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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 -
True or false?
In a chemical change, rearrangement of molecules and atoms involves some energy changes.
Fill in the blank
An earthquake is a _______ change.
Melting of solid (wax) is a physical change.
Under which different types can the following changes be classified?
Occurrence of an earthquake.
Under which different types can the following changes be classified?
Stretching of a spring.
Explain in brief the involvement of energy in physical and chemical changes.
Fill in the blank with the correct word of the statement given below:
Ammonium chloride, a sublimable solid undergoes _________ on heating.
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?
