"Why is your car small?"
Translation:Proč je tvoje auto malé?
Same sentence structure as English applies here. You wouldn't say "Why your car is small?", you would say "Why IS your car small?". But this is clearly for purely learning, considering no one would ever ask that question like that. How would one answer that anyway? "Cause I couldn't afford a bigger one?" haha
If anything, one would ask "Why do you have a small car?"...Because I prefer it; better mileage; etc.