Advertisements
Advertisements
प्रश्न
Distinguish between the following.
Periodic change and non-periodic change
Advertisements
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
State whether the following is physical or chemical changes.
passing electric current through a heater rod —
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 —
Tick (√) the correct alternative from the choice given for the following statement
Burning is a
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.
Melting of solid (wax) is a physical change.
Fill in the blank with the correct word of the statement given below:
Ammonium chloride, a sublimable solid undergoes _________ on heating.
Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
| S. No. | Change | Can be reversed (Yes/No) |
| 1. | The sawing of a piece of wood | |
| 2. | The melting of ice candy | |
| 3. | Dissolving sugar in water | |
| 4. | The cooking of food | |
| 5. | The ripening of a mango | |
| 6. | Souring of milk |
Paper, LPG, CNG petrol, etc, are ______ substances.
