UPSC Static Quiz – Geography : 9 May 2025

UPSC Static Quiz – Geography : 9 May 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 regarding the Mid-Atlantic Ridge (MAR): It is primarily formed by compressional forces leading to crustal folding. The age of the oceanic crust generally increases symmetrically away from the ridge axis. Hydrothermal vents, known as ‘black smokers’, are commonly found along the MAR, supporting unique chemosynthetic ecosystems. The MAR represents a convergent plate boundary where the North American and Eurasian plates collide. How many of the above statements are correct? (a) Only one (b) Only two (c) Only three (d) All four Correct Solution: b) Statement 1 is incorrect. The Mid-Atlantic Ridge is a divergent plate boundary where tectonic plates are moving apart. It is formed by tensional forces leading to seafloor spreading and volcanic activity, not compressional forces and folding. Statement 2 is correct. Seafloor spreading occurs at the MAR. New oceanic crust is formed at the ridge axis through volcanic activity. As the plates move apart, this new crust is carried away from the ridge. Therefore, the age of the oceanic crust increases with distance from the ridge axis, symmetrically on both sides. Statement 3 is correct. Hydrothermal vents are indeed common features along mid-ocean ridges like the MAR. Cold seawater seeps into cracks, gets heated by magma, dissolves minerals, and emerges as superheated water (‘black smokers’). These vents support unique ecosystems based on chemosynthesis, where microbes use chemicals like hydrogen sulfide as an energy source. Statement 4 is incorrect. The MAR is a divergent plate boundary, marking the separation of plates like the North American plate from the Eurasian plate, and the South American plate from the African plate. Convergent boundaries are where plates collide. Incorrect Solution: b) Statement 1 is incorrect. The Mid-Atlantic Ridge is a divergent plate boundary where tectonic plates are moving apart. It is formed by tensional forces leading to seafloor spreading and volcanic activity, not compressional forces and folding. Statement 2 is correct. Seafloor spreading occurs at the MAR. New oceanic crust is formed at the ridge axis through volcanic activity. As the plates move apart, this new crust is carried away from the ridge. Therefore, the age of the oceanic crust increases with distance from the ridge axis, symmetrically on both sides. Statement 3 is correct. Hydrothermal vents are indeed common features along mid-ocean ridges like the MAR. Cold seawater seeps into cracks, gets heated by magma, dissolves minerals, and emerges as superheated water (‘black smokers’). These vents support unique ecosystems based on chemosynthesis, where microbes use chemicals like hydrogen sulfide as an energy source. Statement 4 is incorrect. The MAR is a divergent plate boundary, marking the separation of plates like the North American plate from the Eurasian plate, and the South American plate from the African plate. Convergent boundaries are where plates collide.

#### 1. Question

Consider the following statements regarding the Mid-Atlantic Ridge (MAR):

• It is primarily formed by compressional forces leading to crustal folding.

• The age of the oceanic crust generally increases symmetrically away from the ridge axis.

• Hydrothermal vents, known as ‘black smokers’, are commonly found along the MAR, supporting unique chemosynthetic ecosystems.

• The MAR represents a convergent plate boundary where the North American and Eurasian plates collide.

How many of the above statements are correct?

• (a) Only one

• (b) Only two

• (c) Only three

• (d) All four

Solution: b)

• Statement 1 is incorrect. The Mid-Atlantic Ridge is a divergent plate boundary where tectonic plates are moving apart. It is formed by tensional forces leading to seafloor spreading and volcanic activity, not compressional forces and folding.

• Statement 2 is correct. Seafloor spreading occurs at the MAR. New oceanic crust is formed at the ridge axis through volcanic activity. As the plates move apart, this new crust is carried away from the ridge. Therefore, the age of the oceanic crust increases with distance from the ridge axis, symmetrically on both sides.

• Statement 3 is correct. Hydrothermal vents are indeed common features along mid-ocean ridges like the MAR. Cold seawater seeps into cracks, gets heated by magma, dissolves minerals, and emerges as superheated water (‘black smokers’). These vents support unique ecosystems based on chemosynthesis, where microbes use chemicals like hydrogen sulfide as an energy source.

• Statement 4 is incorrect. The MAR is a divergent plate boundary, marking the separation of plates like the North American plate from the Eurasian plate, and the South American plate from the African plate. Convergent boundaries are where plates collide.

