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During water cycle in nature when seawater containing a lot of dissolved solid chemicals is converted into pure water, then water goes through
- Physical changes only
- Chemical changes only
- Both physical and chemical changes
- No changes at all
The correct answer is (a) - Physical changes only
Q2 When rain water is made to percolate into the ground more efficiently by constructing percolation pits, it is called
- Rainwater replenishing
- Groundwater replenishing
- Rainwater harvesting
- Rainwater collecting
The correct answer is (c) - Rainwater harvesting
Q3 Which of the following is the most impure form of water?
- Pond water
- Lake water
- Sea water
- Ground water
The correct answer is (c) - Sea water.