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SubjectsGeography
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.
Correct answer: C. Continental slope
Explanation: Continental rise forms below the slope due to sediment deposition. Exam tip: remember the order shelf, slope, rise.
Correct answer: D. They indicate floor structure and geological history
Explanation: Sediments give information about sea-floor formation and history. Exam tip: remember sediments as oceanic records.
Correct answer: A. Oceanic trenches
Explanation: Oceanic trenches are among the deepest sea-floor features. Exam tip: link trenches with maximum depth.
Correct answer: B. To make the map more accurate
Explanation: More measurements reduce errors in depth and shape. Exam tip: connect repeated data collection with accuracy.
Correct answer: C. It gives information about slopes, trenches and coastal depths
Explanation: Relief and coastal depth help assess wave impact. Exam tip: connect mapping with disaster studies.
Correct answer: D. Both have features like mountains, plains and valleys
Explanation: The sea floor also has varied relief like land. Exam tip: understand the ocean floor as a hidden landscape.
Correct answer: A. By darker colour or greater depth value
Explanation: Bathymetric maps use colours and depth values to show depth. Exam tip: always read the map legend.
Correct answer: B. Continental shelf
Explanation: The continental shelf is important for resources because it is shallow. Exam tip: link shelf with petroleum and fisheries.
Correct answer: C. Seamount
Explanation: If a seamount rises above the surface, it may form an island. Exam tip: remember the seamount-volcano relation.
Correct answer: D. Because pressure and distance are very high in the deep sea
Explanation: Human access is limited in the deep sea, so instruments are necessary. Exam tip: treat depth and pressure as major barriers.
Correct answer: A. To collect depth data using sonar instruments
Explanation: Survey ships collect data related to depth and floor relief. Exam tip: understand survey ships as measurement platforms.
Correct answer: A. It may show a spreading zone along the ridge
Explanation: A rift zone on a mid-oceanic ridge may be linked with sea-floor spreading. Exam tip: remember rift and spreading together.
Correct answer: C. Parliament House
Explanation: Parliament House is a human-made structure, not an ocean floor feature. Exam tip: distinguish natural features from human-made objects.
Correct answer: D. It helps identify sensitive marine habitats
Explanation: Relief information helps understand marine habitats and conservation areas. Exam tip: connect mapping with conservation.
Correct answer: A. Shape and slope of the floor
Explanation: Mapping shows not only depth but also shape and slope of the floor. Exam tip: look at relief, not just numbers.
Correct answer: A. It gives faster and more detailed measurements
Explanation: Sonar gives faster and more accurate information than older methods. Exam tip: remember sonar as an example of technological progress.
Correct answer: B. Sailors and ship navigators
Explanation: Sailors use marine maps to know safe routes and depths. Exam tip: connect marine charts with navigation.
Correct answer: C. Mid-oceanic ridge
Explanation: Mid-oceanic ridges are major raised features of the ocean floor. Exam tip: treat them as long submerged mountains.
Correct answer: D. It helps select safe and low-risk routes
Explanation: Cable routes are chosen by knowing slopes, trenches and obstacles. Exam tip: remember modern uses of mapping.
Correct answer: A. Movement of plates
Explanation: Trenches and ridges are related to plate movement and boundaries. Exam tip: study ocean features with plate tectonics.
Correct answer: B. Abyssal plain
Explanation: An abyssal plain is a broad flat part of the deep sea. Exam tip: see it as flatter and less steep than a trench.
Correct answer: C. As maps, profiles and digital models
Explanation: Depth data can be converted into maps, profiles and digital models. Exam tip: remember the process from data to map.
Correct answer: D. Because ridges, trenches and volcanoes show plate activity
Explanation: Large sea-floor features are linked with Earth's internal movements. Exam tip: treat the ocean floor as evidence of a dynamic Earth.
Correct answer: A. The sequence of depth and slope of the ocean floor
Explanation: A cross profile shows the order of shelf, slope and deeper parts. Exam tip: treat a profile as a cut view of the ocean floor.
Correct answer: B. The sea floor slope is steep
Explanation: Close isobaths mean depth changes quickly over a short distance. Exam tip: link close lines with steep slope.
