App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 51 · 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?
   Start button: 36 px tall
   Cancel button: 52 px tall
   Done button: 52 px tall
   Next button: 40 px tall
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Done button: 56 px tall
   Save button: 40 px tall
   Send button: 44 px tall
   Back button: 52 px tall
3. 3.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 48 px tall
   Back button: 60 px tall
   Send button: 72 px tall
   Save button: 24 px tall (a) Back (b) Send (c) Save (d) Cancel
4. 4.True or false: a tiny 20 px button is good button design. (a) True (b) False
5. 5.True or false: a clear word like Save is good button design. (a) True (b) False
6. 6.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
7. 7.True or false: icons with no meaning is good button design. (a) True (b) False
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Back button: 52 px tall
   Save button: 40 px tall
   Start button: 32 px tall
9. 9.True or false: space between buttons is poor button design. (a) False (b) True
10. 10.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 72 px tall
    Cancel button: 40 px tall
    Start button: 56 px tall (a) Help (b) Cancel (c) Start
11. 11.Which colour pair is easy to read? (a) black on yellow (b) pale pink on white (c) red on green (d) yellow on white
12. 12.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
13. 13.True or false: grey text on grey is good button design. (a) True (b) False
14. 14.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 36 px tall
    Start button: 60 px tall
    Done button: 64 px tall
15. 15.Which colour pair is easy to read? (a) yellow on white (b) red on green (c) dark blue on black (d) black on pale grey
16. 16.🔘 Our rule: buttons are at least 48 px tall. The Done button is 40 px tall. How many px taller must it be?
17. 17.Which colour pair is easy to read? (a) pale pink on white (b) white on dark green (c) light grey on white (d) dark blue on black
18. 18.True or false: a tiny 20 px button is poor button design. (a) False (b) True
19. 19.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 52 px tall
    Save button: 40 px tall
    Help button: 60 px tall
20. 20.True or false: buttons almost touching is poor button design. (a) False (b) True
21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 52 px tall
    Start button: 24 px tall
    Send button: 68 px tall (a) Send (b) Start (c) Save
22. 22.Which colour pair is hard to read? (a) white on black (b) white on dark green (c) black on yellow (d) light grey on white
23. 23.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
24. 24.Which colour pair is hard to read? (a) dark blue on white (b) dark blue on black (c) white on dark green (d) white on black
25. 25.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
26. 26.🔘 Is this good or poor button design: strong colour contrast? (a) poor design (b) good design
27. 27.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 28 px tall
    Send button: 64 px tall
    Done button: 72 px tall (a) Done (b) Send (c) Start
29. 29.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 72 px tall
    Done button: 52 px tall
    Cancel button: 40 px tall (a) Cancel (b) Send (c) Done
31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 44 px tall
    Send button: 56 px tall
    Done button: 36 px tall
    Back button: 36 px tall
32. 32.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
33. 33.True or false: a clear word like Save is poor button design. (a) True (b) False
34. 34.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 40 px tall
    Next button: 52 px tall
    Send button: 36 px tall
    Start button: 56 px tall
35. 35.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
36. 36.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 40 px tall
    Back button: 72 px tall
    Help button: 60 px tall (a) Help (b) Back (c) Save
37. 37.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 64 px tall
    Next button: 44 px tall
    Done button: 40 px tall
38. 38.True or false: space between buttons is good button design. (a) False (b) True
39. 39.True or false: strong colour contrast is good button design. (a) False (b) True
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 44 px tall
    Help button: 60 px tall
    Next button: 36 px tall
    Done button: 40 px tall

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