MCQs
Total Questions : 471
| Page 47 of 48 pages
Answer: Option D. -> checking over-grazing
Answer: (d)
Overgrazing is the major cause of desertification worldwide. Plants of semi-arid areas are adapted to being eaten by sparsely scattered, large, grazing mammals which move in response to the patchy rainfall common to these regions.
Early human pastoralists living in semi-arid areas copied this natural system. They moved their small groups of domestic animals in response to food and water availability. Such regular stock movement prevented overgrazing of the fragile plant cover.
Answer: (d)
Overgrazing is the major cause of desertification worldwide. Plants of semi-arid areas are adapted to being eaten by sparsely scattered, large, grazing mammals which move in response to the patchy rainfall common to these regions.
Early human pastoralists living in semi-arid areas copied this natural system. They moved their small groups of domestic animals in response to food and water availability. Such regular stock movement prevented overgrazing of the fragile plant cover.
Answer: Option B. -> Deccan Trap
Answer: (b)
The Deccan Traps are a large igneous province located on the Deccan Plateau of west-central India (between 17°–24°N, 73°–74°E) and one of the largest volcanic features on Earth.
They consist of multiple layers of solidified flood basalt that together are more than 2,000 m (6,562 ft) thick and cover an area of $500000 km^2$ (193,051 sq mi) and a volume of $512000 km^3$ (123,000 cu mi).
The term “trap”, used in geology for such rock formations, is derived from the Swedish word for stairs and refers to the steplike hills forming the landscape of the region.
Answer: (b)
The Deccan Traps are a large igneous province located on the Deccan Plateau of west-central India (between 17°–24°N, 73°–74°E) and one of the largest volcanic features on Earth.
They consist of multiple layers of solidified flood basalt that together are more than 2,000 m (6,562 ft) thick and cover an area of $500000 km^2$ (193,051 sq mi) and a volume of $512000 km^3$ (123,000 cu mi).
The term “trap”, used in geology for such rock formations, is derived from the Swedish word for stairs and refers to the steplike hills forming the landscape of the region.
Answer: Option C. -> Arkose
Answer: (c)
Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.
It is commonly coarse-grained and usually either pink or grey (depending on the colour of feldspar).
Answer: (c)
Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar.
It is commonly coarse-grained and usually either pink or grey (depending on the colour of feldspar).
Answer: Option A. -> 25,000 km
Answer: (a)
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometres). But, if we measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km).
Thus, the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
Answer: (a)
The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometres). But, if we measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km).
Thus, the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
Answer: Option D. -> Atacama desert
Answer: (d)
Answer: (d)
Answer: Option C. -> Crust and Mantle
Answer: (c)
The Mohorovicic discontinuity usually referred to as the Moho, is the boundary between the Earth’s crust and the mantle. Named after the pioneering Croatian seismologist Andrija Mohorovicic, the Moho separates both the oceanic crust and continental crust from the underlying mantle.
The Moho mostly lies entirely within the lithosphere; only beneath mid-ocean ridges does it define the lithosphere-asthenosphere boundary.
Answer: (c)
The Mohorovicic discontinuity usually referred to as the Moho, is the boundary between the Earth’s crust and the mantle. Named after the pioneering Croatian seismologist Andrija Mohorovicic, the Moho separates both the oceanic crust and continental crust from the underlying mantle.
The Moho mostly lies entirely within the lithosphere; only beneath mid-ocean ridges does it define the lithosphere-asthenosphere boundary.
Answer: Option B. -> Igneous Rock
Answer: (b)
Igneous rocks are formed through the cooling and solidification of magma (or lava). As hot, molten rock rises to the surface, it undergoes changes in temperature and pressure that cause it to cool, solidify, and crystallize.
There are over 700 known types of igneous rock, the majority of which are formed beneath the surface of the Earth’s crust. However, some are also formed on the surface as a result of volcanic activity.
Answer: (b)
Igneous rocks are formed through the cooling and solidification of magma (or lava). As hot, molten rock rises to the surface, it undergoes changes in temperature and pressure that cause it to cool, solidify, and crystallize.
There are over 700 known types of igneous rock, the majority of which are formed beneath the surface of the Earth’s crust. However, some are also formed on the surface as a result of volcanic activity.
Answer: Option B. -> Loess
Answer: (b)
Loess is Aeolian sediment formed by the accumulation of wind-blown silt, typically in the 20– 50 micrometre size range, twenty per cent or less clay and the balance equal parts sand and silt that are loosely cemented by calcium carbonate.
It is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs. The word loess, with connotations of origin by wind deposited accumulation, is of German origin and means “loose.” It was first applied to the Rhine River valley loess about 1821.
Answer: (b)
Loess is Aeolian sediment formed by the accumulation of wind-blown silt, typically in the 20– 50 micrometre size range, twenty per cent or less clay and the balance equal parts sand and silt that are loosely cemented by calcium carbonate.
It is usually homogeneous and highly porous and is traversed by vertical capillaries that permit the sediment to fracture and form vertical bluffs. The word loess, with connotations of origin by wind deposited accumulation, is of German origin and means “loose.” It was first applied to the Rhine River valley loess about 1821.
Answer: Option D. -> 45º East
Answer: (d)
Answer: (d)
Answer: Option B. -> It is 180° Longitude
Answer: (b)
The International Date Line (IDL) is an imaginary line on the surface of the Earth, that runs from the north to the South Pole and demarcates one calendar day from the next.
It passes through the middle of the Pacific Ocean, roughly following the 180° longitude but it deviates to pass around some territories and island groups. From the north, the dateline first deviates to the east of 180° to pass to the east of Russia’s Wrangel Island and the Chukchi Peninsula which is the easternmost part of Russian Siberia.
The dateline then passes through the Bering Strait between the Diomede Islands at a distance of 1.5 km from each island. The line then bends considerably southwest, passing west of St. Lawrence Island and St. Matthew Island.
It then passes midway between Alaska’s Aleutian Islands and Russia’s Commander Islands before returning southeast to 180°. Thus all of Siberia is to the west of the International Date Line, and all of Alaska is to the east of that line.
Answer: (b)
The International Date Line (IDL) is an imaginary line on the surface of the Earth, that runs from the north to the South Pole and demarcates one calendar day from the next.
It passes through the middle of the Pacific Ocean, roughly following the 180° longitude but it deviates to pass around some territories and island groups. From the north, the dateline first deviates to the east of 180° to pass to the east of Russia’s Wrangel Island and the Chukchi Peninsula which is the easternmost part of Russian Siberia.
The dateline then passes through the Bering Strait between the Diomede Islands at a distance of 1.5 km from each island. The line then bends considerably southwest, passing west of St. Lawrence Island and St. Matthew Island.
It then passes midway between Alaska’s Aleutian Islands and Russia’s Commander Islands before returning southeast to 180°. Thus all of Siberia is to the west of the International Date Line, and all of Alaska is to the east of that line.
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