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प्रश्न
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
विकल्प
periodic change
undesirable change
physical change
reversible change
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उत्तर
periodic change.
APPEARS IN
संबंधित प्रश्न
Explain the following giving an example.
Pure substance
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
What are reversible and irreversible changes ? Give one example for each.
State whether the following is physical or chemical changes.
shaping a piece of glass —
True or false
Change of seasons is a non-periodic change.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Give an example of a physical change in which the color of the substance changes.
