CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 67 · 40 questions

Code tip (Red, green, blue): rgb(red, green, blue): each from 0 to 255. #rrggbb: the same three numbers in hex. Hex digits: 0–9, then a = 10, b = 11, c = 12, d = 13, e = 14, f = 15. A pair = 16 × first digit + second digit: ff = 16 × 15 + 15 = 255.

1. 1.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 4 (c) 3 (d) 6
2. 2.🌈 Which colour is #00ff00? (a) black (b) cyan (c) bright green (d) blue
3. 3.🌈 Which colour of light is strongest in rgb(128, 233, 15)? (a) red (b) green (c) blue
4. 4.🌈 Which colour is #ff00ff? (a) magenta (b) black (c) bright green (d) cyan
5. 5.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) G (c) Z (d) F
6. 6.🌈 Which colour is rgb(0, 255, 0)? (a) cyan (b) black (c) bright green (d) white
7. 7.🌈 In #630000 the red part is the hex number 63. What is it as a normal number?
8. 8.🌈 Which colour is rgb(255, 0, 255)? (a) bright green (b) black (c) cyan (d) magenta
9. 9.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 255 (c) 99 (d) 1000
10. 10.🌈 In #000032 the blue part is the hex number 32. What is it as a normal number?
11. 11.🌈 Which colour of light is strongest in rgb(31, 182, 85)? (a) blue (b) red (c) green
12. 12.🌈 Which colour is #000000? (a) magenta (b) black (c) red (d) bright green
13. 13.🌈 Which hex code is red? (a) #00ffff (b) #ff00ff (c) #00ff00 (d) #ff0000
14. 14.🌈 Which hex code is blue? (a) #0000ff (b) #00ff00 (c) #000000 (d) #ffff00
15. 15.🌈 In #rrggbb, which colour do the first two digits give? (a) green (b) blue (c) red (d) black
16. 16.🌈 Which colour is rgb(255, 255, 0)? (a) magenta (b) red (c) blue (d) yellow
17. 17.🌈 In #009600 the green part is the hex number 96. What is it as a normal number?
18. 18.🌈 Which colour is rgb(0, 0, 0)? (a) cyan (b) white (c) black (d) blue
19. 19.🌈 In #004e00 the green part is the hex number 4e. What is it as a normal number?
20. 20.🌈 Which colour of light is strongest in rgb(251, 16, 48)? (a) red (b) blue (c) green
21. 21.🌈 In #00b400 the green part is the hex number b4. What is it as a normal number?
22. 22.🌈 Which colour is #0000ff? (a) magenta (b) blue (c) yellow (d) black
23. 23.🌈 Which colour is #ffff00? (a) bright green (b) yellow (c) cyan (d) blue
24. 24.🌈 Which colour of light is strongest in rgb(253, 5, 9)? (a) blue (b) red (c) green
25. 25.🌈 Which colour is rgb(255, 255, 255)? (a) black (b) bright green (c) blue (d) white
26. 26.🌈 Which colour is #ff0000? (a) white (b) red (c) black (d) bright green
27. 27.🌈 Which colour of light is strongest in rgb(194, 0, 107)? (a) green (b) blue (c) red
28. 28.🌈 Which colour of light is strongest in rgb(75, 218, 74)? (a) red (b) green (c) blue
29. 29.🌈 Which colour of light is strongest in rgb(226, 6, 15)? (a) blue (b) green (c) red
30. 30.🌈 Which hex code is bright green? (a) #ffffff (b) #0000ff (c) #ff00ff (d) #00ff00
31. 31.🌈 In #0000a5 the blue part is the hex number a5. What is it as a normal number?
32. 32.🌈 Which colour is rgb(0, 0, 255)? (a) yellow (b) black (c) blue (d) bright green
33. 33.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) blue (c) white (d) red
34. 34.🌈 In #390000 the red part is the hex number 39. What is it as a normal number?
35. 35.🌈 In #000038 the blue part is the hex number 38. What is it as a normal number?
36. 36.🌈 Which colour of light is strongest in rgb(59, 102, 225)? (a) red (b) blue (c) green
37. 37.🌈 Which hex code is black? (a) #ffffff (b) #000000 (c) #ff00ff (d) #00ff00
38. 38.🌈 Which colour of light is strongest in rgb(84, 217, 137)? (a) blue (b) green (c) red
39. 39.🌈 In #00007b the blue part is the hex number 7b. What is it as a normal number?
40. 40.🌈 Which hex code is yellow? (a) #ffff00 (b) #0000ff (c) #ff0000 (d) #000000

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