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Science Keywords Ch.6 Changes around us - Class 6 PDF Download

Keywords :-

1. Changes = Alternation from one form to another are called changes.

Example :- A baby Child to An adult 

Science Keywords Ch.6 Changes around us - Class 6


2. Contraction = Decrease in size of anything is called contraction.


3. Evaporation = Changing of water into vapour on heating is called evaporation.

Science Keywords Ch.6 Changes around us - Class 6


4. Expansion = Increase in size of anything is called Expansion.


5. Melting = Changing of a solid into liquid is called Melting.

Science Keywords Ch.6 Changes around us - Class 6

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FAQs on Science Keywords Ch.6 Changes around us - Class 6

1. How does temperature affect the changes around us?
Ans. Temperature is a key factor in causing changes around us. When the temperature increases, many substances, such as ice, melt and change from solid to liquid. Similarly, when the temperature decreases, some substances, like water, freeze and change from liquid to solid. Therefore, temperature plays a crucial role in determining the state of matter and its changes.
2. What are the different types of changes that occur around us?
Ans. There are three main types of changes that occur around us: physical changes, chemical changes, and biological changes. Physical changes alter the physical properties of a substance without changing its chemical composition, like melting ice or tearing paper. Chemical changes, on the other hand, result in the formation of new substances with different properties, like burning wood or rusting iron. Biological changes are related to living organisms and include growth, reproduction, and development.
3. How do changes around us affect the environment?
Ans. Changes around us can have both positive and negative impacts on the environment. For example, human activities like deforestation and pollution can lead to negative changes in the environment, such as habitat destruction and climate change. On the other hand, natural changes like rainfall and weather patterns are essential for maintaining the balance of ecosystems and supporting life. It is important to be aware of our actions and strive for sustainable changes to minimize negative impacts on the environment.
4. What are some examples of irreversible changes around us?
Ans. Irreversible changes are those that cannot be undone or reversed. Some examples of irreversible changes around us include burning a piece of paper, cooking food, or breaking a glass. Once these changes occur, it is not possible to revert back to the original state. Irreversible changes often involve chemical reactions that result in the formation of new substances.
5. How do changes around us affect our daily lives?
Ans. Changes around us have a significant impact on our daily lives. For instance, changes in weather and seasons influence our clothing choices and activities. Changes in technology and advancements affect the way we communicate, work, and even entertain ourselves. Changes in our surroundings, such as construction or development, can alter our daily routines and access to resources. Overall, changes are an integral part of our lives and shape our experiences.
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