You have to use the sources in both questions, thats what they're there for, to be used! With the first question you make a point and use the sources to show how this is true, this shows the examiner your own knowledge but also skills of being able to use other things to support this knowledge and your view.
The Second question is more heavily weighted on your own knowledge, but you still should use the sources, they're put there to help you and to be used, so use them! You need the sources to support the argument and help you develop it.
In both questions you need to cross reference, never use a source on its own, so for example say source a shows.... then immediately after say 'this is supported by/different to source.. which shows...'
Also, if the question says use sources A and B, you have to use them! only using 1 will limit you to half marks or using neither will put you in about a D or E grade
This was all said to us by our teacher who marks for the course and was told to look for these things, so it should be right (hopefully)
Hope this ramble helps, and goodluck for it!