Do u think google is best?

it depends on what you are looking for, sometimes, if you copy and paste a sentence from a website onto google, it might show some other site with that content!!(obviously you would expect the top result to be the site from which you copied)

no as sometimes google network always be low but i prefer that you use yahoo as it is reliable and the features offered are awsome.

yes google search engine best one, because result page return on PageRank(PR) algorithm

yes google is the search engine which is rated after yahoo coz its easy to surf and do research.