CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 267 · 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.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) Z (c) G (d) F
2. 2.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 6 (c) 3 (d) 4
3. 3.🌈 Which hex code is magenta? (a) #ffffff (b) #ffff00 (c) #ff00ff (d) #ff0000
4. 4.🌈 Which colour of light is strongest in rgb(246, 27, 129)? (a) red (b) green (c) blue
5. 5.🌈 In #0000ca the blue part is the hex number ca. What is it as a normal number?
6. 6.🌈 Which colour is #ff00ff? (a) blue (b) red (c) magenta (d) black
7. 7.🌈 Which colour is rgb(255, 255, 255)? (a) blue (b) magenta (c) yellow (d) white
8. 8.🌈 Which colour of light is strongest in rgb(53, 54, 203)? (a) red (b) blue (c) green
9. 9.🌈 Which colour is rgb(0, 255, 0)? (a) white (b) red (c) bright green (d) magenta
10. 10.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) green (c) black (d) blue
11. 11.🌈 In #000900 the green part is the hex number 09. What is it as a normal number?
12. 12.🌈 Which colour is rgb(255, 0, 0)? (a) yellow (b) red (c) white (d) bright green
13. 13.🌈 Which colour is #00ff00? (a) bright green (b) yellow (c) red (d) magenta
14. 14.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) blue (c) red (d) white
15. 15.🌈 Which colour of light is strongest in rgb(229, 4, 11)? (a) green (b) blue (c) red
16. 16.🌈 Which colour is rgb(0, 0, 255)? (a) cyan (b) bright green (c) blue (d) yellow
17. 17.🌈 In #007600 the green part is the hex number 76. What is it as a normal number?
18. 18.🌈 Which colour is #ffff00? (a) yellow (b) magenta (c) black (d) cyan
19. 19.🌈 Which colour of light is strongest in rgb(31, 153, 12)? (a) blue (b) red (c) green
20. 20.🌈 Which colour of light is strongest in rgb(158, 85, 49)? (a) green (b) red (c) blue
21. 21.🌈 Which colour of light is strongest in rgb(201, 24, 19)? (a) red (b) green (c) blue
22. 22.🌈 Which colour is #ff0000? (a) red (b) white (c) blue (d) black
23. 23.🌈 Which colour is #0000ff? (a) cyan (b) red (c) magenta (d) blue
24. 24.🌈 Which colour of light is strongest in rgb(55, 63, 175)? (a) blue (b) green (c) red
25. 25.🌈 In #6c0000 the red part is the hex number 6c. What is it as a normal number?
26. 26.🌈 Which colour is #ffffff? (a) red (b) white (c) black (d) yellow
27. 27.🌈 Which colour of light is strongest in rgb(45, 124, 229)? (a) blue (b) red (c) green
28. 28.🌈 Which colour of light is strongest in rgb(100, 125, 252)? (a) blue (b) green (c) red
29. 29.🌈 Which hex code is bright green? (a) #ffff00 (b) #00ffff (c) #00ff00 (d) #000000
30. 30.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 100 (c) 255 (d) 1000
31. 31.🌈 Which hex code is yellow? (a) #ff00ff (b) #ffff00 (c) #00ffff (d) #00ff00
32. 32.🌈 Which colour of light is strongest in rgb(87, 28, 184)? (a) red (b) blue (c) green
33. 33.🌈 Which colour is rgb(0, 255, 255)? (a) cyan (b) bright green (c) black (d) white
34. 34.🌈 Which colour is #000000? (a) black (b) yellow (c) white (d) red
35. 35.🌈 Which colour of light is strongest in rgb(219, 87, 130)? (a) green (b) blue (c) red
36. 36.🌈 Which hex code is white? (a) #00ff00 (b) #ffffff (c) #0000ff (d) #ffff00
37. 37.🌈 Which hex code is red? (a) #00ffff (b) #00ff00 (c) #ff0000 (d) #000000
38. 38.🌈 In #000036 the blue part is the hex number 36. What is it as a normal number?
39. 39.🌈 Which colour is rgb(0, 0, 0)? (a) magenta (b) cyan (c) black (d) bright green
40. 40.🌈 Which colour of light is strongest in rgb(18, 60, 194)? (a) green (b) red (c) blue

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