Hydrosphere Quiz - CBSE Class 6 Science

Free practice quiz: Hydrosphere (CBSE Class 6 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the largest source of water on Earth?

   1. Lakes
   2. Rivers
   3. Oceans
   4. Glaciers
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   Answer: C. Oceans

   Oceans cover about 71% of Earth's surface and contain 97% of the planet's water, making them the largest source.

2. Which of the following is not a type of freshwater source?

   1. Lakes
   2. Rivers
   3. Oceans
   4. Ponds
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   Answer: C. Oceans

   Oceans are saltwater bodies, while lakes, rivers, and ponds are sources of freshwater.

3. Which of these is essential for the process of photosynthesis in plants?

   1. Carbon Dioxide
   2. Water
   3. Sunlight
   4. All of the above
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   Answer: D. All of the above

   Photosynthesis requires carbon dioxide, water, and sunlight to produce glucose and oxygen.

4. Calculate the amount of water needed if a plant requires 250 mL per day and you have 10 plants.

   1. 500 mL
   2. 1500 mL
   3. 2500 mL
   4. 3000 mL
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   Answer: C. 2500 mL

   If each plant needs 250 mL of water, for 10 plants you multiply 250 mL by 10, resulting in 2500 mL.

5. What percentage of Earth’s water is freshwater?

   1. 1%
   2. 2.5%
   3. 10%
   4. 20%
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   Answer: B. 2.5%

   Only about 2.5% of Earth's water is freshwater, and the rest is saltwater found in oceans.

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