UPSC Static Quiz – Geography : 16 September 2025

UPSC Static Quiz – Geography : 16 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 With reference to marine energy resources, consider the following statements: Tidal energy generation is most efficient in areas with a large tidal range, typically found in narrow bays and estuaries. Ocean Thermal Energy Conversion (OTEC) harnesses the kinetic energy of large-scale ocean currents like the Gulf Stream. Wave energy converters are designed to capture energy primarily from the orbital motion of water particles in deep-water waves. 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 correct. Tidal energy technologies, particularly tidal barrages, rely on creating a head of water (a difference in water level) between a basin and the sea. This requires a large tidal range (the vertical difference between high and low tide). Such large ranges are often amplified by the local geography of funnel-shaped bays and estuaries, such as the Bay of Fundy in Canada or the Severn Estuary in the UK, which are prime locations for potential tidal power generation. Statement 2 is incorrect. Ocean Thermal Energy Conversion (OTEC) does not harness kinetic energy. Instead, it exploits the thermal gradient (temperature difference) between warm surface waters and cold deep waters. A working fluid with a low boiling point is used to drive a turbine, with the warm water vaporizing it and the cold water condensing it. OTEC is feasible in tropical regions where this temperature difference is significant. Harnessing the kinetic energy of currents would be a different technology, often referred to as in-stream tidal or ocean current energy conversion. Statement 3 is incorrect. While wave energy is derived from the motion of water particles, most practical wave energy converter designs are deployed in near-shore or offshore environments, not necessarily deep water, and they capture energy through various mechanisms. Some use the heaving (up-and-down) motion, some use the surging (back-and-forth) motion, and others use pressure fluctuations below the surface. The core principle is capturing energy from the wave’s surface motion or pressure, which is most pronounced near the surface. Incorrect Solution: A Statement 1 is correct. Tidal energy technologies, particularly tidal barrages, rely on creating a head of water (a difference in water level) between a basin and the sea. This requires a large tidal range (the vertical difference between high and low tide). Such large ranges are often amplified by the local geography of funnel-shaped bays and estuaries, such as the Bay of Fundy in Canada or the Severn Estuary in the UK, which are prime locations for potential tidal power generation. Statement 2 is incorrect. Ocean Thermal Energy Conversion (OTEC) does not harness kinetic energy. Instead, it exploits the thermal gradient (temperature difference) between warm surface waters and cold deep waters. A working fluid with a low boiling point is used to drive a turbine, with the warm water vaporizing it and the cold water condensing it. OTEC is feasible in tropical regions where this temperature difference is significant. Harnessing the kinetic energy of currents would be a different technology, often referred to as in-stream tidal or ocean current energy conversion. Statement 3 is incorrect. While wave energy is derived from the motion of water particles, most practical wave energy converter designs are deployed in near-shore or offshore environments, not necessarily deep water, and they capture energy through various mechanisms. Some use the heaving (up-and-down) motion, some use the surging (back-and-forth) motion, and others use pressure fluctuations below the surface. The core principle is capturing energy from the wave’s surface motion or pressure, which is most pronounced near the surface.

#### 1. Question

With reference to marine energy resources, consider the following statements:

• Tidal energy generation is most efficient in areas with a large tidal range, typically found in narrow bays and estuaries.

• Ocean Thermal Energy Conversion (OTEC) harnesses the kinetic energy of large-scale ocean currents like the Gulf Stream.

• Wave energy converters are designed to capture energy primarily from the orbital motion of water particles in deep-water waves.

How many of the above statements are correct?

• (a) Only one

• (b) Only two

• (c) All three

Solution: A

• Statement 1 is correct. Tidal energy technologies, particularly tidal barrages, rely on creating a head of water (a difference in water level) between a basin and the sea. This requires a large tidal range (the vertical difference between high and low tide). Such large ranges are often amplified by the local geography of funnel-shaped bays and estuaries, such as the Bay of Fundy in Canada or the Severn Estuary in the UK, which are prime locations for potential tidal power generation.

• Statement 2 is incorrect. Ocean Thermal Energy Conversion (OTEC) does not harness kinetic energy. Instead, it exploits the thermal gradient (temperature difference) between warm surface waters and cold deep waters. A working fluid with a low boiling point is used to drive a turbine, with the warm water vaporizing it and the cold water condensing it. OTEC is feasible in tropical regions where this temperature difference is significant. Harnessing the kinetic energy of currents would be a different technology, often referred to as in-stream tidal or ocean current energy conversion.

