'ANY' for singular or plural?

Do you have any questions? 
OR 
Do you have any question?

The correct one is;
Do you have any questions?

Any is usually used with uncountable nouns and plural countable nouns (NOT with singular countable nouns). 

Here are some other sentence examples:

> Do you have a pen? (singular countable)
> Do you have any pens? (plural countable)
> Do you have any money? (uncountable)

OMG! What????? You don't know what countable, uncountable, singular and plural are??
You'd better check it out yourselves! hahahaha