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प्रश्न
Fill in the blank
Revolution of the earth around the sun is a ________ change.
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उत्तर
Revolution of the earth around the sun is a natural periodic change.
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संबंधित प्रश्न
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
Write true or false
A natural change can also be a desirable change.
Given reason:
Burning of paper is a chemical change.
What will you take into account while identifying the following?
A chemical change in a substance.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Periodic and non-periodic change
Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.
| Sr. No. | Physical changes | Chemical changes |
| 1. | ||
| 2. |
State whether the following statement is true or false:
Stretching of rubber bands is not a physical change.
Cutting a log of wood into pieces is a chemical change.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
