UPSC Static Quiz – Geography : 11 September 2025

UPSC Static Quiz – Geography : 11 September 2025 We will post 5 questions daily on static topics mentioned in the UPSC civil services preliminary examination syllabus. Each week will focus on a specific topic from the syllabus, such as History of India and Indian National Movement, Indian and World Geography, and more.We are excited to bring you our daily UPSC Static Quiz, designed to help you prepare for the UPSC Civil Services Preliminary Examination. Each day, we will post 5 questions on static topics mentioned in the UPSC syllabus. This week, we are focusing on Indian and World Geography.

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• Question 1 of 5 1. Question Consider the following statements: Statement-I: The Earth possesses a robust global magnetic field, known as the magnetosphere, which extends thousands of kilometers into space. Statement-II: The Earth’s outer core is a liquid layer composed primarily of iron and nickel, experiencing vigorous convection and influenced by the planet’s rotation. Which one of the following is correct in respect of the above statements? (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I (c) Statement-I is correct but Statement-II is incorrect (d) Statement-I is incorrect but Statement-II is correct Correct Solution: A Statement-I is correct; the Earth has a significant magnetosphere that protects the planet from solar wind. Statement-II is also correct and provides the precise mechanism for the generation of this field. The outer core’s composition of conductive metals (iron and nickel), its liquid state allowing for fluid motion, and the presence of convection currents driven by heat from the solid inner core create a self-sustaining electrical dynamo. The Coriolis effect, resulting from the Earth’s rotation, organizes these convection currents into spiral patterns, which generates and maintains the global magnetic field. Incorrect Solution: A Statement-I is correct; the Earth has a significant magnetosphere that protects the planet from solar wind. Statement-II is also correct and provides the precise mechanism for the generation of this field. The outer core’s composition of conductive metals (iron and nickel), its liquid state allowing for fluid motion, and the presence of convection currents driven by heat from the solid inner core create a self-sustaining electrical dynamo. The Coriolis effect, resulting from the Earth’s rotation, organizes these convection currents into spiral patterns, which generates and maintains the global magnetic field.

#### 1. Question

Consider the following statements:

Statement-I: The Earth possesses a robust global magnetic field, known as the magnetosphere, which extends thousands of kilometers into space.

Statement-II: The Earth’s outer core is a liquid layer composed primarily of iron and nickel, experiencing vigorous convection and influenced by the planet’s rotation.

Which one of the following is correct in respect of the above statements?

• (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I

• (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I

• (c) Statement-I is correct but Statement-II is incorrect

• (d) Statement-I is incorrect but Statement-II is correct

Solution: A

• Statement-I is correct; the Earth has a significant magnetosphere that protects the planet from solar wind.

Statement-II is also correct and provides the precise mechanism for the generation of this field. The outer core’s composition of conductive metals (iron and nickel), its liquid state allowing for fluid motion, and the presence of convection currents driven by heat from the solid inner core create a self-sustaining electrical dynamo. The Coriolis effect, resulting from the Earth’s rotation, organizes these convection currents into spiral patterns, which generates and maintains the global magnetic field.

Solution: A

• Statement-I is correct; the Earth has a significant magnetosphere that protects the planet from solar wind.

