UPSC Static Quiz – Geography : 13 September 2025

UPSC Static Quiz – Geography : 13 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 Match the following water bodies with their typical range of surface salinity. List-I (Water Body) List-II (Salinity in ppt) A. Open Ocean (Average) 1. > 40 B. Baltic Sea 2. 35 C. Red Sea 3. < 10 D. Great Salt Lake 4. > 150 Select the correct answer code: (a) A-2, B-3, C-1, D-4 (b) A-1, B-2, C-4, D-3 (c) A-2, B-1, C-3, D-4 (d) A-3, B-4, C-2, D-1 Correct Solution: A Open Ocean (Average) (A): The average salinity of the world’s oceans is approximately 35 parts per thousand (ppt), or 3.5%. While it varies geographically, this is the standard baseline figure. So, A matches with 2. Baltic Sea (B): Baltic Sea is a brackish sea with very low salinity due to high freshwater input and limited connection to the Atlantic. Its surface salinity is typically less than 10 ppt. So, B matches with 3. Red Sea (C): The Red Sea is known for its high salinity due to extreme evaporation and lack of freshwater input. Its salinity is consistently greater than 40 ppt. So, C matches with 1. Great Salt Lake (D): This is a terminal lake in an arid region, meaning water flows in but does not flow out; it only leaves through evaporation. This process has concentrated salts over thousands of years, making it a hypersaline lake. Its salinity is highly variable but is significantly higher than seawater, often ranging from 50 to 270 ppt, which is greater than 150 ppt on average in its main basin. So, D matches with 4. Incorrect Solution: A Open Ocean (Average) (A): The average salinity of the world’s oceans is approximately 35 parts per thousand (ppt), or 3.5%. While it varies geographically, this is the standard baseline figure. So, A matches with 2. Baltic Sea (B): Baltic Sea is a brackish sea with very low salinity due to high freshwater input and limited connection to the Atlantic. Its surface salinity is typically less than 10 ppt. So, B matches with 3. Red Sea (C): The Red Sea is known for its high salinity due to extreme evaporation and lack of freshwater input. Its salinity is consistently greater than 40 ppt. So, C matches with 1. Great Salt Lake (D): This is a terminal lake in an arid region, meaning water flows in but does not flow out; it only leaves through evaporation. This process has concentrated salts over thousands of years, making it a hypersaline lake. Its salinity is highly variable but is significantly higher than seawater, often ranging from 50 to 270 ppt, which is greater than 150 ppt on average in its main basin. So, D matches with 4.

#### 1. Question

Match the following water bodies with their typical range of surface salinity.

List-I (Water Body) | List-II (Salinity in ppt)

A. Open Ocean (Average) | 1. > 40

B. Baltic Sea | 2. 35

C. Red Sea | 3. < 10

D. Great Salt Lake | 4. > 150

Select the correct answer code:

• (a) A-2, B-3, C-1, D-4

• (b) A-1, B-2, C-4, D-3

• (c) A-2, B-1, C-3, D-4

• (d) A-3, B-4, C-2, D-1

Solution: A

• Open Ocean (Average) (A): The average salinity of the world’s oceans is approximately 35 parts per thousand (ppt), or 3.5%. While it varies geographically, this is the standard baseline figure. So, A matches with 2.

• Baltic Sea (B): Baltic Sea is a brackish sea with very low salinity due to high freshwater input and limited connection to the Atlantic. Its surface salinity is typically less than 10 ppt. So, B matches with 3.

• Red Sea (C): The Red Sea is known for its high salinity due to extreme evaporation and lack of freshwater input. Its salinity is consistently greater than 40 ppt. So, C matches with 1.

Great Salt Lake (D): This is a terminal lake in an arid region, meaning water flows in but does not flow out; it only leaves through evaporation. This process has concentrated salts over thousands of years, making it a hypersaline lake. Its salinity is highly variable but is significantly higher than seawater, often ranging from 50 to 270 ppt, which is greater than 150 ppt on average in its main basin. So, D matches with 4.

Solution: A

• Red Sea (C): The Red Sea is known for its high salinity due to extreme evaporation and lack of freshwater input. Its salinity is consistently greater than 40 ppt. So, C matches with 1.

