Four instruments have been given, out of which three are alike in some manner and one is different. Select the one that is different from the rest:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Decibelmeter
Option (1) Udometer — a rain gauge, which measures the amount of rainfall.
Option (2) Decibelmeter — a sound level meter, which measures the loudness of sound in decibels. It is the only one that has nothing to do with rain, so the decibelmeter is the odd one out.
Option (3) Ombrometer — another name for a rain gauge.
Option (4) Pluviometer — also a rain gauge (Latin pluvia, rain).