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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 4 · 25 questions

Practice questions

01What first caused the difference in composition between terrestrial and gaseous planets?

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02What is the main fuel of stars in nuclear fusion?

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03The sticking of dust particles in the early solar disk was the first step toward formation of what?

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04If a small body burns and glows in the atmosphere but does not reach the surface what is it called?

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05Which combination best explains Earth's suitability for life in the solar system?

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06Why are Venus and Earth very different in surface conditions despite similar size?

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07What relation of gravity and material made outer planets mostly giant?

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08What can result from fragmentation in a cloud of gas and dust?

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

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10What is the reason for iron and nickel being abundant in Earth's core?

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11What is considered one long term effect of the Moon on Earth after its formation?

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12Which statement correctly distinguishes terrestrial planets and ice giants?

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13The abundance of hydrogen and helium in Jupiter and Saturn is linked with which formation condition?

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14In solar system formation electrical and surface sticking of dust particles was more important in which stage?

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15Under which condition will a space body be called a meteorite?

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16If the Sun's gravity did not exist what would happen to planetary orbital arrangement?

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17Which feature of planets is important in supporting the nebular theory?

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18What does the position of the asteroid belt between inner and outer planets indicate?

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19Before oceans formed on early Earth what could have been a source of water vapour?

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20Why can a dwarf planet and a major planet both revolve around the Sun yet be in different categories?

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21Which statement explains a general difference between comet and planet orbits?

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22What is a good basis for distinguishing Uranus and Neptune from Jupiter and Saturn?

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23How did the effect of gravity increase with time during planetary accretion?

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24Why is the dense region of a nebula important in star formation?

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25The Sun's central role in the solar system is decided not only by position but also by what?

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