superchargers, question 5: I believe refers to the slight increase in power seen up to FTH in a supercharged system due steady upper deck pressure and reduced atmospheric pressure (reduced backpressure effectively) improving the efficiency/flow.
Turbos: 6 - to the best of my knowledge, it depends completely upon the nature of the installation - there was a thread on this subject here not so many months ago.
Turbos: 7 - as 6.
Most of this stuff is in standard texts for license study, I also suspect from the nature of the questions they're straight out of an example paper or similar. Suggests a slight lack of application on behalf of the OP.