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प्रश्न
Select the chemical changes from the following list of changes
Glowing of an electric bulb.
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उत्तर
Glowing of an electric bulb is a PHYSICAL change as no change in the composition of filament takes place is reversible, the only filament glows when electricity is passed and returns to its original form on switching off the electric current.
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संबंधित प्रश्न
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
Photosynthesis cannot take place at night.
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Select the chemical changes from the following list of changes
Butter turning rancid
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
Natural changes which take place in nature on their own, are beyond the control of human being.
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
