CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 258 · 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 colour is rgb(255, 255, 0)? (a) cyan (b) yellow (c) bright green (d) white
2. 2.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) F (c) Z (d) G
3. 3.🌈 In #e30000 the red part is the hex number e3. What is it as a normal number?
4. 4.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 4 (c) 6 (d) 3
5. 5.🌈 Which colour is #ffffff? (a) blue (b) white (c) red (d) cyan
6. 6.🌈 Which hex code is red? (a) #0000ff (b) #ffff00 (c) #ff00ff (d) #ff0000
7. 7.🌈 Which colour is #ffff00? (a) black (b) yellow (c) bright green (d) red
8. 8.🌈 Which colour is #0000ff? (a) blue (b) cyan (c) black (d) yellow
9. 9.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) green (c) red (d) blue
10. 10.🌈 In #001000 the green part is the hex number 10. What is it as a normal number?
11. 11.🌈 Which colour is rgb(255, 255, 255)? (a) blue (b) white (c) cyan (d) yellow
12. 12.🌈 Which colour is rgb(0, 255, 0)? (a) yellow (b) bright green (c) cyan (d) magenta
13. 13.🌈 In #190000 the red part is the hex number 19. What is it as a normal number?
14. 14.🌈 In #00002c the blue part is the hex number 2c. What is it as a normal number?
15. 15.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) blue (c) green (d) black
16. 16.🌈 Which colour is #ff0000? (a) cyan (b) blue (c) magenta (d) red
17. 17.🌈 Which hex code is yellow? (a) #ffffff (b) #0000ff (c) #00ffff (d) #ffff00
18. 18.🌈 Which colour is #00ffff? (a) magenta (b) blue (c) cyan (d) yellow
19. 19.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 1000 (c) 100 (d) 255
20. 20.🌈 In #000090 the blue part is the hex number 90. What is it as a normal number?
21. 21.🌈 Which colour is #000000? (a) black (b) cyan (c) yellow (d) red
22. 22.🌈 In #006500 the green part is the hex number 65. What is it as a normal number?
23. 23.🌈 Which colour is rgb(255, 0, 255)? (a) white (b) magenta (c) blue (d) bright green
24. 24.🌈 In #002a00 the green part is the hex number 2a. What is it as a normal number?
25. 25.🌈 Which hex code is white? (a) #00ff00 (b) #ffffff (c) #000000 (d) #ff0000
26. 26.🌈 Which hex code is cyan? (a) #ffff00 (b) #ff0000 (c) #0000ff (d) #00ffff
27. 27.🌈 Which colour is rgb(255, 0, 0)? (a) yellow (b) bright green (c) black (d) red
28. 28.🌈 Which colour is #00ff00? (a) red (b) magenta (c) bright green (d) black
29. 29.🌈 In #000032 the blue part is the hex number 32. What is it as a normal number?
30. 30.🌈 Which colour of light is strongest in rgb(98, 42, 252)? (a) green (b) red (c) blue
31. 31.🌈 In #2e0000 the red part is the hex number 2e. What is it as a normal number?
32. 32.🌈 In #000092 the blue part is the hex number 92. What is it as a normal number?
33. 33.🌈 In #0000db the blue part is the hex number db. What is it as a normal number?
34. 34.🌈 Which hex code is bright green? (a) #ff0000 (b) #00ffff (c) #ffff00 (d) #00ff00
35. 35.🌈 In #000034 the blue part is the hex number 34. What is it as a normal number?
36. 36.🌈 Which colour of light is strongest in rgb(112, 230, 86)? (a) red (b) blue (c) green
37. 37.🌈 In #008500 the green part is the hex number 85. What is it as a normal number?
38. 38.🌈 Which colour of light is strongest in rgb(80, 83, 254)? (a) red (b) green (c) blue
39. 39.🌈 In #c00000 the red part is the hex number c0. What is it as a normal number?
40. 40.🌈 Which colour of light is strongest in rgb(231, 29, 34)? (a) blue (b) green (c) red

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