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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

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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.

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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.

State whether the given statement is True or False :

The plates of the outermost layer of the Earth are always in continuous motion. 

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

  1. True

  2. False

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Correct Option: A
Explanation:

The outermost layer of the Earth is called as crust. It is not in one piece but fragmented. Each fragment is called as a plate. Such 7-8 major plates are present. Also, there are many minor plates. These plates are in continuous motion. When these plates brush past one another or a plate goes under another, it causes collision. This causes earthquake on the surface of the Earth. Earthquakes occur all the time around the world. But they are too small to be noticed. Major earthquakes are less frequent. Hence, given statement is true.

A Seismograph is a device that is used to measure the:

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

  1. thunderstorm

  2. earthquake

  3. lightining

  4. weather

Show answer
Correct Option: B
Explanation:

A seismograph is a device that measures and records the seismic waves moving through the earth post an earthquake.

What are seismic waves caused by?

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

  1. Volcanoes

  2. Traffic

  3. Earthquakes

  4. Heavy rain

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Correct Option: C
Explanation:

Seismic waves move through the Earth as the result of earthquakes.

The layer below the crust is called _______.
physics some natural phenomena seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. mantle

  2. plate

  3. outer core

  4. inner core

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Correct Option: A
Explanation:

The layer below the Earth's crust is known as mantle. This consists of magma.

The Earth's crust is fragmented and each fragment is known as:

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

  1. a spot

  2. a plate

  3. a valley

  4. none of the above

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Correct Option: B
Explanation:

The Earth's crust is not a huge single piece rather it is in many pieces or fragments. The fragments are called plates.

Storms, cyclones, earthquake, lightning etc. are ................ natural phenomena:

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

  1. constructive

  2. destructive

  3. simple

  4. complex

Show answer
Correct Option: B
Explanation:

Storms, cyclones, earthquakes and lightning are termed as natural calamities. These causes lot of damages to the properties and enviroments. Hence, they are destructive in nature.