UPSC Static Quiz – Geography : 20 September 2025

UPSC Static Quiz – Geography : 20 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 Which one of the following is the most critical condition for the formation of a tropical cyclone that is generally absent in the formation of a temperate cyclone? (a) Presence of a strong Coriolis force. (b) A pre-existing weak low-pressure area or cyclonic circulation. (c) Upper-level atmospheric divergence above the sea level system. (d) A large and continuous supply of latent heat from a sea surface with a temperature exceeding 27∘C. Correct Solution: D Tropical cyclones are essentially thermal engines that derive their immense power from the latent heat of condensation. This process requires a large and continuous supply of warm, moist air. Such conditions are only met over vast stretches of warm ocean water where the sea surface temperature (SST) is above a threshold of approximately 27∘C (80∘F) through a significant depth. This high temperature provides the necessary heat and moisture to fuel the storm’s development and intensification. In contrast, temperate (or extra-tropical) cyclones are baroclinic systems. They derive their energy primarily from the temperature contrast between two different air masses (e.g., a cold polar air mass and a warm tropical air mass) along a front. They are not dependent on a warm sea surface for their energy. While Coriolis force (a), a pre-existing low (b), and upper-level divergence (c) are necessary for both types of cyclones to develop their characteristic rotation and structure, the fundamental energy source of a high SST is unique and indispensable to tropical cyclones, making it the most critical differentiating condition. Incorrect Solution: D Tropical cyclones are essentially thermal engines that derive their immense power from the latent heat of condensation. This process requires a large and continuous supply of warm, moist air. Such conditions are only met over vast stretches of warm ocean water where the sea surface temperature (SST) is above a threshold of approximately 27∘C (80∘F) through a significant depth. This high temperature provides the necessary heat and moisture to fuel the storm’s development and intensification. In contrast, temperate (or extra-tropical) cyclones are baroclinic systems. They derive their energy primarily from the temperature contrast between two different air masses (e.g., a cold polar air mass and a warm tropical air mass) along a front. They are not dependent on a warm sea surface for their energy. While Coriolis force (a), a pre-existing low (b), and upper-level divergence (c) are necessary for both types of cyclones to develop their characteristic rotation and structure, the fundamental energy source of a high SST is unique and indispensable to tropical cyclones, making it the most critical differentiating condition.

#### 1. Question

Which one of the following is the most critical condition for the formation of a tropical cyclone that is generally absent in the formation of a temperate cyclone?

• (a) Presence of a strong Coriolis force.

• (b) A pre-existing weak low-pressure area or cyclonic circulation.

• (c) Upper-level atmospheric divergence above the sea level system.

• (d) A large and continuous supply of latent heat from a sea surface with a temperature exceeding 27∘C.

Solution: D

• Tropical cyclones are essentially thermal engines that derive their immense power from the latent heat of condensation. This process requires a large and continuous supply of warm, moist air. Such conditions are only met over vast stretches of warm ocean water where the sea surface temperature (SST) is above a threshold of approximately 27∘C (80∘F) through a significant depth. This high temperature provides the necessary heat and moisture to fuel the storm’s development and intensification.

• In contrast, temperate (or extra-tropical) cyclones are baroclinic systems. They derive their energy primarily from the temperature contrast between two different air masses (e.g., a cold polar air mass and a warm tropical air mass) along a front. They are not dependent on a warm sea surface for their energy.

• While Coriolis force (a), a pre-existing low (b), and upper-level divergence (c) are necessary for both types of cyclones to develop their characteristic rotation and structure, the fundamental energy source of a high SST is unique and indispensable to tropical cyclones, making it the most critical differentiating condition.

