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प्रश्न
Write true or false
Decomposition of leaves is a fast change.
विकल्प
True
False
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उत्तर
False.
Decomposition of leaves is a slow change.
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संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Write true or false for the statement
A natural change can also be a desirable change
Write true or false
Burning of sugar is a temporary change.
Tick the most appropriate answer.
Physical changes are
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 four difference between physical and chemical changes.
Compare the energy changes involved during a physical and a chemical change.
Physical Change: Boiling::Chemical Change: ______.
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
