CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 343 · 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) 6 (b) 3 (c) 4 (d) 2
2. 2.🌈 Which hex code is cyan? (a) #0000ff (b) #00ffff (c) #000000 (d) #00ff00
3. 3.🌈 Which hex code is bright green? (a) #000000 (b) #ffffff (c) #ff0000 (d) #00ff00
4. 4.🌈 Which colour of light is strongest in rgb(19, 197, 110)? (a) red (b) blue (c) green
5. 5.🌈 Which colour of light is strongest in rgb(96, 225, 69)? (a) red (b) green (c) blue
6. 6.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) white (c) red (d) green
7. 7.🌈 Which colour of light is strongest in rgb(34, 29, 171)? (a) red (b) blue (c) green
8. 8.🌈 Which colour is rgb(0, 255, 0)? (a) magenta (b) bright green (c) white (d) red
9. 9.🌈 Which colour is #ffff00? (a) blue (b) yellow (c) white (d) magenta
10. 10.🌈 In #410000 the red part is the hex number 41. What is it as a normal number?
11. 11.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) red (c) black (d) green
12. 12.🌈 In #300000 the red part is the hex number 30. What is it as a normal number?
13. 13.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) G (c) Z (d) J
14. 14.🌈 Which colour of light is strongest in rgb(27, 137, 235)? (a) green (b) red (c) blue
15. 15.🌈 Which colour of light is strongest in rgb(213, 42, 87)? (a) green (b) red (c) blue
16. 16.🌈 Which colour is rgb(0, 0, 0)? (a) yellow (b) bright green (c) cyan (d) black
17. 17.🌈 Which colour is #ff0000? (a) red (b) white (c) bright green (d) black
18. 18.🌈 Which colour of light is strongest in rgb(223, 9, 129)? (a) red (b) blue (c) green
19. 19.🌈 In #0000ab the blue part is the hex number ab. What is it as a normal number?
20. 20.🌈 Which colour of light is strongest in rgb(76, 96, 173)? (a) red (b) green (c) blue
21. 21.🌈 Which colour is rgb(255, 0, 255)? (a) blue (b) magenta (c) cyan (d) bright green
22. 22.🌈 Which hex code is yellow? (a) #00ff00 (b) #0000ff (c) #ff0000 (d) #ffff00
23. 23.🌈 Which colour of light is strongest in rgb(19, 150, 135)? (a) blue (b) green (c) red
24. 24.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 255 (c) 99 (d) 1000
25. 25.🌈 Which hex code is red? (a) #ff0000 (b) #0000ff (c) #00ffff (d) #00ff00
26. 26.🌈 Which colour of light is strongest in rgb(188, 91, 114)? (a) blue (b) green (c) red
27. 27.🌈 Which colour is #ffffff? (a) white (b) red (c) yellow (d) cyan
28. 28.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) black (c) magenta (d) yellow
29. 29.🌈 Which colour is #00ffff? (a) cyan (b) red (c) magenta (d) black
30. 30.🌈 Which colour is #0000ff? (a) black (b) blue (c) red (d) magenta
31. 31.🌈 Which colour of light is strongest in rgb(174, 121, 103)? (a) blue (b) red (c) green
32. 32.🌈 Which hex code is white? (a) #ffffff (b) #ff0000 (c) #ff00ff (d) #00ffff
33. 33.🌈 Which colour is rgb(255, 0, 0)? (a) magenta (b) black (c) blue (d) red
34. 34.🌈 Which colour of light is strongest in rgb(74, 113, 174)? (a) blue (b) green (c) red
35. 35.🌈 In #0000e7 the blue part is the hex number e7. What is it as a normal number?
36. 36.🌈 Which hex code is black? (a) #00ff00 (b) #00ffff (c) #000000 (d) #ff00ff
37. 37.🌈 Which hex code is blue? (a) #00ff00 (b) #00ffff (c) #0000ff (d) #ff0000
38. 38.🌈 In #000007 the blue part is the hex number 07. What is it as a normal number?
39. 39.🌈 Which colour of light is strongest in rgb(31, 58, 158)? (a) blue (b) green (c) red
40. 40.🌈 In #00cb00 the green part is the hex number cb. What is it as a normal number?

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