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Choose the pair that best represents a similar relationship to the one expressed in the original pair of words.

Seismograph : Earthquakes

1. Hygrometer : Torque
2. Viscometer : Elasticity
3. Fathometer : Gravity
4. Udometer : Rain

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Correct Answer - Option 4 : Udometer : Rain


A seismograph is an instrument is used to detect and record the Earthquakes


A rain gauge also known as an udometer is used to gather and measure the amount of liquid precipitation over an area in a predefined area, period of time.

Hence, the correct answer is "Udometer : Rain".

Instrument Measures
Hygrometer Humidity
Viscometer Viscosity
Fathometer Depth of Ocean


Students often get confused between Hygrometer and Hydrometer.

Hygrometer is used to measure Humidity whereas Hydrometer measures Relative Density. 

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