Q59 of 84 Page 290

The waves generated by the earthquake tremors are called:

The tremors produce waves on the surface of the earth. These are called seismic waves. These waves are recorded by the seismograph.

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57

An earthquake of magnitude 2 on Richter scale is:

 58

The epicentre of an earthquake is:

 60

When an object gets negatively charged by the process of friction, then:

 61

The device used for detecting charge (positive or negative) on an object is called: