Chapter Exam

Chapter 6: Hydrosphere — Online MCQ Test

Q: What is the name of the shallow and gently sloping submerged edge of a continent?

Answer: A. Continental shelf — The continental shelf is the shallow submerged margin of a continent. It slopes gently from the coastline toward the deeper ocean floor.

Q: Which ocean feature is a broad, flat, deep-sea floor region?

Answer: B. Abyssal plain — An abyssal plain is a very flat and extensive part of the deep ocean floor. It lies beyond the continental rise at great depth.

GEOGRAPHY · CLASS 11 FIRST PUC · Karnataka State Board

Practice Chapter 6: Hydrosphere with a free chapter-wise online MCQ test for Karnataka State Board CLASS 11 FIRST PUC GEOGRAPHY. This chapter covers: Focusing on oceanography this chapter covers ocean floor topography continental shelf abyssal plain ocean temperature salinity dynamics ocean currents tidal mechanics and ocean con.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: Hydrosphere — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 11 FIRST PUC GEOGRAPHY — Chapter 6: Hydrosphere, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the name of the shallow and gently sloping submerged edge of a continent?

A. Continental shelf ✓
B. Abyssal plain
C. Ocean trench
D. Mid-ocean ridge

Answer: A. Continental shelf
The continental shelf is the shallow submerged margin of a continent. It slopes gently from the coastline toward the deeper ocean floor.

Which ocean feature is a broad, flat, deep-sea floor region?

A. Continental slope
B. Abyssal plain ✓
C. Continental rise
D. Sea mount

Answer: B. Abyssal plain
An abyssal plain is a very flat and extensive part of the deep ocean floor. It lies beyond the continental rise at great depth.

A place in the ocean where warm and cold currents meet is often rich in fish. Why?

A. Because the water becomes fresh and light
B. Because nutrients are brought to the surface and plankton grows ✓
C. Because tides stop completely there
D. Because salinity becomes zero

Answer: B. Because nutrients are brought to the surface and plankton grows
The meeting of warm and cold currents often creates nutrient-rich conditions. These support plankton growth, which attracts fish.

Which sequence correctly shows the major relief features of the ocean floor from the continent outward?

A. Abyssal plain → continental shelf → trench → slope
B. Continental shelf → continental slope → continental rise → abyssal plain ✓
C. Continental slope → shelf → abyssal plain → ridge
D. Trench → shelf → slope → abyssal plain

Answer: B. Continental shelf → continental slope → continental rise → abyssal plain
From the continent outward, the ocean floor commonly changes from the continental shelf to the continental slope, then continental rise, and finally the abyssal plain. This is the standard arrangement in ocean-floor topography.

Which of the following is the best reason why ocean conservation is important?

A. It helps increase desert rainfall directly
B. It protects marine biodiversity and maintains ecological balance ✓
C. It eliminates all tides and currents
D. It prevents the formation of all ocean basins

Answer: B. It protects marine biodiversity and maintains ecological balance
Ocean conservation is essential for protecting marine life, maintaining food chains, and preserving ecological balance. Healthy oceans also support climate regulation and livelihoods.