• Question 2 of 5 2. Question The layer of ocean water where there is a rapid increase in salinity with increasing depth is known as the: (a) Thermocline (b) Pycnocline (c) Halocline (d) Isocline Correct Solution: C (a) Thermocline: This is the layer where there is a rapid change (specifically, a decrease) in temperature with depth. (b) Pycnocline: This is the layer where there is a rapid change in density with depth. The pycnocline is a result of the combined effects of the thermocline and the halocline, as both temperature and salinity influence water density. (c) Halocline: This is the correct term. The halocline is the layer in a body of water where there is a rapid change in salinity with depth. In low latitudes, where evaporation is high, salinity can decrease with depth. In high latitudes or areas with significant river runoff (like the mouth of the Amazon), low-salinity surface water may overlie saltier deep water, resulting in a halocline where salinity increases with depth. (d) Isocline: This is a general term used in mathematics and geology to denote a line connecting points of equal gradient or slope. It is not a standard term for a specific layer in oceanography. Therefore, the layer defined by a rapid change in salinity is the halocline. Incorrect Solution: C (a) Thermocline: This is the layer where there is a rapid change (specifically, a decrease) in temperature with depth. (b) Pycnocline: This is the layer where there is a rapid change in density with depth. The pycnocline is a result of the combined effects of the thermocline and the halocline, as both temperature and salinity influence water density. (c) Halocline: This is the correct term. The halocline is the layer in a body of water where there is a rapid change in salinity with depth. In low latitudes, where evaporation is high, salinity can decrease with depth. In high latitudes or areas with significant river runoff (like the mouth of the Amazon), low-salinity surface water may overlie saltier deep water, resulting in a halocline where salinity increases with depth. (d) Isocline: This is a general term used in mathematics and geology to denote a line connecting points of equal gradient or slope. It is not a standard term for a specific layer in oceanography. Therefore, the layer defined by a rapid change in salinity is the halocline.

#### 2. Question

The layer of ocean water where there is a rapid increase in salinity with increasing depth is known as the:

• (a) Thermocline

• (b) Pycnocline

• (c) Halocline

• (d) Isocline

Solution: C

• (a) Thermocline: This is the layer where there is a rapid change (specifically, a decrease) in temperature with depth.

• (b) Pycnocline: This is the layer where there is a rapid change in density with depth. The pycnocline is a result of the combined effects of the thermocline and the halocline, as both temperature and salinity influence water density.

• (c) Halocline: This is the correct term. The halocline is the layer in a body of water where there is a rapid change in salinity with depth. In low latitudes, where evaporation is high, salinity can decrease with depth. In high latitudes or areas with significant river runoff (like the mouth of the Amazon), low-salinity surface water may overlie saltier deep water, resulting in a halocline where salinity increases with depth.

(d) Isocline: This is a general term used in mathematics and geology to denote a line connecting points of equal gradient or slope. It is not a standard term for a specific layer in oceanography. Therefore, the layer defined by a rapid change in salinity is the halocline.

Solution: C

• (a) Thermocline: This is the layer where there is a rapid change (specifically, a decrease) in temperature with depth.

