) dark blue on white (c) white on black (d) light grey on white
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.🔘 Our rule: buttons are at least 48 px tall. The Done button is 24 px tall. How many px taller must it be?
10. 10.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
11. 11.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
12. 12.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 52 px tall
    Help button: 32 px tall
    Start button: 56 px tall
    Cancel button: 32 px tall
13. 13.True or false: icons with no meaning is good button design. (a) False (b) True
14. 14.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 32 px tall
    Back button: 52 px tall
    Send button: 64 px tall
    Save button: 56 px tall (a) Done (b) Back (c) Send (d) Save
15. 15.Which colour pair is hard to read? (a) dark blue on white (b) black on yellow (c) dark blue on black (d) white on dark green
16. 16.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 72 px tall
    Cancel button: 56 px tall
    Save button: 48 px tall
    Back button: 36 px tall (a) Save (b) Back (c) Cancel (d) Next
17. 17.True or false: a big, easy tap area is good button design. (a) True (b) False
18. 18.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Back button: 56 px tall
    Done button: 48 px tall
19. 19.True or false: grey text on grey is good button design. (a) True (b) False
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
21. 21.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 64 px tall
    Cancel button: 40 px tall
    Done button: 72 px tall
    Start button: 48 px tall (a) Done (b) Help (c) Start (d) Cancel
23. 23.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
24. 24.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 40 px tall. How many px taller must it be?
25. 25.True or false: space between buttons is poor button design. (a) True (b) False
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?
27. 27.True or false: grey text on grey is poor button design. (a) False (b) True
28. 28.🔘 Our rule: buttons are at least 48 px tall. The Start button is 20 px tall. How many px taller must it be?
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Cancel button: 40 px tall
    Help button: 52 px tall
30. 30.True or false: a clear word like Save is poor button design. (a) True (b) False
31. 31.True or false: a tiny 20 px button is good button design. (a) True (b) False
32. 32.Which colour pair is easy to read? (a) light grey on white (b) white on dark green (c) red on green (d) dark blue on black
33. 33.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 68 px tall
    Cancel button: 44 px tall
    Send button: 64 px tall (a) Send (b) Cancel (c) Start
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 24 px tall
    Save button: 68 px tall
    Send button: 72 px tall (a) Save (b) Send (c) Start
35. 35.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 28 px tall
    Back button: 56 px tall
    Send button: 48 px tall (a) Back (b) Cancel (c) Send
37. 37.🔘 Our rule: buttons are at least 48 px tall. The Save button is 24 px tall. How many px taller must it be?
38. 38.Which colour pair is easy to read? (a) red on green (b) black on yellow (c) dark blue on black (d) yellow on white
39. 39.Which colour pair is easy to read? (a) yellow on white (b) pale pink on white (c) red on green (d) white on black
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 52 px tall
    Send button: 40 px tall
    Save button: 32 px tall

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