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प्रश्न
State whether the following is physical or chemical changes.
passing electric current through a heater rod —
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उत्तर
physical change.
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
Melting of wax —
What role does energy play in initiating a chemical change ?
Distinguish between the following.
Periodic change and non-periodic change
Under which different types can the following changes be classified?
Bursting of a cracker.
Under which different types can the following changes be classified?
Revolution of the earth around the sun.
Under which different types can the following changes be classified?
Stretching of a spring.
Give reason.
While purchasing canned food, its expiry date should be checked.
How can a change occur in a substance?
Paper, LPG, CNG petrol, etc, are ______ substances.
What is the change?
