Tag: causes of earthquakes

Questions Related to causes of earthquakes

Seismic waves that vibrate perpendicular to the direction of their path.

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. Spread on the surface of the earth

  2. Travel through the solid as well as other parts of the earth

  3. Travel through the solid parts of the earth only

  4. None of the above

Show answer
Correct Option: C
Explanation:

Seismic waves that vibrate perpendicular to the direction of motion travel through the solid parts of earth only.

Earthquake is also known as :

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. nektons

  2. blusters

  3. temblors

  4. flickers

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Correct Option: C
Explanation:

An earthquake also known as a temblor, quake, tremor is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves.

Which of the following is/are true regarding Earthquake ?

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. It refers to shaking of the Earth.

  2. It occurs due to release of energy.

  3. It generates waves that travel in all direction.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Earth's crust is broken up into large pieces called tectonic plates. Tectonic plates are giant pieces of the Earth's crust that fit together and move around on the Earth's surface. Tectonic plates are constantly moving slowly, but sometimes friction between them causes them lock together and become unable to move. The rest of the plates carry on moving, which leads to increased pressure on the locked section. Eventually, the locked section succumbs to the pressure, and the plates move past each other rapidly. This movement causes a tectonic earthquake. The waves of released energy move through the Earth's crust in all direction and cause the shaking we feel at an earthquake site.

Which of the following Earth's plates is responsible for causing an earthquake?

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. The crust of the earth

  2. The mantle of the earth

  3. The inner core of the earth

  4. The outer core of the earth

Show answer
Correct Option: A
Explanation:

Most earthquakes are tectonic earthquakes, which happen when the large, thin plates of the Earth's crust called tectonic plates become stuck as they move past one another. They lock together, and pressure builds up. When they finally release, earthquakes occur.

Earthquake at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and its destructive energy at A and B can be compared as:

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. Tremor at B are two times that at place A

  2. Tremor at B are four times that at place A

  3. Tremor at B are 100 times that at place A

  4. Tremor at B are 1000 times that at place A

Show answer
Correct Option: C
Explanation:

As the magnitude records by seismograph at a place is more by 1, the magnitude of tremors will be 10 times more. Hence, the magnitude of tremors at 'B' are 100 times than at place 'A' since they differ by 2 in magnitude.

Name the scale on which the destructive energy of an earthquake is measured.

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. Temperature scale

  2. Vector scale

  3. Richter scale

  4. Energy scale

Show answer
Correct Option: C
Explanation:

The Richter magnitude scale was developed in 1935 by Charles F. Richter of the California Institute of Technology as a mathematical device to compare the size of earthquakes. The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included in the magnitude formula to compensate for the variation in the distance between the various seismographs and the epicenter of the earthquakes. On the Richter Scale, magnitude is expressed in whole numbers and decimal fractions. For example, a magnitude of 5.3 might be computed for a moderate earthquake, and a strong earthquake might be rated as magnitude 6.3. Because of the logarithmic basis of the scale, each whole number increase in magnitude represents a tenfold increase in measured amplitude; as an estimate of energy, each whole number step in the magnitude scale corresponds to the release of about 31 times more energy than the amount associated with the preceding whole number value.
The Richter scale has the readings from 1 to 10. The reading of magnitude 3 on the Richter scale would be recorded by a seismograph. If the Richter scale gives a reading of magnitude 3, then the earthquake is not likely to cause much damage. Generally, earthquake of magnitudes higher than 7 is considered destructive in nature.

Earthquake at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and its destructive energy at A and B can be compared as under:

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. Tremor at B is 2 times to that at place A

  2. Tremor at B is 4 times to that at place A

  3. Tremor at B is 100 times to that at place A

  4. Tremor at B is 1000 times to that at place A

Show answer
Correct Option: C
Explanation:

Richter scale is not a linear scale. It is a logarithmic scale. A difference in magnitude of $2$ implies a multiplication factor of $10^2 = 100$.

The first seismograph was invented in

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. Germany by Albert Einstein.

  2. China by zhang Heng.

  3. Germany by Emmy Noether.

  4. none of the above.

Show answer
Correct Option: B
Explanation:

A Chinese mathematician, named Zhang Heng, inverted and constructed the first seismograph in A.D. 132.

Earthquake at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and its destructive energy at A and B can be compared as under

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. tremor at B are two times that at place 'A'

  2. tremor at B are four times that at place 'A'

  3. tremor at B are 100 times that at place 'A'

  4. tremor at B are 1000 times that at place 'A'

Show answer
Correct Option: C

The earth shakes when _________ occurs. 

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. Tsunami

  2. Flood

  3. Earthquake

  4. Drought

Show answer
Correct Option: C
Explanation:

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake.