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
70431
What is the 'Ring of Fire' known for?
Answer:
Circum-Pacific seismic belt
The 'Ring of Fire' is a major area in the Pacific Ocean basin where about 75% of the world’s active volcanoes and 90% of earthquakes occur due to tectonic plate boundaries. It stretches from South America to Asia.
70432
Which scale is used to measure the magnitude of an earthquake?
Answer:
Richter scale
The Richter scale measures the magnitude of an earthquake based on the energy released at its source. It uses a logarithmic scale, where each whole number increase represents a tenfold increase in amplitude.
70433
What is the primary source of destruction during an earthquake?
Answer:
Seismic waves
Seismic waves, generated by the sudden release of energy in Earth’s crust, cause the ground shaking responsible for most earthquake destruction. These waves can collapse buildings, trigger landslides, and cause widespread damage.
70434
What instrument is primarily used to study earthquake activity?
Answer:
Seismograph
A seismograph is a device used to detect and record seismic waves caused by earthquakes. It measures the intensity, duration, and location of seismic activity, helping scientists analyze earthquake characteristics and predict potential impacts.
70435
Which seismic waves, characterized by transverse motion, are associated with earthquakes?
Answer:
Secondary waves
Secondary waves (S-waves) are seismic waves with transverse motion, moving perpendicular to the direction of propagation. Unlike Primary waves, they cannot travel through liquids, making them crucial for studying Earth’s internal structure. They are responsible for significant ground shaking during earthquakes.
70436
The rupture length of the 2004 Sumatra earthquake was approximately:
Answer:
1,300 km
The fault ruptured over a massive length of roughly 1,300 km (800 miles), contributing to the massive tsunami generation.
70437
An earthquake occurring at a depth of 400km is considered:
Answer:
Deep focus
Deep-focus earthquakes occur at depths between 300 and 700 km.
70438
The scale that replaced the Richter scale for communicating the size of earthquakes to the public in many countries is:
Answer:
Moment Magnitude
While the media often still says 'Richter', seismologists almost exclusively use Moment Magnitude (Mw) for significant quakes.
70439
Love waves cause the ground to move:
Answer:
Side-to-side (horizontally)
Love waves cause horizontal shifting of the earth during an earthquake and are faster than Rayleigh waves.
70440
The 1886 earthquake in Charleston is notable because:
Answer:
It was the largest East Coast (USA) earthquake
The Charleston earthquake is the most damaging earthquake to occur in the Southeastern United States.