• Question 2 of 5 2. Question Consider the following statements regarding weathering processes: Hydrolysis is a chemical weathering process that involves the breakdown of minerals, such as feldspar in granite, into clay minerals through reaction with water. Exfoliation is a physical weathering process primarily caused by the repeated expansion and contraction of rock surfaces due to diurnal temperature changes. Carbonation, the dissolution of calcite in limestone by weakly acidic water, is most effective in cold, polar climates. How many of the above statements are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: B Statement 1 is correct. Hydrolysis is a key chemical weathering process where water molecules react with the chemical structure of rock-forming minerals. It is particularly effective on silicate minerals like feldspar, which is abundant in granite. The reaction transforms feldspar into kaolinite (a type of clay), weakening the rock’s structure and leading to granular disintegration. Statement 2 is correct. Exfoliation, also known as unloading or sheeting, is a physical weathering process where curved plates of rock are stripped from a larger rock mass. It is primarily caused by the release of confining pressure (unloading) when overlying rock is removed by erosion, allowing the underlying rock to expand and fracture in layers parallel to the surface. This process is responsible for creating large, dome-shaped landforms. While temperature changes can contribute, the primary driver is pressure release. Statement 3 is incorrect. Carbonation is the reaction between carbonic acid (formed when CO2 dissolves in water) and carbonate minerals like calcite (CaCO3) in limestone. While it is a crucial process, its rate is significantly influenced by temperature. Chemical reactions, including carbonation, generally proceed faster at higher temperatures. Therefore, carbonation is most effective in warm, humid climates, not cold, polar ones. Incorrect Solution: B Statement 1 is correct. Hydrolysis is a key chemical weathering process where water molecules react with the chemical structure of rock-forming minerals. It is particularly effective on silicate minerals like feldspar, which is abundant in granite. The reaction transforms feldspar into kaolinite (a type of clay), weakening the rock’s structure and leading to granular disintegration. Statement 2 is correct. Exfoliation, also known as unloading or sheeting, is a physical weathering process where curved plates of rock are stripped from a larger rock mass. It is primarily caused by the release of confining pressure (unloading) when overlying rock is removed by erosion, allowing the underlying rock to expand and fracture in layers parallel to the surface. This process is responsible for creating large, dome-shaped landforms. While temperature changes can contribute, the primary driver is pressure release. Statement 3 is incorrect. Carbonation is the reaction between carbonic acid (formed when CO2 dissolves in water) and carbonate minerals like calcite (CaCO3) in limestone. While it is a crucial process, its rate is significantly influenced by temperature. Chemical reactions, including carbonation, generally proceed faster at higher temperatures. Therefore, carbonation is most effective in warm, humid climates, not cold, polar ones.

#### 2. Question

Consider the following statements regarding weathering processes:

• Hydrolysis is a chemical weathering process that involves the breakdown of minerals, such as feldspar in granite, into clay minerals through reaction with water.

• Exfoliation is a physical weathering process primarily caused by the repeated expansion and contraction of rock surfaces due to diurnal temperature changes.

• Carbonation, the dissolution of calcite in limestone by weakly acidic water, is most effective in cold, polar climates.

How many of the above statements are correct?

• (a) Only one

• (b) Only two

• (c) All three

Solution: B

• Statement 1 is correct. Hydrolysis is a key chemical weathering process where water molecules react with the chemical structure of rock-forming minerals. It is particularly effective on silicate minerals like feldspar, which is abundant in granite. The reaction transforms feldspar into kaolinite (a type of clay), weakening the rock’s structure and leading to granular disintegration.

• Statement 2 is correct. Exfoliation, also known as unloading or sheeting, is a physical weathering process where curved plates of rock are stripped from a larger rock mass. It is primarily caused by the release of confining pressure (unloading) when overlying rock is removed by erosion, allowing the underlying rock to expand and fracture in layers parallel to the surface. This process is responsible for creating large, dome-shaped landforms. While temperature changes can contribute, the primary driver is pressure release.

• Statement 3 is incorrect. Carbonation is the reaction between carbonic acid (formed when CO2 dissolves in water) and carbonate minerals like calcite (CaCO3) in limestone. While it is a crucial process, its rate is significantly influenced by temperature. Chemical reactions, including carbonation, generally proceed faster at higher temperatures. Therefore, carbonation is most effective in warm, humid climates, not cold, polar ones.

