Hello to every one,
i knew some of websites like yahoo answers,mosaichub. but i need to aware about more sites. post your suggestions

You can also try focusing on websites like Answers, Quora, Askpedia, Answerbank.

I am using Quora.com, answers.com, reddit, ask.com. You may take a look at this and choose what you can use.

@otisgross Is ask.com fruitful? I means I have tried checking it out and questions over their give a little odd feeling ! So, I was wondering if... ?? Anyway what forget to add over here is Yahoo Answers, it does yields good results.