CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 115 · 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 yellow? (a) #00ffff (b) #ffff00 (c) #ffffff (d) #0000ff
2. 2.🌈 Which hex code is black? (a) #ffff00 (b) #000000 (c) #00ffff (d) #ff00ff
3. 3.🌈 In #040000 the red part is the hex number 04. What is it as a normal number?
4. 4.🌈 Which colour of light is strongest in rgb(120, 172, 51)? (a) blue (b) red (c) green
5. 5.🌈 Which hex code is cyan? (a) #00ffff (b) #ff0000 (c) #ffffff (d) #0000ff
6. 6.🌈 Which colour of light is strongest in rgb(27, 172, 28)? (a) green (b) red (c) blue
7. 7.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) J (c) G (d) F
8. 8.🌈 In #005800 the green part is the hex number 58. What is it as a normal number?
9. 9.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) yellow (c) white (d) cyan
10. 10.🌈 Which colour of light is strongest in rgb(182, 125, 88)? (a) blue (b) red (c) green
11. 11.🌈 Which colour is #ff00ff? (a) magenta (b) bright green (c) yellow (d) black
12. 12.🌈 Which colour of light is strongest in rgb(89, 159, 33)? (a) red (b) blue (c) green
13. 13.🌈 Which colour is rgb(255, 0, 0)? (a) bright green (b) white (c) red (d) magenta
14. 14.🌈 Which colour of light is strongest in rgb(240, 21, 51)? (a) red (b) blue (c) green
15. 15.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) white (c) blue (d) red
16. 16.🌈 Which colour of light is strongest in rgb(26, 13, 208)? (a) green (b) blue (c) red
17. 17.🌈 Which colour of light is strongest in rgb(14, 132, 179)? (a) green (b) blue (c) red
18. 18.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 3 (b) 4 (c) 2 (d) 6
19. 19.🌈 Which colour is rgb(255, 255, 255)? (a) white (b) black (c) bright green (d) red
20. 20.🌈 Which colour is #00ffff? (a) white (b) yellow (c) cyan (d) black
21. 21.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) green (c) black (d) blue
22. 22.🌈 Which colour is #000000? (a) black (b) white (c) magenta (d) yellow
23. 23.🌈 Which colour is #ff0000? (a) cyan (b) magenta (c) blue (d) red
24. 24.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 100 (c) 99 (d) 1000
25. 25.🌈 In #00007f the blue part is the hex number 7f. What is it as a normal number?
26. 26.🌈 Which colour is #ffff00? (a) red (b) black (c) blue (d) yellow
27. 27.🌈 Which colour is rgb(0, 0, 255)? (a) black (b) blue (c) yellow (d) cyan
28. 28.🌈 Which colour is rgb(255, 255, 0)? (a) cyan (b) yellow (c) black (d) red
29. 29.🌈 Which hex code is white? (a) #ffffff (b) #0000ff (c) #ff0000 (d) #00ffff
30. 30.🌈 Which colour is rgb(255, 0, 255)? (a) blue (b) white (c) magenta (d) cyan
31. 31.🌈 Which colour is #00ff00? (a) bright green (b) yellow (c) black (d) red
32. 32.🌈 In #280000 the red part is the hex number 28. What is it as a normal number?
33. 33.🌈 Which colour of light is strongest in rgb(24, 235, 134)? (a) red (b) blue (c) green
34. 34.🌈 Which colour is rgb(0, 255, 255)? (a) bright green (b) cyan (c) black (d) white
35. 35.🌈 In #9f0000 the red part is the hex number 9f. What is it as a normal number?
36. 36.🌈 Which colour of light is strongest in rgb(5, 190, 91)? (a) blue (b) green (c) red
37. 37.🌈 In #540000 the red part is the hex number 54. What is it as a normal number?
38. 38.🌈 Which colour of light is strongest in rgb(115, 111, 192)? (a) green (b) red (c) blue
39. 39.🌈 In #100000 the red part is the hex number 10. What is it as a normal number?
40. 40.🌈 Which colour of light is strongest in rgb(71, 214, 114)? (a) red (b) blue (c) green

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