• Question 3 of 5 3. Question Consider the following statements regarding western coasts of continents in subtropical latitudes: Statement-I: The western coasts of continents in subtropical latitudes are some of the most productive fishing grounds in the world. Statement-II: Prevailing offshore winds in these regions drive surface water away from the coast, causing the upwelling of cold, nutrient-rich deep water. 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. Major commercial fisheries are concentrated in specific areas, and the western coasts of continents in the subtropics are prominent among them. Examples include the waters off the coasts of Peru and Chile (Humboldt Current system), California (California Current system), and Northwest Africa (Canary Current system). These regions have exceptionally high biological productivity despite being in otherwise oligotrophic (nutrient-poor) subtropical gyres. Statement-II is correct. In these regions, prevailing winds blowing parallel to the coast (e.g., trade winds) combine with the Coriolis effect to cause Ekman transport, which moves the surface layer of water offshore (away from the coast). To replace this displaced surface water, cold, deep water must rise to the surface. This deep water is rich in essential nutrients like nitrates and phosphates, which have accumulated from the decomposition of organic matter sinking from the surface. Statement-II provides the direct and fundamental explanation for Statement-I. Incorrect Solution: A Statement-I is correct. Major commercial fisheries are concentrated in specific areas, and the western coasts of continents in the subtropics are prominent among them. Examples include the waters off the coasts of Peru and Chile (Humboldt Current system), California (California Current system), and Northwest Africa (Canary Current system). These regions have exceptionally high biological productivity despite being in otherwise oligotrophic (nutrient-poor) subtropical gyres. Statement-II is correct. In these regions, prevailing winds blowing parallel to the coast (e.g., trade winds) combine with the Coriolis effect to cause Ekman transport, which moves the surface layer of water offshore (away from the coast). To replace this displaced surface water, cold, deep water must rise to the surface. This deep water is rich in essential nutrients like nitrates and phosphates, which have accumulated from the decomposition of organic matter sinking from the surface. Statement-II provides the direct and fundamental explanation for Statement-I.

#### 3. Question

Consider the following statements regarding western coasts of continents in subtropical latitudes:

Statement-I: The western coasts of continents in subtropical latitudes are some of the most productive fishing grounds in the world.

Statement-II: Prevailing offshore winds in these regions drive surface water away from the coast, causing the upwelling of cold, nutrient-rich deep water.

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. Major commercial fisheries are concentrated in specific areas, and the western coasts of continents in the subtropics are prominent among them. Examples include the waters off the coasts of Peru and Chile (Humboldt Current system), California (California Current system), and Northwest Africa (Canary Current system). These regions have exceptionally high biological productivity despite being in otherwise oligotrophic (nutrient-poor) subtropical gyres.

• Statement-II is correct. In these regions, prevailing winds blowing parallel to the coast (e.g., trade winds) combine with the Coriolis effect to cause Ekman transport, which moves the surface layer of water offshore (away from the coast). To replace this displaced surface water, cold, deep water must rise to the surface. This deep water is rich in essential nutrients like nitrates and phosphates, which have accumulated from the decomposition of organic matter sinking from the surface.

Statement-II provides the direct and fundamental explanation for Statement-I.

Solution: A

Statement-II provides the direct and fundamental explanation for Statement-I.

• Question 4 of 5 4. Question Consider the following statements: Statement-I: The highest salinity in the open ocean is generally found in the subtropical belts (around 20∘−30∘ N and S). Statement-II: The subtropical belts are characterized by high rates of evaporation and low precipitation, associated with descending air in the Hadley cells. 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. Contrary to what might be assumed, the highest sea surface salinity is not found at the equator, but in the subtropical regions. The Atlantic Ocean, in particular, exhibits high salinity in these belts, often exceeding 37 parts per thousand (ppt). Statement-II is correct. These regions correspond to the descending limbs of the Hadley cells, large-scale atmospheric convection cells. This descending air is dry and warms as it sinks, leading to the formation of the world’s major hot deserts on land and creating conditions of high atmospheric pressure, clear skies, and very low precipitation over the oceans. The intense solar radiation leads to high rates of evaporation. Statement-II provides the direct and complete explanation for Statement-I. Incorrect Solution: A Statement-I is correct. Contrary to what might be assumed, the highest sea surface salinity is not found at the equator, but in the subtropical regions. The Atlantic Ocean, in particular, exhibits high salinity in these belts, often exceeding 37 parts per thousand (ppt). Statement-II is correct. These regions correspond to the descending limbs of the Hadley cells, large-scale atmospheric convection cells. This descending air is dry and warms as it sinks, leading to the formation of the world’s major hot deserts on land and creating conditions of high atmospheric pressure, clear skies, and very low precipitation over the oceans. The intense solar radiation leads to high rates of evaporation. Statement-II provides the direct and complete explanation for Statement-I.

#### 4. Question

Consider the following statements:

Statement-I: The highest salinity in the open ocean is generally found in the subtropical belts (around 20∘−30∘ N and S).

