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प्रश्न
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Periodic and non-periodic change
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उत्तर
| Periodic change | Non-periodic change |
| (i) Changes which occur periodically (occur again and again) at regular intervals of time. | (i) Changes which do not occur periodically (do not repeat) at regular intervals of time. |
| (ii) Examples of a periodic change: Change of seasons, the occurrence of day and night, movement of a clock pendulum. |
(ii) Examples of a non-periodic change: Change of weather, growth of a plant, cyclones, earth-quakes, rusting of iron, thunder, and lightning. |
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Melting of solid (wax) is a physical change.
A physical change is temporary. Explain.
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
Sublimation is classified as a physical change. Why ?
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
Select the chemical changes from the following list of changes
Drying of a fruit
State whether the following statement is true or false:
Stretching of rubber bands is not a physical change.
Keeping a stone in sunlight for few hours is ______.
