Water

Q1 · Water · EASY

A teacher wants to demonstrate the water cycle to Class 3 students. She heats water in a pan, and water vapour rises. She holds a cold plate above the vapour, and water droplets form on it. Which process does the formation of water droplets on the cold plate represent?

Q2 · Water · MEDIUM

In a village, people collect rainwater in tanks during the monsoon and use it throughout the year. They also dig ponds to allow rainwater to seep into the ground. What is the main purpose of letting rainwater seep into the ground?

Q3 · Water · MEDIUM

A family drinks water from a well. After heavy rains, some children in the family develop diarrhoea and stomach pain. The doctor says it is due to contaminated water. Which of the following is the most likely reason for water contamination in the well after rains?

Q4 · Water · MEDIUM

A science teacher asks students to purify muddy water collected from a pond. The students are given cotton cloth, sand, gravel, and charcoal. They set up layers of gravel, sand, and charcoal in a plastic bottle with a hole at the bottom and pour the muddy water through it. The water that comes out is clearer but may still contain germs. Which additional step should be taken to make the water safe for drinking?

Q5 · Water · HARD

A teacher explains that water in a lake decreases in summer even when there is no withdrawal of water by people. She draws a diagram showing the sun, the lake, and clouds. She wants students to understand that water is not lost but changes form and location. According to the water cycle, what happens to the water that disappears from the lake in summer?