1. What puts a smile on your face? Is there a particular event, a particular topic that makes your whole face just lighten up? Whatever it is that makes you smile, and makes you happy whenever you encounter it, this is a sign of something you are passionate about.
2. What do you find easy? Usually, what we find easy for us to do, will be related to what we are passionate about. It’s very hard to hate something that is very easy for us!
3. What sparks your creativity? Think about something in your life where you seem to always expand its horizon, always coming up with new, fun, and exciting ideas relating to that subject. Whatever makes you creative is probably something that you are very passionate about.
4. What would you do for free?. Doing what you have a passion for brings out your best, and this leads to greatness. Greatness breezes to success. So think about something that you would just love to do, even if you were not getting paid. Think about something that you look forward to doing, something that you wish you could do all the time.
5. What do you like to talk about? The topics of conversation we have can definitely tell what we are interested in, and this is a good way to find out what we really enjoy in life.
6. What makes you unafraid of failure? When we do what we are passionate about, we have total confidence in our abilities. This makes us not worry about failing, because in our mind, how can we fail when we do what we love?
7. What would you regret not having tried? If you were at the end of your life, what would you regret not having pursued? What would you have liked to do, that you didn’t get a chance to? Think about what that might be. Whatever it is that you may experience regret now or later on for not having tried, this is a good chance to be your true passion.
Source: http://www.ineedmotivation.com/blog/2008/04/7-questions-to-finding-your-true-passion/ (Abridged)