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.

Choose or find odd pair of words

(Pistol : Gun) , (Knife : Dagger) , (Engine : Train) , (Car : Bus)

A. Pistol : Gun
B. Knife : Dagger
C. Engine : Train
D. Car : Bus
Answer: C . Engine : Train

Justification: In all other pairs, the two words belong to the same class.