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Subjects

Geography

Early and modern theories

In Class 11 Geography, this topic explores how explanations for the origin and evolution of the Earth developed from early philosophical ideas to modern scientific theories. Students compare major hypotheses, including nebular explanations, and examine the astronomical, geological, and physical evidence used to understand the formation of the solar system and Earth. The topic also shows how observations, discoveries, and improved scientific models continually refine our understanding of the planet.

Medium · Level 2 · 25 questions

Practice questions

01Why is differentiation important in Earth's evolution?

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02Which statement best explains the modern theory of planet formation?

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03What is the process of release of gases that helped form Earth's early atmosphere called?

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04What is the correct relation between planetesimals and protoplanets?

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05Which theory considered matter pulled from the Sun as the basis of later planet formation?

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06The Big Bang theory explains not only Earth's origin but mainly the origin of what?

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07In the modern solar nebula theory, what mainly caused the Sun to form at the center?

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08The problem of angular momentum is often raised in criticism of which older theories?

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09Which of the following pairs is correct?

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10Why is the modern solar nebula theory considered more acceptable?

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11If a question mentions a disk-like structure of gas and dust around the Sun, which theory does it indicate?

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12The idea of an expanding universe is a central feature of which theory?

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13What was the result of repeated collisions during early planet formation?

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14Which statement correctly states a limitation of the tidal theory?

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15In the nebular theory, why does rotational speed increase?

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16What is the correct relation between the Big Bang theory and the solar nebula theory?

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17What is the flat disk formed by gravitational collapse of a gas and dust cloud called?

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18Which statement gives the correct result of cooling of early Earth?

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19Which evidence for the Big Bang is related to space observations rather than directly to Earth's surface?

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20What is one similarity between the older tidal and planetesimal theories?

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21What is the role of gravity in modern planet formation?

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22Which option correctly matches the theory with its scale of study?

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23Heavy elements moving toward the center during early Earth evolution indicates what?

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24Which modern evidence helped show that the universe is not static?

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25If a theory gives the sequence from small particles to planetesimals, then protoplanets, and finally planets, which modern idea does it match?

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