Located on the outskirts of Cubbon Park is the Visvesvaraya Industrial & Technological Museum. This place is really for the kids, it was kind of fun and is worth a look.
The museum itself is huge, there are about 5 levels, each level has 2 'categories' for exhibits. The exhibits are OK, a lot of them dont work, but all of the kids seemed to love it
Entry is just 25/- (less than a dollar)
In an old museum, this is four floors of the history of technology up to now with numerous hands-on displays. Not as up to date as one might expect from this city and some of the displays were less than exciting (write your name in binary code!) but not a bad place to kill an hour or two, especially if you are traveling with children.