"Hvor mange nye hjul har bilen?"
Translation:How many new wheels does the car have?
Is there any difference in pronunciation between Christmas (jul) and wheel(s) (hjul)?
There is no difference in pronunciation - which allows young children to make lots of silly jokes especially in the Christmas season :-) And by the way, winter studded tires are called "piggdekk" so, once kids have learned some English, there are jokes about putting pigs on cars in October!
Etymology and cognates for those interested; https://en.m.wiktionary.org/wiki/Reconstruction:Proto-Germanic/hwehwlą