Plate Tectonics Solved MCQs for PMS General Science
Plate tectonics is a scientific theory that explains how the Earth’s crust is made up of large plates that move and interact with each other. This theory has revolutionized the field of geology and has helped scientists understand various geological phenomena, including earthquakes, volcanoes, and mountain formation.
This set of multiple-choice questions (MCQs) is designed to test your knowledge and understanding of plate tectonics. The questions cover various aspects of plate tectonics, including the types of plate boundaries, the movements of tectonic plates, and the geological features associated with plate tectonics. These questions are specifically targeted towards the PMS (Provincial Management Service) General Science Paper. By taking these MCQs, you can assess your knowledge and identify areas where you may need further study.
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PMS GSA Plate Tectonics Solved MCQs
When was the concept of plate tectonics first formulated?
What is the typical rate of movement between the tectonic plates?
- 1 to 10 cm (0.4 to 4 inches) per year
- 11 to 20 cm (4 to 8 inches) per year
- 1 cm (0.4 inches) per year
- 20 to 30 cm (8 to 12 inches) per year
Answer: 1 to 10 cm (0.4 to 4 inches) per year
On what scale do tectonic plates move relative to each other?
- 4 to 4 meters per year
- 1 to 10 cm per year
- 1 to 10 m per year
- 10 to 100 cm per year
Answer: 1 to 10 cm per year
What is the mechanism by which tectonic plates move?
- Convection within Earth’s mantle.
- Plate drift
- Subduction of smaller plates
Answer: Convection within Earth’s mantle.
How are tectonic plates thought to move?
- By the equal number of major and intermediate-sized plates.
- By subduction of smaller plates.
- By a dozen smaller plates.
- By convection within Earth’s mantle.
Answer: By convection within Earth’s mantle.
How is the mantle heated?
- By the breakdown of radioactive isotopes.
- By the lithosphere
- By the Suns heat
- By convection
Answer: By the breakdown of radioactive isotopes.
What causes convection in the Earth’s mantle?
- The transfer of stresses to the lithosphere
- The rotation of the Earth
- Internal heat
- The breakdown of radioactive isotopes
Answer: The breakdown of radioactive isotopes
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What is the lithosphere?
- The convection cells in a boiling pan of thick soup
- The outer layer of Earth
- The interaction between plates
- The movement of plates relative to one another
Answer: The outer layer of the Earth
What type of plate boundary is formed when magma from the asthenosphere wells up in the opening between plates?
- Lateral Boundaries
- Divergent Boundaries
- Convergent Boundaries
- Transform Boundaries
Answer: Divergent Boundaries
What type of rock is solidifying at a divergent boundary?
- Basaltic lava
Which of the following is true regarding divergent boundaries?
- They are associated with shallow-focus earthquakes, volcanic activity, and hydrothermal metamorphism.
- They provide a place for sedimentary deposits to form.
- They are associated with deep-focus earthquakes.
- They are considered destructive.
Answer: They are associated with shallow-focus earthquakes, volcanic activity, and hydrothermal metamorphism.
What type of boundary does the Great East African Rift Valley represent?
- Convergent Boundary
- Transform Boundary
- Divergent Boundary
- Subduction Zone
Answer: Divergent Boundary
Which type of convergent boundary is responsible for major mountain ranges and volcanoes?
- Constructive Boundaries
- Continental-Continental Convergence
- Oceanic-Continental Convergence
- Oceanic-Oceanic Convergence
Answer: Oceanic-Continental Convergence
Why does the oceanic lithosphere sink into the asthenosphere?
- The slab pulls on the rest of the plate.
- Its temperature is higher than that of the asthenosphere.
- It is pulled down by gravity.
- It is denser than continental lithosphere.
Answer: It is denser than continental lithosphere.
What is the main cause of plate movement?
- Spreading ridges
- Slab pull
- Accretionary wedges
- Hot spots
Answer: Slab pull
What forms when an oceanic-continental convergent boundary exists?
- Subducting plate
- A mountain range
- Oceanic trench
Answer: A mountain range
What is the result of the collision between two continental plates?
- The formation of huge mountain ranges
- Volcanic eruption
- Ocean formation
Answer: The formation of huge mountain ranges
What type of tectonic activity occurs when two plates move past one another?
- Regional Metamorphism
- Transform Boundaries
Answer: Transform Boundaries
What type of tectonic boundary is associated with transform faults?
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