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प्रश्न
Make a list of different types of changes with example.
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उत्तर
Different types of changes are as under :
- Reversible Change e.g. Melting of ice.
- Irreversible Change e.g. Burning of paper.
- Periodic Change e.g. Swinging of pendulum.
- Non-Periodic Change e.g. Occurrence of floods.
- Desirable Change e.g. Ripening of fruits.
- Undesirable Change e.g. Rusting of Iron.
- Natural Change e.g. Changing of Seasons
- Man-Made Change e.g. Changing the direction of flow of a river by dams.
- Slow Change e.g. Growth of a plant
- Fast Change e.g. Occurrence of lightning during thunderstorm.
- Physical Change e.g. transformation of ice.
- Chemical Change e.g. curdling of milk.
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 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 formed | e. irreversible change |
| f . slow change |
Write true or false
Burning of paper and formation of curd are reversible changes.
Photosynthesis cannot take place at night.
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Give two examples for the following case:
Physical changes which are not reversible
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
