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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.

Easy · Level 5 · 25 questions

Practice questions

01Which philosopher is associated with the early idea of the Nebular Hypothesis?

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Answer and explanation

02Who later modified Kant's Nebular Hypothesis?

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03In the Planetesimal Hypothesis what is considered the main material for planet formation?

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Answer and explanation

04Chamberlain and Moulton are associated with which hypothesis?

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05In the Tidal Hypothesis what caused material to be drawn out from the Sun?

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06James Jeans and Harold Jeffreys are related to which theory?

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07Which is the most accepted theory for the modern explanation of the origin of the universe?

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08According to the Big Bang Theory what was the universe like initially?

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09Evidence of the expansion of the universe is linked with whose discovery?

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10Galaxies moving away indicate what?

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11After the Big Bang what happened to the temperature of the universe as it expanded?

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12Cosmic microwave background radiation is considered evidence for which theory?

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13Our solar system is a part of which galaxy?

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14What is the simple meaning of solar nebula?

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15In the modern view planet formation is explained by which process?

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16What is called a protoplanet?

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17What formed due to greater condensation of matter at the centre of the solar nebula?

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18What is understood from the solar nebula becoming a flat disk?

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19What was a main reason for the early Earth being very hot?

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20Which theory assumes the universe began from an extremely dense state?

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21Which clue most easily identifies the Tidal Hypothesis?

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22Which is the simple correct sequence of modern solar system formation?

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23Which general sequence after the Big Bang is correct?

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24Which option is an example of early theories of Earth's origin?

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25What was a common limitation of early theories?

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