CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 35 · 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.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 99 (c) 1000 (d) 255
2. 2.🌈 Which colour is rgb(255, 0, 0)? (a) yellow (b) black (c) white (d) red
3. 3.🌈 Which colour of light is strongest in rgb(87, 151, 107)? (a) blue (b) green (c) red
4. 4.🌈 Which colour of light is strongest in rgb(193, 14, 84)? (a) red (b) blue (c) green
5. 5.🌈 Which colour is #00ffff? (a) blue (b) magenta (c) cyan (d) red
6. 6.🌈 In #8e0000 the red part is the hex number 8e. What is it as a normal number?
7. 7.🌈 In #008000 the green part is the hex number 80. What is it as a normal number?
8. 8.🌈 Which colour is #000000? (a) black (b) magenta (c) white (d) yellow
9. 9.🌈 Which colour of light is strongest in rgb(82, 181, 66)? (a) red (b) blue (c) green
10. 10.🌈 Which colour is rgb(255, 255, 0)? (a) bright green (b) black (c) cyan (d) yellow
11. 11.🌈 Hex digits go 0 to 9, then A to which letter? (a) J (b) G (c) Z (d) F
12. 12.🌈 Which hex code is magenta? (a) #000000 (b) #00ff00 (c) #ff00ff (d) #00ffff
13. 13.🌈 Which colour is #ff0000? (a) white (b) yellow (c) bright green (d) red
14. 14.🌈 Which colour of light is strongest in rgb(86, 188, 62)? (a) green (b) blue (c) red
15. 15.🌈 In #0000a1 the blue part is the hex number a1. What is it as a normal number?
16. 16.🌈 Which colour is rgb(0, 0, 255)? (a) red (b) yellow (c) blue (d) magenta
17. 17.🌈 Which colour is rgb(255, 255, 255)? (a) white (b) red (c) cyan (d) yellow
18. 18.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) green (c) blue (d) black
19. 19.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) yellow (c) white (d) magenta
20. 20.🌈 Which hex code is bright green? (a) #ff00ff (b) #ff0000 (c) #00ff00 (d) #ffffff
21. 21.🌈 In #00002a the blue part is the hex number 2a. What is it as a normal number?
22. 22.🌈 Which colour of light is strongest in rgb(14, 189, 34)? (a) blue (b) red (c) green
23. 23.🌈 Which hex code is cyan? (a) #ff00ff (b) #00ffff (c) #ff0000 (d) #0000ff
24. 24.🌈 Which colour of light is strongest in rgb(99, 213, 96)? (a) red (b) blue (c) green
25. 25.🌈 Which hex code is yellow? (a) #ff0000 (b) #ffffff (c) #000000 (d) #ffff00
26. 26.🌈 Which colour is #ff00ff? (a) blue (b) white (c) magenta (d) yellow
27. 27.🌈 In #230000 the red part is the hex number 23. What is it as a normal number?
28. 28.🌈 In #00cd00 the green part is the hex number cd. What is it as a normal number?
29. 29.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 2 (c) 4 (d) 3
30. 30.🌈 Which hex code is red? (a) #0000ff (b) #ff00ff (c) #ff0000 (d) #00ffff
31. 31.🌈 In #330000 the red part is the hex number 33. What is it as a normal number?
32. 32.🌈 Which colour of light is strongest in rgb(140, 246, 30)? (a) red (b) green (c) blue
33. 33.🌈 In #0000fb the blue part is the hex number fb. What is it as a normal number?
34. 34.🌈 Which colour is rgb(0, 0, 0)? (a) blue (b) black (c) yellow (d) bright green
35. 35.🌈 Which colour of light is strongest in rgb(22, 181, 139)? (a) green (b) blue (c) red
36. 36.🌈 In #f60000 the red part is the hex number f6. What is it as a normal number?
37. 37.🌈 Which colour is #ffffff? (a) yellow (b) magenta (c) white (d) red
38. 38.🌈 In #00f600 the green part is the hex number f6. What is it as a normal number?
39. 39.🌈 In #240000 the red part is the hex number 24. What is it as a normal number?
40. 40.🌈 Which hex code is black? (a) #0000ff (b) #000000 (c) #ff0000 (d) #ffff00

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