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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.

Hard · Level 4 · 25 questions

Practice questions

01If a question mentions solar nebula, gravitational collapse, Sun at center, and planets in disk, what is the correct conclusion?

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Answer and explanation

02Which statement correctly shows the changeable nature of scientific theories?

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03Which option correctly matches the theory and scale?

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04Which option gives an incorrect match?

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05Through which process did water vapour in the early atmosphere later become related to the hydrosphere?

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06What is the main physical basis for dust particles becoming planetesimals during planet formation?

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07In modern planet formation, the existence of the asteroid belt can indicate what?

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08Formation of galaxies after the Big Bang is considered a result of which process?

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09Why is the early formation of light elements important in the Big Bang theory?

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10If an answer writes only Big Bang for Earth's layers, what is the main weakness?

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11Which statement shows the strong explanatory power of the solar nebula theory?

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12Which question clue most strongly identifies the tidal theory?

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13Which question clue most strongly identifies the modern solar nebula theory?

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14Which sequence correctly moves from cosmic to Earth-level development?

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15Which option correctly compares old and modern theories?

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16Which statement correctly gives a limitation of the steady state theory?

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17Which statement correctly gives the roles of center and disk in the solar nebula model?

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18If a question asks about rocky inner planets and gaseous outer planets, which pair will be most useful in the answer?

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19Why did the possibility of hydrosphere development increase after Earth's crust formed?

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20Which statement gives a difficult but correct reason for development of the early atmosphere?

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21Which option gives the correct reasoning chain from evidence to conclusion?

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22Which option chooses the wrong process for Earth's origin?

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23If an exam asks which model is more accepted today for the origin of the solar system, what is the most accurate answer with reason?

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24Why is Buffon's collision-related idea considered weak from the modern viewpoint?

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25In Kant's nebular hypothesis, gravity mainly played a role in what?

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