App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 231 · 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 Back button is 44 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?
   Send button: 68 px tall
   Help button: 52 px tall
   Start button: 72 px tall
   Cancel button: 32 px tall (a) Cancel (b) Help (c) Start (d) Send
3. 3.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
4. 4.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
5. 5.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Done button: 60 px tall
   Start button: 44 px tall
   Save button: 52 px tall
   Next button: 52 px tall
7. 7.Which colour pair is hard to read? (a) red on green (b) dark blue on white (c) white on dark green (d) black on pale grey
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 px tall. How many px taller must it be?
9. 9.🔘 Our rule: buttons are at least 48 px tall. The Back button is 20 px tall. How many px taller must it be?
10. 10.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
11. 11.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
12. 12.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
13. 13.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 56 px tall
    Done button: 36 px tall
    Send button: 60 px tall (a) Save (b) Send (c) Done
14. 14.True or false: a tiny 20 px button is good button design. (a) True (b) False
15. 15.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 52 px tall
    Save button: 32 px tall
    Help button: 56 px tall
16. 16.True or false: a clear word like Save is poor button design. (a) False (b) True
17. 17.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
18. 18.🔘 Our rule: buttons are at least 48 px tall. The Start button is 32 px tall. How many px taller must it be?
19. 19.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
20. 20.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
21. 21.🔘 Our rule: buttons are at least 48 px tall. The Next button is 40 px tall. How many px taller must it be?
22. 22.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
23. 23.Which colour pair is hard to read? (a) light grey on white (b) black on pale grey (c) white on dark green (d) white on black
24. 24.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
25. 25.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
26. 26.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 56 px tall
    Help button: 32 px tall
    Next button: 40 px tall
    Back button: 48 px tall
27. 27.Which colour pair is easy to read? (a) light grey on white (b) yellow on white (c) black on pale grey (d) pale pink on white
28. 28.Which colour pair is hard to read? (a) black on pale grey (b) white on black (c) dark blue on black (d) black on yellow
29. 29.Which colour pair is hard to read? (a) white on dark green (b) yellow on white (c) white on black (d) dark blue on white
30. 30.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
31. 31.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 32 px tall
    Start button: 56 px tall
    Send button: 52 px tall
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Save button is 40 px tall. How many px taller must it be?
34. 34.True or false: strong colour contrast is good button design. (a) True (b) False
35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 52 px tall
    Done button: 60 px tall
    Help button: 40 px tall
36. 36.Which colour pair is easy to read? (a) red on green (b) black on yellow (c) dark blue on black (d) yellow on white
37. 37.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
38. 38.True or false: strong colour contrast is poor button design. (a) True (b) False
39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 64 px tall
    Back button: 72 px tall
    Cancel button: 36 px tall (a) Cancel (b) Back (c) Next
40. 40.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 72 px tall
    Help button: 52 px tall
    Next button: 24 px tall (a) Send (b) Help (c) Next

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