App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 429 · 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) pale pink on white (b) white on black (c) white on dark green (d) dark blue on white
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 48 px tall
   Cancel button: 64 px tall
   Next button: 40 px tall (a) Save (b) Next (c) Cancel
3. 3.True or false: a tiny 20 px button is good button design. (a) True (b) False
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Help button is 32 px tall. How many px taller must it be?
5. 5.Which colour pair is hard to read? (a) white on black (b) black on yellow (c) black on pale grey (d) light grey on white
6. 6.Which colour pair is hard to read? (a) red on green (b) black on pale grey (c) dark blue on white (d) white on black
7. 7.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Cancel button: 40 px tall
   Help button: 32 px tall
   Back button: 52 px tall
8. 8.Which colour pair is hard to read? (a) black on yellow (b) white on dark green (c) yellow on white (d) black on pale grey
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Help button: 48 px tall
   Cancel button: 36 px tall
   Save button: 40 px tall
   Send button: 48 px tall
10. 10.🌗 Is pale pink on white easy or hard to read on a button? (a) hard to read (b) easy to read
11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 52 px tall
    Save button: 48 px tall
    Start button: 32 px tall
    Back button: 60 px tall (a) Save (b) Next (c) Back (d) Start
12. 12.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 24 px tall
    Start button: 56 px tall
    Cancel button: 72 px tall (a) Cancel (b) Start (c) Save
13. 13.Which colour pair is easy to read? (a) red on green (b) dark blue on black (c) yellow on white (d) white on black
14. 14.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
15. 15.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 56 px tall
    Save button: 64 px tall
    Send button: 56 px tall
    Start button: 56 px tall
17. 17.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
18. 18.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
19. 19.Which colour pair is easy to read? (a) light grey on white (b) pale pink on white (c) red on green (d) white on dark green
20. 20.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
21. 21.🔘 Our rule: buttons are at least 48 px tall. The Back button is 24 px tall. How many px taller must it be?
22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 72 px tall
    Next button: 44 px tall
    Back button: 48 px tall
    Start button: 72 px tall (a) Start (b) Back (c) Next (d) Save
23. 23.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
24. 24.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
25. 25.True or false: a big, easy tap area is good button design. (a) True (b) False
26. 26.True or false: buttons almost touching is poor button design. (a) True (b) False
27. 27.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
28. 28.True or false: a clear word like Save is poor button design. (a) True (b) False
29. 29.🔘 Our rule: buttons are at least 48 px tall. The Save button is 32 px tall. How many px taller must it be?
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 48 px tall
    Next button: 68 px tall
    Back button: 72 px tall
    Done button: 44 px tall (a) Done (b) Next (c) Save (d) Back
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 36 px tall
    Save button: 60 px tall
    Done button: 68 px tall (a) Save (b) Send (c) Done
32. 32.True or false: a tiny 20 px button is poor button design. (a) True (b) False
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Send button is 24 px tall. How many px taller must it be?
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 48 px tall
    Cancel button: 44 px tall
    Start button: 60 px tall (a) Next (b) Cancel (c) Start
35. 35.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
36. 36.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
37. 37.True or false: icons with no meaning is good button design. (a) False (b) True
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 32 px tall
    Done button: 64 px tall
    Back button: 60 px tall
39. 39.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 60 px tall
    Start button: 56 px tall
    Back button: 52 px tall
    Next button: 36 px tall

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students