CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 256 · 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) #ff0000 (c) #ff00ff (d) #000000
2. 2.🌈 In #009500 the green part is the hex number 95. What is it as a normal number?
3. 3.🌈 In #009d00 the green part is the hex number 9d. What is it as a normal number?
4. 4.🌈 In #0000d9 the blue part is the hex number d9. What is it as a normal number?
5. 5.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) green (c) black (d) red
6. 6.🌈 Which colour is #0000ff? (a) red (b) blue (c) yellow (d) bright green
7. 7.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) F (c) J (d) G
8. 8.🌈 In #f30000 the red part is the hex number f3. What is it as a normal number?
9. 9.🌈 Which colour is rgb(0, 255, 0)? (a) blue (b) yellow (c) black (d) bright green
10. 10.🌈 Which hex code is cyan? (a) #000000 (b) #ff00ff (c) #0000ff (d) #00ffff
11. 11.🌈 Which colour of light is strongest in rgb(168, 55, 60)? (a) red (b) green (c) blue
12. 12.🌈 Which hex code is white? (a) #ffffff (b) #0000ff (c) #000000 (d) #00ff00
13. 13.🌈 Which colour is rgb(255, 255, 255)? (a) magenta (b) white (c) cyan (d) red
14. 14.🌈 Which colour is #00ffff? (a) blue (b) cyan (c) red (d) black
15. 15.🌈 Which colour is #ff00ff? (a) blue (b) magenta (c) red (d) black
16. 16.🌈 In #a80000 the red part is the hex number a8. What is it as a normal number?
17. 17.🌈 Which colour of light is strongest in rgb(96, 139, 176)? (a) red (b) blue (c) green
18. 18.🌈 Which hex code is magenta? (a) #00ff00 (b) #0000ff (c) #ff00ff (d) #00ffff
19. 19.🌈 Which colour of light is strongest in rgb(16, 84, 186)? (a) red (b) green (c) blue
20. 20.🌈 Which colour of light is strongest in rgb(129, 178, 75)? (a) green (b) blue (c) red
21. 21.🌈 Which colour of light is strongest in rgb(82, 74, 223)? (a) green (b) blue (c) red
22. 22.🌈 Which colour is #ff0000? (a) red (b) blue (c) yellow (d) white
23. 23.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) green (c) white (d) red
24. 24.🌈 Which colour is rgb(255, 0, 255)? (a) magenta (b) red (c) cyan (d) bright green
25. 25.🌈 Which colour of light is strongest in rgb(91, 121, 251)? (a) red (b) blue (c) green
26. 26.🌈 In #290000 the red part is the hex number 29. What is it as a normal number?
27. 27.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 3 (c) 6 (d) 4
28. 28.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) white (c) red (d) bright green
29. 29.🌈 Which hex code is yellow? (a) #ff0000 (b) #0000ff (c) #ffff00 (d) #ff00ff
30. 30.🌈 Which colour is #ffff00? (a) black (b) blue (c) yellow (d) white
31. 31.🌈 Which colour of light is strongest in rgb(251, 52, 63)? (a) blue (b) red (c) green
32. 32.🌈 Which colour is #000000? (a) black (b) magenta (c) yellow (d) white
33. 33.🌈 Which colour of light is strongest in rgb(213, 97, 98)? (a) green (b) red (c) blue
34. 34.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 99 (c) 1000 (d) 100
35. 35.🌈 Which colour of light is strongest in rgb(74, 127, 159)? (a) green (b) red (c) blue
36. 36.🌈 Which colour of light is strongest in rgb(182, 43, 31)? (a) green (b) red (c) blue
37. 37.🌈 Which colour of light is strongest in rgb(229, 115, 16)? (a) green (b) blue (c) red
38. 38.🌈 In #e20000 the red part is the hex number e2. What is it as a normal number?
39. 39.🌈 Which colour is #00ff00? (a) black (b) magenta (c) bright green (d) white
40. 40.🌈 In #00f700 the green part is the hex number f7. What is it as a normal number?

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