Tag: earthquake and volcanoes

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Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

According to the plate tectonic theory, the crust of the earth is made up of series of ____________.

  1. plate

  2. movable plate

  3. stationary plate

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the theory of plate tectonics, the world has been divided into six major plates and several smaller movable plates. Each of the plates is composed of crust up to a depth of 100 km from the surface of the earth. Due to the forces at the earth's interior, these plates move.

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

The point on the earth's surface vertically above the focus of Earthquake is called ______.

  1. pericentre

  2. epicentre

  3. both a and b

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The epicenter of an earthquake  is the point on the earth's surface vertically above the focus. Maximum damage is caused at the epicenter. 

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

Identify the Man-made causes of Earthquake ______.

  1. Construction of dams

  2. Nuclear explosions

  3. Blasting rocks

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Following activities of humans can trigger an earthquake:

Building huge dams, Mining, Blasting of rocks, Nuclear explosions, hydraulic fracturing, large scale construction activities.
However, it needs to be understood that the shaking or the tremors caused due to these types of human activities might not be that significant.

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

P-waves of earthquake can pass through _________.

  1. solid, liquid, gas

  2. solid

  3. liquid

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

P- Waves or the primary waves are also known as longitudinal or compressional waves. It can pass through solid, liquid and gas. P- waves travel at the fastest speed through solid materials. Though these also pass through liquid and gaseous materials their speed is slowed down. 

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

S-waves of earthquake can only pass through ______________.

  1. Solids

  2. Liquids

  3. Gases

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

S-Waves or secondary waves are also called transverse or distortional waves. These are analogous to water ripples or light waves wherein the particles move at right angles to the rays. S- Wave cannot pass through liquid materials. It can only pass through solids.  

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

The violent eruption of _________ volcano between the islands of Sumatra and Java is considered as the most violent of volcanic eruptions in modern human history.

  1. Krakatoa

  2. Mali

  3. Indonasia

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Krakatoa is a volcanic island situated in the Sunda Strait between the islands of Java and Sumatra in the Indonesian province of Lampung. The name is also used for the surrounding island group comprising the remnants of a much larger island of three volcanic peaks which was obliterated in a cataclysmic 1883 eruption, unleashing huge tsunamis (killing more than 36,000 people) and destroying over two-thirds of the island. The explosion is considered to be the loudest sound ever heard in modern history, with reports of it being heard up to 4,800 km from its point of origin. The shock waves from the explosion were recorded on barographs worldwide for days afterward.

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

Anatomy of earthquake includes ______.

  1. P-waves

  2. S-waves

  3. T-waves

  4. All of these
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation
Multiple Answers
A. P-waves
B. S-waves

Two types of particle motion result in two types of body waves: Primary and Secondary waves.

Primary waves (P-waves) are compressional waves that are longitudinal in nature. P waves are pressure waves that travel faster than other waves through the earth to arrive at seismograph stations first, hence the name "Primary". These waves can travel through any type of material, including fluids, and can travel at nearly twice the speed of S waves. In air, they take the form of sound waves, hence they travel at the speed of sound.

Secondary waves (S-waves) are shear waves that are transverse in nature. Following an earthquake event, S-waves arrive at seismograph stations after the faster-moving P-waves and displace the ground perpendicular to the direction of propagation. Depending on the preoperational direction, the wave can take on different surface characteristics; for example, in the case of horizontally polarized S waves, the ground moves alternately to one side and then the other. S-waves can travel only through solids, as fluids (liquids and gases) do not support shear stresses

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

The point of origin of waves of earthquake is called as ________________.

  1. Seismic focus

  2. Seismic line

  3. Seismic centre

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Focus or Seismic Focus is also called the hypocenter of an earthquake. The vibrating waves travel away from the focus of the earthquake in all directions. The waves can be so powerful they will reach all parts of the Earth and cause it to vibrate like a tuning fork. The focus is the exact point inside the crust of the earth where the quake begins.

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

In 1906 San Andreas Fault of California gave rise to major earthquake because of __________.

  1. plate tectonic

  2. folding and faulting

  3. volcanic activity

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The San Andreas Fault is a transform plate boundary where the movement of tectonic plates causes folding and faulting of the Earth's crust, leading to earthquakes.

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

The vibration of earthquakes, last from a few seconds to several minutes, called as ______.

  1. duration

  2. period

  3. hour

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Duration is the vibration of earthquakes which can be felt by human beings that last from a few seconds to several minutes. Generally, the greater the intensity of the shocks, the longer they last. The average duration of shocks of sufficient intensity to produce much damage is perhaps from one to two minutes.