Solution: b)

• Question 2 of 5 2. Question Consider the following statements. Statement-I: Tropical cyclones typically do not form very close to the equator (e.g., within 5 degrees latitude). Statement-II: The Coriolis force, which is essential for initiating the rotation required for cyclone development, is negligible at the equator and increases with latitude. 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 but 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. Observationally, tropical cyclones (hurricanes, typhoons) require certain conditions to form, including warm sea surface temperatures, atmospheric instability, and sufficient rotational force. They rarely form within about 5 degrees latitude of the equator. Statement-II is correct. The Coriolis force is an apparent force that acts on moving objects (like air) in a rotating frame of reference (like the Earth). It deflects objects to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. The magnitude of the Coriolis force is zero at the equator and increases towards the poles. This force is crucial for imparting the necessary spin to developing low-pressure systems, allowing them to organize into rotating tropical cyclones. Statement-II provides the primary reason for Statement-I. Without a significant Coriolis force near the equator, the converging air associated with a low-pressure disturbance cannot acquire the necessary rotation (vorticity) to develop into a structured tropical cyclone. Incorrect Solution: a) Statement-I is correct. Observationally, tropical cyclones (hurricanes, typhoons) require certain conditions to form, including warm sea surface temperatures, atmospheric instability, and sufficient rotational force. They rarely form within about 5 degrees latitude of the equator. Statement-II is correct. The Coriolis force is an apparent force that acts on moving objects (like air) in a rotating frame of reference (like the Earth). It deflects objects to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. The magnitude of the Coriolis force is zero at the equator and increases towards the poles. This force is crucial for imparting the necessary spin to developing low-pressure systems, allowing them to organize into rotating tropical cyclones. Statement-II provides the primary reason for Statement-I. Without a significant Coriolis force near the equator, the converging air associated with a low-pressure disturbance cannot acquire the necessary rotation (vorticity) to develop into a structured tropical cyclone.

#### 2. Question

Consider the following statements.

Statement-I: Tropical cyclones typically do not form very close to the equator (e.g., within 5 degrees latitude).

Statement-II: The Coriolis force, which is essential for initiating the rotation required for cyclone development, is negligible at the equator and increases with latitude.

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 but 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. Observationally, tropical cyclones (hurricanes, typhoons) require certain conditions to form, including warm sea surface temperatures, atmospheric instability, and sufficient rotational force. They rarely form within about 5 degrees latitude of the equator.

• Statement-II is correct. The Coriolis force is an apparent force that acts on moving objects (like air) in a rotating frame of reference (like the Earth). It deflects objects to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. The magnitude of the Coriolis force is zero at the equator and increases towards the poles. This force is crucial for imparting the necessary spin to developing low-pressure systems, allowing them to organize into rotating tropical cyclones.

• Statement-II provides the primary reason for Statement-I. Without a significant Coriolis force near the equator, the converging air associated with a low-pressure disturbance cannot acquire the necessary rotation (vorticity) to develop into a structured tropical cyclone.

Solution: a)

• Question 3 of 5 3. Question The ‘Ring of Fire’ is a zone of intense seismic and volcanic activity encircling the Pacific Ocean. Which of the following tectonic processes are primarily responsible for this activity? Seafloor spreading at mid-ocean ridges within the Pacific basin. Subduction of oceanic plates beneath continental plates along continental margins. Subduction of oceanic plates beneath other oceanic plates creating island arcs. Transform faulting along the edges of the Pacific Plate. Select the correct answer using the code given below: (a) 1 and 2 only (b) 2 and 3 only (c) 2, 3 and 4 only (d) 1, 2, 3 and 4 Correct Solution: c) Statement 1 is incorrect. While seafloor spreading occurs within the Pacific basin (e.g., East Pacific Rise), the ‘Ring of Fire’ specifically refers to the margins of the Pacific Ocean basin, which are dominated by convergence and transform boundaries, not the spreading centers within it. Statement 2 is correct. A major portion of the Ring of Fire involves oceanic plates (like the Pacific, Nazca, Cocos plates) subducting beneath continental plates (like the North American, South American plates). This leads to the formation of continental volcanic arcs (e.g., Andes, Cascades) and associated earthquakes. Statement 3 is correct. Another significant part of the Ring of Fire involves the convergence and subduction of one oceanic plate beneath another. This process forms deep ocean trenches and volcanic island arcs (e.g., Aleutian Islands, Mariana Islands, Japan, Philippines). Statement 4 is correct. Transform faults, where plates slide past each other horizontally, also form segments of the Ring of Fire’s boundary, such as the San Andreas Fault and the Alpine Fault in New Zealand. These are associated with significant seismic activity. Incorrect Solution: c) Statement 1 is incorrect. While seafloor spreading occurs within the Pacific basin (e.g., East Pacific Rise), the ‘Ring of Fire’ specifically refers to the margins of the Pacific Ocean basin, which are dominated by convergence and transform boundaries, not the spreading centers within it. Statement 2 is correct. A major portion of the Ring of Fire involves oceanic plates (like the Pacific, Nazca, Cocos plates) subducting beneath continental plates (like the North American, South American plates). This leads to the formation of continental volcanic arcs (e.g., Andes, Cascades) and associated earthquakes. Statement 3 is correct. Another significant part of the Ring of Fire involves the convergence and subduction of one oceanic plate beneath another. This process forms deep ocean trenches and volcanic island arcs (e.g., Aleutian Islands, Mariana Islands, Japan, Philippines). Statement 4 is correct. Transform faults, where plates slide past each other horizontally, also form segments of the Ring of Fire’s boundary, such as the San Andreas Fault and the Alpine Fault in New Zealand. These are associated with significant seismic activity.

