App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 350 · 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. Which button is too small?
   Back button: 32 px tall
   Next button: 68 px tall
   Help button: 52 px tall
   Cancel button: 48 px tall (a) Next (b) Cancel (c) Help (d) Back
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 44 px tall
   Cancel button: 40 px tall
   Back button: 40 px tall
   Done button: 56 px tall
3. 3.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Back button is 40 px tall. How many px taller must it be?
5. 5.True or false: buttons almost touching is good button design. (a) True (b) False
6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Done button: 64 px tall
   Back button: 36 px tall
   Help button: 40 px tall
   Save button: 48 px tall
7. 7.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Back button: 60 px tall
   Cancel button: 72 px tall
   Start button: 36 px tall
   Help button: 56 px tall (a) Cancel (b) Help (c) Back (d) Start
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
9. 9.Which colour pair is easy to read? (a) pale pink on white (b) yellow on white (c) black on yellow (d) red on green
10. 10.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 32 px tall
    Cancel button: 36 px tall
    Next button: 52 px tall
    Back button: 40 px tall
11. 11.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
12. 12.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 44 px tall. How many px taller must it be?
13. 13.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
14. 14.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
15. 15.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
16. 16.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
17. 17.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
18. 18.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
19. 19.True or false: space between buttons is good button design. (a) True (b) False
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Back button is 36 px tall. How many px taller must it be?
21. 21.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
22. 22.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
23. 23.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 48 px tall
    Help button: 36 px tall
    Start button: 60 px tall
24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 28 px tall
    Next button: 68 px tall
    Start button: 60 px tall
    Back button: 64 px tall (a) Next (b) Send (c) Back (d) Start
25. 25.Which colour pair is hard to read? (a) dark blue on white (b) black on yellow (c) yellow on white (d) black on pale grey
26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 48 px tall
    Back button: 68 px tall
    Cancel button: 56 px tall
    Start button: 36 px tall (a) Start (b) Help (c) Cancel (d) Back
27. 27.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
28. 28.True or false: buttons almost touching is poor button design. (a) False (b) True
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 24 px tall
    Start button: 60 px tall
    Help button: 64 px tall (a) Start (b) Help (c) Cancel
30. 30.Which colour pair is easy to read? (a) dark blue on white (b) dark blue on black (c) yellow on white (d) light grey on white
31. 31.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
32. 32.Which colour pair is easy to read? (a) dark blue on black (b) light grey on white (c) black on pale grey (d) yellow on white
33. 33.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 56 px tall
    Next button: 40 px tall
    Done button: 64 px tall
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 32 px tall
    Next button: 48 px tall
    Save button: 68 px tall
    Start button: 48 px tall (a) Next (b) Start (c) Cancel (d) Save
35. 35.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
36. 36.True or false: a tiny 20 px button is poor button design. (a) True (b) False
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?
    Cancel button: 32 px tall
    Help button: 52 px tall
    Next button: 36 px tall
    Back button: 36 px tall
39. 39.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 60 px tall
    Start button: 44 px tall
    Cancel button: 60 px tall
40. 40.True or false: a big, easy tap area is poor button design. (a) True (b) False

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