CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 182 · 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.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 2 (c) 3 (d) 6
2. 2.🌈 In #c00000 the red part is the hex number c0. What is it as a normal number?
3. 3.🌈 Which colour is #ff00ff? (a) bright green (b) red (c) black (d) magenta
4. 4.🌈 Which colour is #ffff00? (a) black (b) magenta (c) yellow (d) bright green
5. 5.🌈 Which hex code is black? (a) #0000ff (b) #ffffff (c) #00ff00 (d) #000000
6. 6.🌈 In #000033 the blue part is the hex number 33. What is it as a normal number?
7. 7.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) F (c) J (d) G
8. 8.🌈 Which colour is #00ff00? (a) bright green (b) yellow (c) red (d) white
9. 9.🌈 Which colour of light is strongest in rgb(222, 89, 8)? (a) green (b) red (c) blue
10. 10.🌈 Which colour of light is strongest in rgb(70, 35, 156)? (a) green (b) red (c) blue
11. 11.🌈 Which colour is #00ffff? (a) cyan (b) black (c) yellow (d) bright green
12. 12.🌈 Which hex code is red? (a) #00ffff (b) #ffff00 (c) #000000 (d) #ff0000
13. 13.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) green (c) red (d) blue
14. 14.🌈 Which hex code is white? (a) #0000ff (b) #00ffff (c) #00ff00 (d) #ffffff
15. 15.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) magenta (c) cyan (d) black
16. 16.🌈 Which hex code is cyan? (a) #00ff00 (b) #000000 (c) #00ffff (d) #ff0000
17. 17.🌈 Which colour is rgb(0, 255, 255)? (a) bright green (b) yellow (c) magenta (d) cyan
18. 18.🌈 Which colour is #ffffff? (a) red (b) cyan (c) white (d) bright green
19. 19.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) magenta (c) blue (d) bright green
20. 20.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) white (c) black (d) red
21. 21.🌈 Which hex code is blue? (a) #ff00ff (b) #00ffff (c) #00ff00 (d) #0000ff
22. 22.🌈 In #840000 the red part is the hex number 84. What is it as a normal number?
23. 23.🌈 Which colour of light is strongest in rgb(122, 216, 58)? (a) blue (b) green (c) red
24. 24.🌈 Which hex code is yellow? (a) #00ff00 (b) #000000 (c) #ffff00 (d) #00ffff
25. 25.🌈 Which colour of light is strongest in rgb(198, 39, 104)? (a) green (b) blue (c) red
26. 26.🌈 In #003000 the green part is the hex number 30. What is it as a normal number?
27. 27.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) blue (c) red (d) green
28. 28.🌈 Which colour is #0000ff? (a) blue (b) yellow (c) red (d) magenta
29. 29.🌈 In #00002e the blue part is the hex number 2e. What is it as a normal number?
30. 30.🌈 Which colour is #ff0000? (a) blue (b) red (c) black (d) magenta
31. 31.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 99 (c) 100 (d) 1000
32. 32.🌈 Which colour is rgb(255, 255, 255)? (a) black (b) red (c) white (d) magenta
33. 33.🌈 In #000082 the blue part is the hex number 82. What is it as a normal number?
34. 34.🌈 In #004e00 the green part is the hex number 4e. What is it as a normal number?
35. 35.🌈 Which colour of light is strongest in rgb(125, 96, 182)? (a) green (b) red (c) blue
36. 36.🌈 Which colour is #000000? (a) bright green (b) cyan (c) blue (d) black
37. 37.🌈 Which hex code is bright green? (a) #00ff00 (b) #0000ff (c) #ff0000 (d) #ffff00
38. 38.🌈 Which colour is rgb(255, 0, 255)? (a) red (b) white (c) magenta (d) yellow
39. 39.🌈 Which colour of light is strongest in rgb(173, 25, 5)? (a) green (b) red (c) blue
40. 40.🌈 Which colour of light is strongest in rgb(127, 14, 235)? (a) green (b) red (c) blue

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