CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 210 · 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 #00ff00? (a) magenta (b) bright green (c) red (d) white
2. 2.🌈 Which colour is rgb(0, 0, 255)? (a) yellow (b) blue (c) red (d) white
3. 3.🌈 Which colour is rgb(255, 255, 255)? (a) magenta (b) bright green (c) white (d) black
4. 4.🌈 Which colour of light is strongest in rgb(229, 16, 105)? (a) blue (b) green (c) red
5. 5.🌈 Which colour is #ff0000? (a) blue (b) red (c) black (d) white
6. 6.🌈 Which colour is rgb(0, 255, 0)? (a) blue (b) cyan (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.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 3 (b) 6 (c) 4 (d) 2
9. 9.🌈 Which colour is rgb(255, 0, 0)? (a) black (b) red (c) bright green (d) blue
10. 10.🌈 In #001b00 the green part is the hex number 1b. What is it as a normal number?
11. 11.🌈 Which colour of light is strongest in rgb(174, 123, 82)? (a) red (b) blue (c) green
12. 12.🌈 Which colour is #ffffff? (a) blue (b) black (c) white (d) cyan
13. 13.🌈 Which colour of light is strongest in rgb(10, 154, 3)? (a) red (b) green (c) blue
14. 14.🌈 Which colour is #000000? (a) white (b) cyan (c) black (d) yellow
15. 15.🌈 Which colour of light is strongest in rgb(73, 198, 112)? (a) red (b) green (c) blue
16. 16.🌈 Which hex code is black? (a) #ffffff (b) #000000 (c) #ff0000 (d) #00ff00
17. 17.🌈 In #370000 the red part is the hex number 37. What is it as a normal number?
18. 18.🌈 Which hex code is white? (a) #0000ff (b) #ffffff (c) #ff0000 (d) #000000
19. 19.🌈 In #00e800 the green part is the hex number e8. What is it as a normal number?
20. 20.🌈 Which colour of light is strongest in rgb(237, 116, 53)? (a) green (b) red (c) blue
21. 21.🌈 Which colour of light is strongest in rgb(250, 7, 37)? (a) red (b) blue (c) green
22. 22.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 100 (c) 255 (d) 1000
23. 23.🌈 In #f70000 the red part is the hex number f7. What is it as a normal number?
24. 24.🌈 Which colour is #0000ff? (a) cyan (b) blue (c) black (d) red
25. 25.🌈 Which colour is rgb(0, 0, 0)? (a) cyan (b) black (c) red (d) magenta
26. 26.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) green (c) red (d) white
27. 27.🌈 In #000087 the blue part is the hex number 87. What is it as a normal number?
28. 28.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) green (c) red (d) black
29. 29.🌈 Which colour is rgb(255, 0, 255)? (a) red (b) white (c) bright green (d) magenta
30. 30.🌈 Which colour is rgb(0, 255, 255)? (a) blue (b) bright green (c) white (d) cyan
31. 31.🌈 Which hex code is cyan? (a) #00ff00 (b) #ffffff (c) #00ffff (d) #ff00ff
32. 32.🌈 Which colour is #00ffff? (a) cyan (b) bright green (c) blue (d) black
33. 33.🌈 In #001200 the green part is the hex number 12. What is it as a normal number?
34. 34.🌈 In #001000 the green part is the hex number 10. What is it as a normal number?
35. 35.🌈 Which hex code is blue? (a) #0000ff (b) #000000 (c) #ff0000 (d) #00ff00
36. 36.🌈 In #000040 the blue part is the hex number 40. What is it as a normal number?
37. 37.🌈 In #004b00 the green part is the hex number 4b. What is it as a normal number?
38. 38.🌈 Which colour is #ffff00? (a) cyan (b) blue (c) red (d) yellow
39. 39.🌈 In #00c600 the green part is the hex number c6. What is it as a normal number?
40. 40.🌈 Which colour of light is strongest in rgb(43, 230, 9)? (a) green (b) red (c) blue

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