1. What is the state of water in clouds?
2. What happens when rainwater flows into rivers?
3. Which one is hard to touch?
4. Which of the following is an example of evaporation?
5. Which will have highest rate of evaporation?
6. Which process represents condensation?
7. State whether true or false Oceans are major source of sweet water
8. We should take bath by as much water as we want
9. What is the main subject of Chapter 8?
10. According to the Thirukkural quote, what will happen if it does not rain well?