Since i am using Internet round about from 2001 i have not seen yet any domain name gained from free DNS providers listed in any search engine
what you think what the reason maybe?
free domain owner don't make effort
or search engines don't list them

Can you please give some examples of free domain names which are more then 5 years old and which are not indexed?

That is not the link between domain name and the SE placement. Any domain name can be on the first place for any keyword.

Would you please provide us with some examples to make your question more clearer,for us to answer.

Originally Posted by woodworm

Guyz,
If you have keyword in your domain name it will good for your site to get ranking in that keyword.

You know you may have good rankings even without keyword inside.