The intensity of a earth quake is measured by
-
Barometer
-
Hydrometer
-
Polygraph
-
Seismograph
D
Correct answer
Explanation
A seismograph is the instrument used to detect and record the intensity of earthquakes. It measures the vibrations of the ground caused by seismic waves and produces a seismogram. Barometer measures atmospheric pressure, hydrometer measures liquid density, and polygraph is a lie detector.