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प्रश्न
Distinguish between the following.
Natural change and man-made change
उत्तर
| Natural changes | Man-made changes | |
| 1. | The changes that are brought about by nature itself and are not under the control of humans are called natural changes. | The changes that are brought about by humans are called man-made changes. |
| 2. | Examples: change of season, tides in the sea, aging of plants, etc. | Examples: burning of fuels, cutting hair, switching on lights, etc. |
संबंधित प्रश्न
What do you observe when :
solid ammonium chloride is heated
State whether the following is physical or chemical changes.
burning of wood -
State whether the following is physical or chemical changes.
passing electric current through a heater rod —
Tick (√) the correct alternative from the choice given for the following statement
Burning is a
What role does energy play in initiating a chemical change ?
Distinguish between the following.
Periodic change and non-periodic change
Give reason.
While purchasing canned food, its expiry date should be checked.
Give reason.
A dry handkerchief gets wet at once on dipping in water, but it takes longer for a wet handkerchief to dry.
Explain in brief the involvement of energy in physical and chemical changes.
______ is the process in which something becomes different from what it was earlier.
