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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 5
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  1. Because the wave goes down and then returns
  2. Because the wave travels only in air
  3. Because the sea floor is not fixed
  4. Because the ship always remains still
Medium · Level 5
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  1. The floor has a gentle slope
  2. The floor has a steep slope or sharp drop
  3. The area is completely land
  4. Ocean depth is zero
Medium · Level 5
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  1. It marks the change from shelf to slope
  2. It stops surface waves
  3. It only shows seawater temperature
  4. It is the deepest part of a trench
Medium · Level 5
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  1. Because it sees only the sea surface
  2. Because it uses light instead of sound
  3. Because it sends sound beams in many directions and maps a wide area
  4. Because it maps only coastal cities
Medium · Level 5
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  1. It puts a rope into the sea
  2. It measures only fish movement
  3. It always measures depth manually
  4. It estimates relief from sea-surface height signals
Medium · Level 5
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  1. Convergent plate boundaries
  2. Transformed agricultural boundaries
  3. Stable climate boundaries
  4. River basin boundaries
Medium · Level 5
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  1. Evaporation of seawater
  2. Sea-floor spreading
  3. Desertification
  4. Glacial erosion
Medium · Level 5
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  1. Trench then shelf then coast
  2. Abyssal plain then coast then slope
  3. Continental shelf then slope then deep ocean plain
  4. Mountain then river then desert
Medium · Level 5
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  1. Because sediments indicate deposition and past environment
  2. Because sediments immediately dry the ocean
  3. Because sediments only show the number of ships
  4. Because sediments change wind direction
Medium · Level 5
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  1. Deep trench expedition
  2. Fisheries and offshore resource development
  3. Glacier formation
  4. Desert irrigation
Medium · Level 5
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  1. It is a submerged deep-cut feature on the sea floor
  2. It is a sand line formed in a desert
  3. It forms only in clouds
  4. It always floats on sea surface
Medium · Level 5
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  1. Colour of seabirds
  2. Change in depth with distance
  3. Type of coastal language
  4. Name of the ship
Medium · Level 5
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  1. A seamount may form an island if it rises above the surface
  2. A seamount is always a river delta
  3. A seamount is only a sandy coast
  4. A seamount is never volcanic
Medium · Level 5
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  1. An extremely deep, long ocean trench
  2. A flat-topped seamount
  3. A shallow lagoon near the coast
  4. A river-formed delta
Medium · Level 5
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  1. To make relief and depth differences visible
  2. To make seawater drinkable
  3. To make ships invisible
  4. To reduce the age of the ocean
Medium · Level 5
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  1. It makes all depths equal
  2. It reduces data gaps and measurement errors
  3. It converts sea surface into land
  4. It makes the map without scale
Medium · Level 5
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  1. Choosing a route with safe slope and fewer obstacles
  2. Changing the colour of the sea
  3. Changing fish species
  4. Stopping wind speed
Medium · Level 5
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  1. Wrong estimation of distance and slope
  2. Removal of salt from the sea
  3. Filling of all trenches
  4. Change of map topic
Medium · Level 5
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  1. They can affect the speed of sound
  2. They always make the sea floor flat
  3. They change the colour of the ship
  4. They close trenches
Medium · Level 5
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  1. Coastal depth slope and position of trenches
  2. List of sea songs
  3. Decoration of ships
  4. Names of coastal hotels
Medium · Level 5
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  1. It shows a gentle slope zone formed by sediments below the slope
  2. It always shows the deepest trench
  3. It shows foam on sea surface
  4. It shows only coastal cities
Medium · Level 5
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  1. Flat depositional areas of the deep ocean
  2. Road system of the coast
  3. Atmospheric pressure belts
  4. Source of desert sand
Medium · Level 5
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  1. Gentle slope area
  2. Steep vertical trench
  3. Cyclone on sea surface
  4. Dry desert
Medium · Level 5
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  1. A trench is a very deep narrow depression while a rift may be linked with spreading
  2. Both always form on the coast
  3. Both are formed only by rivers
  4. Neither is related to plate movement
Medium · Level 5
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  1. Because sudden depth and obstacle changes can increase risk
  2. Because there is no water there
  3. Because rainfall always stops there
  4. Because ships move only on land

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