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Test: Interior of Earth - SSC CGL MCQ


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10 Questions MCQ Test SSC CGL Tier 2 - Study Material, Online Tests, Previous Year - Test: Interior of Earth

Test: Interior of Earth for SSC CGL 2024 is part of SSC CGL Tier 2 - Study Material, Online Tests, Previous Year preparation. The Test: Interior of Earth questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: Interior of Earth MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Interior of Earth below.
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Test: Interior of Earth - Question 1

What is the primary reason for the increase in temperature within the Earth's interior?

Detailed Solution for Test: Interior of Earth - Question 1

The increase in temperature within the Earth's interior is primarily attributed to radioactive disintegration within rocks, external forces like gravitational pull, and chemical reactions. These factors collectively contribute to the rise in temperature as one descends into the Earth.

Test: Interior of Earth - Question 2

Which layer of the Earth is responsible for convection currents, leading to phenomena like continental drift and volcanic eruptions?

Detailed Solution for Test: Interior of Earth - Question 2
The mantle, particularly the asthenosphere within it, is responsible for convection currents that drive phenomena such as continental drift, earthquakes, and volcanic eruptions.
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Test: Interior of Earth - Question 3

Why are P-waves also known as primary waves?

Detailed Solution for Test: Interior of Earth - Question 3
P-waves, or primary waves, are named so because they are the fastest among seismic waves. Their speed allows them to be recorded first on seismographs during an earthquake, making them primary in terms of arrival time.
Test: Interior of Earth - Question 4
What causes the shadow zone of P-waves between 103° and 142° from the earthquake's epicentre?
Detailed Solution for Test: Interior of Earth - Question 4
The shadow zone of P-waves is a result of their refraction when passing through the transition between the semisolid mantle and the liquid outer core, causing them to be absent in this angular range.
Test: Interior of Earth - Question 5
What is the primary composition of the outer core of the Earth?
Detailed Solution for Test: Interior of Earth - Question 5
The outer core of the Earth is believed to be in a wholly liquid or semi-liquid state, and its primary composition includes dense metals like Nickel and Iron.
Test: Interior of Earth - Question 6
What is the main reason for the existence of the Earth's magnetic field?
Detailed Solution for Test: Interior of Earth - Question 6
The Earth's magnetic field is a result of electric currents generated by the rapid spinning of the Earth's molten outer core.
Test: Interior of Earth - Question 7
Why are S-waves not recorded in the entire zone beyond 103° from the earthquake's epicentre?
Detailed Solution for Test: Interior of Earth - Question 7
S-waves do not travel through liquids, and beyond 103° from the epicentre, the entire zone does not receive S-waves, indicating the presence of a liquid outer core.
Test: Interior of Earth - Question 8
What does the lithosphere represent in the Earth's structure?
Detailed Solution for Test: Interior of Earth - Question 8
The lithosphere is the strong, upper layer of the Earth, representing the tectonic plates involved in plate tectonics.
Test: Interior of Earth - Question 9
Which seismic waves are responsible for the most destruction during an earthquake?
Detailed Solution for Test: Interior of Earth - Question 9
Surface waves, also known as Love waves and Rayleigh waves, are the most destructive among earthquake waves due to their larger amplitude on the Earth's surface.
Test: Interior of Earth - Question 10

Which one of the following is a major plate?

Detailed Solution for Test: Interior of Earth - Question 10

Tectonic Plates:

  • A tectonic plate (also called a lithospheric plate) is a massive, irregularly-shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
  • A tectonic plate may be a continental plate or an oceanic plate, depending on which of the two occupies the larger portion of the plate.

The Major and Minor Plates: The Earth’s lithosphere is divided into seven major and some minor plates.

  • Young Fold Mountain ridges, oceanic trenches, and/or transform faults surround the major plates. These include:
    • The Antarctic (and the surrounding oceanic) plate. Hence, option 4 is correct.
    • The North American plate (with the western Atlantic floor separated from the South American plate along the Caribbean islands)
    • The South American plate (with the western Atlantic floor separated from the North American plate along the Caribbean islands)
    • The Pacific plate
    • The India-Australia-New Zealand plate
    • Africa with the eastern Atlantic floor plate
    • Eurasia and the adjacent oceanic plate
  • Some important minor plates include:
    • Cocos plate: Between Central America and the Pacific plate
    • Nazca plate: Between South America and the Pacific plate
    • Arabian plate: Mostly the Saudi Arabian landmass
    • Philippine plate: Between the Asiatic and Pacific plate
    • Caroline plate: Between the Philippine and Indian plates (North of New Guinea)
    • Fuji plate: North-east of Australia
    • Juan De Fuca plate: South-East of North American Plate.
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