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प्रश्न
Tick the most appropriate answer.
Physical changes are
पर्याय
permanent
periodic
temporary
irreversible
उत्तर
temporary
APPEARS IN
संबंधित प्रश्न
Photosynthesis cannot take place at night.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Classify the following as a physical or a chemical change.
Boiling of water
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Filling up a balloon with hot air is a _______ change.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Cutting a log of wood into pieces is a chemical change.
