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

(Volume : Litre), (Time : Second), (Length : Metre), (Resistance : Ohm), (Pressure : Barometer)

A. Volume : Litre
B. Time : Second
C. Length : Metre
D. Resistance : Ohm
E. Pressure : Barometer
Answer: E . Pressure : Barometer


Clearly, the answer is (e).
In all other pairs, second is the unit to measure the first. On the other hand, barometer is an instrument.