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Question

Give Scientific reasons. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> [Textbook Question 2c,d pg no.66]
  1. Don’t use lifts at the time of earthquake.
  2. The foundation of earthquake- proof building is separated from lower land.

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Solution

Answer:
  1. Lifts or elevators run on electricity. The electricity supply can be hindered due to earthquake. There may be chances of fire due to short circuit. We may get trapped in the elevator at such times. The building may also collapse due to earthquake. It is always better to use stairs at the time of such calamities, so that one can safely come out of the building. Therefore, it is said that lifts should not be used at the time of earthquakes.
  2. The surface of the earth trembles at the time of earthquake. These tremors cause seismic waves which are responsible for the movements of the earth’s surface. The ground thus shakes or it goes up-down. These shocks and waves formed in the interior of the earth spread on the surface in all directions. This causes collapse of the building and other structures on the land.To prevent such disasters the foundation of earth-quake proof building is separated from lower land.

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