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प्रश्न
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 |
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उत्तर
| Sr. No. | A | B | C |
| 1. | Melting | Change of state from liquid to solid | Ice cube to water |
| 2. | Condensation | Change of state from liquid to gas | Steam to water drops |
| 3. | Evaporation | Change of state from solid to liquid | Water to steam |
| 4. | Freezing | Change of state from gas to liquid | Formation of ice cube |
| 5. | Periodic change | Occurs at irregular time intervals | Ticking of clock |
| 6. | Non-periodic change | Occurs at regular time intervals | Collecting flowers |
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संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Write true or false for the statement
Decomposition of leaves is a fast change.
What are reversible and irreversible changes ? Give one example for each.
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
Classify the following as physical or chemical change :
Growth of a plant
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
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
Wood to sawdust:______:: Wood to Ash: Chemical change
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
