Directions : In the following, three or four alternatives are same in a certain way out of four or five and so form a group. Find the odd word that does not belong to the group.
a) Hydrometer
Options:
A .  Hydrometer
B .  Barometer
C .  Diameter
D .  Hygrometer
Answer: Option C Answer: (c) All others are apparatus to measure something.
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