Solution: D

• Question 2 of 5 2. Question Consider the following statements: In the Northern Hemisphere, surface winds in an anticyclone spiral outwards in a clockwise direction. Cyclones are associated with air convergence at the surface and divergence aloft, leading to cloud formation and precipitation. In the Southern Hemisphere, the direction of rotation in both cyclones and anticyclones is the reverse of that in the Northern Hemisphere. How many of the above statements are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: C Statement 1 is correct. An anticyclone is a high-pressure system. Due to the pressure gradient, air moves from the high-pressure center outwards. In the Northern Hemisphere, the Coriolis force deflects this outward-moving air to the right, resulting in a clockwise spiral. Statement 2 is correct. A cyclone is a low-pressure system. Surface winds converge towards the low-pressure center. This inflowing air is forced to rise. For this vertical column of rising air to be maintained, there must be divergence (spreading out) of air at the top of the column in the upper troposphere. The rising air cools adiabatically, leading to condensation, cloud formation, and precipitation. This entire mechanism is the reason cyclones are associated with unsettled and often stormy weather. Statement 3 is correct. The Coriolis effect, which dictates the direction of rotation, acts to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This causes a complete reversal of rotational patterns. Cyclones: Counter-clockwise in the North, Clockwise in the South. Anticyclones: Clockwise in the North, Counter-clockwise in the South. Therefore, the direction of rotation in both systems is indeed reversed in the Southern Hemisphere compared to the Northern Hemisphere. Since all three statements are correct, the correct answer is (d). Incorrect Solution: C Statement 1 is correct. An anticyclone is a high-pressure system. Due to the pressure gradient, air moves from the high-pressure center outwards. In the Northern Hemisphere, the Coriolis force deflects this outward-moving air to the right, resulting in a clockwise spiral. Statement 2 is correct. A cyclone is a low-pressure system. Surface winds converge towards the low-pressure center. This inflowing air is forced to rise. For this vertical column of rising air to be maintained, there must be divergence (spreading out) of air at the top of the column in the upper troposphere. The rising air cools adiabatically, leading to condensation, cloud formation, and precipitation. This entire mechanism is the reason cyclones are associated with unsettled and often stormy weather. Statement 3 is correct. The Coriolis effect, which dictates the direction of rotation, acts to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This causes a complete reversal of rotational patterns. Cyclones: Counter-clockwise in the North, Clockwise in the South. Anticyclones: Clockwise in the North, Counter-clockwise in the South. Therefore, the direction of rotation in both systems is indeed reversed in the Southern Hemisphere compared to the Northern Hemisphere. Since all three statements are correct, the correct answer is (d).

#### 2. Question

Consider the following statements:

• In the Northern Hemisphere, surface winds in an anticyclone spiral outwards in a clockwise direction.

• Cyclones are associated with air convergence at the surface and divergence aloft, leading to cloud formation and precipitation.

• In the Southern Hemisphere, the direction of rotation in both cyclones and anticyclones is the reverse of that in the Northern Hemisphere.

How many of the above statements are correct?

• (a) Only one

• (b) Only two

• (c) All three

Solution: C

Statement 1 is correct. An anticyclone is a high-pressure system. Due to the pressure gradient, air moves from the high-pressure center outwards. In the Northern Hemisphere, the Coriolis force deflects this outward-moving air to the right, resulting in a clockwise spiral.

Statement 2 is correct. A cyclone is a low-pressure system. Surface winds converge towards the low-pressure center. This inflowing air is forced to rise. For this vertical column of rising air to be maintained, there must be divergence (spreading out) of air at the top of the column in the upper troposphere. The rising air cools adiabatically, leading to condensation, cloud formation, and precipitation. This entire mechanism is the reason cyclones are associated with unsettled and often stormy weather.

Statement 3 is correct. The Coriolis effect, which dictates the direction of rotation, acts to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. This causes a complete reversal of rotational patterns.

• Cyclones: Counter-clockwise in the North, Clockwise in the South.

• Anticyclones: Clockwise in the North, Counter-clockwise in the South. Therefore, the direction of rotation in both systems is indeed reversed in the Southern Hemisphere compared to the Northern Hemisphere.

Since all three statements are correct, the correct answer is (d).

Solution: C

• Cyclones: Counter-clockwise in the North, Clockwise in the South.

Since all three statements are correct, the correct answer is (d).

• Question 3 of 5 3. Question Consider the following statements regarding the horizontal distribution of temperature in the oceans: The highest surface oceanic temperature is recorded at the equator. The oceans in the Northern Hemisphere record a relatively higher average annual temperature than in the Southern Hemisphere. The isotherms in the Northern Hemisphere are more irregular and closely spaced than in the Southern Hemisphere. The presence of cold ocean currents along the western coasts of continents in the tropics leads to a phenomenon called “thermal anomaly”. 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 incorrect. The highest surface oceanic temperatures are not found at the equator but slightly north of it. This is due to the influence of trade winds and the presence of the Intertropical Convergence Zone (ITCZ), which often lies north of the equator and is associated with significant cloud cover and precipitation, which reduces insolation at the equator. Statement 2 is correct. The Northern Hemisphere has a larger landmass compared to the Southern Hemisphere. Land heats up and cools down more quickly than water. Therefore, the oceans in the Northern Hemisphere receive more heat from the adjacent landmasses, resulting in a higher average annual temperature compared to the oceans in the Southern Hemisphere. Statement 3 is correct. Isotherms are lines connecting points of equal temperature. In the Northern Hemisphere, the presence of large landmasses and the irregular distribution of land and water lead to greater variations in temperature, causing the isotherms to be more irregular and closely spaced. In the Southern Hemisphere, the dominance of oceans results in a more uniform temperature distribution, and the isotherms are more regular and widely spaced. Statement 4 is correct. Cold ocean currents, such as the Peru Current off the coast of South America and the Benguela Current off the coast of Africa, flow along the western coasts of continents in tropical and subtropical regions. These currents bring cold water from higher latitudes, significantly lowering the surface temperature of the ocean in these areas compared to other regions at the same latitude. This temperature difference is known as a negative thermal anomaly. Incorrect Solution: C Statement 1 is incorrect. The highest surface oceanic temperatures are not found at the equator but slightly north of it. This is due to the influence of trade winds and the presence of the Intertropical Convergence Zone (ITCZ), which often lies north of the equator and is associated with significant cloud cover and precipitation, which reduces insolation at the equator. Statement 2 is correct. The Northern Hemisphere has a larger landmass compared to the Southern Hemisphere. Land heats up and cools down more quickly than water. Therefore, the oceans in the Northern Hemisphere receive more heat from the adjacent landmasses, resulting in a higher average annual temperature compared to the oceans in the Southern Hemisphere. Statement 3 is correct. Isotherms are lines connecting points of equal temperature. In the Northern Hemisphere, the presence of large landmasses and the irregular distribution of land and water lead to greater variations in temperature, causing the isotherms to be more irregular and closely spaced. In the Southern Hemisphere, the dominance of oceans results in a more uniform temperature distribution, and the isotherms are more regular and widely spaced. Statement 4 is correct. Cold ocean currents, such as the Peru Current off the coast of South America and the Benguela Current off the coast of Africa, flow along the western coasts of continents in tropical and subtropical regions. These currents bring cold water from higher latitudes, significantly lowering the surface temperature of the ocean in these areas compared to other regions at the same latitude. This temperature difference is known as a negative thermal anomaly.

