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Subjects

Geography

Mapping of the ocean floor

महासागर तल का मानचित्रण

In this Class 11 Geography topic from “Distribution of Oceans and Continents,” students learn how the ocean floor is mapped and interpreted. They explore major features such as continental shelves, slopes, deep-sea plains, mid-ocean ridges, trenches and seamounts, and understand how soundings, sonar and bathymetric maps reveal underwater relief. The topic also helps connect ocean-floor patterns with plate boundaries, seafloor spreading and the changing distribution of continents and oceans.

TOPIC PRACTICE

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

25 questions

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Medium · Level 1
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  1. Depth and ocean floor relief
  2. Only the colour of seawater
  3. Only coastal population
  4. Political division of oceans
Medium · Level 1
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  1. The sea is shallower
  2. The sea floor is deeper
  3. The sound wave has stopped
  4. The ship is near the coast
Medium · Level 1
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  1. The floor is completely flat
  2. There is no change in depth
  3. The slope is steep
  4. The sea floor is dry
Medium · Level 1
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  1. It makes seawater fresh
  2. It measures only one point
  3. It does not use sound
  4. It maps a wide strip of relief at once
Medium · Level 1
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  1. A shallow submerged continental part near the coast
  2. The deepest trench in the middle of ocean
  3. A high volcanic mountain on the sea floor
  4. A very flat plain of the deep ocean
Medium · Level 1
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  1. Because it only shows ocean colour
  2. Because it shows the change from shelf to deep ocean basin
  3. Because it closes all oceans
  4. Because it shows atmospheric layers
Medium · Level 1
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  1. Very shallow coastal water
  2. Steep mountain slope
  3. Broad flat area in deep ocean
  4. Floating ice on the surface
Medium · Level 1
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  1. Because they reduce seawater temperature
  2. Because they show coastal population
  3. Because they are only fishing areas
  4. Because they are linked with plate spreading zones
Medium · Level 1
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  1. Subduction
  2. Evaporation
  3. Glacial deposition
  4. Formation of sand dunes
Medium · Level 1
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  1. It directly enters the sea and cuts rocks
  2. It estimates floor relief from small sea-surface height variations
  3. It only counts ships
  4. It makes seawater solid
Medium · Level 1
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  1. A round mountain in deep sea
  2. A flat plain away from coast
  3. A deep cut valley on the sea floor
  4. An oil layer on sea surface
Medium · Level 1
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  1. A guyot has a flat top, whereas a seamount generally has a conical or irregular summit
  2. A guyot forms in an ocean trench, whereas a seamount occurs only near a continental coast
  3. A guyot is made of sedimentary rocks, whereas a seamount is made only of granite
  4. A guyot lies on the ocean floor, whereas a seamount always rises above sea level
Medium · Level 1
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  1. It helps understand relief in three-dimensional form
  2. Ocean salt disappears
  3. All ships start moving automatically
  4. Ocean boundaries disappear
Medium · Level 1
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  1. It made very fast and complete regional maps
  2. It gave only point depth and was slow
  3. It was operated by satellites
  4. It automatically gave sea-floor images
Medium · Level 1
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  1. To know cloud direction above the ocean
  2. To count coastal cities
  3. To show depth changes along a selected line
  4. To decide the colour of the ocean
Medium · Level 1
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  1. Language of fish in the sea
  2. Names of coastal cities
  3. Daily colour of the sea
  4. Geological history and nature of deposition
Medium · Level 1
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  1. To reduce errors and improve accuracy
  2. To heat the ocean more
  3. To change country borders on maps
  4. To stop sound waves
Medium · Level 1
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  1. Because it explains the meaning of colours and depth symbols
  2. Because the legend changes weather
  3. Because the legend dries the ocean
  4. Because the legend is only decoration
Medium · Level 1
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  1. Continental shelf
  2. Coastal lagoon
  3. Continental slope or trench
  4. Sea beach
Medium · Level 1
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  1. Both only count population
  2. Ship method directly measures depth while satellite gives indirect estimates
  3. Satellite drops a rope into the sea
  4. Ships never use sound
Medium · Level 1
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  1. Because safe routes can be selected
  2. Because fish colours change
  3. Because rainfall stops
  4. Because the ocean dries
Medium · Level 1
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  1. The same habitat occurs at every depth
  2. Depth affects light pressure and living conditions
  3. Depth has no relation with life
  4. Life exists only on coasts
Medium · Level 1
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  1. Taste of seawater
  2. Number of seabirds
  3. Coastal depth and sea-floor slope
  4. Colour of ships
Medium · Level 1
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  1. By dry land above the shelf
  2. By clouds on sea surface
  3. Only by fishing
  4. By a gentle sedimented zone below the continental slope
Medium · Level 1
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  1. Relief and geological structure
  2. Sea songs
  3. Age of sailors
  4. Coastal language

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