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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.

Medium · Level 5 · 25 questions

Practice questions

01If a question asks how Earth's layers formed which term is most suitable?

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02What effect did the spreading of matter in a disk in the solar nebula have on planet formation?

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03When a star becomes stable what condition forms between gravity and internal pressure?

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04Why are cold and dense molecular clouds considered more suitable for star formation?

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05What condition can form for star formation when a nebula fragments?

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06What does the formation of a disk around a protostar indicate?

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07If the mass of a gas cloud is not enough what problem may occur in star formation?

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08Why was the sticking of tiny dust particles important before large collisions in planet formation?

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09What was the main reason for different behavior of gas and dust in the solar disk?

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10What was the main reason for small rocky planets forming inside the frost line?

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11What advantage helped planets grow large beyond the frost line?

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12What was the role of gravity in turning planetesimals into protoplanets?

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13Under which condition could a protoplanet grow rapidly?

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14The nearly circular elliptical orbits of most planets in the solar system are linked with what?

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15Conservation of angular momentum explains which event in the origin of the solar system?

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16What identifies the main sequence stage of a star?

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17Why can a protostar glow even before fusion begins?

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18Which feature of inner planets became stronger due to removal of light gases by solar wind?

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19What is the main reason for the very large atmospheres of gas giants?

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20Which materials are important in calling Uranus and Neptune ice giants?

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21Why is the material of the asteroid belt considered a leftover of planet formation?

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22How is Jupiter's gravity related to planet formation in the asteroid belt?

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23What is the best basis for distinguishing the Kuiper Belt from the asteroid belt?

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24The Oort Cloud hypothesis helps explain which type of comets?

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25Why does a comet's tail appear away from the Sun rather than toward it?

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