1. B
2. It depends on the manufacturer. Fokker 70/100 says that this isn't icing conditions, Embraer 190 says it is and Engine only required. In both cases, iginition is recommended to be left in "Auto" rather than "On", so tell the examiner to KFO. I'm sure every other manufacturer will have a different answer.
3. B - Three millimeters of ice allowed under the wings on the above types.
4. A - You don't get owt for nowt!
PM