#### 3. Question

Consider the following statements regarding the horizontal distribution of temperature in the oceans:

• The highest surface oceanic temperature is recorded at the equator.

• The oceans in the Northern Hemisphere record a relatively higher average annual temperature than in the Southern Hemisphere.

• The isotherms in the Northern Hemisphere are more irregular and closely spaced than in the Southern Hemisphere.

• The presence of cold ocean currents along the western coasts of continents in the tropics leads to a phenomenon called “thermal anomaly”.

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 incorrect. The highest surface oceanic temperatures are not found at the equator but slightly north of it. This is due to the influence of trade winds and the presence of the Intertropical Convergence Zone (ITCZ), which often lies north of the equator and is associated with significant cloud cover and precipitation, which reduces insolation at the equator.

• Statement 2 is correct. The Northern Hemisphere has a larger landmass compared to the Southern Hemisphere. Land heats up and cools down more quickly than water. Therefore, the oceans in the Northern Hemisphere receive more heat from the adjacent landmasses, resulting in a higher average annual temperature compared to the oceans in the Southern Hemisphere.

• Statement 3 is correct. Isotherms are lines connecting points of equal temperature. In the Northern Hemisphere, the presence of large landmasses and the irregular distribution of land and water lead to greater variations in temperature, causing the isotherms to be more irregular and closely spaced. In the Southern Hemisphere, the dominance of oceans results in a more uniform temperature distribution, and the isotherms are more regular and widely spaced.

• Statement 4 is correct. Cold ocean currents, such as the Peru Current off the coast of South America and the Benguela Current off the coast of Africa, flow along the western coasts of continents in tropical and subtropical regions. These currents bring cold water from higher latitudes, significantly lowering the surface temperature of the ocean in these areas compared to other regions at the same latitude. This temperature difference is known as a negative thermal anomaly.

Solution: C

• Question 4 of 5 4. Question Consider the following statements. Statement I: The salinity of the ocean surface water is higher in the subtropical regions than at the equator. Statement II: The subtropical regions are characterized by high rates of evaporation and low precipitation, while the equatorial region experiences high rainfall. 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 highest surface salinity in the open ocean is found in the subtropical regions (around 20°-30° N and S latitude). Statement II is also correct and provides the correct explanation for Statement I. The subtropical regions are dominated by high-pressure systems with subsiding air, leading to clear skies, high temperatures, and consequently high rates of evaporation. These regions are also characterized by low precipitation. This excess of evaporation over precipitation leads to a higher concentration of salts in the surface water. In contrast, the equatorial region, despite having high temperatures and high evaporation, also receives a large amount of rainfall throughout the year due to the Inter-Tropical Convergence Zone (ITCZ). This high precipitation dilutes the surface seawater, resulting in lower salinity compared to the subtropics. Therefore, the balance between evaporation and precipitation is the primary determinant of surface salinity in these regions. Incorrect Solution: A Statement I is correct. The highest surface salinity in the open ocean is found in the subtropical regions (around 20°-30° N and S latitude). Statement II is also correct and provides the correct explanation for Statement I. The subtropical regions are dominated by high-pressure systems with subsiding air, leading to clear skies, high temperatures, and consequently high rates of evaporation. These regions are also characterized by low precipitation. This excess of evaporation over precipitation leads to a higher concentration of salts in the surface water. In contrast, the equatorial region, despite having high temperatures and high evaporation, also receives a large amount of rainfall throughout the year due to the Inter-Tropical Convergence Zone (ITCZ). This high precipitation dilutes the surface seawater, resulting in lower salinity compared to the subtropics. Therefore, the balance between evaporation and precipitation is the primary determinant of surface salinity in these regions.

