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प्रश्न
Tick the most appropriate answer.
Physical changes are
विकल्प
permanent
periodic
temporary
irreversible
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उत्तर
temporary
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संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Fill in the blank.
Growing of a seedling into a plant is _______ change.
State whether the following is physical or chemical changes.
glowing of a bulb -
True or false
Dissolving of a solid in liquid is a physical change.
Which of the following are physical changes ?
- melting of iron metal
- rusting of iron metal
- bending of an iron rod
- drawing a wire of iron metal
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Wood to sawdust:______:: Wood to Ash: Chemical change
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:
Keeping a stone in sunlight for few hours is ______.
