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A seismometer works on the principle that a suspended mass

  • A.vibrates only at the frequency of the earthquake
  • B.tends to remain at rest while the frame moves with the ground
  • C.moves faster than the ground during shaking
  • D.is attracted towards the source of the earthquake

Answer: B

Inertia keeps the mass nearly stationary while the case, fixed to the ground, moves around it, and the relative displacement is what is recorded. The instrument therefore measures motion of the ground with respect to an approximately fixed reference.

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