Question

On which principle does a seismograph work?

• A. Principle of inertia.
• B. Principle of conservation of momentum.
• C. Principle of gravitational force.
• D. None of the above.

Answer 1

The correct option is A Principle of inertia.

Seismograph works on the principle of inertia to measure the depth and force of earthquake. The sudden force of earthquake, makes the scale pointer to move and after the tremor, the pointer comes back to its initial position due to its inertia of rest.