World & Physical Geography MCQs

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Most of the coral reefs are found in Pacific Ocean. Pacific ocean has twice as many coral species as in Atlantic Ocean reefs. About 75% of the total coral reef in United States, is located in the Pacific Ocean.

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Lithification gives rise to sedimentary rocks. Out of the above, only Feldspar is a sedimentary rock.

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Quicksand is a colloid which consist of fine granular material like sand, silt or clay and water. The Quicksand formed in saturated loose sand. When water in the sand cannot escape, it creates a liquefied soil that loses strength and cannot support weight.

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In 2001, the North Magnetic Pole was determined to be near Ellesmere Island, which is part of the Canadian Arctic Archipelago. The North Magnetic Pole is the point where the Earth’s magnetic field points vertically downwards. Its location shifts due to changes in the Earth’s magnetic field, moving from the Canadian Arctic towards Russia. Ellesmere Island is one of the northernmost landmasses in Canada, known for its remote wilderness and extreme climate.

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Radiation from Sun comes to earth in the form of smaller waves and earth being cooler body, gives off energy in the form of long-wave. These are then radiated back to the atmosphere. This this Long-Wave Radiation from the earth’s surfaces heats the lower layers of the atmosphere. The Atmospheric conduction occurs at the interface of (zone of contact between) the atmosphere and the earth’s surface. However, it is actually a minor method of heat transfer in terms of warming the atmosphere since it affects only the layers of air closest to the earth’s surface. This is because air is a very poor conductor of heat. ‘ When the pockets of air near the surface are heated, they expand in volume, become less dense than the surrounding air, and therefore rise. This vertical transfer of heat through the atmosphere is called convection, and is the same type of process by which heated water circulates in a pan while heating. The currents set into motion by the heating of a fluid (liquid or gas) make up a convectional system. Most vertical transfer of heat within the atmosphere & Oceans occurs via Convection and is a major cause of clouds and precipitation.

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Seabed is a vast repository of minerals, including the precious cobalt, zinc, manganese and rare earth materials that are needed for smart phones, laptops and hybrid cars. They are present in the three forms:

• Polymetallic manganese nodules that remain strewn across the ocean floor
• Cobalt-rich ferromanganese crusts that cover the seamounts
• Massive polymetallic sulphide deposits around hydrothermal vents.

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The Kuroshio is a north-flowing warm ocean current on the west side of the North Pacific Ocean. It is similar to the Gulf Stream in the North Atlantic Ocean.

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An electrojet is a streaming movement of charged particles in the lower ionosphere. Ionosphere is a region of Earth's upper atmosphere, extending from about 60 km to 1,000 km altitude. Electrojets are mainly found at altitudes between 100 to 150 km.

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India is currently the world’s largest rice exporter with US$ 5.5 Billion. India’s rice exports constitutes about 26.3% of total rice exports in the world

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Over the western North Pacific and the South China Sea, tropical cyclones having maximum sustained winds reaching 118 km/h or more are known as ‘typhoons’.