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प्रश्न
What are man-made changes ?
उत्तर
Man-made changes are those that occur because of human activities e.g. changing the direction of flow of a river by building a dam.
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संबंधित प्रश्न
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Write short answer.
Give two examples of periodic changes
How do you say that the process of digestion is a chemical change ?
State three differences between evaporation and boiling
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
A physical change is temporary. Explain.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
