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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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Hard · Level 6
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  1. So depth points and survey lines remain correctly located
  2. So ocean colour changes
  3. So salinity becomes zero
  4. So rocks melt
Hard · Level 6
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  1. Ability to distinguish small landform features
  2. Remembering only names of large oceans
  3. Estimating depth without measurement
  4. Heating seawater
Hard · Level 6
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  1. Materials brought from land by rivers and coastal erosion
  2. Dust from Mars
  3. Direct sun rays from the sea floor
  4. Only sounds of deep-sea animals
Hard · Level 6
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  1. It can indicate biological sediment and depth-related conditions
  2. It shows only petrol pump locations
  3. It creates farmland on the sea floor
  4. It eliminates sound waves
Hard · Level 6
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  1. Because they may be narrow, deep and linked with active subduction zones
  2. Because there is no sea there
  3. Because they are always mountain summits
  4. Because there is only fresh water
Hard · Level 6
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  1. Axial part of a mid-oceanic ridge
  2. River flood plain
  3. Coastal sand dune
  4. Continental ice sheet
Hard · Level 6
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  1. Because crust spreads approximately symmetrically on both sides
  2. Because time stops in the ocean
  3. Because all rocks formed on one day
  4. Because only river deposits exist
Hard · Level 6
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  1. Oceanic crust is mainly basaltic in nature
  2. Oceanic crust is only granitic
  3. There are no rocks on the sea floor
  4. Basalt occurs only in river beds
Hard · Level 6
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  1. To collect rock and sediment samples from the sea floor
  2. To count clouds over sea surface
  3. To remove seawater permanently
  4. To stop the magnetic field
Hard · Level 6
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  1. They help obtain direct images and samples from deep floors
  2. They turn the sea into a desert
  3. They measure only atmospheric wind
  4. They always stop tides
Hard · Level 6
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  1. A gently sloping sedimentary belt at the foot of the slope
  2. Central rift in the mid-ocean
  3. Very narrow and deep trench
  4. Flat-topped volcanic mountain
Hard · Level 6
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  1. It helps identify potential mineral resource areas
  2. It ends coastal rainfall
  3. It makes seawater drinkable
  4. It shows only tourist routes
Hard · Level 6
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  1. They may be linked with active volcanic and mineral-forming processes
  2. They form only from glaciers
  3. They are river flood plains
  4. They make seawater zero depth
Hard · Level 6
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  1. Very close spacing of isobaths
  2. Complete absence of colours
  3. Length of the ocean name
  4. Change of language on the coast
Hard · Level 6
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  1. Transform faults and fracture zones
  2. River embankments
  3. Coral lagoons
  4. Rain shadow areas
Hard · Level 6
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  1. To confirm measurement reliability and changes
  2. To colour the sea twice
  3. To remove rocks
  4. To make waves permanent
Hard · Level 6
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  1. To show small slopes and depth changes clearly
  2. To make the sea floor disappear from reality
  3. To make water solid
  4. To increase fish number
Hard · Level 6
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  1. They can indicate tsunami and marine infrastructure hazards
  2. They show only farm fertility
  3. They end air pollution
  4. They make tides zero
Hard · Level 6
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  1. They provide physical evidence of oceanic crust formation and plate motion
  2. They show continents never move
  3. They only make coastal food lists
  4. They remove gravity
Hard · Level 6
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  1. Because of corrections for tide, sound speed, position and data processing
  2. Because the sea floor disappears every second
  3. Because maps have no scale
  4. Because all depths are equal
Hard · Level 6
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  1. Rapid cooling of basaltic lava under water
  2. Formation of sand dunes by wind
  3. Silt deposition in a river
  4. Valley cutting by glacier
Hard · Level 6
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  1. Location of plate boundaries and subduction zones
  2. Price of seafood
  3. Language of coastal cities
  4. Daily rainfall amount
Hard · Level 6
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  1. Submerged coastal valleys and old shorelines may be found
  2. Sea level never changes
  3. Only mountain glaciers are seen
  4. Every shelf is identical
Hard · Level 6
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  1. An oblique beam can cause errors in true position and depth
  2. Because a straight beam cannot enter water
  3. Because angle removes salinity
  4. Because the beam moves only in the sky
Hard · Level 6
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  1. It explains landforms and helps in mineral, cable and navigation planning
  2. It is useful only for writing poetry
  3. It turns oceans into land plains
  4. It has no use in geography

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