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2)Then what is the use of then oracle giving private RBS as
rollback_segments = ( RBS0, RBS1, RBS2, RBS3, RBS4, RBS5, RBS6 ) at init.ora .which is going to automatically brings the RBS online.
Remember that init.ora that is created during the initial database creation is only a template, which you are free to modify. The comented lines you are refering to are in there only as a reminder and are ment for Paralele Server only, although the comments are rather poor and insufficient. Note also that the content of the supplied init.ora is different for different releases and different platforms.