As per comment on my answer , i got confused about the use of copied content. As per old meta post, i though using a copied content is ok till i mention the source and done my own effort too. I want to know that is this answer is ok or not?
Its not 'wrong' per se, if you comply with the other sites requirements for using their material (as you reference in the meta post in this question). You will never see me close or complain to you about such an answer. You've done some research and found another site which answers the question.
However (in my opinion), your answers where you are just copying large sections from Wikipedia or TV-Tropes is not adding a great deal. It is better than just posting a link to the other site, but in my opinion not much better.
It would (IMHO) be better if you summarize in your own words a direct answer to the question based on the research you have done, and link to any references you have.