7th Class
Science
Winds, Storm and Cyclones
Question Bank
Natural Phenomena: Winds, Storm and Cyclones
question_answer
DIRECTIONS: Read the passage given below and answer the questions that follow. Passage ? 1 Take a boiling tube and stretch a balloon tightly over its neck. Insert the boiling tube in a beaker containing hot water. Wait for 2-3 minutes and observe the changes that take place in shape of the balloon. Now take out the boiling tube and allow it to cool to room temperature. When it has cooled down place it in a beaker containing ice-cold water for 2-3 minutes and observe the changes in shape of the balloon. What happens to the air when the tube with the stretched balloon is kept in hot water?