CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 355 · 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.🌈 In #rrggbb, which colour do the last two digits give? (a) green (b) blue (c) white (d) red
2. 2.🌈 In #003a00 the green part is the hex number 3a. What is it as a normal number?
3. 3.🌈 In #000036 the blue part is the hex number 36. What is it as a normal number?
4. 4.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) G (c) Z (d) J
5. 5.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) blue (c) red (d) green
6. 6.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 255 (c) 1000 (d) 100
7. 7.🌈 Which colour of light is strongest in rgb(34, 56, 231)? (a) red (b) blue (c) green
8. 8.🌈 Which colour is #000000? (a) white (b) black (c) magenta (d) yellow
9. 9.🌈 Which colour of light is strongest in rgb(213, 75, 84)? (a) red (b) green (c) blue
10. 10.🌈 Which colour is rgb(255, 255, 255)? (a) white (b) red (c) magenta (d) cyan
11. 11.🌈 Which colour is rgb(255, 0, 255)? (a) white (b) cyan (c) red (d) magenta
12. 12.🌈 Which colour is rgb(255, 0, 0)? (a) red (b) yellow (c) black (d) bright green
13. 13.🌈 Which hex code is bright green? (a) #ffff00 (b) #000000 (c) #ff0000 (d) #00ff00
14. 14.🌈 Which colour is rgb(0, 255, 255)? (a) black (b) yellow (c) cyan (d) white
15. 15.🌈 Which colour is #ffff00? (a) cyan (b) red (c) yellow (d) black
16. 16.🌈 In #00f200 the green part is the hex number f2. What is it as a normal number?
17. 17.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 4 (b) 6 (c) 2 (d) 3
18. 18.🌈 Which colour is rgb(0, 0, 255)? (a) magenta (b) bright green (c) blue (d) red
19. 19.🌈 In #003e00 the green part is the hex number 3e. What is it as a normal number?
20. 20.🌈 In #5e0000 the red part is the hex number 5e. What is it as a normal number?
21. 21.🌈 Which colour is #ff0000? (a) white (b) red (c) magenta (d) blue
22. 22.🌈 Which hex code is black? (a) #ffff00 (b) #ff0000 (c) #000000 (d) #ff00ff
23. 23.🌈 In #be0000 the red part is the hex number be. What is it as a normal number?
24. 24.🌈 Which colour is #00ffff? (a) cyan (b) black (c) red (d) blue
25. 25.🌈 Which colour is #0000ff? (a) blue (b) red (c) yellow (d) cyan
26. 26.🌈 Which colour is rgb(0, 255, 0)? (a) bright green (b) red (c) yellow (d) white
27. 27.🌈 Which colour of light is strongest in rgb(175, 55, 51)? (a) blue (b) red (c) green
28. 28.🌈 In #006400 the green part is the hex number 64. What is it as a normal number?
29. 29.🌈 In #0000b8 the blue part is the hex number b8. What is it as a normal number?
30. 30.🌈 In #00be00 the green part is the hex number be. What is it as a normal number?
31. 31.🌈 Which hex code is cyan? (a) #000000 (b) #ff00ff (c) #00ffff (d) #ff0000
32. 32.🌈 Which colour of light is strongest in rgb(21, 216, 10)? (a) red (b) green (c) blue
33. 33.🌈 Which colour of light is strongest in rgb(36, 24, 251)? (a) green (b) blue (c) red
34. 34.🌈 In #00f700 the green part is the hex number f7. What is it as a normal number?
35. 35.🌈 Which hex code is red? (a) #00ff00 (b) #ff0000 (c) #00ffff (d) #0000ff
36. 36.🌈 In #320000 the red part is the hex number 32. What is it as a normal number?
37. 37.🌈 Which colour of light is strongest in rgb(66, 232, 30)? (a) red (b) blue (c) green
38. 38.🌈 Which hex code is yellow? (a) #00ffff (b) #ff0000 (c) #ffff00 (d) #000000
39. 39.🌈 Which hex code is magenta? (a) #ffffff (b) #ffff00 (c) #ff00ff (d) #ff0000
40. 40.🌈 Which colour of light is strongest in rgb(97, 119, 191)? (a) green (b) blue (c) red

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