Solution: B

• Question 3 of 5 3. Question Consider the following statements regarding seismic waves and the Earth’s interior: The velocity of P-waves increases abruptly at the Moho discontinuity. S-waves cannot propagate through the outer core, creating a large shadow zone covering nearly half the planet’s surface. P-waves are transverse waves, while S-waves are longitudinal waves. The Gutenberg discontinuity marks the boundary where the density of material decreases, causing P-waves to slow down. How many of the above statements are correct? (a) Only one (b) Only two (c) Only three (d) All four Correct Solution: C Statement 1 is correct. The Mohorovičić (Moho) discontinuity is the boundary between the crust and the mantle. The mantle is significantly denser than the crust, and as the velocity of seismic waves is directly proportional to the density of the medium, P-waves (and S-waves) experience a sharp increase in speed as they cross this boundary. Statement 2 is correct. S-waves can only travel through solid materials; they cannot be transmitted through liquids or gases. The outer core is liquid, so S-waves are stopped at the mantle-core boundary. This results in a vast “shadow zone” on the opposite side of the Earth from an earthquake’s focus, extending beyond 105° from the epicenter. This shadow zone is much larger than that of P-waves and covers over 40% of the Earth’s surface. Statement 3 is incorrect. P-waves (primary waves) are longitudinal or compressional, similar to sound waves, where particles oscillate parallel to the wave’s direction of propagation. S-waves (secondary waves) are transverse or shear waves, where particles oscillate perpendicular to the wave’s direction. Statement 4 is correct. The Gutenberg discontinuity separates the silicate mantle from the metallic outer core. The outer core is significantly denser than the mantle. However, it is liquid, which affects the rigidity and thus the speed of P-waves. P-waves slow down significantly upon entering the liquid outer core from the solid mantle, a change that is a key characteristic of this boundary. Incorrect Solution: C Statement 1 is correct. The Mohorovičić (Moho) discontinuity is the boundary between the crust and the mantle. The mantle is significantly denser than the crust, and as the velocity of seismic waves is directly proportional to the density of the medium, P-waves (and S-waves) experience a sharp increase in speed as they cross this boundary. Statement 2 is correct. S-waves can only travel through solid materials; they cannot be transmitted through liquids or gases. The outer core is liquid, so S-waves are stopped at the mantle-core boundary. This results in a vast “shadow zone” on the opposite side of the Earth from an earthquake’s focus, extending beyond 105° from the epicenter. This shadow zone is much larger than that of P-waves and covers over 40% of the Earth’s surface. Statement 3 is incorrect. P-waves (primary waves) are longitudinal or compressional, similar to sound waves, where particles oscillate parallel to the wave’s direction of propagation. S-waves (secondary waves) are transverse or shear waves, where particles oscillate perpendicular to the wave’s direction. Statement 4 is correct. The Gutenberg discontinuity separates the silicate mantle from the metallic outer core. The outer core is significantly denser than the mantle. However, it is liquid, which affects the rigidity and thus the speed of P-waves. P-waves slow down significantly upon entering the liquid outer core from the solid mantle, a change that is a key characteristic of this boundary.

#### 3. Question

Consider the following statements regarding seismic waves and the Earth’s interior:

• The velocity of P-waves increases abruptly at the Moho discontinuity.

• S-waves cannot propagate through the outer core, creating a large shadow zone covering nearly half the planet’s surface.

• P-waves are transverse waves, while S-waves are longitudinal waves.

• The Gutenberg discontinuity marks the boundary where the density of material decreases, causing P-waves to slow down.

How many of the above statements are correct?

• (a) Only one

• (b) Only two

• (c) Only three

• (d) All four

Solution: C

• Statement 1 is correct. The Mohorovičić (Moho) discontinuity is the boundary between the crust and the mantle. The mantle is significantly denser than the crust, and as the velocity of seismic waves is directly proportional to the density of the medium, P-waves (and S-waves) experience a sharp increase in speed as they cross this boundary.

• Statement 2 is correct. S-waves can only travel through solid materials; they cannot be transmitted through liquids or gases. The outer core is liquid, so S-waves are stopped at the mantle-core boundary. This results in a vast “shadow zone” on the opposite side of the Earth from an earthquake’s focus, extending beyond 105° from the epicenter. This shadow zone is much larger than that of P-waves and covers over 40% of the Earth’s surface.

• Statement 3 is incorrect. P-waves (primary waves) are longitudinal or compressional, similar to sound waves, where particles oscillate parallel to the wave’s direction of propagation. S-waves (secondary waves) are transverse or shear waves, where particles oscillate perpendicular to the wave’s direction.

• Statement 4 is correct. The Gutenberg discontinuity separates the silicate mantle from the metallic outer core. The outer core is significantly denser than the mantle. However, it is liquid, which affects the rigidity and thus the speed of P-waves. P-waves slow down significantly upon entering the liquid outer core from the solid mantle, a change that is a key characteristic of this boundary.