#### 4. Question

Consider the following statements.

Statement I: The salinity of the ocean surface water is higher in the subtropical regions than at the equator.

Statement II: The subtropical regions are characterized by high rates of evaporation and low precipitation, while the equatorial region experiences high rainfall.

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 highest surface salinity in the open ocean is found in the subtropical regions (around 20°-30° N and S latitude).

• Statement II is also correct and provides the correct explanation for Statement I. The subtropical regions are dominated by high-pressure systems with subsiding air, leading to clear skies, high temperatures, and consequently high rates of evaporation. These regions are also characterized by low precipitation. This excess of evaporation over precipitation leads to a higher concentration of salts in the surface water.

• In contrast, the equatorial region, despite having high temperatures and high evaporation, also receives a large amount of rainfall throughout the year due to the Inter-Tropical Convergence Zone (ITCZ). This high precipitation dilutes the surface seawater, resulting in lower salinity compared to the subtropics. Therefore, the balance between evaporation and precipitation is the primary determinant of surface salinity in these regions.

Solution: A

• Statement I is correct. The highest surface salinity in the open ocean is found in the subtropical regions (around 20°-30° N and S latitude).

• Question 5 of 5 5. Question Consider the following pairs: List I (Feature) List II (Ocean) List III (Significance) A. Mariana Trench 1. Pacific Ocean i. Deepest point on Earth B. Mid-Atlantic Ridge 2. Atlantic Ocean ii. Seafloor spreading C. Ninety East Ridge 3. Indian Ocean iii. Aseismic ridge Which of the above pairs is/are correctly matched? (a) A only (b) A and B only (c) B and C only (d) A, B and C Correct Solution: D Mariana Trench: This is the deepest oceanic trench on Earth, located in the western Pacific Ocean. It is indeed the deepest natural point on the planet. Its deepest part is known as the Challenger Deep. Mid-Atlantic Ridge: This is a prominent mid-ocean ridge in the Atlantic Ocean. It is a divergent plate boundary where the North American and Eurasian plates, and the South American and African plates are moving apart. This process of seafloor spreading results in the formation of new oceanic crust. Ninety East Ridge: This is a long, narrow, and aseismic (meaning it has very few earthquakes) ridge in the Indian Ocean. It is one of the longest linear features on the Earth’s surface. Its origin is linked to the movement of the Indian Plate over a hotspot. Incorrect Solution: D Mariana Trench: This is the deepest oceanic trench on Earth, located in the western Pacific Ocean. It is indeed the deepest natural point on the planet. Its deepest part is known as the Challenger Deep. Mid-Atlantic Ridge: This is a prominent mid-ocean ridge in the Atlantic Ocean. It is a divergent plate boundary where the North American and Eurasian plates, and the South American and African plates are moving apart. This process of seafloor spreading results in the formation of new oceanic crust. Ninety East Ridge: This is a long, narrow, and aseismic (meaning it has very few earthquakes) ridge in the Indian Ocean. It is one of the longest linear features on the Earth’s surface. Its origin is linked to the movement of the Indian Plate over a hotspot.

#### 5. Question

Consider the following pairs:

List I (Feature) | List II (Ocean) | List III (Significance)

A. Mariana Trench | 1. Pacific Ocean | i. Deepest point on Earth

B. Mid-Atlantic Ridge | 2. Atlantic Ocean | ii. Seafloor spreading

C. Ninety East Ridge | 3. Indian Ocean | iii. Aseismic ridge

Which of the above pairs is/are correctly matched?

• (a) A only

• (b) A and B only

• (c) B and C only

• (d) A, B and C

Solution: D

• Mariana Trench: This is the deepest oceanic trench on Earth, located in the western Pacific Ocean. It is indeed the deepest natural point on the planet. Its deepest part is known as the Challenger Deep.

• Mid-Atlantic Ridge: This is a prominent mid-ocean ridge in the Atlantic Ocean. It is a divergent plate boundary where the North American and Eurasian plates, and the South American and African plates are moving apart. This process of seafloor spreading results in the formation of new oceanic crust.

• Ninety East Ridge: This is a long, narrow, and aseismic (meaning it has very few earthquakes) ridge in the Indian Ocean. It is one of the longest linear features on the Earth’s surface. Its origin is linked to the movement of the Indian Plate over a hotspot.

Solution: D

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