World and Physical Geography

221. Which meridian forms the boundary line between the Indian Ocean and th

Which meridian forms the boundary line between the Indian Ocean and the Pacific Ocean ?

[amp_mcq option1=”The meridian of Cape of Tasmania” option2=”The meridian of Cape Town” option3=”The meridian of Wellington” option4=”The meridian of Perth” correct=”option1″]

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The meridian of Cape of Tasmania (approximately 147°E) is used as part of the boundary definition between the Indian Ocean and the Pacific Ocean.
The International Hydrographic Organization (IHO) defines the boundaries of oceans and seas. According to the IHO definition (specifically S-23, Limits of Oceans and Seas, 3rd Edition, 1953), the meridian of 146°55′ E running south from the southern extremity of Tasmania forms part of the boundary between the Indian Ocean and the Pacific Ocean (separating the Great Australian Bight from the Tasman Sea). Cape of Tasmania is the southern point of Tasmania.
Cape Town is located near the boundary between the Atlantic Ocean and the Indian Ocean. Wellington is in New Zealand, well within the Pacific Ocean. Perth is on the west coast of Australia, situated on the Indian Ocean coast. The boundaries of oceans can be complex and are defined by various international bodies or conventions, often following geographical features or lines of longitude/latitude.

222. The Sargasso Sea is a vast patch of Atlantic Ocean characterized by an

The Sargasso Sea is a vast patch of Atlantic Ocean characterized by an abundance of floating brown seaweed called ‘Sargassum’. This is formed due to the deposit of marine plants and refuse carried by the :
1. North Atlantic current
2. Canary current
3. North Atlantic Equatorial current
Select the correct answer using the code given below :

[amp_mcq option1=”1 only” option2=”2 and 3 only” option3=”1 and 3 only” option4=”1, 2 and 3″ correct=”option4″]

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The Sargasso Sea is a region in the North Atlantic Ocean that is bounded by the currents forming the North Atlantic Gyre.
The currents that form the North Atlantic Gyre and trap the Sargassum seaweed are the Gulf Stream (to the west), the North Atlantic Current (to the north), the Canary Current (to the east), and the North Atlantic Equatorial Current (to the south). All three currents listed in the options (North Atlantic current, Canary current, North Atlantic Equatorial current) are part of the boundary currents that define and circulate around the Sargasso Sea, contributing to the accumulation of floating material within it.
The Sargasso Sea is unique as it is the only sea in the world that is defined by ocean currents rather than by land boundaries. Its calm, clear waters are home to a unique ecosystem, including the Sargassum seaweed which provides habitat for numerous marine species. The lack of strong currents within the gyre allows the seaweed and other floating debris to accumulate.

223. The Mariana trench is the deepest part of the Oceans. Which one among

The Mariana trench is the deepest part of the Oceans. Which one among the following statements regarding this is not correct ?
– It is located in the Western Pacific Ocean, to the West of Mariana island
– The trench was first sounded during the Challenger expedition in 1875
– The trench is about 2550 km long and an average width of only 69 km
– At the bottom of the trench the water column above exerts a pressure over 1000 times the standard atmospheric pressure at sea level

[amp_mcq option1=”It is located in the Western Pacific Ocean, to the West of Mariana island” option2=”The trench was first sounded during the Challenger expedition in 1875″ option3=”The trench is about 2550 km long and an average width of only 69 km” option4=”At the bottom of the trench the water column above exerts a pressure over 1000 times the standard atmospheric pressure at sea level” correct=”option1″]

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The incorrect statement is that the Mariana Trench is located to the West of the Mariana Islands.
The Mariana Trench is located in the western Pacific Ocean, but it lies *east and south* of the Mariana Islands. The trench runs roughly north-south/northeast-southwest, with the islands located to its west.
– The Challenger expedition did indeed make the first recorded sounding of the trench in 1875.
– The dimensions of the trench are approximately 2550 km (1,580 miles) long and 69 km (43 miles) wide, making statement C correct.
– The maximum depth of the Challenger Deep in the Mariana Trench is over 10,994 meters (~11 km). Hydrostatic pressure increases by approximately 1 atm for every 10 meters of depth. At 11 km, the pressure is about 1100 atm, which is indeed over 1000 times standard atmospheric pressure at sea level, making statement D correct.

224. Which one among the following countries of Asia is land-locked ?

Which one among the following countries of Asia is land-locked ?

