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Understanding Earthquakes and Their Measurement

Science

This document explains the magnitude of earthquakes, the Richter scale, seismographs, and important terms related to earthquakes like seismic focus, focal depth, and epicentre. It also details the damaging effects of earthquakes, including structural damage, landslides, and tsunamis, and includes multiple-choice questions for assessment.

Earthquakes Seismology Natural Disasters
23 Questions Easy Ages 10+ Mar 10, 2026

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About this Study Set

This study set covers Science through 23 practice questions. This document explains the magnitude of earthquakes, the Richter scale, seismographs, and important terms related to earthquakes like seismic focus, focal depth, and epicentre. It also details the damaging effects of earthquakes, including structural damage, landslides, and tsunamis, and includes multiple-choice questions for assessment. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 23 questions from the Understanding Earthquakes and Their Measurement study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the best-known scale used to describe the magnitude of an earthquake?
  • A Mercalli scale
  • B Richter scale
  • C Moment Magnitude scale
  • D Saffir-Simpson scale
2 The Richter scale gives a measure of the energy released at the earthquake's ______.
  • A epicentre
  • B surface
  • C focus
  • D fault line
3 Who devised the Richter scale?
  • A Charles Darwin
  • B Albert Einstein
  • C Charles E. Richter
  • D Galileo Galilei
4 What is the typical range of the Richter scale?
  • A 1 to 5
  • B 0 to 10
  • C 1 to 10
  • D 0 to 12
5 An instrument that detects and records the intensity of seismic waves generated by an earthquake is called a(n) ______.
  • A barometer
  • B seismograph
  • C altimeter
  • D thermometer
6 A place of origin of an earthquake inside the earth is called the ______.
  • A epicentre
  • B fault
  • C seismic focus
  • D crust
7 The depth of the seismic focus below the earth's surface is called the ______.
  • A epicentral distance
  • B focal depth
  • C seismic radius
  • D crustal thickness
8 The point on the surface of the earth directly above the focus of an earthquake is called the ______.
  • A seismic focus
  • B fault scarp
  • C epicentre
  • D core
9 Waves generated inside the earth's surface due to an earthquake are called ______.
  • A sound waves
  • B light waves
  • C seismic waves
  • D radio waves
10 The graphical record of the intensity of seismic waves is called a ______.
  • A seismograph
  • B seismogram
  • C sonogram
  • D echogram
11 The Richter scale is logarithmic, meaning a change of one unit corresponds to a ______ times change in energy.
  • A 2
  • B 5
  • C 10
  • D 100
12 An earthquake with a magnitude of 7 or more on the Richter scale is considered ______.
  • A mild
  • B moderate
  • C strong
  • D destructive
13 A seismograph works based on the principle of a ______.
  • A lever
  • B pulley
  • C vibrating pendulum
  • D spring
14 When an earthquake occurs, the freely suspended bob of the pendulum in a seismograph ______.
  • A shakes violently
  • B does not shake and remains in place
  • C swings wildly
  • D falls off
15 Which of the following is NOT a typical damaging effect of earthquakes mentioned in the text?
  • A Damage to buildings and roads
  • B Landslides
  • C Floods caused by river course changes
  • D Volcanic eruptions
16 Underground nuclear explosions can cause ______.
  • A heavy rainfall
  • B powerful vibrations and earthquakes
  • C magnetic storms
  • D acid rain
17 An earthquake under the ocean floor can generate powerful sea waves called ______.
  • A hurricanes
  • B typhoons
  • C tsunamis
  • D monsoons
18 Tsunamis can travel at speeds of about ______ km/h in deep water.
  • A 70-80
  • B 100-200
  • C 700-800
  • D 1000-1200
19 What can happen to sewer systems during an earthquake?
  • A They get cleaner
  • B They may burst open, releasing sewage
  • C They become more efficient
  • D They are unaffected
20 Earthquakes can cause ______ in hilly areas and mountains.
  • A droughts
  • B landslides
  • C floods
  • D blizzards
21 Communication systems can be disrupted by earthquakes due to ______.
  • A power surges
  • B uprooted electric poles and collapsed towers
  • C internet outages
  • D radio interference
22 A shallow earthquake has a focal depth of ______.
  • A more than 700 km
  • B 70-300 km
  • C 60-70 km
  • D less than 10 km
23 Intermediate earthquakes have a focal depth between ______ km.
  • A 0-60
  • B 60-70
  • C 70-300
  • D 300-700
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