Solution: C

• Question 4 of 5 4. Question Consider the following statements: Statement I: The frequency and magnitude of mass wasting events, such as debris flows and landslides, are significantly higher in the Himalayan region compared to the Western Ghats. Statement II: The Himalayas are a young, tectonically active fold mountain range characterized by steep slopes and ongoing seismic activity. Statement III: The Western Ghats are a block mountain range of ancient origin, characterized by comparatively gentler slopes and composed largely of weathered basalt. Which one of the following is correct in respect of the above statements? (a) Both Statement II and Statement III are correct and both of them explain Statement I (b) Both Statement II and Statement III are correct but only one of them explains Statement I (c) Only one of the Statements II and III is correct and that explains Statement I (d) Neither Statement II nor Statement III is correct Correct Solution: A Statement I is a correct observation. The Himalayas are one of the most landslide-prone regions in the world due to a combination of geological and climatic factors. Statement II is correct. The Himalayas are the result of the ongoing collision between the Indian and Eurasian plates, making them tectonically and seismically active. This continuous uplift (an endogenic process) creates steep slopes and fractured rock, which are inherently unstable. This directly contributes to the conditions necessary for mass wasting, thus explaining Statement I. Statement III is also correct. The Western Ghats are an escarpment formed during the break-up of Gondwanaland. They are tectonically stable, older, and have undergone prolonged erosion, resulting in generally more rounded profiles compared to the rugged Himalayas. The Deccan basalt that forms much of the range is also susceptible to deep weathering. This geological stability and different morphology, in contrast to the Himalayas, explains the lower frequency of large-scale mass wasting events. Therefore, Statement III provides a crucial comparative context that also helps explain Statement I. Both statements II and III, by highlighting the contrasting geomorphic characteristics of the two regions, collectively provide a comprehensive explanation for the observation in Statement I. Incorrect Solution: A Statement I is a correct observation. The Himalayas are one of the most landslide-prone regions in the world due to a combination of geological and climatic factors. Statement II is correct. The Himalayas are the result of the ongoing collision between the Indian and Eurasian plates, making them tectonically and seismically active. This continuous uplift (an endogenic process) creates steep slopes and fractured rock, which are inherently unstable. This directly contributes to the conditions necessary for mass wasting, thus explaining Statement I. Statement III is also correct. The Western Ghats are an escarpment formed during the break-up of Gondwanaland. They are tectonically stable, older, and have undergone prolonged erosion, resulting in generally more rounded profiles compared to the rugged Himalayas. The Deccan basalt that forms much of the range is also susceptible to deep weathering. This geological stability and different morphology, in contrast to the Himalayas, explains the lower frequency of large-scale mass wasting events. Therefore, Statement III provides a crucial comparative context that also helps explain Statement I. Both statements II and III, by highlighting the contrasting geomorphic characteristics of the two regions, collectively provide a comprehensive explanation for the observation in Statement I.

#### 4. Question

Consider the following statements:

Statement I: The frequency and magnitude of mass wasting events, such as debris flows and landslides, are significantly higher in the Himalayan region compared to the Western Ghats.

Statement II: The Himalayas are a young, tectonically active fold mountain range characterized by steep slopes and ongoing seismic activity.

Statement III: The Western Ghats are a block mountain range of ancient origin, characterized by comparatively gentler slopes and composed largely of weathered basalt.

Which one of the following is correct in respect of the above statements?

• (a) Both Statement II and Statement III are correct and both of them explain Statement I

• (b) Both Statement II and Statement III are correct but only one of them explains Statement I

• (c) Only one of the Statements II and III is correct and that explains Statement I

• (d) Neither Statement II nor Statement III is correct

Solution: A

• Statement I is a correct observation. The Himalayas are one of the most landslide-prone regions in the world due to a combination of geological and climatic factors.

• Statement II is correct. The Himalayas are the result of the ongoing collision between the Indian and Eurasian plates, making them tectonically and seismically active. This continuous uplift (an endogenic process) creates steep slopes and fractured rock, which are inherently unstable. This directly contributes to the conditions necessary for mass wasting, thus explaining Statement I.

• Statement III is also correct. The Western Ghats are an escarpment formed during the break-up of Gondwanaland. They are tectonically stable, older, and have undergone prolonged erosion, resulting in generally more rounded profiles compared to the rugged Himalayas. The Deccan basalt that forms much of the range is also susceptible to deep weathering. This geological stability and different morphology, in contrast to the Himalayas, explains the lower frequency of large-scale mass wasting events.

• Therefore, Statement III provides a crucial comparative context that also helps explain Statement I. Both statements II and III, by highlighting the contrasting geomorphic characteristics of the two regions, collectively provide a comprehensive explanation for the observation in Statement I.

