Yes, that is possible as long as each fixture has its own pull chain, unless you connect multiple fixtures to one switch. All fixtures on one switch must be on the same circuit. Fixtures on different circuits need at least one switch for each of the circuits. If you are running conduit, why not install a standard switch in a box on the wall. That way you don't have to worry about overloading a small pull switch (you did not state the rating of the pull switch-some may not handle all your fixtures.)