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प्रश्न
Distinguish between the following.
Natural change and man-made change
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उत्तर
| Natural changes | Man-made changes | |
| 1. | The changes that are brought about by nature itself and are not under the control of humans are called natural changes. | The changes that are brought about by humans are called man-made changes. |
| 2. | Examples: change of season, tides in the sea, aging of plants, etc. | Examples: burning of fuels, cutting hair, switching on lights, etc. |
संबंधित प्रश्न
What do you observe when :
solid ammonium chloride is heated
State whether the following is physical or chemical changes.
passing electric current through a heater rod —
True or false?
During a physical change energy is either given out or absorbed by the system.
True or false?
In a chemical change, rearrangement of molecules and atoms involves some energy changes.
Under which different types can the following changes be classified?
Bursting of a cracker.
Under which different types can the following changes be classified?
Stretching of a spring.
How can a change occur in a substance?
Picture based question
Observe the picture and list down the changes that are accompanied in the picture.
- ______.
- ______.
- ______.
Observe the picture containing a kettle and note that it has salt water in it and answer the following questions:
- What is name of the process that is done to the kettle?
- What will happen to the content of the kettle?
- What kind of change is occurring on the cold surface of the metal plate?
- What can you say about the quality of water that is obtained in the beaker?
Cut vegetables turn brown when exposed to air, this is due to ______.