[amp_mcq option1=”Vietnam” option2=”Cambodia” option3=”Laos” option4=”Thailand” correct=”option3″]

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A landlocked country is a sovereign state entirely enclosed by land, having no access to the open sea.
Among the given options, Laos is the only country that does not have a coastline. It is bordered by China, Vietnam, Cambodia, Thailand, and Myanmar.
– Vietnam has a long coastline on the South China Sea.
– Cambodia has a coastline on the Gulf of Thailand.
– Thailand has coastlines on the Gulf of Thailand and the Andaman Sea.
– Other landlocked countries in Asia include Afghanistan, Armenia, Azerbaijan (partially bordered by the Caspian Sea, sometimes considered landlocked), Bhutan, Kazakhstan, Kyrgyzstan, Mongolia, Nepal, Tajikistan, Turkmenistan, Uzbekistan.

225. The inner most region of a hurricane is known as hurricane-eye where :

The inner most region of a hurricane is known as hurricane-eye where :

[amp_mcq option1=”temperature is highest and pressure is the lowest” option2=”temperature is lowest and pressure is the lowest” option3=”sky is clear and temperature is the lowest” option4=”sky is under dense cloud cover and pressure is the lowest” correct=”option1″]

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The inner most region of a hurricane, known as the eye, is characterized by the lowest atmospheric pressure at the surface and the warmest temperatures at the surface within the storm.
The eye forms in the center of the hurricane where air sinks. This descending air suppresses cloud formation, leading to clear or partly cloudy skies and calm conditions in contrast to the violent eyewall surrounding it. As the air descends, it warms adiabatically, resulting in warmer temperatures, especially at the surface. The central pressure in the eye is the lowest in the entire storm, a defining characteristic of intense tropical cyclones.
The eyewall, surrounding the eye, is the most intense part of the hurricane, containing the strongest winds and heaviest rainfall. The transition from the violent eyewall to the calm eye is often abrupt and dramatic for anyone experiencing it.

226. The Kuroshio is a north flowing Ocean current on the west side of the

The Kuroshio is a north flowing Ocean current on the west side of the North Pacific Ocean. Which one among the following statements regarding this is not correct ?

[amp_mcq option1=”It is similar to the Gulf Stream in the North Atlantic Ocean” option2=”It transports warm, tropical water northward towards the Polar region” option3=”The warm water of the Kuroshio current sustains the coral reefs of Japan” option4=”It begins off the coast of Japan and flows northward” correct=”option4″]

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The correct answer is It begins off the coast of Japan and flows northward.
Let’s examine each statement about the Kuroshio current:
A) It is similar to the Gulf Stream in the North Atlantic Ocean: Both are strong, warm, western boundary currents in the Northern Hemisphere. This statement is correct.
B) It transports warm, tropical water northward towards the Polar region: This is the primary function and characteristic of a warm current flowing poleward. This statement is correct.
C) The warm water of the Kuroshio current sustains the coral reefs of Japan: The warm waters allow coral reefs to exist in higher latitudes than they otherwise could. Southern Japan (Ryukyu Islands) and parts of the mainland coast influenced by the Kuroshio have coral reefs. This statement is correct.
D) It begins off the coast of Japan and flows northward: The Kuroshio current originates from the North Equatorial Current in the western Pacific, flowing westwards and then turning north near the Philippines and Taiwan. It then flows northward along the east coast of Japan before turning eastward into the North Pacific as the Kuroshio Extension. Therefore, it flows *along* the coast of Japan but does *not* begin there. Its origin is further south and west. This statement is incorrect.
The Kuroshio, also known as the Japan Current, plays a significant role in the climate and marine ecosystems of the region, influencing temperatures, precipitation patterns, and marine life distribution.

227. Consider the following statements: Statement I: Roaring Forties are

Consider the following statements:

  • Statement I: Roaring Forties are strong Westerly winds found in the Southern Hemisphere, generally between the latitudes of 40° and 50°
  • Statement II: The strong East to West air currents are caused by the combination of air being displaced from the Equator towards the South Pole and the Earth’s rotation and there are few landmasses to serve as wind breaks

[amp_mcq option1=”Both the statements are individually true and Statement II is the correct explanation of Statement I” option2=”Both the statements are individually true but Statement II is not the correct explanation of Statement I” option3=”Statement I is true but Statement II is false” option4=”Statement I is false but Statement II is true” correct=”option1″]

