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Class 7 Geography quiz explanations based on NCERT topics covering oceans, tides, tsunamis, freshwater resources, and Earth’s water distribution.
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Q1. What percentage of Earth’s surface is covered with water?
Correct Answer: 71%
Detailed Explanation
About 71% of the Earth’s surface is covered by water, while the remaining 29% is land. Most of this water is found in oceans and seas. Water plays a vital role in supporting life, regulating climate, and maintaining ecosystems. This is why Earth is often called the “Blue Planet.”
Important NCERT Points
Nearly three-fourths of the Earth’s surface is covered with water.
Exam-Oriented Fact
The Earth appears blue from space because of its vast water cover.
Quick Revision Line
About 71% of Earth’s surface is covered with water.
Q2. Which is the largest ocean in the world?
Correct Answer: Pacific Ocean
Detailed Explanation
The Pacific Ocean is the largest and deepest ocean on Earth. It covers more area than all the landmasses combined. The ocean stretches between Asia, Australia, North America, and South America. It contains thousands of islands and supports diverse marine life.
Important NCERT Points
The Pacific Ocean occupies about one-third of the Earth’s surface.
Exam-Oriented Fact
The Mariana Trench, the deepest known ocean trench, is located in the Pacific Ocean.
Quick Revision Line
The Pacific Ocean is the largest ocean in the world.
Q3. The rhythmic rise and fall of ocean water twice a day is called?
Correct Answer: Tide
Detailed Explanation
Tides are the regular rise and fall of ocean water that occur mainly due to the gravitational pull of the Moon and the Sun. Most coastal areas experience two high tides and two low tides each day. Tides are important for navigation, fishing, and coastal ecosystems.
Important NCERT Points
The Moon’s gravitational force is the major cause of tides.
Exam-Oriented Fact
High tide occurs when sea water rises above its normal level, while low tide occurs when it falls.
Quick Revision Line
Tides are the rhythmic rise and fall of ocean water.
Q4. What is the main cause of Tsunami?
Correct Answer: Undersea earthquakes
Detailed Explanation
A tsunami is usually caused by a strong earthquake beneath the ocean floor. The sudden movement of tectonic plates displaces a large volume of water, creating massive waves. As these waves reach coastal areas, they can cause severe destruction. Tsunamis are among the most powerful natural disasters.
Important NCERT Points
Most tsunamis originate from underwater earthquakes.
Exam-Oriented Fact
The Indian Ocean Tsunami of 2004 was triggered by a powerful undersea earthquake.
Quick Revision Line
Tsunamis are mainly caused by undersea earthquakes.
Q5. Where is most of the freshwater found on Earth?
Correct Answer: Ice caps and Glaciers
Detailed Explanation
Most of the Earth’s freshwater is stored in ice caps and glaciers located in polar regions and high mountains. Only a small portion of freshwater is available in rivers, lakes, and underground sources. Freshwater is essential for drinking, agriculture, and industry. Therefore, its conservation is very important.
Important NCERT Points
The majority of freshwater on Earth remains frozen in glaciers and ice caps.
Exam-Oriented Fact
Only a very small percentage of Earth’s total water is easily accessible freshwater.
Quick Revision Line
Most freshwater on Earth is found in ice caps and glaciers.
One-Line Revision Sheet
- About 71% of Earth’s surface is covered with water.
- The Pacific Ocean is the largest ocean in the world.
- Tides are the regular rise and fall of ocean water.
- Tsunamis are mainly caused by undersea earthquakes.
- Most freshwater is stored in ice caps and glaciers.
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