I know that we are not supposed to consider any doubt a dummy doubt... but, REALLY??? What kind of master is that?
Reffer to here. It does not says that o need an attack to hit the spell, just see your target.
Also, on "Aiming a Spell" it says about conditions to aim a spell. Some spells are Targeted and some spells has an Effect.
It seens logical to me by the above sentence that, if an spells is Targeted it is not an Effect and vice-verse.
The same applys to the types of spell's Effect. If it is a Ray spell (that normally need a ranged touch attack), it is not a Cone spell, neihter a Burst spell, that does not need a ranged touch attack.
If it is not enought, you can check rules for (for instance) Ray of Enfeeblement. It explicitly says
You must succeed on a ranged touch attack to strike a target.
As it does any spell that requires a ranged touch attack to strike the target.