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Geography

Sources of information

In Class 11 Geography, this topic introduces how scientists investigate the Earth’s interior, which cannot be observed directly. Students distinguish direct evidence from mines, deep drilling and volcanic materials, and indirect evidence from seismic waves, meteorites, gravity, magnetic fields, and variations in temperature and pressure. The topic explains how these sources help infer the Earth’s internal structure and composition within the chapter Interior of the Earth.

Medium · Level 4 · 25 questions

TOPIC PRACTICE

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Up to 25 questions from this page. Select your focus, then start.

25 questions

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  1. High density metal is certain
  2. Low density underground material is possible
  3. Rainfall is definitely stopped
  4. Population is zero
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  1. Structure of oceanic crust
  2. Height of atmosphere
  3. Urban planning
  4. Crop rotation
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  1. Mineral and elemental composition
  2. Wind speed
  3. Population density
  4. Political boundary
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  1. Mines reach only limited depth
  2. No rocks are found in mines
  3. Mines exist only in atmosphere
  4. Mines are not related to Earth
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  1. Nature of magma and internal materials
  2. Only number of cities
  3. Only width of river
  4. Only school attendance
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  1. Because it gives internal clues but is not a sample up to the core
  2. Because it never comes from Earth
  3. Because it is only rainwater
  4. Because it gives no geological information
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  1. Direct mining method
  2. Controlled indirect geophysical method
  3. Agricultural production method
  4. Population counting method
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  1. Because magnetic study gives clues and needs comparison with other evidence
  2. Because magnetic values are always wrong
  3. Because magnetic field is unrelated to Earth
  4. Because magnetic study only tells rainfall
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  1. Waves show state and magnetism indicates metallic nature
  2. Both only show river depth
  3. Both show agricultural weather
  4. Both count population
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  1. Seismic waves gravity measurement magnetic study
  2. Mine rock drilling core lava
  3. Volcanic ash gas and bomb
  4. Ocean floor rock and mineral sample
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  1. Gravity measurement and magnetic study
  2. Seismic shadow zone and refraction
  3. Mine rock drilling core ocean floor rock
  4. Seismic travel time and velocity
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  1. Because they depend on weather
  2. Because they cannot give samples from great depth
  3. Because they are all wrong
  4. Because they give no real material
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  1. Medium may be less rigid or partly molten
  2. Area has more schools
  3. Rainfall always increases
  4. River taste changes
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  1. State of material can be understood from medium ability of both waves
  2. Both waves only tell weather
  3. Both waves remain only on surface
  4. Both waves give no information
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  1. Temperature increase with depth and geothermal gradient
  2. Population density and language
  3. Length and width of river
  4. Crop production and market value
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  1. Wave paths can be compared using records from many places
  2. It directly increases crops
  3. It stops rivers
  4. It shows colour of air
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  1. Comparing direct and indirect evidence
  2. Depending on only one source
  3. Reading only weather news
  4. Writing only guesses
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  1. Seismic waves and layer structure
  2. Gravity anomaly and density difference
  3. Rain gauge and liquid state of outer core
  4. Drilling core and rock sample
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  1. Analysis of rock and mineral samples
  2. Seismic shadow zone
  3. Magnetic anomaly
  4. Gravity anomaly
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  1. Direct and indirect sources
  2. Rural and urban sources
  3. Political and cultural sources
  4. Agricultural and trade sources
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  1. It is not direct but an indirect clue
  2. It is a sample from mine
  3. It is volcanic lava
  4. It is drilling core
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  1. Layer with liquid state
  2. Only gaseous atmosphere
  3. Completely empty layer
  4. Only biological layer
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  1. In comparing composition of early Earth like materials
  2. In measuring today's rainfall
  3. In stopping river flood
  4. In finding population density
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  1. Because each source has different information and limitation
  2. Because all sources only tell weather
  3. Because no source is useful
  4. Because Earth has no layer
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  1. Denser materials are present inside Earth
  2. No material is present inside Earth
  3. Surface rocks are the densest
  4. Density has no relation with internal structure

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