World & Physical Geography MCQs

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The longest river of Democratic People’s Republic of Korea is Yalu river. It is about 790 km long and is also known as Amnok river.

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The longest river of the country is river Niger which is about 4,180 km long out of which about 1,700 km flows through Mali. It is the third-longest river of Africa.

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Sideways form of erosion is called lateral erosion. In lateral erosion, the river erodes away at its banks and widens the river channel. Together, vertical and lateral erosion create the distinctive V-shaped valley that is found in rivers in their upper course. As the river gets closer to the sea, there is more lateral erosion than vertical erosion and the V flattens out into a much wider shape.

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Pakistan shares a 1046km coastline with the Arabian sea and the Gulf of Oman to its south. Pakistan shares its land border with four nations including India, China, Iran, and Afghanistan.

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A solar eclipse occurs when the moon gets between Earth and the sun, and the moon casts a shadow over Earth. A solar eclipse can only take place at the phase of new moon, when the moon passes directly between the sun and Earth and its shadows fall upon Earth’s surface.

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Cliff is a high and extremely steep rock face that approaches the vertical, either inland or along a coastline. Cirque refers to a deep rounded hollow having steep sides, formed through erosion by snow and ice. Dune is a hill or ridge of sand accumulated and sorted by wind action.

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The course of a river from its source to its mouth is normally divided into 3 sections, namely upper, middle and lower courses. Action of the river on its valley from source to mouth in relation to the features developed by it is seen in he river valley profile, known as graded profile. Throughout the long profile of a river, deposition and erosion are balanced meaning that, given enough time, the river’s long profile would become a smooth, concave, graded profile from its source to mouth.

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A ford is a shallow place with good footing where a river or stream may be crossed by wading or inside a vehicle. A ford is mostly a natural phenomenon, in contrast to a low water crossing, which is an artificial bridge that allows crossing a river or stream when water is low.

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United States is the third largest country in terms of population after China and India.

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China is the world’s largest wheat producer with around 17% of total global production. Russia is the largest global wheat exporter.