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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 2 · 25 questions

Practice questions

01Why is radiometric dating useful in studying Earth's origin?

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02What was the significance of vortex-like structures in Weizsäcker's ideas?

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03How was Otto Schmidt's hypothesis different from older tidal ideas?

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04In the solar nebula theory, the idea of the frost line helps explain which difference?

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05The formation of galaxies after the Big Bang is linked with which broad idea?

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06Which statement correctly differentiates the early atmosphere from the present atmosphere?

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07Which option gives the correct sequence?

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08What does the angular momentum problem of the nebular hypothesis mean?

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09In which situation would answering steady state theory be wrong?

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10After early Earth cooled and crust formed, which development became possible?

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11Which statement correctly links planet formation and Earth's internal structure with different processes?

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12Why did modern theories give less importance to the role of an external star in early theories?

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13Which example best shows the evolving nature of scientific theories?

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14Why is the Big Bang theory not called a direct theory of Earth's origin?

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15If a question mentions water vapour, carbon dioxide, and nitrogen in an early stage, it relates to which topic?

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16Which option correctly matches evidence and conclusion of the same theory?

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17Why did the center and disk develop differently during gravitational collapse of the solar nebula?

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18Which statement gives a difficult but correct explanation of Earth's gradual evolution?

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19In which situation is the clue for the planetesimal hypothesis strongest?

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20Why is the modern solar nebula theory considered more comprehensive than many older theories?

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21Which sequence best arranges cosmological and geological events?

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22Which statement shows that planet formation and atmosphere formation are different stages?

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23What is the significance of the origin of light elements in the Big Bang theory?

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24If an answer writes only Big Bang for formation of Earth's layers, why is it incomplete?

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25If a question asks different composition of planets inside and outside the frost line, the correct explanation will be based on what?

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