All Categories MCQs
Topic Notes: All Categories
General Description
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
70451
Which US state has the highest frequency of earthquakes?
Answer:
Alaska
Alaska is the most seismically active state in the US, though California is more densely populated and thus earthquakes there are more famous.
70452
A sudden displacement of the ocean floor during an earthquake is the primary cause of:
Answer:
Tsunami
Tsunamis are generated when the sea floor abruptly deforms and vertically displaces the overlying water column.
70453
The 2015 Gorkha earthquake devastated which mountainous country?
Answer:
Nepal
The 2015 earthquake struck near Kathmandu, Nepal, causing thousands of deaths and destroying historical sites.
70454
Which ancient device, invented by Zhang Heng, is considered the world's first seismoscope?
Answer:
The Houfeng Didong Yi
Zhang Heng's device (AD 132) dropped a bronze ball from a dragon's mouth into a toad's mouth to indicate the direction of an earthquake.
70455
On the Richter scale, an increase of one whole number (e.g., 5.0 to 6.0) represents a __-fold increase in wave amplitude.
Answer:
10
The Richter scale is logarithmic; an increase of 1 represents a 10-fold increase in amplitude (and roughly 32 times more energy).
70456
The 1989 Loma Prieta earthquake famously interrupted which major sporting event?
Answer:
The World Series
The 1989 Loma Prieta quake struck the San Francisco Bay Area just before Game 3 of the World Series between the Giants and the Athletics.
70457
A 'megathrust' earthquake occurs at which type of boundary?
Answer:
Convergent (Subduction Zone)
Megathrust earthquakes occur at subduction zones where one tectonic plate is forced underneath another. They are the most powerful earthquakes on the planet.
70458
Which type of building material is generally most dangerous in an earthquake (unreinforced)?
Answer:
Masonry / Brick
Unreinforced masonry (brick or stone) is very brittle and tends to crumble and collapse during shaking, posing a high risk.
70459
The 'shadow zone' for P-waves suggests that:
Answer:
The Earth has a liquid outer core
P-waves are refracted (bent) by the density difference at the core-mantle boundary, creating a shadow zone, which helps confirm the core's composition.
70460
Which major city was struck by the 'Great Kanto Earthquake' in 1923?
Answer:
Tokyo
The 1923 Great Kantō earthquake devastated Tokyo and Yokohama, causing massive fires.