Statement 3 is incorrect. While wave energy is derived from the motion of water particles, most practical wave energy converter designs are deployed in near-shore or offshore environments, not necessarily deep water, and they capture energy through various mechanisms. Some use the heaving (up-and-down) motion, some use the surging (back-and-forth) motion, and others use pressure fluctuations below the surface. The core principle is capturing energy from the wave’s surface motion or pressure, which is most pronounced near the surface.

Solution: A

• Question 2 of 5 2. Question The primary factor limiting biological productivity in the vast majority of the open ocean (pelagic zone) is the: (a) availability of sunlight (b) low water temperature (c) scarcity of essential nutrients (d) high hydrostatic pressure Correct Solution: C (a) Availability of sunlight is a limiting factor, but only with depth. The upper layer of the ocean, known as the photic or euphotic zone (typically the top 100-200 meters), receives ample sunlight for photosynthesis. The vast surface area of the open ocean is well-lit. So, while sunlight limits life in the deep ocean, it is not the primary limiting factor for productivity at the surface of the open ocean. (b) Low water temperature is not the primary limiting factor in most of the ocean. While temperature affects metabolic rates, phytoplankton can thrive in a wide range of temperatures, from tropical to polar waters. In fact, some of the most productive ocean regions are in cold, high-latitude waters. (c) Scarcity of essential nutrients is the correct answer. The open ocean is often described as a “biological desert.” This is because the sunlit surface waters are strongly stratified and do not mix well with the cold, nutrient-rich waters below. As phytoplankton grow, they consume the available nutrients (like nitrates, phosphates, and silicates). When these organisms die, they sink out of the photic zone, taking the nutrients with them. Without a mechanism like upwelling to bring these nutrients back to the surface, productivity is severely limited. This is the key reason why coastal upwelling zones are so much more productive than the open ocean. (d) High hydrostatic pressure is a characteristic of the deep ocean. It is a major physiological challenge for organisms living there, but it is not a factor that limits productivity in the sunlit surface layers where photosynthesis occurs. Incorrect Solution: C (a) Availability of sunlight is a limiting factor, but only with depth. The upper layer of the ocean, known as the photic or euphotic zone (typically the top 100-200 meters), receives ample sunlight for photosynthesis. The vast surface area of the open ocean is well-lit. So, while sunlight limits life in the deep ocean, it is not the primary limiting factor for productivity at the surface of the open ocean. (b) Low water temperature is not the primary limiting factor in most of the ocean. While temperature affects metabolic rates, phytoplankton can thrive in a wide range of temperatures, from tropical to polar waters. In fact, some of the most productive ocean regions are in cold, high-latitude waters. (c) Scarcity of essential nutrients is the correct answer. The open ocean is often described as a “biological desert.” This is because the sunlit surface waters are strongly stratified and do not mix well with the cold, nutrient-rich waters below. As phytoplankton grow, they consume the available nutrients (like nitrates, phosphates, and silicates). When these organisms die, they sink out of the photic zone, taking the nutrients with them. Without a mechanism like upwelling to bring these nutrients back to the surface, productivity is severely limited. This is the key reason why coastal upwelling zones are so much more productive than the open ocean. (d) High hydrostatic pressure is a characteristic of the deep ocean. It is a major physiological challenge for organisms living there, but it is not a factor that limits productivity in the sunlit surface layers where photosynthesis occurs.

#### 2. Question

The primary factor limiting biological productivity in the vast majority of the open ocean (pelagic zone) is the:

• (a) availability of sunlight

• (b) low water temperature

• (c) scarcity of essential nutrients

• (d) high hydrostatic pressure

Solution: C

• (a) Availability of sunlight is a limiting factor, but only with depth. The upper layer of the ocean, known as the photic or euphotic zone (typically the top 100-200 meters), receives ample sunlight for photosynthesis. The vast surface area of the open ocean is well-lit. So, while sunlight limits life in the deep ocean, it is not the primary limiting factor for productivity at the surface of the open ocean.

• (b) Low water temperature is not the primary limiting factor in most of the ocean. While temperature affects metabolic rates, phytoplankton can thrive in a wide range of temperatures, from tropical to polar waters. In fact, some of the most productive ocean regions are in cold, high-latitude waters.

