CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 137 · 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 of light is strongest in rgb(103, 65, 152)? (a) green (b) blue (c) red
2. 2.🌈 Which colour is rgb(0, 255, 0)? (a) cyan (b) magenta (c) black (d) bright green
3. 3.🌈 Which hex code is black? (a) #00ffff (b) #ffffff (c) #000000 (d) #ff00ff
4. 4.🌈 In #rrggbb, which colour do the last two digits give? (a) white (b) blue (c) red (d) green
5. 5.🌈 Which colour of light is strongest in rgb(99, 182, 35)? (a) blue (b) green (c) red
6. 6.🌈 In #rrggbb, which colour do the first two digits give? (a) red (b) blue (c) black (d) green
7. 7.🌈 In #340000 the red part is the hex number 34. What is it as a normal number?
8. 8.🌈 In #440000 the red part is the hex number 44. What is it as a normal number?
9. 9.🌈 In #009f00 the green part is the hex number 9f. What is it as a normal number?
10. 10.🌈 Which colour of light is strongest in rgb(103, 168, 108)? (a) blue (b) red (c) green
11. 11.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) J (c) F (d) G
12. 12.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) blue (c) yellow (d) cyan
13. 13.🌈 Which colour is rgb(0, 255, 255)? (a) white (b) yellow (c) red (d) cyan
14. 14.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 2 (b) 3 (c) 4 (d) 6
15. 15.🌈 In #0000f3 the blue part is the hex number f3. What is it as a normal number?
16. 16.🌈 Which hex code is blue? (a) #00ffff (b) #000000 (c) #ff0000 (d) #0000ff
17. 17.🌈 In #110000 the red part is the hex number 11. What is it as a normal number?
18. 18.🌈 Which colour is rgb(255, 0, 0)? (a) cyan (b) yellow (c) bright green (d) red
19. 19.🌈 Which colour is rgb(255, 0, 255)? (a) blue (b) magenta (c) red (d) white
20. 20.🌈 Which colour of light is strongest in rgb(107, 202, 135)? (a) red (b) blue (c) green
21. 21.🌈 In #000018 the blue part is the hex number 18. What is it as a normal number?
22. 22.🌈 Which hex code is bright green? (a) #00ff00 (b) #00ffff (c) #000000 (d) #ff0000
23. 23.🌈 Which colour is #ffffff? (a) yellow (b) blue (c) white (d) bright green
24. 24.🌈 Which colour of light is strongest in rgb(211, 19, 31)? (a) green (b) blue (c) red
25. 25.🌈 Which colour is #000000? (a) red (b) bright green (c) blue (d) black
26. 26.🌈 In #00e700 the green part is the hex number e7. What is it as a normal number?
27. 27.🌈 Which colour is rgb(0, 0, 255)? (a) bright green (b) magenta (c) red (d) blue
28. 28.🌈 In #000800 the green part is the hex number 08. What is it as a normal number?
29. 29.🌈 Which colour is #0000ff? (a) blue (b) bright green (c) red (d) magenta
30. 30.🌈 Which colour of light is strongest in rgb(104, 185, 42)? (a) green (b) red (c) blue
31. 31.🌈 Which hex code is white? (a) #00ffff (b) #ffffff (c) #00ff00 (d) #0000ff
32. 32.🌈 Which hex code is yellow? (a) #ffffff (b) #ffff00 (c) #000000 (d) #0000ff
33. 33.🌈 In #d40000 the red part is the hex number d4. What is it as a normal number?
34. 34.🌈 Which colour of light is strongest in rgb(30, 90, 163)? (a) red (b) blue (c) green
35. 35.🌈 Which colour of light is strongest in rgb(179, 3, 62)? (a) blue (b) green (c) red
36. 36.🌈 In #000050 the blue part is the hex number 50. What is it as a normal number?
37. 37.🌈 Which hex code is red? (a) #00ff00 (b) #0000ff (c) #00ffff (d) #ff0000
38. 38.🌈 Which colour is rgb(255, 255, 0)? (a) red (b) yellow (c) black (d) blue
39. 39.🌈 Which colour is #ff0000? (a) cyan (b) red (c) bright green (d) blue
40. 40.🌈 Which colour of light is strongest in rgb(129, 156, 90)? (a) blue (b) red (c) green

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