Question no. not written on answer. will and be ignored?

Hey, relax.... such things happen at times. It is indeed a pertinent mistake which basically should have been taken care of. If it is just one or two questions, you may have a narrow escape. But if it s the whole answer paper, I can t say.. Anyway, take this as an experience, be careful in exams as well as everything you do from now on. Nothing to worry, dear, this is just an exam! 

if u hav written on the front sheet the ques u attempted then u need not worry

cheers