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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 6 · 25 questions

TOPIC PRACTICE

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25 questions

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  1. Greenhouse effect from a dense carbon dioxide atmosphere
  2. Being farthest from the Sun
  3. Icy surface and low temperature
  4. Complete absence of atmosphere
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  1. It is the smallest planet
  2. It is closest to the Sun
  3. Its very large mass influences the orbits of small bodies
  4. It has no moons
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  1. Living plants
  2. Solar flames
  3. Liquid iron
  4. Icy particles and rocky dust
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  1. They contain more icy volatiles such as water ammonia and methane
  2. They are smaller than Earth
  3. They are located inside the Sun
  4. They are made only of rock
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  1. Water came only from inside the Sun
  2. Some water may be linked with internal outgassing and external icy bodies
  3. Water came directly as rivers from Mars
  4. Water formed only from present human activity
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  1. Complete freezing of oceans
  2. Blocking of sunlight
  3. Release of gases from Earth's interior
  4. Planets changing their orbits
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  1. After continuous temperature rise
  2. After explosion of the Sun
  3. After moving near Jupiter
  4. After cooling of the outer part and differentiation of materials
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  1. When hydrogen fusion becomes stable in its core
  2. When it breaks into planets
  3. When all its gas becomes ice
  4. When it stops orbiting
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  1. Only in the core of the Sun
  2. Even in the hot region near the Sun
  3. Only outside the galaxy
  4. Never at any temperature
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  1. Planets were captured from different stars
  2. Planets have no common origin
  3. They formed from the same rotating solar disk
  4. The solar system is not stable
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  1. Inner planets are gaseous and outer planets are rocky
  2. Both groups are completely identical
  3. Outer planets have no gravity
  4. Inner planets are more rocky and outer planets are more gas and ice dominated
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  1. Accumulation of impact debris or captured bodies
  2. Only extinction of stars
  3. Evaporation of oceans
  4. Solidification of the Sun's surface
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  1. Lower temperature there allowed ice to remain stable
  2. Solar heat is highest there
  3. Only metal can form there
  4. There is no gravity there
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  1. It does not orbit the Sun
  2. It has not cleared the neighborhood around its orbit
  3. It is larger than Earth
  4. It is a gas giant
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  1. The Sun orbits the planets
  2. Planets have no definite orbits
  3. The Sun's gravity keeps planets bound in orbits
  4. The Sun has no gravity
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  1. Immediately destroying planets
  2. Making the Sun a solid rock
  3. Removing gas from all planets
  4. Triggering contraction of a nearby gas cloud
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  1. They were heavy metals and sank inward in the molten state
  2. They were the lightest gases
  3. They were light particles directly from the Sun
  4. They dissolved in water and formed clouds
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  1. Differentiation first then formation of small grains
  2. Accretion first grows the body then internal differentiation occurs
  3. Both have no relation
  4. Atmosphere first then Sun formation
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  1. Mars
  2. Venus
  3. Jupiter
  4. Earth
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  1. Venus Mercury Earth Mars
  2. Mercury Earth Venus Mars
  3. Mars Earth Venus Mercury
  4. Mercury Venus Earth Mars
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  1. The Sun
  2. Earth
  3. Moon
  4. Asteroid belt
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  1. It determined which materials could solidify at which locations
  2. It removed the Sun from orbit
  3. It made all planets identical
  4. It ended gravity
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  1. Because of their color
  2. Their own gravity arranges matter toward the centre
  3. Sunlight cuts them into shape
  4. Comets polish them
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  1. Pulling matter from the Sun by a passing star
  2. Separation of planets from Earth
  3. Common formation of Sun and planets from a rotating gas dust cloud
  4. Formation of the Sun from the Moon
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  1. Planets formed then nebula formed then Sun formed
  2. Moon formed then Sun formed then gas cloud formed
  3. Asteroids formed then galaxy formed then stars formed
  4. Nebular contraction then Sun and disk then planetesimals and planets

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