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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 3 · 25 questions

Practice questions

01In studying early and modern theories, which scale difference should be understood first?

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02Which theory gave more importance to gradual accumulation of small solid bodies in planet formation?

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03In Kant's hypothesis, what was the basic nature of the nebula?

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04According to Laplace, what kind of structure separated as the nebula contracted?

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05Why is the passing star important in the tidal theory?

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06According to the steady state theory, how do the average properties of the universe remain with time?

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07In the Big Bang theory, the universe is considered to have started from which state?

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08What does Hubble’s law strengthen about the universe?

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09Which is the most suitable sequence of planet formation in the modern solar nebula theory?

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10The concept of a protoplanetary disk helps explain what?

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11What is the main role of accretion in modern theories?

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12Which theory included the idea of creation of new matter along with expansion of the universe?

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13Cosmic microwave background radiation is considered major evidence of what?

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14What formed due to differentiation in early Earth's development?

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15If a theory says planets formed from matter drawn out of the Sun, what type of theory is it?

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16What effect was contraction assumed to have in the nebular hypothesis?

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17In the modern view, what is the most correct role of gravity during planet formation?

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18Which option correctly matches an old theory with its main idea?

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19Which event does the Big Bang theory directly try to explain?

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20What is the simple meaning of red shift?

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21Why are modern theories considered more scientific than early theories?

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22In the solar nebula theory, which major body formed at the center?

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23After early Earth cooled, which process was important in the development of the hydrosphere?

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24Which statement correctly describes the process from planetesimals to protoplanets?

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25What is the similarity between the nebular and modern solar nebula ideas?

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