CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 26 · 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) #0000ff (b) #00ff00 (c) #ff00ff (d) #000000
2. 2.🌈 Which colour is #0000ff? (a) white (b) red (c) black (d) blue
3. 3.🌈 In #rrggbb, which colour do the last two digits give? (a) red (b) blue (c) white (d) green
4. 4.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) green (c) black (d) red
5. 5.🌈 In #00002a the blue part is the hex number 2a. What is it as a normal number?
6. 6.🌈 Which colour is #000000? (a) bright green (b) black (c) magenta (d) blue
7. 7.🌈 Which colour is #ffff00? (a) bright green (b) yellow (c) cyan (d) red
8. 8.🌈 Which colour is #00ffff? (a) red (b) blue (c) cyan (d) white
9. 9.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 4 (c) 3 (d) 2
10. 10.🌈 Which colour is #ff00ff? (a) yellow (b) red (c) magenta (d) blue
11. 11.🌈 Which colour of light is strongest in rgb(58, 232, 65)? (a) green (b) blue (c) red
12. 12.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) J (c) G (d) F
13. 13.🌈 Which hex code is bright green? (a) #00ff00 (b) #00ffff (c) #000000 (d) #0000ff
14. 14.🌈 What is the biggest number one colour can have in rgb()? (a) 99 (b) 100 (c) 255 (d) 1000
15. 15.🌈 Which colour is rgb(0, 255, 0)? (a) black (b) red (c) bright green (d) yellow
16. 16.🌈 Which colour of light is strongest in rgb(186, 63, 39)? (a) green (b) blue (c) red
17. 17.🌈 In #004d00 the green part is the hex number 4d. What is it as a normal number?
18. 18.🌈 Which colour is rgb(255, 0, 255)? (a) red (b) white (c) blue (d) magenta
19. 19.🌈 In #00003f the blue part is the hex number 3f. What is it as a normal number?
20. 20.🌈 Which colour of light is strongest in rgb(126, 189, 107)? (a) red (b) blue (c) green
21. 21.🌈 Which colour is rgb(0, 0, 0)? (a) blue (b) black (c) cyan (d) white
22. 22.🌈 Which colour is #ffffff? (a) white (b) cyan (c) red (d) bright green
23. 23.🌈 Which colour of light is strongest in rgb(15, 175, 76)? (a) blue (b) red (c) green
24. 24.🌈 Which colour of light is strongest in rgb(40, 206, 0)? (a) blue (b) red (c) green
25. 25.🌈 Which colour of light is strongest in rgb(96, 38, 177)? (a) red (b) blue (c) green
26. 26.🌈 Which colour is #00ff00? (a) bright green (b) red (c) white (d) black
27. 27.🌈 Which colour is rgb(0, 0, 255)? (a) bright green (b) yellow (c) blue (d) white
28. 28.🌈 Which colour of light is strongest in rgb(166, 13, 81)? (a) green (b) blue (c) red
29. 29.🌈 Which colour of light is strongest in rgb(89, 97, 164)? (a) red (b) green (c) blue
30. 30.🌈 Which colour is rgb(255, 255, 255)? (a) cyan (b) blue (c) white (d) yellow
31. 31.🌈 Which hex code is cyan? (a) #ff00ff (b) #ff0000 (c) #ffff00 (d) #00ffff
32. 32.🌈 Which colour is rgb(0, 255, 255)? (a) red (b) cyan (c) white (d) bright green
33. 33.🌈 In #004700 the green part is the hex number 47. What is it as a normal number?
34. 34.🌈 Which colour of light is strongest in rgb(129, 201, 128)? (a) green (b) red (c) blue
35. 35.🌈 In #0000e9 the blue part is the hex number e9. What is it as a normal number?
36. 36.🌈 Which colour of light is strongest in rgb(0, 161, 99)? (a) red (b) green (c) blue
37. 37.🌈 In #f20000 the red part is the hex number f2. What is it as a normal number?
38. 38.🌈 Which colour of light is strongest in rgb(19, 48, 164)? (a) red (b) blue (c) green
39. 39.🌈 Which colour of light is strongest in rgb(43, 25, 187)? (a) red (b) blue (c) green
40. 40.🌈 Which hex code is black? (a) #ffffff (b) #ff00ff (c) #00ffff (d) #000000

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