#### 3. Question

The ‘Ring of Fire’ is a zone of intense seismic and volcanic activity encircling the Pacific Ocean. Which of the following tectonic processes are primarily responsible for this activity?

• Seafloor spreading at mid-ocean ridges within the Pacific basin.

• Subduction of oceanic plates beneath continental plates along continental margins.

• Subduction of oceanic plates beneath other oceanic plates creating island arcs.

• Transform faulting along the edges of the Pacific Plate.

Select the correct answer using the code given below:

• (a) 1 and 2 only

• (b) 2 and 3 only

• (c) 2, 3 and 4 only

• (d) 1, 2, 3 and 4

Solution: c)

• Statement 1 is incorrect. While seafloor spreading occurs within the Pacific basin (e.g., East Pacific Rise), the ‘Ring of Fire’ specifically refers to the margins of the Pacific Ocean basin, which are dominated by convergence and transform boundaries, not the spreading centers within it.

• Statement 2 is correct. A major portion of the Ring of Fire involves oceanic plates (like the Pacific, Nazca, Cocos plates) subducting beneath continental plates (like the North American, South American plates). This leads to the formation of continental volcanic arcs (e.g., Andes, Cascades) and associated earthquakes.

• Statement 3 is correct. Another significant part of the Ring of Fire involves the convergence and subduction of one oceanic plate beneath another. This process forms deep ocean trenches and volcanic island arcs (e.g., Aleutian Islands, Mariana Islands, Japan, Philippines).

• Statement 4 is correct. Transform faults, where plates slide past each other horizontally, also form segments of the Ring of Fire’s boundary, such as the San Andreas Fault and the Alpine Fault in New Zealand. These are associated with significant seismic activity.

Solution: c)

• Question 4 of 5 4. Question Consider the following statements. Statement-I: The velocity of ocean currents generally decreases with increasing depth. Statement-II: The primary driving forces for ocean currents, such as wind stress and solar heating, act predominantly on the surface layers of the ocean. 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 but 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. Surface ocean currents, primarily driven by wind, tend to be the fastest. The speed of the current generally decreases with depth as the direct influence of wind diminishes and frictional forces become more significant. Deep ocean currents associated with thermohaline circulation are typically much slower than surface currents. Statement-II is correct. Surface currents are mainly driven by the friction between wind and the ocean surface (wind stress). Solar heating primarily affects the surface layers, influencing temperature and density, which can contribute to currents but mainly drives the stratification and influences the thermohaline circulation which originates at the surface in specific regions. The direct, energetic driving forces are concentrated at or near the surface. Incorrect Solution: a) Statement-I is correct. Surface ocean currents, primarily driven by wind, tend to be the fastest. The speed of the current generally decreases with depth as the direct influence of wind diminishes and frictional forces become more significant. Deep ocean currents associated with thermohaline circulation are typically much slower than surface currents. Statement-II is correct. Surface currents are mainly driven by the friction between wind and the ocean surface (wind stress). Solar heating primarily affects the surface layers, influencing temperature and density, which can contribute to currents but mainly drives the stratification and influences the thermohaline circulation which originates at the surface in specific regions. The direct, energetic driving forces are concentrated at or near the surface.

