Which amongst the following is NOT a factor that causes an earthquake?

1. Folding and faulting
2. Volcanoes
3. Lava
4. Plate tectonics

Which waves are recorded on a seismograph after the P waves?

1. Primary waves
2. Push waves
3. Shear waves
4. Surface waves

The point on the earth's surface directly above the seismic focus is called:

1. Epicentre
2. Seismic focus
3. Seismograph
4. Mercalli

The instrument that grades the earthquakes on the basis of observed effects on a 12-point scale.

1. Thermometer
2. Seismograph
3. Richter scale
4. Mercalli scale