18. भूकंप की तीव्रता मापते हैं
O थर्मामीटर से
O बैरोमीटर से
OOOO
O सिस्मोग्राफ से
O रेन गेज से
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0 none of these
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सिस्मोग्राफ से because it is used by scientists to know how big earth quake is
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