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The intensity of earthquake is measured by
1. Barometer
2. Hydrometer
3. Polygraph
4. Seismograph

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Correct Answer - Option 4 : Seismograph

The correct answer is Seismograph.

  • A seismometer is an instrument that responds to ground motions, such as caused by earthquakes, volcanic eruptions, and explosions.
    • Seismometers are gradually combined with a timing device and a recording device to form a seismograph.
    • The output of such a device is earlier recorded on paper (see picture) or film, now recorded and processed digitally—is a seismogram.
    • Such data is used to pinpoint and characterize earthquakes, and to study the Earth's internal structure.

  • Barometer - Atmospheric Pressure
  • Hydrometer - Specific Gravity
  • Polygraph - Blood Pressure, changes in one's breathing, and sweating on the palms.

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