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Question
Which of the following instrument is used to record the earthquake wave?
Options:
A .  Hydrograph
B .  Seismograph
C .  Richter scale
D .  Pycnometer
Answer: Option B
A SEISMOGRAPH WHICH IS ALSO CALLED AS A SEISMOMETER, IS AN INSTRUMENT WHICH IS USED TO DETECT AND RECORD THE EARTHQUAKE WAVES. THE FIRST SEISMOGRAPH WAS INVENTED IN 132 A.D.

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