Solution: A

• Statement I is a correct observation. The Himalayas are one of the most landslide-prone regions in the world due to a combination of geological and climatic factors.

• Question 5 of 5 5. Question With reference to the Geological Time Scale, consider the following statements: The Cenozoic Era is often referred to as the “Age of Reptiles” due to the dominance of dinosaurs. The most severe mass extinction event known in Earth’s history, wiping out over 90% of marine species, occurred at the Permian-Triassic boundary. The first evidence of life on Earth, in the form of single-celled organisms, appeared during the Cambrian Period. How many of the above statements are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: A Statement 1 is incorrect. The Cenozoic Era (66 million years ago to present) is known as the “Age of Mammals.” The “Age of Reptiles” was the preceding Mesozoic Era, which included the Triassic, Jurassic, and Cretaceous periods, the time of the dinosaurs. Statement 2 is correct. The mass extinction at the end of the Cretaceous period, which killed the dinosaurs, is more famous, but the extinction event at the end of the Permian period (the Permian-Triassic extinction event, about 252 million years ago) was far more catastrophic. It is often called “The Great Dying” and resulted in the extinction of an estimated 96% of all marine species and 70% of terrestrial vertebrate species, making it the most severe extinction event on record. Statement 3 is incorrect. The Cambrian Period (starting around 541 million years ago) is known for the “Cambrian Explosion,” a rapid diversification of complex, multicellular life. However, the first evidence of life itself dates back much further into the Precambrian, with fossil evidence of single-celled organisms like stromatolites found in rocks as old as 3.5 to 3.8 billion years (during the Archean Eon). Incorrect Solution: A Statement 1 is incorrect. The Cenozoic Era (66 million years ago to present) is known as the “Age of Mammals.” The “Age of Reptiles” was the preceding Mesozoic Era, which included the Triassic, Jurassic, and Cretaceous periods, the time of the dinosaurs. Statement 2 is correct. The mass extinction at the end of the Cretaceous period, which killed the dinosaurs, is more famous, but the extinction event at the end of the Permian period (the Permian-Triassic extinction event, about 252 million years ago) was far more catastrophic. It is often called “The Great Dying” and resulted in the extinction of an estimated 96% of all marine species and 70% of terrestrial vertebrate species, making it the most severe extinction event on record. Statement 3 is incorrect. The Cambrian Period (starting around 541 million years ago) is known for the “Cambrian Explosion,” a rapid diversification of complex, multicellular life. However, the first evidence of life itself dates back much further into the Precambrian, with fossil evidence of single-celled organisms like stromatolites found in rocks as old as 3.5 to 3.8 billion years (during the Archean Eon).

#### 5. Question

With reference to the Geological Time Scale, consider the following statements:

• The Cenozoic Era is often referred to as the “Age of Reptiles” due to the dominance of dinosaurs.

• The most severe mass extinction event known in Earth’s history, wiping out over 90% of marine species, occurred at the Permian-Triassic boundary.

• The first evidence of life on Earth, in the form of single-celled organisms, appeared during the Cambrian Period.

How many of the above statements are correct?

• (a) Only one

• (b) Only two

• (c) All three

Solution: A

• Statement 1 is incorrect. The Cenozoic Era (66 million years ago to present) is known as the “Age of Mammals.” The “Age of Reptiles” was the preceding Mesozoic Era, which included the Triassic, Jurassic, and Cretaceous periods, the time of the dinosaurs.

• Statement 2 is correct. The mass extinction at the end of the Cretaceous period, which killed the dinosaurs, is more famous, but the extinction event at the end of the Permian period (the Permian-Triassic extinction event, about 252 million years ago) was far more catastrophic. It is often called “The Great Dying” and resulted in the extinction of an estimated 96% of all marine species and 70% of terrestrial vertebrate species, making it the most severe extinction event on record.

• Statement 3 is incorrect. The Cambrian Period (starting around 541 million years ago) is known for the “Cambrian Explosion,” a rapid diversification of complex, multicellular life. However, the first evidence of life itself dates back much further into the Precambrian, with fossil evidence of single-celled organisms like stromatolites found in rocks as old as 3.5 to 3.8 billion years (during the Archean Eon).

Solution: A

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