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प्रश्न
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
पर्याय
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true
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उत्तर
A is false but R is true
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संबंधित प्रश्न
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Write true or false for the statement
A natural change can also be a desirable change
Write true or false for the statement
Decomposition of leaves is a fast change.
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
State the differences between a physical change and a chemical change.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
Gas exists in three states as solid, liquid, and gas.
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
