CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 82 · 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(0, 0, 0)? (a) blue (b) black (c) magenta (d) yellow
2. 2.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) red (c) green (d) white
3. 3.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) cyan (c) black (d) magenta
4. 4.🌈 Which hex code is magenta? (a) #00ffff (b) #ff00ff (c) #00ff00 (d) #ff0000
5. 5.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 1000 (c) 99 (d) 255
6. 6.🌈 In #008500 the green part is the hex number 85. What is it as a normal number?
7. 7.🌈 Which colour is rgb(0, 255, 0)? (a) yellow (b) cyan (c) red (d) bright green
8. 8.🌈 Which colour is #ff00ff? (a) cyan (b) magenta (c) bright green (d) white
9. 9.🌈 Which colour is #ff0000? (a) magenta (b) bright green (c) red (d) yellow
10. 10.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) black (c) blue (d) green
11. 11.🌈 Which hex code is bright green? (a) #0000ff (b) #00ff00 (c) #00ffff (d) #ffff00
12. 12.🌈 Which colour is #00ffff? (a) black (b) blue (c) cyan (d) bright green
13. 13.🌈 Which colour of light is strongest in rgb(233, 107, 17)? (a) blue (b) red (c) green
14. 14.🌈 In #004c00 the green part is the hex number 4c. What is it as a normal number?
15. 15.🌈 In #000039 the blue part is the hex number 39. What is it as a normal number?
16. 16.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 3 (b) 4 (c) 6 (d) 2
17. 17.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) F (c) G (d) Z
18. 18.🌈 In #009600 the green part is the hex number 96. What is it as a normal number?
19. 19.🌈 In #db0000 the red part is the hex number db. What is it as a normal number?
20. 20.🌈 Which hex code is yellow? (a) #000000 (b) #ffffff (c) #ff0000 (d) #ffff00
21. 21.🌈 Which hex code is cyan? (a) #00ff00 (b) #00ffff (c) #ff0000 (d) #000000
22. 22.🌈 In #008000 the green part is the hex number 80. What is it as a normal number?
23. 23.🌈 Which hex code is black? (a) #0000ff (b) #ff0000 (c) #ffffff (d) #000000
24. 24.🌈 In #0c0000 the red part is the hex number 0c. What is it as a normal number?
25. 25.🌈 Which colour is rgb(0, 255, 255)? (a) black (b) white (c) red (d) cyan
26. 26.🌈 Which colour of light is strongest in rgb(31, 197, 61)? (a) green (b) red (c) blue
27. 27.🌈 In #300000 the red part is the hex number 30. What is it as a normal number?
28. 28.🌈 Which colour is #000000? (a) red (b) magenta (c) white (d) black
29. 29.🌈 Which colour of light is strongest in rgb(2, 178, 86)? (a) red (b) blue (c) green
30. 30.🌈 In #003800 the green part is the hex number 38. What is it as a normal number?
31. 31.🌈 Which colour is rgb(255, 0, 255)? (a) bright green (b) yellow (c) magenta (d) red
32. 32.🌈 Which colour of light is strongest in rgb(244, 4, 96)? (a) green (b) red (c) blue
33. 33.🌈 Which colour of light is strongest in rgb(159, 67, 102)? (a) green (b) blue (c) red
34. 34.🌈 Which colour of light is strongest in rgb(76, 40, 244)? (a) red (b) green (c) blue
35. 35.🌈 Which colour of light is strongest in rgb(96, 152, 64)? (a) red (b) blue (c) green
36. 36.🌈 In #002600 the green part is the hex number 26. What is it as a normal number?
37. 37.🌈 Which colour is rgb(255, 0, 0)? (a) red (b) black (c) blue (d) yellow
38. 38.🌈 Which colour is rgb(255, 255, 255)? (a) white (b) blue (c) black (d) bright green
39. 39.🌈 Which colour is #00ff00? (a) bright green (b) cyan (c) magenta (d) yellow
40. 40.🌈 Which hex code is white? (a) #ff00ff (b) #ffffff (c) #00ffff (d) #00ff00

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