After getting connected to Tor, when other internet browsers are configured on socks 127.0.0.1:9150 will their internet activity remain hidden from Internet Service providers and Trackers?
Yes. Tor acts as a filter in a way, encrypting and pumping into the tor network any communications sent through its proxy port of
127.0.0.1:9150. Any browser using this port correctly will have its connection torified, and check.torproject.org will show a green onion if the browser is configured correctly.
Warning: Tor will only torify connections sent to its proxy port. It will not proxify connections from applets or plugins using settings differing from your browser. Always consider connections made from a plugin not known to use proxy settings correctly as unsecured and traceable.
If I use Tor browser bundle for windows, other browsers are not automatically torified, so, to torify other browsers, you will have to use ADVTor: http://sourceforge.net/projects/advtor/
there is an option to run specific application through ADVtor software.
Maybe it is different in linux, but as far as I know, here are some explanations: https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO#Howtotorifyspecificprograms