CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 229 · 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.🌈 Which hex code is black? (a) #ffffff (b) #0000ff (c) #00ff00 (d) #000000
2. 2.🌈 Which colour is rgb(255, 255, 255)? (a) bright green (b) white (c) yellow (d) black
3. 3.🌈 Which colour is rgb(255, 0, 0)? (a) bright green (b) white (c) red (d) black
4. 4.🌈 Which colour is rgb(255, 0, 255)? (a) black (b) bright green (c) blue (d) magenta
5. 5.🌈 Which colour is #ff0000? (a) bright green (b) yellow (c) red (d) cyan
6. 6.🌈 What is the biggest number one colour can have in rgb()? (a) 1000 (b) 99 (c) 100 (d) 255
7. 7.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) green (c) red (d) blue
8. 8.🌈 Which colour of light is strongest in rgb(173, 93, 97)? (a) blue (b) green (c) red
9. 9.🌈 In #0000be the blue part is the hex number be. What is it as a normal number?
10. 10.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 2 (c) 3 (d) 6
11. 11.🌈 Which hex code is cyan? (a) #ff0000 (b) #ff00ff (c) #000000 (d) #00ffff
12. 12.🌈 Which colour is #00ff00? (a) bright green (b) magenta (c) black (d) white
13. 13.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) bright green (c) black (d) yellow
14. 14.🌈 In #002d00 the green part is the hex number 2d. What is it as a normal number?
15. 15.🌈 Which colour of light is strongest in rgb(41, 22, 171)? (a) green (b) blue (c) red
16. 16.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) red (c) blue (d) white
17. 17.🌈 Which colour is #ff00ff? (a) red (b) magenta (c) yellow (d) cyan
18. 18.🌈 Which colour is rgb(0, 0, 0)? (a) red (b) magenta (c) black (d) blue
19. 19.🌈 Which hex code is bright green? (a) #00ff00 (b) #000000 (c) #0000ff (d) #ffffff
20. 20.🌈 Which colour of light is strongest in rgb(210, 85, 120)? (a) blue (b) red (c) green
21. 21.🌈 Which colour is #0000ff? (a) red (b) black (c) blue (d) white
22. 22.🌈 Which colour of light is strongest in rgb(28, 4, 233)? (a) green (b) red (c) blue
23. 23.🌈 Which colour of light is strongest in rgb(27, 151, 46)? (a) blue (b) red (c) green
24. 24.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) J (c) F (d) G
25. 25.🌈 Which hex code is white? (a) #ff0000 (b) #ffffff (c) #00ffff (d) #00ff00
26. 26.🌈 Which colour is #ffffff? (a) bright green (b) cyan (c) white (d) yellow
27. 27.🌈 In #320000 the red part is the hex number 32. What is it as a normal number?
28. 28.🌈 Which colour is rgb(0, 255, 0)? (a) white (b) bright green (c) red (d) blue
29. 29.🌈 Which colour is rgb(0, 255, 255)? (a) blue (b) red (c) white (d) cyan
30. 30.🌈 In #00005f the blue part is the hex number 5f. What is it as a normal number?
31. 31.🌈 In #006200 the green part is the hex number 62. What is it as a normal number?
32. 32.🌈 Which colour of light is strongest in rgb(29, 31, 235)? (a) red (b) green (c) blue
33. 33.🌈 Which colour is #000000? (a) black (b) bright green (c) magenta (d) red
34. 34.🌈 Which colour of light is strongest in rgb(135, 190, 9)? (a) green (b) red (c) blue
35. 35.🌈 Which colour of light is strongest in rgb(203, 122, 123)? (a) blue (b) red (c) green
36. 36.🌈 In #f50000 the red part is the hex number f5. What is it as a normal number?
37. 37.🌈 In #0000ea the blue part is the hex number ea. What is it as a normal number?
38. 38.🌈 In #760000 the red part is the hex number 76. What is it as a normal number?
39. 39.🌈 Which colour of light is strongest in rgb(151, 2, 100)? (a) blue (b) red (c) green
40. 40.🌈 In #0000bf the blue part is the hex number bf. What is it as a normal number?

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