App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 487 · 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 easy to read? (a) white on black (b) dark blue on black (c) light grey on white (d) pale pink on white
2. 2.🌗 Is white on black 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. How many of these buttons follow the rule?
   Back button: 64 px tall
   Next button: 32 px tall
   Start button: 44 px tall
   Help button: 64 px tall
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Back button is 32 px tall. How many px taller must it be?
5. 5.True or false: a clear word like Save is poor button design. (a) False (b) True
6. 6.🌗 Is white on dark green 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. How many of these buttons follow the rule?
   Start button: 36 px tall
   Cancel button: 56 px tall
   Back button: 64 px tall
   Help button: 48 px tall
8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Start button: 48 px tall
   Back button: 36 px tall
   Save button: 56 px tall (a) Back (b) Save (c) Start
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Next button: 32 px tall
   Cancel button: 64 px tall
   Done button: 64 px tall
   Save button: 68 px tall (a) Done (b) Next (c) Cancel (d) Save
10. 10.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
11. 11.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
12. 12.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
13. 13.Which colour pair is hard to read? (a) black on pale grey (b) pale pink on white (c) dark blue on white (d) white on black
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 32 px tall
    Start button: 64 px tall
    Done button: 56 px tall
    Send button: 44 px tall
15. 15.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
16. 16.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
17. 17.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 56 px tall
    Send button: 48 px tall
    Cancel button: 56 px tall
18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 28 px tall
    Send button: 48 px tall
    Save button: 48 px tall (a) Send (b) Back (c) Save
19. 19.Which colour pair is hard to read? (a) white on dark green (b) dark blue on white (c) black on yellow (d) red on green
20. 20.True or false: buttons almost touching is poor button design. (a) True (b) False
21. 21.Which colour pair is hard to read? (a) black on pale grey (b) yellow on white (c) dark blue on white (d) white on dark green
22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 52 px tall
    Help button: 36 px tall
    Next button: 52 px tall (a) Help (b) Back (c) Next
23. 23.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 64 px tall
    Back button: 44 px tall
    Save button: 48 px tall
24. 24.🔘 Our rule: buttons are at least 48 px tall. The Back button is 40 px tall. How many px taller must it be?
25. 25.🔘 Our rule: buttons are at least 48 px tall. The Next button is 44 px tall. How many px taller must it be?
26. 26.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
27. 27.True or false: icons with no meaning is good button design. (a) False (b) True
28. 28.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
29. 29.True or false: grey text on grey is good button design. (a) True (b) False
30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 60 px tall
    Next button: 40 px tall
    Back button: 36 px tall
31. 31.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
32. 32.Which colour pair is easy to read? (a) dark blue on white (b) light grey on white (c) dark blue on black (d) red on green
33. 33.True or false: grey text on grey is poor button design. (a) True (b) False
34. 34.🔘 Our rule: buttons are at least 48 px tall. The Start button is 28 px tall. How many px taller must it be?
35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 40 px tall
    Next button: 52 px tall
    Start button: 48 px tall
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 72 px tall
    Send button: 52 px tall
    Next button: 24 px tall (a) Next (b) Back (c) Send
37. 37.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 60 px tall
    Start button: 64 px tall
    Save button: 52 px tall
    Next button: 24 px tall (a) Done (b) Save (c) Start (d) Next
39. 39.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
40. 40.True or false: a clear word like Save is good button design. (a) False (b) True

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