App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 665 · 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: 44 px tall
   Start button: 48 px tall
   Cancel button: 64 px tall
   Help button: 56 px tall
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Help button: 24 px tall
   Start button: 60 px tall
   Done button: 72 px tall
   Send button: 64 px tall (a) Help (b) Done (c) Start (d) Send
3. 3.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Help button: 44 px tall
   Start button: 56 px tall
   Back button: 40 px tall
4. 4.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
5. 5.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
6. 6.True or false: strong colour contrast is good button design. (a) True (b) False
7. 7.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Back button: 60 px tall
   Next button: 52 px tall
   Cancel button: 44 px tall
   Send button: 52 px tall (a) Send (b) Back (c) Cancel (d) Next
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Next button: 60 px tall
   Send button: 52 px tall
   Start button: 52 px tall
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 32 px tall
   Start button: 32 px tall
   Done button: 64 px tall
   Next button: 60 px tall
10. 10.🔘 Our rule: buttons are at least 48 px tall. The Send button is 36 px tall. How many px taller must it be?
11. 11.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
12. 12.Which colour pair is hard to read? (a) black on yellow (b) light grey on white (c) black on pale grey (d) dark blue on white
13. 13.🌗 Is white on dark green easy or hard to read on a button? (a) easy to read (b) hard to read
14. 14.🔘 Our rule: buttons are at least 48 px tall. The Start button is 40 px tall. How many px taller must it be?
15. 15.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) dark blue on black (d) white on dark green
16. 16.True or false: a clear word like Save is poor button design. (a) True (b) False
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 44 px tall
    Cancel button: 52 px tall
    Send button: 72 px tall
    Save button: 52 px tall (a) Save (b) Cancel (c) Send (d) Help
18. 18.True or false: buttons almost touching is good button design. (a) True (b) False
19. 19.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
20. 20.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
21. 21.Which colour pair is hard to read? (a) dark blue on white (b) white on dark green (c) dark blue on black (d) black on yellow
22. 22.True or false: grey text on grey is poor button design. (a) False (b) True
23. 23.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
24. 24.Which colour pair is hard to read? (a) yellow on white (b) black on yellow (c) dark blue on white (d) white on black
25. 25.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Done button is 28 px tall. How many px taller must it be?
27. 27.True or false: strong colour contrast is poor button design. (a) True (b) False
28. 28.🔘 Our rule: buttons are at least 48 px tall. The Back button is 20 px tall. How many px taller must it be?
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 48 px tall
    Send button: 44 px tall
    Save button: 44 px tall
    Help button: 36 px tall
30. 30.🔘 Our rule: buttons are at least 48 px tall. The Send button is 32 px tall. How many px taller must it be?
31. 31.True or false: grey text on grey is good button design. (a) True (b) False
32. 32.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
33. 33.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Help button: 48 px tall
    Back button: 52 px tall
    Start button: 48 px tall
34. 34.Which colour pair is easy to read? (a) dark blue on white (b) red on green (c) dark blue on black (d) light grey on white
35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 40 px tall
    Save button: 32 px tall
    Done button: 48 px tall
    Start button: 36 px tall
36. 36.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 40 px tall
    Cancel button: 72 px tall
    Send button: 64 px tall
    Help button: 60 px tall (a) Cancel (b) Help (c) Back (d) Send
38. 38.True or false: a big, easy tap area is poor button design. (a) True (b) False
39. 39.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 56 px tall
    Cancel button: 36 px tall
    Back button: 44 px tall
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Help button: 40 px tall
    Done button: 56 px tall
    Next button: 32 px tall

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