Statement-II: The subtropical belts are characterized by high rates of evaporation and low precipitation, associated with descending air in the Hadley cells.

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. Contrary to what might be assumed, the highest sea surface salinity is not found at the equator, but in the subtropical regions. The Atlantic Ocean, in particular, exhibits high salinity in these belts, often exceeding 37 parts per thousand (ppt).

• Statement-II is correct. These regions correspond to the descending limbs of the Hadley cells, large-scale atmospheric convection cells. This descending air is dry and warms as it sinks, leading to the formation of the world’s major hot deserts on land and creating conditions of high atmospheric pressure, clear skies, and very low precipitation over the oceans. The intense solar radiation leads to high rates of evaporation.

Statement-II provides the direct and complete explanation for Statement-I.

Solution: A

Statement-II provides the direct and complete explanation for Statement-I.

• Question 5 of 5 5. Question Consider the following statements: Statement I: Laterite soils are generally infertile and unsuitable for intensive agriculture without significant amendments. Statement II: Laterite soils are formed under conditions of high temperature and heavy seasonal rainfall, leading to intense leaching of silica and essential bases. 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. Laterite soils, classified as Oxisols in the USDA system, are known for their low fertility. They are poor in essential plant nutrients like nitrogen, phosphorus, potassium, and calcium. While they can support certain plantation crops like tea, coffee, and cashew with heavy manuring and fertilization, they are not suitable for growing food crops like wheat or rice without substantial soil management. Statement II is correct. The formation of Laterite soils, a process known as laterization, occurs in tropical and subtropical regions with a distinct wet and dry season, high temperatures, and heavy rainfall. The intense rainfall leads to severe leaching, where water percolates through the soil, washing away soluble minerals and essential bases (like calcium, magnesium, potassium). Silica is also leached out, leaving behind a residual concentration of less soluble compounds, primarily iron and aluminum oxides (sesquioxides). These oxides are what give the soil its characteristic reddish-brown color. Statement II provides the precise scientific explanation for Statement I. Incorrect Solution: A Statement I is correct. Laterite soils, classified as Oxisols in the USDA system, are known for their low fertility. They are poor in essential plant nutrients like nitrogen, phosphorus, potassium, and calcium. While they can support certain plantation crops like tea, coffee, and cashew with heavy manuring and fertilization, they are not suitable for growing food crops like wheat or rice without substantial soil management. Statement II is correct. The formation of Laterite soils, a process known as laterization, occurs in tropical and subtropical regions with a distinct wet and dry season, high temperatures, and heavy rainfall. The intense rainfall leads to severe leaching, where water percolates through the soil, washing away soluble minerals and essential bases (like calcium, magnesium, potassium). Silica is also leached out, leaving behind a residual concentration of less soluble compounds, primarily iron and aluminum oxides (sesquioxides). These oxides are what give the soil its characteristic reddish-brown color. Statement II provides the precise scientific explanation for Statement I.

#### 5. Question

Consider the following statements:

Statement I: Laterite soils are generally infertile and unsuitable for intensive agriculture without significant amendments.

Statement II: Laterite soils are formed under conditions of high temperature and heavy seasonal rainfall, leading to intense leaching of silica and essential bases.

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. Laterite soils, classified as Oxisols in the USDA system, are known for their low fertility. They are poor in essential plant nutrients like nitrogen, phosphorus, potassium, and calcium. While they can support certain plantation crops like tea, coffee, and cashew with heavy manuring and fertilization, they are not suitable for growing food crops like wheat or rice without substantial soil management.

• Statement II is correct. The formation of Laterite soils, a process known as laterization, occurs in tropical and subtropical regions with a distinct wet and dry season, high temperatures, and heavy rainfall. The intense rainfall leads to severe leaching, where water percolates through the soil, washing away soluble minerals and essential bases (like calcium, magnesium, potassium). Silica is also leached out, leaving behind a residual concentration of less soluble compounds, primarily iron and aluminum oxides (sesquioxides). These oxides are what give the soil its characteristic reddish-brown color.

• Statement II provides the precise scientific explanation for Statement I.

Solution: A

• Statement II provides the precise scientific explanation for Statement I.

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