In Choose odd pair of words type of questions, certain pairs of words are given out of which the words in all the pairs except one, bear a certain common relationship. The candidate is required to decipher this relationship and chose the pair in which the words are differently related, as the answer.
(Steel : Utensils) , (Bronze : Statue) , (Duralumin : Aircraft) , (Iron : Rails)
Justification: In all other pairs, first is the alloy used to make the second. (Iron is not an alloy, but a metal.)