Advertisements
Advertisements
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 |
Advertisements
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 |
APPEARS IN
संबंधित प्रश्न
Explain the following giving an example.
Pure substance
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Dissolving salt in water is a reversible change.
Tick the most appropriate answer.
Photosynthesis requires
Write true or false
Deforestation is a man-made change.
Which of the following are physical changes and which are chemical changes ?
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
