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Subjects

Geography

Early and modern theories

In Class 11 Geography, this topic explores how explanations for the origin and evolution of the Earth developed from early philosophical ideas to modern scientific theories. Students compare major hypotheses, including nebular explanations, and examine the astronomical, geological, and physical evidence used to understand the formation of the solar system and Earth. The topic also shows how observations, discoveries, and improved scientific models continually refine our understanding of the planet.

Expert · Level 6 · 21 questions

TOPIC PRACTICE

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21 questions

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  1. Completely calm and cold state
  2. Impact-rich and dynamic state
  3. Steady state universe
  4. River deposition state
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  1. It is based on known decay rates of radioactive isotopes
  2. It measures river-flow speed
  3. It tells soil moisture
  4. It tells monsoon direction
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  1. Old nebular and tidal ideas being revised into the modern solar nebula model through new evidence
  2. Treating all old theories as final
  3. Rejecting evidence
  4. Calling river erosion the Big Bang
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  1. Differentiation, Earth, galaxy, Big Bang
  2. Big Bang, early matter, galaxies, solar nebula, Earth accretion
  3. Solar nebula, Big Bang, river, Earth
  4. Crust, hydrosphere, Big Bang, star
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  1. Planet formation is physical accretion and origin of life is a later biochemical process
  2. Both happened at the same moment
  3. Life formed planets first
  4. Red shift formed life
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  1. Core by outgassing, atmosphere by red shift
  2. Internal layers by differentiation, atmosphere by outgassing, hydrosphere by condensation
  3. Hydrosphere by steady state, core by Big Bang
  4. Crust by life, atmosphere by river
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  1. Water vapour and rainfall
  2. Passing star and matter from the Sun
  3. Gas-dust cloud, gravitational collapse, and protoplanetary disk
  4. Soil and agriculture
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  1. It connects orbital order, planetary composition, and remnant bodies in one framework
  2. It explains only river erosion
  3. It explains only present weather
  4. It treats planets as living organisms
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  1. Old theories are final proofs
  2. Old theories relied more on limited observations and speculation, while modern models are better supported by evidence and physical processes
  3. Modern models are without evidence
  4. Both are only agricultural geography
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  1. The Sun formed at the center and planet-forming material remained in the disk
  2. An ocean formed at the center and rivers in the disk
  3. Earth formed at the center and the universe in the disk
  4. Life formed at the center and soil in the disk
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  1. Life formed first, then Earth formed
  2. Earth's body formed through physical processes and life developed later under suitable conditions
  3. Red shift first formed life
  4. Rivers formed the solar nebula
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  1. Layers by differentiation, atmosphere by outgassing, hydrosphere by cooling and condensation
  2. Layers by red shift, atmosphere by river, hydrosphere by monsoon
  3. All three formed by steady state
  4. All three formed directly by the Big Bang
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  1. Tidal theory because a passing star is a regular event
  2. Steady state theory because it explains planet composition
  3. Modern solar nebula model because it links gas-dust disk, accretion, orbital order, and planetary composition
  4. Only Big Bang because it directly forms Earth's layers
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  1. It provides the first stage for very small particles to become larger clumps
  2. It forms cosmic background radiation
  3. It gives direction to Earth's rivers
  4. It proves the steady state theory
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  1. Larger bodies attract smaller bodies faster due to stronger gravity and grow more rapidly
  2. Smaller bodies always push larger bodies away
  3. Planets suddenly form from river sediments
  4. Expansion of the universe stops
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  1. They could remain condensed even at high temperatures
  2. They are found only in oceans
  3. They are formed by red shift
  4. They are gases of the steady state theory
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  1. Lower temperature allowed ices and gases to remain
  2. Rivers were more common in outer regions
  3. Earth's crust existed in outer regions
  4. Red shift occurred only on outer planets
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  1. Molten state due to intense heat and later differentiation
  2. Present ocean waves
  3. Cosmic background radiation
  4. Matter creation in steady state
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  1. Volcanic outgassing and release of internal gases
  2. Hubble's red shift
  3. Matter pulled by a passing star
  4. River deposits and flood plains
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  1. The Moon is considered to have formed mainly from debris of Earth's outer silicate material
  2. The Moon formed directly from Earth's core
  3. The Moon formed from ocean water
  4. The Moon formed by red shift
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  1. Stars played a role in forming heavier elements and later planetary material
  2. Stars directly formed rivers
  3. Stars ended the steady state theory
  4. Stars immediately formed Earth's present crust

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