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प्रश्न
Distinguish between the following.
Periodic change and non-periodic change
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उत्तर
| Periodic change | Non-periodic change | |
| 1. | Events that repeat themselves after a fixed period of time and whose occurrence can be predicted are called periodic changes. | The events that do not repeat themselves after a regular interval of time are called non-periodic changes. |
| 2. | Example: rotation of earth, revolution of earth, day and night, seasons, etc. | Example: natural disasters like earthquake, cyclones, etc. |
संबंधित प्रश्न
What do you observe when :
solid ammonium chloride is heated
State whether the following is physical or chemical changes.
burning of wood -
State whether the following is physical or chemical changes.
Melting of wax —
State whether the following is physical or chemical changes.
Boiling of an egg —
Chemical changes are accompanied by changes in energy.
Under which different types can the following changes be classified?
Conversion of milk into yoghurt.
Under which different types can the following changes be classified?
Occurrence of an earthquake.
How can a change occur in a substance?
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?
______ is the process in which something becomes different from what it was earlier.