• (c) Scarcity of essential nutrients is the correct answer. The open ocean is often described as a “biological desert.” This is because the sunlit surface waters are strongly stratified and do not mix well with the cold, nutrient-rich waters below. As phytoplankton grow, they consume the available nutrients (like nitrates, phosphates, and silicates). When these organisms die, they sink out of the photic zone, taking the nutrients with them. Without a mechanism like upwelling to bring these nutrients back to the surface, productivity is severely limited. This is the key reason why coastal upwelling zones are so much more productive than the open ocean.

(d) High hydrostatic pressure is a characteristic of the deep ocean. It is a major physiological challenge for organisms living there, but it is not a factor that limits productivity in the sunlit surface layers where photosynthesis occurs.

Solution: C

• Question 3 of 5 3. Question With reference to major deserts of the world, consider the following statements: The Sahara Desert’s expansion is primarily driven by its location within the subtropical high-pressure belt. The Gobi Desert is a hot, tropical sand-dune desert similar in climate to the Arabian Desert. The Patagonian Desert is a cold winter desert that exists largely due to the rain-shadow effect of the Andes Mountains. Which of the statements given above are correct? (a) 1 and 2 only (b) 2 and 3 only (c) 1, 2 and 3 (d) 1 and 3 only Correct Solution: D Statement 1 is correct. The Sahara Desert is the world’s largest hot desert. Its existence is primarily a result of global atmospheric circulation patterns. It is located around the Tropic of Cancer, in a zone known as the subtropical high-pressure belt (or horse latitudes). In this belt, air from the upper atmosphere descends, warms up, and becomes very dry, inhibiting cloud formation and precipitation year-round. This large-scale subsidence of air is the main reason for the desert’s formation. Statement 2 is incorrect. The Gobi Desert, located in China and Mongolia, is a cold winter desert, not a hot tropical one. Its high latitude and elevation result in very cold winters, with temperatures dropping well below freezing. It is also a rain-shadow desert, lying in the lee of the Himalayas. Its climate is completely different from the hot, arid climate of the Arabian Desert. Statement 3 is correct. The Patagonian Desert in Argentina is a classic example of a rain-shadow desert. The prevailing moisture-bearing winds in these latitudes are the Westerlies, which come from the Pacific Ocean. These winds are forced to rise over the high Andes Mountains, dropping all their moisture on the western (Chilean) side. The air that descends on the eastern (Argentinian) side is dry, creating the arid conditions of the Patagonian desert. Incorrect Solution: D Statement 1 is correct. The Sahara Desert is the world’s largest hot desert. Its existence is primarily a result of global atmospheric circulation patterns. It is located around the Tropic of Cancer, in a zone known as the subtropical high-pressure belt (or horse latitudes). In this belt, air from the upper atmosphere descends, warms up, and becomes very dry, inhibiting cloud formation and precipitation year-round. This large-scale subsidence of air is the main reason for the desert’s formation. Statement 2 is incorrect. The Gobi Desert, located in China and Mongolia, is a cold winter desert, not a hot tropical one. Its high latitude and elevation result in very cold winters, with temperatures dropping well below freezing. It is also a rain-shadow desert, lying in the lee of the Himalayas. Its climate is completely different from the hot, arid climate of the Arabian Desert. Statement 3 is correct. The Patagonian Desert in Argentina is a classic example of a rain-shadow desert. The prevailing moisture-bearing winds in these latitudes are the Westerlies, which come from the Pacific Ocean. These winds are forced to rise over the high Andes Mountains, dropping all their moisture on the western (Chilean) side. The air that descends on the eastern (Argentinian) side is dry, creating the arid conditions of the Patagonian desert.

#### 3. Question

With reference to major deserts of the world, consider the following statements:

• The Sahara Desert’s expansion is primarily driven by its location within the subtropical high-pressure belt.

• The Gobi Desert is a hot, tropical sand-dune desert similar in climate to the Arabian Desert.

• The Patagonian Desert is a cold winter desert that exists largely due to the rain-shadow effect of the Andes Mountains.

Which of the statements given above are correct?