#### 4. Question

Consider the following statements.

Statement-I: The velocity of ocean currents generally decreases with increasing depth.

Statement-II: The primary driving forces for ocean currents, such as wind stress and solar heating, act predominantly on the surface layers of the ocean.

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 but 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. Surface ocean currents, primarily driven by wind, tend to be the fastest. The speed of the current generally decreases with depth as the direct influence of wind diminishes and frictional forces become more significant. Deep ocean currents associated with thermohaline circulation are typically much slower than surface currents.

• Statement-II is correct. Surface currents are mainly driven by the friction between wind and the ocean surface (wind stress). Solar heating primarily affects the surface layers, influencing temperature and density, which can contribute to currents but mainly drives the stratification and influences the thermohaline circulation which originates at the surface in specific regions. The direct, energetic driving forces are concentrated at or near the surface.

Solution: a)

• Question 5 of 5 5. Question Consider the following statements: Statement-I: Recent years have witnessed increased variability in the Indian Summer Monsoon Rainfall (ISMR), leading to more frequent extreme rainfall events and prolonged dry spells within the season. Statement-II: The weakening correlation between ISMR and El Niño Southern Oscillation (ENSO) phenomena, potentially influenced by global warming and factors like the Indian Ocean Dipole (IOD), contributes significantly to the increased monsoon variability. 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 but 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. There is considerable scientific evidence and observation indicating increased intra-seasonal and inter-annual variability of the Indian Summer Monsoon, characterized by shifts in rainfall patterns, including more intense rainfall events concentrated over shorter periods and longer dry spells in between, impacting agriculture and water resources. Statement-II is also correct. While ENSO has traditionally been a major driver of ISMR variability (El Niño generally correlating with weaker monsoons), studies suggest this relationship might be weakening or becoming more complex. Factors like global warming altering atmospheric circulation patterns and the increasing influence of regional phenomena like the Indian Ocean Dipole (IOD) are recognized as contributing factors to the changing characteristics and increased variability of the monsoon. The interplay of these factors makes monsoon prediction more challenging and contributes to the observed variability mentioned in Statement-I. Statement-II provides a valid explanation for Statement-I. Incorrect Solution: a) Statement-I is correct. There is considerable scientific evidence and observation indicating increased intra-seasonal and inter-annual variability of the Indian Summer Monsoon, characterized by shifts in rainfall patterns, including more intense rainfall events concentrated over shorter periods and longer dry spells in between, impacting agriculture and water resources. Statement-II is also correct. While ENSO has traditionally been a major driver of ISMR variability (El Niño generally correlating with weaker monsoons), studies suggest this relationship might be weakening or becoming more complex. Factors like global warming altering atmospheric circulation patterns and the increasing influence of regional phenomena like the Indian Ocean Dipole (IOD) are recognized as contributing factors to the changing characteristics and increased variability of the monsoon. The interplay of these factors makes monsoon prediction more challenging and contributes to the observed variability mentioned in Statement-I. Statement-II provides a valid explanation for Statement-I.

#### 5. Question

Consider the following statements:

Statement-I: Recent years have witnessed increased variability in the Indian Summer Monsoon Rainfall (ISMR), leading to more frequent extreme rainfall events and prolonged dry spells within the season.

Statement-II: The weakening correlation between ISMR and El Niño Southern Oscillation (ENSO) phenomena, potentially influenced by global warming and factors like the Indian Ocean Dipole (IOD), contributes significantly to the increased monsoon variability.

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 but 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. There is considerable scientific evidence and observation indicating increased intra-seasonal and inter-annual variability of the Indian Summer Monsoon, characterized by shifts in rainfall patterns, including more intense rainfall events concentrated over shorter periods and longer dry spells in between, impacting agriculture and water resources.

• Statement-II is also correct. While ENSO has traditionally been a major driver of ISMR variability (El Niño generally correlating with weaker monsoons), studies suggest this relationship might be weakening or becoming more complex. Factors like global warming altering atmospheric circulation patterns and the increasing influence of regional phenomena like the Indian Ocean Dipole (IOD) are recognized as contributing factors to the changing characteristics and increased variability of the monsoon. The interplay of these factors makes monsoon prediction more challenging and contributes to the observed variability mentioned in Statement-I.

• Statement-II provides a valid explanation for Statement-I.

Solution: a)

• Statement-II provides a valid explanation for Statement-I.

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