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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 4 · 25 questions

TOPIC PRACTICE

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25 questions

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  1. Volatile materials could remain preserved in the cold region there
  2. Solar heat was highest there
  3. There was no solid material there
  4. Only molten metal was there
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  1. It is considered a possible source of distant comets
  2. It is the surface of Mercury
  3. It is Earth's ocean
  4. It is the solid core of the Sun
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  1. Pluto is linked with that outer region of icy bodies
  2. Pluto is inside the Sun
  3. Pluto is a gas giant larger than Earth
  4. Pluto has no orbit
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  1. It has not cleared the neighborhood around its orbit
  2. It does not orbit the Sun
  3. It is not nearly round
  4. It is not in the solar system
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  1. Dominance of hydrogen and helium in them
  2. They are made entirely of iron
  3. They are located inside the Sun
  4. They have no gravity
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  1. Volatiles such as water ammonia and methane have a larger role in them
  2. They are closest to the Sun
  3. They are terrestrial rocky planets
  4. They are comet tails
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  1. Terrestrial planets are rich in heavy rock and metal while Jovian planets are rich in light gases
  2. Jovian planets contain no matter
  3. Terrestrial planets are completely gaseous
  4. Both have the same composition
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  1. Internal motion of conducting fluid material
  2. Only sand on the surface
  3. Orbit being square
  4. Atmosphere being red
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  1. Low mass and weak gravitational retention
  2. Greatest mass
  3. Fusion like the Sun
  4. Huge hydrogen envelope
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  1. Closeness to the Sun and weak gravity
  2. Very large mass
  3. Dense icy cover
  4. Being an outer planet
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  1. Origin from a common rotating solar nebula
  2. Planets coming from different galaxies
  3. The Sun being smaller than planets
  4. Accidental formation of orbits
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  1. They indicate formation from a flattened protoplanetary disk
  2. They show planets emerged from Earth
  3. They show the Sun is solid
  4. They turn comets into stars
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  1. It explains common origin of Sun planets and orbital arrangement together
  2. It says Earth is the center of the solar system
  3. It says planets formed from modern dust
  4. It rejects gravity
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  1. It better explains coplanar orbits and common direction of planets
  2. It says all planets are gas pulled from the Sun
  3. It treats orbits as unstable
  4. It denies the existence of the Sun
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  1. Large craters on surfaces and changes in crust
  2. Birth of the Sun
  3. Disappearance of all planets
  4. Complete stopping of orbit
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  1. Icy small bodies could deliver some volatiles to planets
  2. They sent all water into the Sun
  3. They made planets fusion capable stars
  4. They can have no relation with water
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  1. Self gravity arranges matter into a balanced spherical form
  2. It turns a planet into a star
  3. It colors the atmosphere
  4. It cools the Sun
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  1. Gravitational control of the Sun over planetary orbits
  2. Planets being heavier than the Sun
  3. The Sun being a satellite
  4. Orbits forming without gravity
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  1. Due to larger orbit and lower average orbital speed
  2. Because planets have zero mass
  3. Because solar gravity disappears
  4. Because planets remain stationary
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  1. Formation from impact debris and gravitational capture
  2. Formation only from sun rays
  3. Formation only from oceans
  4. Planets becoming stars
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  1. Gravitational capture
  2. Division of the Sun
  3. Earth's rainfall
  4. Planets becoming light
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  1. Its large mass creates strong gravitational pull
  2. It has no gravity
  3. It is a tiny particle smaller than the Sun
  4. It is a terrestrial planet
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  1. Joining of dust and small particles in a protoplanetary disk
  2. Formation of fully developed Earth
  3. Formation of modern oceans
  4. Naming of dwarf planets
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  1. Rotation and angular momentum conservation during gravitational contraction
  2. Moon moving away from Earth
  3. Effect of modern weather
  4. Pressure of ocean waves
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  1. Molecular cloud contraction then protosun and disk then planetesimals then protoplanets and planets
  2. Planets then star then molecular cloud
  3. Ocean then Sun then planetesimals
  4. Asteroids then Earth then nebula

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