"What time does the movie start?"
This seems out of place for the Health Lesson Group.
几点 represents time so it must go before.
You are asking when the movie starts instead of what time.
It sounds similar in english but in chinese there is a subtle difference.
That would be incorrect, 吗 (and 是不是) is only used for yes/no questions, in a nutshell they change a statement into a question.