Chapter Exam

Chapter-13 Hydrosphere — Online MCQ Test

Q: What percentage of the Earth's surface is covered by water?

Answer: C. About 71% — Nearly three-fourths of the Earth's surface is covered by water. This is why Earth is called the Blue Planet.

Q: Which is the largest ocean in the world?

Answer: D. Pacific Ocean — The Pacific Ocean is the largest and deepest ocean on Earth. It covers more area than all the other oceans.

Q: The shallow edge of the continent that is submerged under seawater is called the ______.

Answer: B. Continental shelf — The continental shelf is the gently sloping submerged part of the continent. It is an important zone for fishing and marine resources.

SOCIAL · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-13 Hydrosphere with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SOCIAL. This chapter covers: Description Describes oceans water distribution currents tides and marine resources Keywords Continental Shelf Tides Ocean Currents Gulf Stream Coral Reefs. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-13 Hydrosphere — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th SOCIAL — Chapter-13 Hydrosphere, with answers and explanations. These are sample questions; the exam has its own separate question set.

What percentage of the Earth's surface is covered by water?

A. About 29%
B. About 51%
C. About 71% ✓
D. About 90%

Answer: C. About 71%
Nearly three-fourths of the Earth's surface is covered by water. This is why Earth is called the Blue Planet.

Which is the largest ocean in the world?

A. Indian Ocean
B. Atlantic Ocean
C. Arctic Ocean
D. Pacific Ocean ✓

Answer: D. Pacific Ocean
The Pacific Ocean is the largest and deepest ocean on Earth. It covers more area than all the other oceans.

The shallow edge of the continent that is submerged under seawater is called the ______.

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

Answer: B. Continental shelf
The continental shelf is the gently sloping submerged part of the continent. It is an important zone for fishing and marine resources.

A fishing community notices that tides are especially high during new moon and full moon days. Which reason best explains this?

A. The Moon and Sun are in line, causing stronger tidal force ✓
B. The Earth stops rotating on those days
C. Ocean currents reverse direction completely
D. Rainfall increases only on those days

Answer: A. The Moon and Sun are in line, causing stronger tidal force
During new moon and full moon, the Sun, Moon, and Earth are nearly in a line. Their gravitational pulls combine to produce spring tides.

Which statement is the most accurate about the Gulf Stream?

A. It is a cold current that reduces rainfall in Europe
B. It is a warm current that moderates the climate of western Europe ✓
C. It is a tide that occurs only in the Atlantic Ocean
D. It is a coral reef region in the Pacific Ocean

Answer: B. It is a warm current that moderates the climate of western Europe
The Gulf Stream is a warm Atlantic Ocean current. It carries heat toward western Europe and helps keep its climate milder.

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