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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.

Hard · Level 6 · 20 questions

TOPIC PRACTICE

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20 questions

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  1. He considered interstellar gas and dust as source material
  2. He considered Earth flat
  3. He formed the Sun from oceans
  4. He placed life before planets
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  1. It explained river bends
  2. It tried to explain dynamic organization of matter in the solar nebula
  3. It explained present atmospheric oxygen
  4. It explained agriculture on Earth
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  1. A belt of fully developed stars
  2. A source of cosmic background radiation
  3. A region of leftover or incomplete planet-forming material
  4. Outer layer of present atmosphere
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  1. Water cycle model
  2. Tidal ocean model
  3. Steady state model
  4. Modern solar nebula model
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  1. Differentiation - expansion of universe
  2. Outgassing - galaxy formation
  3. Big Bang - present river system
  4. Solar nebula - origin of the solar system
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  1. Big Bang, galaxy formation, solar nebula, Earth accretion, differentiation
  2. Differentiation, Big Bang, solar nebula, galaxy
  3. Crust, universe, Sun, planetesimal
  4. Human, ocean, nebula, Big Bang
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  1. It explains only continental drift
  2. It explains only river erosion
  3. It explains orbital order, planetary composition, and remnant bodies together
  4. It explains only present monsoon
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  1. The question asks cosmic background radiation
  2. The question asks condensation of water vapour
  3. The question asks differentiation of Earth's crust
  4. The question mentions a passing star pulling matter from the Sun
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  1. The question mentions gas-dust cloud, gravitational collapse, and flat protoplanetary disk
  2. The question asks about river flood
  3. The question asks soil erosion
  4. The question asks new matter in steady state
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  1. Big Bang is not the direct cause of Earth's layers, layers formed by differentiation
  2. Big Bang happened after Earth
  3. Differentiation forms only rivers
  4. Crust formed from life
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  1. Present industries
  2. Gas release from Earth's interior and volcanic activity
  3. River deposition
  4. Cosmic red shift
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  1. Planet, protoplanet, planetesimal, dust particle
  2. Dust particle, planetesimal, protoplanet, planet
  3. River, planetesimal, planet, galaxy
  4. Human, dust particle, solar nebula, Earth
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  1. All old theories are always final
  2. New evidence can modify or replace old ideas
  3. Evidence has no role
  4. Modern models are only imagination
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  1. Accretion formed Earth's body and later outgassing developed the atmosphere
  2. Red shift formed atmosphere and river formed planet
  3. Steady state formed crust and monsoon formed core
  4. Life formed first and then planet formed
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  1. They always completely destroy all bodies
  2. They can help planet growth by joining small bodies
  3. They only create present earthquakes
  4. They stop cosmic expansion
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  1. Tidal theory, because a nearby star comes repeatedly
  2. Steady state theory, because it explains planetary composition
  3. Big Bang alone is enough, because it directly forms Earth's layers
  4. Modern solar nebula model, because it links gas-dust disk, accretion, orbits, and planetary composition
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  1. They helped push away remaining light gas and dust
  2. They formed Earth's rivers
  3. They started the Big Bang
  4. They changed the core into crust
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  1. They show that planet-forming disks can exist around stars
  2. They prove planets formed from rivers
  3. They finally prove the steady state theory
  4. They directly form Earth's crust
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  1. Outgassing
  2. Density-based differentiation
  3. Red shift
  4. Steady state
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  1. Light gases could not remain in the inner region and solid material was limited
  2. Inner planets captured galaxies
  3. Inner planets formed from oceans
  4. Inner planets had no gravity

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