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Which of the following instruments is used to measure the magnitude of an earthquake?

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Which of the following instruments is used to measure the magnitude of an earthquake?

(a) Seismograph

(b) Speedometer

(c) Ammeter

(d) Richter scale

This question was posed to me during a job interview.

My question is taken from Earthquake Terminology and Seismic Effects on Buildings in section Earthquake Resistant Buildings of Construction & Building Materials

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The correct choice is (d) Richter scale

For explanation: Richter scale is used to measure the magnitude of an earthquake. Magnitude of an earthquake refers to the quantitative measure of the actual size of an earthquake. Therefore, the magnitude of an earthquake is a number that is a measure of the energy released in the earthquake.

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