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Question
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Solution
Revolution of the earth around the sun is a natural periodic change.
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RELATED QUESTIONS
Changes in which only ______ properties of a substance change are called physical changes.
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following as a physical or a chemical change.
Melting of wax
Fill in the blank.
The process of a liquid changing into a solid is called ________
Distinguish between the following.
Physical change and chemical change
Fill in the blank with the appropriate word of the statement given below:
Germination of seeds is considered a __________ change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Match the following
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ticking of clock |
| 2. | Condensation | Change of state from liquid to gas | Formation of ice cube |
| 3. | Evaporation | Change of state from solid to liquid | Collecting flowers |
| 4. | Freezing | Change of state from gas to liquid | Ice cube to water |
| 5. | Periodic change | Occurs at irregular time intervals | Water to steam |
| 6. | Non-periodic change | Occurs at regular time intervals | Steam to water drops |
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
