CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 161 · 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 hex code is blue? (a) #00ff00 (b) #0000ff (c) #ffff00 (d) #ffffff
2. 2.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) J (c) F (d) G
3. 3.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 255 (c) 100 (d) 1000
4. 4.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) white (c) red (d) green
5. 5.🌈 Which colour of light is strongest in rgb(231, 111, 48)? (a) red (b) blue (c) green
6. 6.🌈 In #000054 the blue part is the hex number 54. What is it as a normal number?
7. 7.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 6 (c) 3 (d) 2
8. 8.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) blue (c) red (d) green
9. 9.🌈 Which hex code is magenta? (a) #ffffff (b) #ff00ff (c) #00ffff (d) #00ff00
10. 10.🌈 Which colour is #ff00ff? (a) yellow (b) black (c) magenta (d) blue
11. 11.🌈 Which hex code is red? (a) #ffffff (b) #00ffff (c) #ff0000 (d) #00ff00
12. 12.🌈 Which colour of light is strongest in rgb(239, 3, 138)? (a) blue (b) green (c) red
13. 13.🌈 In #5a0000 the red part is the hex number 5a. What is it as a normal number?
14. 14.🌈 Which colour is #00ff00? (a) yellow (b) blue (c) bright green (d) magenta
15. 15.🌈 Which colour is rgb(255, 255, 255)? (a) yellow (b) bright green (c) white (d) blue
16. 16.🌈 Which colour of light is strongest in rgb(7, 226, 139)? (a) green (b) red (c) blue
17. 17.🌈 In #0000f2 the blue part is the hex number f2. What is it as a normal number?
18. 18.🌈 Which colour of light is strongest in rgb(25, 226, 79)? (a) red (b) green (c) blue
19. 19.🌈 In #220000 the red part is the hex number 22. What is it as a normal number?
20. 20.🌈 In #00a300 the green part is the hex number a3. What is it as a normal number?
21. 21.🌈 Which colour of light is strongest in rgb(96, 33, 152)? (a) red (b) blue (c) green
22. 22.🌈 Which colour of light is strongest in rgb(103, 220, 19)? (a) blue (b) green (c) red
23. 23.🌈 Which colour of light is strongest in rgb(219, 68, 75)? (a) red (b) blue (c) green
24. 24.🌈 Which colour is rgb(255, 0, 255)? (a) yellow (b) red (c) cyan (d) magenta
25. 25.🌈 In #0d0000 the red part is the hex number 0d. What is it as a normal number?
26. 26.🌈 Which colour of light is strongest in rgb(23, 154, 87)? (a) blue (b) red (c) green
27. 27.🌈 Which colour is #000000? (a) blue (b) yellow (c) black (d) red
28. 28.🌈 Which colour is #00ffff? (a) magenta (b) bright green (c) cyan (d) yellow
29. 29.🌈 Which colour of light is strongest in rgb(57, 6, 202)? (a) red (b) blue (c) green
30. 30.🌈 Which hex code is cyan? (a) #ff0000 (b) #0000ff (c) #00ff00 (d) #00ffff
31. 31.🌈 Which hex code is white? (a) #00ffff (b) #ff0000 (c) #ffffff (d) #ff00ff
32. 32.🌈 Which colour is rgb(255, 255, 0)? (a) yellow (b) bright green (c) white (d) magenta
33. 33.🌈 Which colour is #ffffff? (a) blue (b) white (c) bright green (d) magenta
34. 34.🌈 In #3e0000 the red part is the hex number 3e. What is it as a normal number?
35. 35.🌈 Which colour is rgb(255, 0, 0)? (a) bright green (b) yellow (c) red (d) white
36. 36.🌈 Which hex code is black? (a) #ffffff (b) #000000 (c) #00ffff (d) #0000ff
37. 37.🌈 In #3c0000 the red part is the hex number 3c. What is it as a normal number?
38. 38.🌈 Which hex code is bright green? (a) #00ff00 (b) #ffffff (c) #ff0000 (d) #0000ff
39. 39.🌈 Which colour is rgb(0, 255, 0)? (a) white (b) magenta (c) black (d) bright green
40. 40.🌈 Which colour of light is strongest in rgb(99, 169, 18)? (a) red (b) blue (c) green

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