CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 293 · 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) cyan (b) bright green (c) yellow (d) blue
2. 2.🌈 Which colour is #ffffff? (a) white (b) red (c) blue (d) bright green
3. 3.🌈 Which colour of light is strongest in rgb(226, 89, 78)? (a) green (b) red (c) blue
4. 4.🌈 Which colour is #00ffff? (a) bright green (b) cyan (c) yellow (d) magenta
5. 5.🌈 Which colour of light is strongest in rgb(129, 74, 214)? (a) red (b) blue (c) green
6. 6.🌈 Which colour is #000000? (a) yellow (b) red (c) black (d) blue
7. 7.🌈 Which hex code is blue? (a) #ffffff (b) #000000 (c) #ffff00 (d) #0000ff
8. 8.🌈 Which colour of light is strongest in rgb(114, 225, 53)? (a) red (b) green (c) blue
9. 9.🌈 In #bb0000 the red part is the hex number bb. What is it as a normal number?
10. 10.🌈 Which colour of light is strongest in rgb(189, 23, 72)? (a) green (b) blue (c) red
11. 11.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) black (c) magenta (d) red
12. 12.🌈 Which colour of light is strongest in rgb(100, 73, 196)? (a) red (b) blue (c) green
13. 13.🌈 Which colour of light is strongest in rgb(60, 221, 100)? (a) blue (b) red (c) green
14. 14.🌈 Which hex code is cyan? (a) #ff0000 (b) #00ff00 (c) #0000ff (d) #00ffff
15. 15.🌈 In #rrggbb, which colour do the first two digits give? (a) green (b) black (c) blue (d) red
16. 16.🌈 Which colour is rgb(255, 0, 255)? (a) white (b) red (c) magenta (d) cyan
17. 17.🌈 Which colour is #0000ff? (a) cyan (b) magenta (c) blue (d) black
18. 18.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) G (c) J (d) F
19. 19.🌈 Which colour of light is strongest in rgb(113, 65, 178)? (a) blue (b) red (c) green
20. 20.🌈 Which hex code is white? (a) #00ffff (b) #000000 (c) #ffffff (d) #0000ff
21. 21.🌈 Which hex code is bright green? (a) #ff0000 (b) #000000 (c) #00ff00 (d) #ffffff
22. 22.🌈 Which colour is rgb(255, 255, 255)? (a) yellow (b) cyan (c) black (d) white
23. 23.🌈 What is the biggest number one colour can have in rgb()? (a) 1000 (b) 255 (c) 100 (d) 99
24. 24.🌈 In #00005a the blue part is the hex number 5a. What is it as a normal number?
25. 25.🌈 Which colour of light is strongest in rgb(29, 153, 33)? (a) red (b) blue (c) green
26. 26.🌈 In #00004d the blue part is the hex number 4d. What is it as a normal number?
27. 27.🌈 Which colour is rgb(0, 0, 255)? (a) cyan (b) blue (c) white (d) black
28. 28.🌈 Which colour is rgb(0, 0, 0)? (a) magenta (b) red (c) black (d) white
29. 29.🌈 Which hex code is magenta? (a) #ff00ff (b) #00ff00 (c) #ffffff (d) #ff0000
30. 30.🌈 Which colour is #ffff00? (a) cyan (b) magenta (c) red (d) yellow
31. 31.🌈 In #007800 the green part is the hex number 78. What is it as a normal number?
32. 32.🌈 In #a20000 the red part is the hex number a2. What is it as a normal number?
33. 33.🌈 Which colour of light is strongest in rgb(56, 175, 31)? (a) red (b) green (c) blue
34. 34.🌈 Which colour is rgb(255, 255, 0)? (a) cyan (b) yellow (c) blue (d) red
35. 35.🌈 Which colour is rgb(255, 0, 0)? (a) bright green (b) cyan (c) yellow (d) red
36. 36.🌈 Which colour is #ff00ff? (a) yellow (b) white (c) bright green (d) magenta
37. 37.🌈 In #000011 the blue part is the hex number 11. What is it as a normal number?
38. 38.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 6 (c) 3 (d) 4
39. 39.🌈 In #830000 the red part is the hex number 83. What is it as a normal number?
40. 40.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) green (c) blue (d) red

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