Tag: structure of earth

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Questions Related to structure of earth

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

The epicenter is the point inside the earth where the earthquake originates

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.

The point within the earth along the rupturing geological fault where an earthquake originates is called the focus, or hypocenter. The point on the earth's surface directly above the focus is called the epicenter. Earthquake waves begin to radiate out from the focus and subsequently form along the fault rupture. 
Hence, the statement is false.

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

Earthquake and tsunamis are difficult to predict

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is A.

Earthquakes are caused by by shaking of the earth, strain building up in the tectonic plates, plates slipping along the fault lines, etc. and the Tsunamis can also be caused by volcanic eruptions, underwater detonations and even landslides.
Because we cant get deep enough into the Earth to see what happens before an earthquake or tsunami happens, therefore we cant predict when its coming.

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

A seismograph is a scale use for measuring the magnitudes of earthquakes

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.

Seismograph is an instrument that makes a record of seismic waves caused by an earthquake, explosion, or other Earth-shaking phenomenon. Seismographs are equipped with electromagnetic sensors that translate ground motions into electrical changes, which are processed and recorded by the instruments analog or digital circuits. A record produced by a seismograph on a display screen or paper printout is called a seismogram.
Hence, it is not a scale and the statement is false.

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

The term used to describe a fracture along the earth's crust is

  1. aftershock

  2. fault

  3. focus

  4. tremor
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.

The fracture along blocks of crust (tectonic plates) is called a fault or fault line.
A fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement along the fractures as a result of earth movement. Large faults within the Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes.

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

Choose the correct statement.

  1. 'P' waves are slower than 'S' waves.

  2. Both 'P' and 'S' waves have same speed.

  3. 'S' waves are slower than 'P' waves.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The P waves and the S waves are the waves that travel throughout the planet. The P waves are the compression waves that apply force in the direction of propagation whereas the S waves are shear waves that make the medium particle move perpendicular to their direction of motion.
The energy is less easily transmitted in the medium in the case of S waves. So, P waves travel faster.

Option $C$ is correct.
Multiple choice physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

Waves produced due to earthquakes are known as :

  1. seismic waves

  2. shock waves

  3. infrasonic waves

  4. destructive waves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion, which travel through the earth's layers.

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

Waves produced due to the earthquake are known as

  1. seismic waves

  2. shock waves

  3. infrasonic waves

  4. Tectonic waves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Seismic waves are the scientific term for waves produced by earthquakes. While shock waves describes their nature and many are infrasonic, seismic waves is the correct terminology used in seismology to describe waves that travel through Earth's layers.