Probably not. But Scandinavian authorities search restaurants etc from time to time and check for working-visas for non-EU citizens.
they wont check for specific people. Its quite a large city from what i hear.
It's not the Soviet Union. But I guess, if you never attend classes, your student-visa will be terminated.
again, not necessary. you can simply go and join another course or university and have your visa extended.
& who are these Scandinavian Authorities?
the consulates mostly, but i wouldn't count on it.