the most controversial 3 quetions, 8, 9 and 10.
for 8 im agree with everyone who got A coz it is, well proof is, it asks variation in magnetic flux, flux is calculated by theta=BxAcosY, confusion is, its Y is the angle between the perpendicular of the flux and area, if u know what i mean, where B is magnetic field strength and A is area or coil, therefore greatest when the area is perpendicular to the magnetic field
question 9 is B its to long to explain, but u can go to this link and check it out for urself. oh yeah, about it not have a split ring commutator, doesnt make it AC, it all depends on rate of change of magnetic flux through the coil or in this case disc.
http://www.zamandayolculuk.com/cetinbal/faradaydisk.htm kindly provided by RingerINC
question 10 has many uncertainties, im not to sure either, it doesnt say wether its AC or DC, and another thing im not sure about, but can help in the investigation of the real answer is wether the induced current in the second coil flows in the same direction as that of the original one, or does it flow in the opposite direction??