• (a) 1 and 2 only

• (b) 2 and 3 only

• (c) 1, 2 and 3

• (d) 1 and 3 only

Solution: D

• Statement 1 is correct. The Sahara Desert is the world’s largest hot desert. Its existence is primarily a result of global atmospheric circulation patterns. It is located around the Tropic of Cancer, in a zone known as the subtropical high-pressure belt (or horse latitudes). In this belt, air from the upper atmosphere descends, warms up, and becomes very dry, inhibiting cloud formation and precipitation year-round. This large-scale subsidence of air is the main reason for the desert’s formation.

• Statement 2 is incorrect. The Gobi Desert, located in China and Mongolia, is a cold winter desert, not a hot tropical one. Its high latitude and elevation result in very cold winters, with temperatures dropping well below freezing. It is also a rain-shadow desert, lying in the lee of the Himalayas. Its climate is completely different from the hot, arid climate of the Arabian Desert.

• Statement 3 is correct. The Patagonian Desert in Argentina is a classic example of a rain-shadow desert. The prevailing moisture-bearing winds in these latitudes are the Westerlies, which come from the Pacific Ocean. These winds are forced to rise over the high Andes Mountains, dropping all their moisture on the western (Chilean) side. The air that descends on the eastern (Argentinian) side is dry, creating the arid conditions of the Patagonian desert.

Solution: D

• Question 4 of 5 4. Question Consider the following statements: Statement-I: In the Northern Hemisphere, warm ocean currents flowing northwards are deflected to their right. Statement-II: The Coriolis effect, arising from the Earth’s rotation, deflects all moving objects, including ocean currents, to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. 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 warm ocean currents in the Northern Hemisphere that flow from the equator towards the poles (northwards) show a consistent deflection to the right. For example, the Kuroshio Current in the Pacific and the Gulf Stream in the Atlantic both curve eastwards (to their right) as they move north. This deflection is a key factor in the formation of large oceanic gyres. Statement-II correctly describes the Coriolis effect. The Coriolis effect is an inertial force that acts on objects in motion within a rotating frame of reference. On Earth, this rotation causes a deflection of moving objects (like wind, ocean currents, and even long-range projectiles). The direction of deflection is to the right of the direction of motion in the Northern Hemisphere and to the left in the Southern Hemisphere. The effect is strongest at the poles and zero at the equator. Statement-II provides the fundamental physical law that explains the observation in Statement-I. Incorrect Solution: A Statement-I is correct. Major warm ocean currents in the Northern Hemisphere that flow from the equator towards the poles (northwards) show a consistent deflection to the right. For example, the Kuroshio Current in the Pacific and the Gulf Stream in the Atlantic both curve eastwards (to their right) as they move north. This deflection is a key factor in the formation of large oceanic gyres. Statement-II correctly describes the Coriolis effect. The Coriolis effect is an inertial force that acts on objects in motion within a rotating frame of reference. On Earth, this rotation causes a deflection of moving objects (like wind, ocean currents, and even long-range projectiles). The direction of deflection is to the right of the direction of motion in the Northern Hemisphere and to the left in the Southern Hemisphere. The effect is strongest at the poles and zero at the equator. Statement-II provides the fundamental physical law that explains the observation in Statement-I.

#### 4. Question

Consider the following statements:

Statement-I: In the Northern Hemisphere, warm ocean currents flowing northwards are deflected to their right.

Statement-II: The Coriolis effect, arising from the Earth’s rotation, deflects all moving objects, including ocean currents, to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

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 warm ocean currents in the Northern Hemisphere that flow from the equator towards the poles (northwards) show a consistent deflection to the right. For example, the Kuroshio Current in the Pacific and the Gulf Stream in the Atlantic both curve eastwards (to their right) as they move north. This deflection is a key factor in the formation of large oceanic gyres.

• Statement-II correctly describes the Coriolis effect. The Coriolis effect is an inertial force that acts on objects in motion within a rotating frame of reference. On Earth, this rotation causes a deflection of moving objects (like wind, ocean currents, and even long-range projectiles). The direction of deflection is to the right of the direction of motion in the Northern Hemisphere and to the left in the Southern Hemisphere. The effect is strongest at the poles and zero at the equator.

• Statement-II provides the fundamental physical law that explains the observation in Statement-I.

Solution: A

• Statement-II provides the fundamental physical law that explains the observation in Statement-I.

