What time do you get up AT?

[Soleil]

Hello! Does it sound natural to add prepositions at the end of questions?

What time do you get up AT?

What does he use it FOR? - I think that in this case it's compulsory. Am I right?

 

[Barque]

What time do you get up AT?

This doesn't sound natural. You'd usually hear "What time do you get/wake up?"

But a possible answer (among others) is "I get up at 6".

What does he use it FOR? - I think that in this case it's compulsory. Am I right?

Yes. This is fine.

 

[Tdol]

Hello! Does it sound natural to add prepositions at the end of questions?

If they are required, there's nothing wrong or unnatural nowadays with putting them at the end.