CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 350 · 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, 255)? (a) black (b) magenta (c) red (d) blue
2. 2.🌈 Which colour is rgb(0, 255, 0)? (a) black (b) magenta (c) bright green (d) white
3. 3.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) G (c) J (d) F
4. 4.🌈 Which hex code is bright green? (a) #ffffff (b) #000000 (c) #00ffff (d) #00ff00
5. 5.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) green (c) white (d) red
6. 6.🌈 Which colour is #ff0000? (a) bright green (b) yellow (c) red (d) black
7. 7.🌈 Which hex code is red? (a) #0000ff (b) #ff0000 (c) #000000 (d) #ffffff
8. 8.🌈 Which colour of light is strongest in rgb(20, 69, 160)? (a) green (b) blue (c) red
9. 9.🌈 In #001a00 the green part is the hex number 1a. What is it as a normal number?
10. 10.🌈 Which colour is rgb(255, 0, 255)? (a) red (b) magenta (c) yellow (d) cyan
11. 11.🌈 Which colour is #00ff00? (a) red (b) bright green (c) blue (d) white
12. 12.🌈 Which colour is #ffffff? (a) black (b) yellow (c) white (d) cyan
13. 13.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 3 (c) 6 (d) 4
14. 14.🌈 In #470000 the red part is the hex number 47. What is it as a normal number?
15. 15.🌈 Which hex code is cyan? (a) #000000 (b) #00ffff (c) #0000ff (d) #ffff00
16. 16.🌈 In #020000 the red part is the hex number 02. What is it as a normal number?
17. 17.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 100 (c) 99 (d) 1000
18. 18.🌈 Which colour of light is strongest in rgb(41, 22, 236)? (a) red (b) green (c) blue
19. 19.🌈 Which hex code is white? (a) #ffff00 (b) #0000ff (c) #ffffff (d) #000000
20. 20.🌈 Which colour is #000000? (a) black (b) white (c) yellow (d) magenta
21. 21.🌈 Which hex code is yellow? (a) #ff0000 (b) #ffffff (c) #ffff00 (d) #ff00ff
22. 22.🌈 In #d10000 the red part is the hex number d1. What is it as a normal number?
23. 23.🌈 In #008000 the green part is the hex number 80. What is it as a normal number?
24. 24.🌈 Which colour of light is strongest in rgb(180, 38, 109)? (a) green (b) blue (c) red
25. 25.🌈 In #7c0000 the red part is the hex number 7c. What is it as a normal number?
26. 26.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) red (c) green (d) black
27. 27.🌈 Which colour of light is strongest in rgb(195, 84, 86)? (a) blue (b) red (c) green
28. 28.🌈 In #410000 the red part is the hex number 41. What is it as a normal number?
29. 29.🌈 Which colour of light is strongest in rgb(251, 24, 65)? (a) green (b) red (c) blue
30. 30.🌈 In #b10000 the red part is the hex number b1. What is it as a normal number?
31. 31.🌈 Which colour of light is strongest in rgb(105, 51, 154)? (a) green (b) red (c) blue
32. 32.🌈 Which colour is #0000ff? (a) white (b) blue (c) bright green (d) red
33. 33.🌈 Which colour is rgb(0, 0, 0)? (a) red (b) black (c) cyan (d) white
34. 34.🌈 Which colour is #ff00ff? (a) bright green (b) magenta (c) white (d) yellow
35. 35.🌈 Which colour of light is strongest in rgb(138, 208, 124)? (a) blue (b) red (c) green
36. 36.🌈 Which colour is rgb(255, 255, 0)? (a) white (b) yellow (c) bright green (d) blue
37. 37.🌈 Which hex code is blue? (a) #ff0000 (b) #ffff00 (c) #00ff00 (d) #0000ff
38. 38.🌈 In #008500 the green part is the hex number 85. What is it as a normal number?
39. 39.🌈 In #008600 the green part is the hex number 86. What is it as a normal number?
40. 40.🌈 Which colour of light is strongest in rgb(169, 102, 37)? (a) green (b) red (c) blue

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