Seismograph : Earthquake :: Tachometer : ?
AVolcanoes
BResistance
CLandslides
DStrains ✓ Correct
Correct answer: (D) Strains
Explanation
Tachometer pairs with Strains.
The pair links a measuring instrument with the physical quantity it registers.
A seismograph registers earthquakes.
On the same instrument-and-quantity pattern the registered quantity is strains.
The quantity paired here is strains.
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