App Dev Worksheet: Button Size and Contrast

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

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