CHAPTER:8 EARTHQUAKES

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

• Epicentre
• Seismic focus
• Seismograph
• Mercalli

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

• Thermometer
• Seismograph
• Richter scale
• Mercalli scale

Which, amongst the following is not a destructive effect of earthquakes?

• Submergence
• Landslides
• Energy release
• Tsunami

A large destructive ocean wave that can be generated by any disturbance (earthquakes, volcanoes etc) that rapidly displaces a large mass of water:

• Submergence
• Tsunami
• Landform
• Volcano

which waves are recorded on a seismograph after P waves?

• Primary waves
• Push waves
• Shear waves
• Surface waves