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Long Answer Type Questions 25. When is a change said to have taken place in a material ? Explain with the help of an example. 26. What is meant by 'reversible changes' and 'irreversible changes' ? Explain with examples. 27. Explain how, a metal rim is fixed around the wooden wheel of a cart. What type of change/changes take place during this process ? 28. Explain why, the burning of paper is said to be an irreversible change whereas the boiling of water is known as a reversible change. 29. Is it possible that the same materials may undergo reversible and irreversible changes ? Give two examples in support of your answer. 30. Does the change in a material (or object) occur on its own ? Explain your answer with the help of an example
Explanation:
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