App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 90 · 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?
   Next button: 32 px tall
   Help button: 64 px tall
   Cancel button: 52 px tall
   Back button: 40 px tall
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 60 px tall
   Help button: 64 px tall
   Back button: 32 px tall
   Send button: 72 px tall (a) Send (b) Back (c) Save (d) Help
3. 3.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
4. 4.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
5. 5.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Cancel button: 48 px tall
   Done button: 64 px tall
   Start button: 60 px tall
   Next button: 56 px tall
6. 6.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
7. 7.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
8. 8.🔘 Our rule: buttons are at least 48 px tall. The Start button is 32 px tall. How many px taller must it be?
9. 9.🌗 Is yellow on white easy or hard to read on a button? (a) easy to read (b) hard to read
10. 10.🔘 Our rule: buttons are at least 48 px tall. The Back button is 24 px tall. How many px taller must it be?
11. 11.True or false: a big, easy tap area is poor button design. (a) True (b) False
12. 12.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
13. 13.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 40 px tall
    Back button: 48 px tall
    Done button: 48 px tall (a) Done (b) Start (c) Back
14. 14.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
15. 15.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 64 px tall
    Back button: 48 px tall
    Help button: 40 px tall
    Save button: 68 px tall (a) Back (b) Save (c) Send (d) Help
16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 56 px tall
    Back button: 48 px tall
    Save button: 52 px tall
17. 17.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 64 px tall
    Help button: 32 px tall
    Send button: 64 px tall
    Save button: 44 px tall
18. 18.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
19. 19.🌗 Is white on dark green 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. How many of these buttons follow the rule?
    Send button: 60 px tall
    Done button: 64 px tall
    Back button: 60 px tall
21. 21.True or false: strong colour contrast is poor button design. (a) False (b) True
22. 22.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
23. 23.True or false: a tiny 20 px button is good button design. (a) True (b) False
24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 60 px tall
    Send button: 40 px tall
    Next button: 64 px tall
    Save button: 60 px tall
25. 25.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 52 px tall
    Save button: 36 px tall
    Start button: 52 px tall (a) Start (b) Back (c) Save
26. 26.Which colour pair is easy to read? (a) dark blue on black (b) red on green (c) yellow on white (d) black on yellow
27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 32 px tall
    Send button: 48 px tall
    Back button: 64 px tall
    Cancel button: 52 px tall (a) Send (b) Back (c) Cancel (d) Save
28. 28.Which colour pair is hard to read? (a) black on pale grey (b) dark blue on white (c) red on green (d) white on dark green
29. 29.🔘 Our rule: buttons are at least 48 px tall. The Send 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?
    Back button: 64 px tall
    Start button: 40 px tall
    Help button: 32 px tall
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 36 px tall
    Back button: 48 px tall
    Cancel button: 68 px tall
    Send button: 56 px tall (a) Cancel (b) Back (c) Send (d) Done
32. 32.🔘 Our rule: buttons are at least 48 px tall. The Done button is 20 px tall. How many px taller must it be?
33. 33.True or false: grey text on grey is poor button design. (a) False (b) True
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 44 px tall
    Next button: 68 px tall
    Send button: 68 px tall (a) Save (b) Next (c) Send
35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 44 px tall
    Done button: 32 px tall
    Start button: 40 px tall
    Cancel button: 40 px tall
36. 36.True or false: buttons almost touching is poor button design. (a) True (b) False
37. 37.Which colour pair is hard to read? (a) black on yellow (b) dark blue on white (c) dark blue on black (d) black on pale grey
38. 38.True or false: icons with no meaning is poor button design. (a) False (b) True
39. 39.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
40. 40.Which colour pair is hard to read? (a) black on pale grey (b) white on black (c) pale pink on white (d) white on dark green

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