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Subjects

Geography

Star formation, formation of planets, and our solar system

In this Class 11 Geography topic from “The Origin and Evolution of the Earth,” students explore how stars form from vast clouds of gas and dust and how planets emerge from the material surrounding a young star. They examine the formation and organisation of the solar system, including the Sun, planets, satellites, asteroids and comets, while connecting these processes with Earth’s place, structure and early development within the wider universe.

Hard · Level 5 · 25 questions

Practice questions

01Which is the most balanced explanation for understanding the origin of the solar system?

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02After planetary seeds formed in the protoplanetary disk which type of planet formation would be most affected if gas disappeared quickly?

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03What is the main initial energy source that drives contraction of a gaseous cloud during star formation?

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04Before a protostar forms, where does matter become most concentrated?

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05In the solar nebula theory, which process is considered basic for planet formation?

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06The dense and rocky nature of inner planets is most closely related to which cause?

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07What is the main reason for the large size and gaseous nature of outer planets?

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08What is the significance of the frost line in planet formation?

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09Planetesimals represent which stage?

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10What is the result of differentiation in Earth-like planets?

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11How is conservation of angular momentum reflected in solar system formation?

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12How did early solar wind affect the inner planets?

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13Which condition is most suitable for star groups to form in a galaxy?

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14What explains the nearly same orbital plane of planets in a protoplanetary disk?

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15The asteroid belt in the solar system is mainly located between which two planets?

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16The existence of the asteroid belt supports which idea?

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17How does Jupiter's strong gravity affect the asteroid belt?

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18The Kuiper Belt is associated with which region of the solar system?

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19The composition of comets indicates which aspect of planet formation?

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20Why is the average density of Jovian planets lower than that of terrestrial planets?

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21Which statement best explains the role of collisions in planet formation?

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22How does the giant impact hypothesis explain the origin of the Moon?

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23Which cause best explains the heating of early Earth?

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24What can be called a protoplanet in the early solar system?

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25What is one major reason Mercury has a very thin atmosphere?

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