Vegetables are good for your health.
1 (альтернативный): Are vegetables good or bad for your health ?
2 (общий): Are vegetables good for your health ?
3 (специальный): What are vegetables good for ?
4 (разделительный вопрос): Vegetables are good for your health, aren't they?
5 (вопрос к подлежащему): What is good for your health?