Ideaz and confusions

something  i read today.. it was worth sharing.. so here it is... .."Some time ago I received a call from a colleague. He was about to give a student a zero for his answer to a physics question, while the student claimed a perfect score. The instructor and the student agreed to an impartial arbiter, and I was selected. I read the examination question: "SHOW HOW IS IT POSSIBLE TO DETERMINE THE HEIGHT OF A TALL BUILDING WITH THE AID OF A BAROMETER." The student had answered, "Take the barometer to the top of the building,   attach a long rope to it, lower it to the street, and then bring the rope   up, measuring the length of the rope. The length of the rope is the height   of the building." The student really had a strong case for full credit since he had really   answered the question completely and correctly! On the other hand, if full   credit were given, it could well contribute to a high grade in his physics   course and to certify competence in ph