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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

TOPIC PRACTICE

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25 questions

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  1. Origin from a common rotating nebula and further evolution by temperature gravity and impacts
  2. All planets broke from Earth in one day
  3. The Sun formed from the Moon and planets from oceans
  4. Comets are the original stars of all planets
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  1. Formation of gas giant planets
  2. Basic formation of rocky terrestrial planets
  3. Burning of meteorites in the atmosphere
  4. Formation of craters on the Moon
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  1. Gravitational instability
  2. Lunar tidal force
  3. Magnetic friction of planets
  4. Collision of asteroids
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  1. At the outer cold edge of the cloud
  2. In the central part of the contracting nebula
  3. In stable planetary orbits
  4. In comet tails
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  1. Immediate explosion of stars
  2. Direct breaking away of planets from the Sun
  3. Accretion of dust grains and formation of planetesimals
  4. Merger of outer galaxies
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  1. Greater distance from the Sun
  2. Greater freezing of light gases
  3. Low solar heat and more ice
  4. High temperature near the Sun and solar wind effect
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  1. Greater accumulation of gas and ice at lower temperatures far from the Sun
  2. Being very close to the Sun
  3. Having oceans like Earth
  4. Having only iron in the core
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  1. It is the actual edge of the Sun
  2. Beyond it volatile substances could condense as ice
  3. No solid matter formed inside it
  4. It ends the orbit of Earth
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  1. Stage of becoming a fully developed star
  2. Stage of galactic expansion
  3. Intermediate stage where planets form from small solid bodies
  4. Stage when solar wind ends
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  1. All materials become uniformly mixed
  2. The planet becomes completely gaseous
  3. All heavy elements come to the surface
  4. Heavy materials move to the centre and lighter materials move upward
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  1. Faster rotation of the contracting cloud and formation of a disk
  2. All planets remaining stationary
  3. The Sun cooling into a planet
  4. Planets leaving their orbits
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  1. It made the inner planets icy
  2. It removed light gases and left heavier materials dominant
  3. It made all planets equal in size
  4. It stopped planetary orbits
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  1. Completely empty space
  2. Region of only solid rocks
  3. A dense giant cloud of gas and dust
  4. Only asteroids around the Sun
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  1. Different galactic origin of planets
  2. Solid nature of the Sun
  3. Escape of comets
  4. Formation of planets from a rotating flattened disk
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  1. Mars and Jupiter
  2. Earth and Mars
  3. Venus and Earth
  4. Jupiter and Saturn
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  1. There was never any matter there
  2. Some matter could not assemble into a full planet
  3. All asteroids are stars made from the Sun
  4. Earth emerged from there
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  1. It immediately turns asteroids into stars
  2. It changes asteroids into water
  3. It can disturb the formation of a planet in that region
  4. It reduces the mass of the Sun
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  1. Interior of the Sun
  2. Between Mercury and Venus
  3. Between Earth and Moon
  4. Region of icy bodies beyond Neptune
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  1. Availability of icy and volatile materials in the outer solar system
  2. Formation of rocks inside the Sun
  3. Abundance of hydrogen in inner planets
  4. Destruction of planets after star death
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  1. They are made only of iron
  2. They contain more light gases and icy materials
  3. They have no gravity
  4. They formed inside the Sun
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  1. Collisions only destroy planets
  2. Collisions have no relation with planet formation
  3. Collisions occur only in the Sun
  4. Gentle collisions can combine small bodies into larger bodies
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  1. The Moon formed from debris after a large body struck early Earth
  2. The Moon came directly from the Sun
  3. The Moon is a broken part of Jupiter
  4. The Moon formed from a comet tail
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  1. Only moonlight
  2. Accretion impacts and radioactive decay
  3. Friction of sea waves
  4. Cooling by the modern atmosphere
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  1. A fully developed stable star
  2. A nebula made only of gas
  3. A large planetesimal body growing toward a planet
  4. A ray of the Sun
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  1. It is an outer planet
  2. It has water oceans
  3. It is very far from the Sun
  4. Its closeness to the Sun and weak gravity

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