CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 259 · 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.🌈 How many pairs of hex digits are in a colour like #ff8800? (a) 6 (b) 2 (c) 4 (d) 3
2. 2.🌈 Which hex code is black? (a) #ffffff (b) #0000ff (c) #000000 (d) #00ff00
3. 3.🌈 Which hex code is red? (a) #ff0000 (b) #ffff00 (c) #00ff00 (d) #0000ff
4. 4.🌈 Which hex code is white? (a) #00ff00 (b) #00ffff (c) #ffffff (d) #ff00ff
5. 5.🌈 Which colour is #00ffff? (a) cyan (b) blue (c) red (d) magenta
6. 6.🌈 Hex digits go 0 to 9, then A to which letter? (a) Z (b) G (c) F (d) J
7. 7.🌈 Which hex code is magenta? (a) #ff00ff (b) #ffff00 (c) #ff0000 (d) #0000ff
8. 8.🌈 What is the biggest number one colour can have in rgb()? (a) 100 (b) 99 (c) 255 (d) 1000
9. 9.🌈 Which colour is #0000ff? (a) red (b) blue (c) cyan (d) yellow
10. 10.🌈 Which colour of light is strongest in rgb(11, 195, 54)? (a) blue (b) red (c) green
11. 11.🌈 In #rrggbb, which colour do the first two digits give? (a) black (b) red (c) green (d) blue
12. 12.🌈 Which colour of light is strongest in rgb(86, 123, 164)? (a) green (b) blue (c) red
13. 13.🌈 In #0000c6 the blue part is the hex number c6. What is it as a normal number?
14. 14.🌈 Which colour is #ff00ff? (a) cyan (b) red (c) yellow (d) magenta
15. 15.🌈 In #003e00 the green part is the hex number 3e. What is it as a normal number?
16. 16.🌈 Which colour is rgb(0, 0, 255)? (a) blue (b) red (c) yellow (d) cyan
17. 17.🌈 Which colour is rgb(255, 0, 0)? (a) red (b) yellow (c) white (d) blue
18. 18.🌈 Which colour is rgb(255, 255, 255)? (a) white (b) red (c) blue (d) magenta
19. 19.🌈 Which colour is #ffff00? (a) bright green (b) white (c) red (d) yellow
20. 20.🌈 In #9f0000 the red part is the hex number 9f. What is it as a normal number?
21. 21.🌈 In #120000 the red part is the hex number 12. What is it as a normal number?
22. 22.🌈 In #001b00 the green part is the hex number 1b. What is it as a normal number?
23. 23.🌈 Which colour of light is strongest in rgb(78, 49, 203)? (a) green (b) red (c) blue
24. 24.🌈 Which colour of light is strongest in rgb(115, 251, 45)? (a) blue (b) green (c) red
25. 25.🌈 Which hex code is yellow? (a) #00ffff (b) #ff00ff (c) #000000 (d) #ffff00
26. 26.🌈 Which colour is #ff0000? (a) black (b) magenta (c) red (d) white
27. 27.🌈 Which colour of light is strongest in rgb(24, 5, 185)? (a) blue (b) green (c) red
28. 28.🌈 In #7e0000 the red part is the hex number 7e. What is it as a normal number?
29. 29.🌈 In #00f200 the green part is the hex number f2. What is it as a normal number?
30. 30.🌈 In #0000d7 the blue part is the hex number d7. What is it as a normal number?
31. 31.🌈 In #00009f the blue part is the hex number 9f. What is it as a normal number?
32. 32.🌈 Which colour is rgb(0, 0, 0)? (a) black (b) cyan (c) bright green (d) blue
33. 33.🌈 Which colour of light is strongest in rgb(10, 60, 166)? (a) blue (b) green (c) red
34. 34.🌈 Which colour is #000000? (a) blue (b) black (c) magenta (d) white
35. 35.🌈 Which colour is rgb(255, 255, 0)? (a) yellow (b) blue (c) magenta (d) white
36. 36.🌈 Which colour is rgb(255, 0, 255)? (a) black (b) magenta (c) red (d) yellow
37. 37.🌈 In #000032 the blue part is the hex number 32. What is it as a normal number?
38. 38.🌈 Which colour of light is strongest in rgb(62, 66, 204)? (a) green (b) red (c) blue
39. 39.🌈 Which colour is #00ff00? (a) bright green (b) cyan (c) red (d) black
40. 40.🌈 Which hex code is bright green? (a) #ffff00 (b) #00ff00 (c) #0000ff (d) #000000

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