List of top Logical Reasoning Questions on Classification

Which letter is midway between the 13th letter from the left and the 4th letter from the right in the sequence given below?
USBEYFHKOPRAWCGJMQDIVLNTXZ

Find the odd one out: Onlookers, Theatre goers, Queue, Spectators
Find the odd one out: Heart, Lungs, Kidney, Skin, Liver
Find the odd-man out:
Find the odd one out: Symphony, Orchestra, Guitar, Mob
Of the four alternatives given, find the one which is different from the rest.