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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.

Expert · Level 2 · 25 questions

TOPIC PRACTICE

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  1. Less solid mass was available in the inner region and light gases could not remain
  2. Inner planets formed in the coldest region
  3. Only hydrogen accumulated in inner planets
  4. Inner planets formed far beyond the Sun
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  1. They are counted among the oldest solids of the early solar system
  2. They are made from modern plants
  3. They form in Earth's present clouds
  4. They are found only on the Moon's surface
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  1. Photosynthetic life had not yet widely developed
  2. The Sun had no oxygen
  3. There was no gravity
  4. The Moon trapped the oxygen
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  1. It released internal gases and supplied early atmosphere and water vapor
  2. It changed Earth into the Sun
  3. It destroyed the Moon
  4. It changed all oceans into metal
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  1. They carry clues of leftover planet building material
  2. They are made from modern cities
  3. They block sunlight
  4. They create Earth's gravity
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  1. Gas giants have more hydrogen helium while ice giants have more important volatiles like water ammonia and methane
  2. Ice giants are inside the Sun
  3. Gas giants are small rocky planets
  4. There is no chemical difference between them
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  1. Internal motion of conducting fluid material
  2. Number of trees on the surface
  3. Only the color of sunset
  4. Orbit being a perfect square
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  1. Small mass and weak gravitational retention
  2. Farthest distance from the Sun and huge mass
  3. Being a complete gas giant
  4. Larger size than Earth and dense atmosphere
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  1. Distance and greenhouse processes caused different evolution
  2. Both have the same heat from the Sun
  3. Venus has no gas
  4. Earth is a gas giant
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  1. It shows its large mass and wide gravitational influence
  2. It shows Jupiter is a star
  3. It shows Jupiter has no core
  4. It shows the Sun is a small planet
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  1. Countless icy and dusty particles
  2. One giant rock
  3. Liquid ocean
  4. Wall of burning gas
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  1. How leftover material survived in the outer solar system
  2. How metal formed inside the Sun
  3. How agriculture began on Earth
  4. Why the galaxy is blue
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  1. Disturbance in small body orbits or formation of stable groups
  2. The Sun becoming zero in size
  3. Planets becoming light sources
  4. Atmosphere disappearing instantly
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  1. Outer planets have larger orbits and lower average orbital speed
  2. Outer planets have no mass
  3. The Sun does not attract outer planets
  4. Outer planets do not rotate
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  1. Protostar and accretion disk stage
  2. Dwarf planet classification
  3. Earth's crust formation stage
  4. Present state of the asteroid belt
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  1. The Sun's gravity controls planetary orbits
  2. Planets are heavier than the Sun
  3. The Sun is a dwarf planet
  4. Planets have no gravity
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  1. Intense impacts of leftover small bodies on established planets
  2. Empty space before star formation
  3. Beginning of the galaxy
  4. Modern human activity
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  1. Cooling of Earth and condensation of water vapor
  2. The Sun falling on Earth
  3. Complete melting of the Moon
  4. Jupiter becoming an ocean
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  1. Sufficient mass so self gravity balances the material
  2. Development of any organism
  3. Only ice on the surface
  4. A square shaped orbit
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  1. Orbital distance of planets may change after formation
  2. Planets never move
  3. The Sun revolves around Earth
  4. All planets formed and stayed at one place
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  1. Metals and heavy elements help form solid grains and rocky bodies
  2. Metallicity removes gravity
  3. Metallicity forms only water
  4. Metallicity makes planets invisible
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  1. Not all material fell into the center and remaining material stayed in a rotating disk
  2. The Sun destroyed all material
  3. The Moon stopped the material
  4. Earth was already ready
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  1. Their gas accumulation would have stopped when gas availability ended
  2. They would immediately become terrestrial planets
  3. The Sun would disappear
  4. Their gravity would become zero
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  1. Temperature changes with distance and changes the ability of materials to condense
  2. Gravity completely ends with distance
  3. All materials become gold with distance
  4. Planets become stars with distance
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  1. Molecular cloud contraction then protosun and disk then planetesimals then planets
  2. Planets then Sun then cloud
  3. Moon then galaxy then Sun
  4. Asteroids then oceans then stars

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