Are these good research questions? Why?

Exercise: Are these good research questions? Why?

1. Is coffee good or bad?
2. The history of coffee.
3. Why do people drink coffee?
4. How much does a latte cost in the coffee shop at the corner of Grand and Wythe?
5. What kind of coffee did Shakespeare drink when he woke up every morning?
6. How do we solve coffee breath?
7. How many cups of espresso a day are most beneficial to human bodies?
8. Does caffeine increase one's blood oxygen?
9. What is the effect of caffeine on one's blood oxygen?
10. How many cups of espresso a day would maximize one's blood oxgyen?
11. How many cups of espresso a day would maximally extend one's life expectancy?