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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.

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Hard · Level 4
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  1. It helps ships avoid dangerous shallow zones and submerged obstacles
  2. It stops all storms
  3. It makes seawater fresh
  4. It removes latitudes
Hard · Level 4
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  1. Because active margins may have subduction and seismicity
  2. Because passive margins have no ocean
  3. Because active margins always lack shelves
  4. Because trenches form only in freshwater
Hard · Level 4
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  1. Very steep continental slope
  2. Passive continental margin and greater sediment deposition
  3. Direct proof of subduction zone
  4. Summit of mid oceanic ridge
Hard · Level 4
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  1. Oceanic depth is zero everywhere
  2. Age of seafloor increases progressively away from ridges
  3. There are no rocks on continents
  4. Only ice exists on sea surface
Hard · Level 4
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  1. Transport of marine sediments to deeper parts
  2. Blocking of solar heat
  3. Complete evaporation of the ocean
  4. Fixing of magnetic poles
Hard · Level 4
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  1. Because depth calculation depends on travel time and speed of sound
  2. Because sound changes ocean colour
  3. Because speed creates latitudes
  4. Because it gives distance to the Moon
Hard · Level 4
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  1. Quiet middle of abyssal plain
  2. Mid oceanic ridge
  3. Beach side of continental shelf
  4. Upper part of coral island
Hard · Level 4
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  1. Shelf then slope then rise then abyssal plain
  2. Trench then shelf then coast then slope
  3. Abyssal plain then coast then shelf then slope
  4. Ridge then coast then shelf then river
Hard · Level 4
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  1. The ocean floor is not completely smooth
  2. There are no landforms in oceans
  3. All mountains are only on continents
  4. Depth is formed only by tides
Hard · Level 4
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  1. It shows disrupted sediments and slump features on slopes
  2. It only shows movement of fish
  3. It makes seawater transparent
  4. It changes names of cyclones
Hard · Level 4
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  1. Stable passive margin
  2. Subduction zone
  3. Flat shelf region
  4. River delta region
Hard · Level 4
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  1. The ocean floor has varied relief features
  2. The ocean floor is almost flat and uniform
  3. Trenches can be very deep
  4. Ridges form long mountain chains
Hard · Level 4
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  1. Where sound speed changes with temperature salinity and pressure
  2. Where coastline is straight on a map
  3. Where boat colour is white
  4. Where sea names are short
Hard · Level 4
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  1. It shows direction of surface waves
  2. It gives evidence of symmetrical seafloor spreading
  3. It shows length of rivers
  4. It shows soil colour of shelf
Hard · Level 4
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  1. To get systematic and comparable coverage of an area
  2. To make all depths equal
  3. To make seawater solid
  4. To remove directions from the map
Hard · Level 4
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  1. Colour of sea flowers
  2. Direction of crustal movement and stress
  3. Amount of surface rainfall
  4. Age of fish
Hard · Level 4
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  1. Mid oceanic ridge
  2. Continental shelf
  3. Abyssal plain
  4. Coastal lagoon
Hard · Level 4
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  1. Relation between island arc and subduction
  2. Relation between island arc and desertification
  3. Relation between shelf and glacier
  4. Relation between abyssal plain and river meander
Hard · Level 4
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  1. Mapping provided evidence of the dynamic nature of the ocean floor
  2. Mapping made the existence of plates impossible
  3. Mapping is useful only for coastal tourism
  4. Mapping dried the oceans
Hard · Level 4
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  1. Seamount
  2. Continental shelf
  3. Isobath
  4. Ocean trench
Hard · Level 4
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  1. Small features may be missed and slopes may appear incorrectly
  2. Depths in unsurveyed areas become known with certainty without measurement
  3. The actual topography of the ocean floor changes
  4. All ocean regions become mapped at the same resolution
Hard · Level 4
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  1. Shelf is shallow continental margin while abyssal plain is deep oceanic flat area
  2. Both are always at the same depth
  3. Abyssal plain is above the coast
  4. Shelf occurs only inside trenches
Hard · Level 4
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  1. They show relief that influences ocean circulation pathways and deep water flow
  2. They sink the Sun into the ocean
  3. They make all clouds stationary
  4. They always make rainfall zero
Hard · Level 4
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  1. Abyssal plain with abyssal hills is present
  2. Continental shelf is above sea level
  3. All parts are river valleys
  4. It is only a coral reef
Hard · Level 4
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  1. Because depth patterns reveal ridges trenches crustal age and plate processes
  2. Because every depth gives the same meaning
  3. Because maps are separate from geology
  4. Because there are no rocks in oceans

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