Difference between sign and notice

[Rich7]

Test No. incompl/advan-73 "At the End of the Day (2)", question 5

put a ......... outside your door stating: Do not disturb - having 40 winks.

(a) notice
(b) board
(c) sign
(d) tablet

Test No. incompl/advan-73 "At the End of the Day (2)", answer 5

put a notice outside your door stating: Do not disturb - having 40 winks.

Correct answer: (a) notice

Your answer was: incorrect
put a sign outside your door stating: Do not disturb - having 40 winks.
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what would be the difference if I used "a sign outside" my door.....

[Alan]

Notice is needed here because it would provide a specific piece of written information of a temporary nature like wet paint/no milk today. Sign would indicate a direction or a place to go to or an official designation like no smoking, which would be permanent.
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English as a Second Language
You can read my ESL story Present Simple

[Rich7]

I gotcha?????