Passage (English translation of the Hindi passage): "Water is life. Only about 3% of the total water on Earth is fresh, and most of that is also stored as ice. Therefore, it is our duty to use every drop of water wisely." According to the passage, why should we use water carefully?

Arrange the stages of coal formation in the order of increasing carbon content (lowest to highest).

Read the passage and answer. "Ravi woke up early every day to water the small garden behind his school. At first, many students laughed at him. But Ravi did not stop. After a few months, the garden was full of colourful flowers, and the same students came forward to help him." Which of the following can be inferred from the passage?

National Science Day is celebrated in India on 28 February to commemorate the discovery of which effect?

Find the missing number in the grid: Row 1: 2, 4, 8 Row 2: 3, 9, 27 Row 3: 5, ?, 125