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प्रश्न
Give two examples for the following case:
Physical changes which are reversible
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उत्तर
- Folding of paper
- Melting of ice
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संबंधित प्रश्न
Classify the following changes as physical or chemical:-boiling
Write true or false
Cutting of paper into pieces is a chemical change.
Write true or false
Rusting of iron is a chemical change.
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
A physical change is temporary. Explain.
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Tearing of sheet of paper into pieces is ______ By the process of Heating of water, change.
A physical change is generally____________.
Mention a few physical properties of a substance.
