I am currently writing my proposal on E-learning towards a learning society. I Have try some research questions how can I know whether these question are good for a PhD?
research question
1. Do e-learning really differ from conventional learning?
2. Whether learner learns differently using an e-learning system or it is just an assumption??
3. What are the implications for the schools in adopting e-learning?

What angle are you coming from, for or against e-learning? Be careful of bias and what about the importance of social aspects of learning? What are you hoping to find out, is it a social exploration, psychological analysis of how the mind learns in differnt methods or are you looking at increased performance and economic outputs as implications for the school? Also which school, context will be important as you would expect differing results between different types ,Primary/Secondary, state/independant urban/rural etc.

Maybe you need to be more specific in a title and the questions will come from that. For example if you chose a student comparison between 'conventional' and 'e-learning' you're title might look something like 'Do students in an inner city secondary school report better learning experiences from e-learning compared to conventional teaching techniques? In answer to the title I will
1. Identify conventional learning methods available.
2. Explore e-learning options.
3. Compare identified conventional methods against e-learning options.
4. Specify students preferences in learning method.

Be specific with what you mean by conventional and e-learning as in context back in the 1800's chalk and board were 'conventional' then blackboards, then whiteboards. It could be argued that e-lerning through interactive boards is now conventional in some schools.

Of course you can check with the uni you are applying to how they like the research questions written some like action statements whilst other like them expresed as questions, it is also common for the questions to be re-written several times in the first year with help from your supervisor to get them just right! It's an interesting topic.
Good luck :-)

I second that - research questions get changed as the project progresses