Question

the intensity of an earthquake is measured by a ______.

a barometer

b polygraph

c hydrometer

d seismograph

Explanation:

• A barometer measures atmospheric pressure, not earthquake intensity.
• A polygraph is used to detect lies, not seismic activity.
• A hydrometer measures liquid density, not earthquakes.
• A seismograph is the instrument designed to measure and record earthquake intensity and seismic waves.

Answer:

d. Seismograph