CSS Worksheet: Hex and RGB Colours

HTML and CSS lesson 15: Colours: hex and rgb · Set 329 · 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) 3 (b) 6 (c) 2 (d) 4
2. 2.🌈 In #0000e3 the blue part is the hex number e3. What is it as a normal number?
3. 3.🌈 Which hex code is cyan? (a) #00ffff (b) #00ff00 (c) #ff00ff (d) #ff0000
4. 4.🌈 In #1e0000 the red part is the hex number 1e. What is it as a normal number?
5. 5.🌈 In #a30000 the red part is the hex number a3. What is it as a normal number?
6. 6.🌈 What is the biggest number one colour can have in rgb()? (a) 255 (b) 1000 (c) 99 (d) 100
7. 7.🌈 Which colour of light is strongest in rgb(52, 249, 135)? (a) blue (b) green (c) red
8. 8.🌈 Which hex code is bright green? (a) #ffff00 (b) #000000 (c) #00ff00 (d) #ffffff
9. 9.🌈 In #008000 the green part is the hex number 80. What is it as a normal number?
10. 10.🌈 In #rrggbb, which colour do the first two digits give? (a) blue (b) black (c) red (d) green
11. 11.🌈 Which colour of light is strongest in rgb(69, 1, 179)? (a) blue (b) red (c) green
12. 12.🌈 Which hex code is black? (a) #00ffff (b) #00ff00 (c) #ff0000 (d) #000000
13. 13.🌈 Which colour is rgb(0, 255, 0)? (a) blue (b) red (c) bright green (d) black
14. 14.🌈 Which hex code is red? (a) #00ffff (b) #ffffff (c) #ff0000 (d) #ffff00
15. 15.🌈 Which colour is #ff00ff? (a) bright green (b) white (c) magenta (d) blue
16. 16.🌈 In #007200 the green part is the hex number 72. What is it as a normal number?
17. 17.🌈 In #rrggbb, which colour do the last two digits give? (a) blue (b) green (c) red (d) white
18. 18.🌈 In #e30000 the red part is the hex number e3. What is it as a normal number?
19. 19.🌈 Which colour is rgb(255, 0, 0)? (a) magenta (b) black (c) yellow (d) red
20. 20.🌈 Which hex code is magenta? (a) #ffff00 (b) #ff00ff (c) #ff0000 (d) #00ffff
21. 21.🌈 Which colour of light is strongest in rgb(33, 160, 19)? (a) blue (b) red (c) green
22. 22.🌈 In #960000 the red part is the hex number 96. What is it as a normal number?
23. 23.🌈 Which colour of light is strongest in rgb(156, 87, 55)? (a) green (b) blue (c) red
24. 24.🌈 Hex digits go 0 to 9, then A to which letter? (a) F (b) J (c) Z (d) G
25. 25.🌈 Which hex code is blue? (a) #000000 (b) #00ff00 (c) #00ffff (d) #0000ff
26. 26.🌈 Which colour is #000000? (a) black (b) white (c) cyan (d) red
27. 27.🌈 In #840000 the red part is the hex number 84. What is it as a normal number?
28. 28.🌈 In #f20000 the red part is the hex number f2. What is it as a normal number?
29. 29.🌈 Which colour of light is strongest in rgb(21, 111, 240)? (a) green (b) blue (c) red
30. 30.🌈 Which colour of light is strongest in rgb(110, 65, 237)? (a) red (b) green (c) blue
31. 31.🌈 Which colour is rgb(255, 255, 0)? (a) white (b) cyan (c) magenta (d) yellow
32. 32.🌈 In #004000 the green part is the hex number 40. What is it as a normal number?
33. 33.🌈 Which colour of light is strongest in rgb(24, 36, 150)? (a) green (b) red (c) blue
34. 34.🌈 In #280000 the red part is the hex number 28. What is it as a normal number?
35. 35.🌈 Which colour is rgb(255, 255, 255)? (a) white (b) blue (c) black (d) red
36. 36.🌈 In #00d700 the green part is the hex number d7. What is it as a normal number?
37. 37.🌈 Which colour is rgb(0, 0, 0)? (a) red (b) blue (c) black (d) bright green
38. 38.🌈 Which colour is #0000ff? (a) blue (b) cyan (c) white (d) magenta
39. 39.🌈 Which colour is #00ffff? (a) black (b) red (c) magenta (d) cyan
40. 40.🌈 Which colour is #00ff00? (a) red (b) cyan (c) bright green (d) black

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