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Both Statement I and Statement II are individually true, and Statement II is the correct explanation of Statement I. The Roaring Forties are powerful westerly winds found in the Southern Hemisphere, specifically between latitudes 40° and 50° South. Statement II accurately describes the primary factors contributing to these strong winds: the poleward movement of air from the subtropical high-pressure belts towards the subpolar low-pressure belts, deflected eastward by the Coriolis effect (caused by Earth’s rotation, making them Westerlies, i.e., blowing from the west), and the absence of significant landmasses in these latitudes of the Southern Hemisphere which allows the winds to blow unimpeded across large expanses of ocean, gaining strength.
The Roaring Forties are strong Westerly winds in the Southern Hemisphere mid-latitudes (40°-50°S). Their strength is due to the combined effect of atmospheric circulation patterns, the Coriolis effect, and the lack of continental landmasses acting as barriers.
Similar westerly winds exist in the Northern Hemisphere, but they are less consistently strong due to the presence of large continents. Further south, other zones of strong westerlies are known as the ‘Furious Fifties’ (50°-60°S) and the ‘Screaming Sixties’ (south of 60°S).

228. Consider the following statements: Statement I: The Doldrums is a l

Consider the following statements:

  • Statement I: The Doldrums is a low pressure area around the Equator where the prevailing winds are calm
  • Statement II: Low pressure is caused by the heat at the Equator which makes the air rise and travel both Northwards and Southwards

[amp_mcq option1=”Both the statements are individually true and Statement II is the correct explanation of Statement I” option2=”Both the statements are individually true but Statement II is not the correct explanation of Statement I” option3=”Statement I is true but Statement II is false” option4=”Statement I is false but Statement II is true” correct=”option1″]

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Both Statement I and Statement II are individually true, and Statement II is the correct explanation of Statement I. The Doldrums is indeed a low-pressure belt located around the Equator, known for calm or light winds, variable winds, and frequent convectional rainfall. This low pressure is a direct result of intense solar heating at the Equator, which causes the air to warm, become less dense, and rise. As the air rises, it diverges towards the poles at higher altitudes, creating the low-pressure area at the surface and leading to relatively calm horizontal surface winds.
The Doldrums (Intertropical Convergence Zone or ITCZ) is an equatorial low-pressure zone characterized by calm winds. The intense heat at the equator causes air to rise (convection), creating this low pressure and leading to the characteristic weather conditions.
The rising air in the Doldrums cools adiabatically, leading to condensation and heavy convectional rainfall. The zone shifts slightly north and south with the apparent movement of the sun. The calmness is due to the predominantly vertical movement of air rather than strong horizontal winds, posing a historical challenge for sailing ships.

229. Which one among the following is the major occupation in equatorial

Which one among the following is the major occupation in equatorial region?

[amp_mcq option1=”Growing of tropical crops” option2=”Growing of cereals” option3=”Growing of citrus fruits” option4=”Animal rearing” correct=”option1″]

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The correct answer is A. The equatorial region is characterized by a hot and wet climate throughout the year, which is ideal for the cultivation of various tropical crops.
– The climate of the equatorial region (lying roughly between 5° North and 5° South latitude) is characterized by high temperatures, high humidity, and heavy rainfall.
– This climate supports dense tropical rainforests and is suitable for growing crops like rubber, cocoa, coffee, palm oil, spices, bananas, etc.
– Plantation agriculture, focused on these tropical crops, is a significant economic activity in many equatorial regions.
While other activities may exist locally, the cultivation of tropical crops is the most widespread and defining major agricultural occupation across the equatorial belt compared to cereal farming (more common in temperate zones), citrus fruit farming (more sub-tropical/tropical), or animal rearing (highly variable and often limited by disease in dense rainforest environments).

230. The Wallace’s Line distinguishes or separates the flora and fauna

The Wallace’s Line distinguishes or separates the flora and fauna between

[amp_mcq option1=”Canada and USA” option2=”Taiga region and Tundra region” option3=”Mexico and Central America” option4=”South-East Asia and Australasia” correct=”option4″]

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The correct answer is D. Wallace’s Line is a faunal boundary line that separates the ecozones of Asia and Wallacea, a transitional zone between Asia and Australia. It effectively distinguishes or separates the flora and fauna between South-East Asia and Australasia.
– Wallace’s Line was proposed by Alfred Russel Wallace based on his observations of dramatic differences in animal distribution across the Malay Archipelago.
– West of the line, species are largely of Asian origin (e.g., tigers, rhinos, monkeys).
– East of the line, species are largely of Australian origin (e.g., marsupials, cockatoos).
– The line runs through Indonesia, between Borneo and Sulawesi, and between Bali and Lombok.
Wallace’s Line is thought to reflect a deep ocean trench that acted as a barrier to migration even during lower sea levels in glacial periods. This prevented many species from crossing between the Asian and Australian continental shelves.
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