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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 5
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  1. For sea-surface temperature
  2. For imaging texture and objects on the floor
  3. For atmospheric pressure
  4. For coastal population
Hard · Level 5
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  1. It measures only water salinity
  2. It uses reflected waves from layers to reveal sediments and rock structure
  3. It records fish sounds
  4. It shows cloud height
Hard · Level 5
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  1. Because tides change sea-surface level
  2. Because tides always erase the sea floor
  3. Because tides stop sound
  4. Because tides occur only in the atmosphere
Hard · Level 5
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  1. As long linear troughs and ridges
  2. As circular farm fields
  3. As floating icebergs
  4. As coastal towns
Hard · Level 5
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  1. Because sound speed in water changes with temperature, salinity and pressure
  2. Because sound always travels in vacuum
  3. Because there is no light on the sea floor
  4. Because the ship does not remain stationary
Hard · Level 5
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  1. Where the shelf begins to change sharply into the continental slope
  2. Where sea water becomes fresh
  3. Where the mid-oceanic ridge ends
  4. Where only coral islands form
Hard · Level 5
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  1. Transport and deposition of sediments from the slope
  2. Effect of lunar eclipse
  3. Formation of atmospheric ozone
  4. Expansion of a land desert
Hard · Level 5
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  1. It is a broad elevated area, while the plain is relatively flat and deep
  2. It is always a sandy coastal part
  3. It is only a river delta
  4. It floats above sea level
Hard · Level 5
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  1. Ordered crust formation and spreading on the sea floor
  2. Rice farming on coasts
  3. Irregularity of air pressure
  4. Complete stability of the sea floor
Hard · Level 5
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  1. As small irregular rises on deep plains
  2. As sandy strips on continental coasts
  3. Only as waves on sea surface
  4. As river meanders
Hard · Level 5
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  1. Seamount or dense crustal rise
  2. Flight direction of seabirds
  3. Taste of sea water
  4. Coastal language zone
Hard · Level 5
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  1. To convert scattered measurements into a regular surface and map
  2. To make the ship invisible
  3. To change ocean colour
  4. To stop waves permanently
Hard · Level 5
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  1. Ship measures depth directly using sound, satellite estimates indirectly from sea surface and gravity
  2. Satellite lands on the sea floor and cuts rocks
  3. Ship measures only clouds
  4. Both count only coastal population
Hard · Level 5
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  1. Fracture zones
  2. Continental shelf
  3. Coral lagoon
  4. River delta
Hard · Level 5
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  1. New floor has had less time for sediment accumulation
  2. Young floor is always covered by fresh water
  3. Sediments form only in land deserts
  4. Old floor never has sediments
Hard · Level 5
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  1. To show different depths and elevations
  2. To show fish species
  3. To show taste of seawater
  4. To show coastal language
Hard · Level 5
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  1. Because fine particles can remain suspended in water for a long time
  2. Because they always burn in air
  3. Because they disappear as soon as they form on the sea floor
  4. Because they come only from the Himalayas
Hard · Level 5
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  1. Submarine rise or seamount
  2. Oceanic trench
  3. Perfectly flat floor
  4. River delta
Hard · Level 5
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  1. Deep depression or trench-like basin
  2. Summit of a seamount
  3. Continental coast
  4. Flat coral rock
Hard · Level 5
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  1. Wide shelf and greater sedimentation
  2. Very narrow shelf and many deep trenches
  3. Only mid-oceanic ridge
  4. Absence of sea floor
Hard · Level 5
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  1. Because slope may be steep and trenches may be near the plate boundary
  2. Because there is no sea water there
  3. Because there is only desert there
  4. Because all sediments immediately go into the sky
Hard · Level 5
View options
  1. Because a profile clearly shows slope and changes with distance
  2. Because a profile makes seawater fresh
  3. Because a profile makes a ship fly
  4. Because a profile shows only weather
Hard · Level 5
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  1. Movement of a plate over a fixed hotspot
  2. River flood
  3. Stopping of tides
  4. Change in coastal sand colour
Hard · Level 5
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  1. Its top may have been flattened by wave erosion and later submerged
  2. It always forms at a river mouth
  3. It is formed by falling from clouds
  4. It never has volcanic material
Hard · Level 5
View options
  1. Risk of damage to undersea cables and pipelines
  2. Pest attack in farms
  3. Urban traffic jam
  4. Desert sandstorm

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