• Question 5 of 5 5. Question Consider the following statements to distinguish between a tsunami and a wind-generated wave: A tsunami has a much longer wavelength than a wind-generated wave. In the deep ocean, a tsunami travels much faster than the fastest wind-generated waves. The wave height of a tsunami is exceptionally large in the deep ocean and decreases as it approaches the coast. The destructive power of a tsunami is primarily due to its immense speed, whereas that of a wind wave is due to its height. 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 correct. Tsunamis have extremely long wavelengths, often exceeding 200 kilometers in the deep ocean. In contrast, even the largest wind-generated waves have wavelengths typically measured in hundreds of meters. Statement 2 is correct. The speed of a tsunami is dependent on the water depth. In the deep ocean (e.g., 4,000 meters deep), a tsunami can travel at speeds over 700 km/h, comparable to a jet aircraft. Wind-generated waves are much slower, with their speed related to their wavelength and period. Statement 3 is incorrect. In the deep ocean, a tsunami’s wave height (amplitude) is often very small, typically less than a meter. This is why they can pass unnoticed by ships in deep water. As the tsunami enters shallower coastal waters, its speed decreases, and the immense energy is compressed, causing the wave height to increase dramatically and catastrophically. Statement 4 is incorrect. While the speed of a tsunami is immense, its destructive power comes from the massive volume of water and the powerful surge it creates, which can inundate coastal areas for an extended period. The wind wave’s power comes from the energy transferred from the wind, manifested in both height and the force of the breaking wave. The primary destructive force of a tsunami is its momentum and the sustained inundation it causes, not just its speed. Incorrect Solution: B Statement 1 is correct. Tsunamis have extremely long wavelengths, often exceeding 200 kilometers in the deep ocean. In contrast, even the largest wind-generated waves have wavelengths typically measured in hundreds of meters. Statement 2 is correct. The speed of a tsunami is dependent on the water depth. In the deep ocean (e.g., 4,000 meters deep), a tsunami can travel at speeds over 700 km/h, comparable to a jet aircraft. Wind-generated waves are much slower, with their speed related to their wavelength and period. Statement 3 is incorrect. In the deep ocean, a tsunami’s wave height (amplitude) is often very small, typically less than a meter. This is why they can pass unnoticed by ships in deep water. As the tsunami enters shallower coastal waters, its speed decreases, and the immense energy is compressed, causing the wave height to increase dramatically and catastrophically. Statement 4 is incorrect. While the speed of a tsunami is immense, its destructive power comes from the massive volume of water and the powerful surge it creates, which can inundate coastal areas for an extended period. The wind wave’s power comes from the energy transferred from the wind, manifested in both height and the force of the breaking wave. The primary destructive force of a tsunami is its momentum and the sustained inundation it causes, not just its speed.

#### 5. Question

Consider the following statements to distinguish between a tsunami and a wind-generated wave:

• A tsunami has a much longer wavelength than a wind-generated wave.

• In the deep ocean, a tsunami travels much faster than the fastest wind-generated waves.

• The wave height of a tsunami is exceptionally large in the deep ocean and decreases as it approaches the coast.

• The destructive power of a tsunami is primarily due to its immense speed, whereas that of a wind wave is due to its height.

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 correct. Tsunamis have extremely long wavelengths, often exceeding 200 kilometers in the deep ocean. In contrast, even the largest wind-generated waves have wavelengths typically measured in hundreds of meters.

• Statement 2 is correct. The speed of a tsunami is dependent on the water depth. In the deep ocean (e.g., 4,000 meters deep), a tsunami can travel at speeds over 700 km/h, comparable to a jet aircraft. Wind-generated waves are much slower, with their speed related to their wavelength and period.

• Statement 3 is incorrect. In the deep ocean, a tsunami’s wave height (amplitude) is often very small, typically less than a meter. This is why they can pass unnoticed by ships in deep water. As the tsunami enters shallower coastal waters, its speed decreases, and the immense energy is compressed, causing the wave height to increase dramatically and catastrophically.

• Statement 4 is incorrect. While the speed of a tsunami is immense, its destructive power comes from the massive volume of water and the powerful surge it creates, which can inundate coastal areas for an extended period. The wind wave’s power comes from the energy transferred from the wind, manifested in both height and the force of the breaking wave. The primary destructive force of a tsunami is its momentum and the sustained inundation it causes, not just its speed.

Solution: B

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