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प्रश्न
Write true or false
Earthquake is a desirable change.
पर्याय
True
False
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उत्तर
False
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संबंधित प्रश्न
Explain the following giving an example.
Pure substance
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Write short answer.
Give two examples of periodic changes
True or false
Change of seasons is a non-periodic change.
Name two reversible changes.
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Read the paragraph and note down the various types of changes it mentions.
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil, and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Filling up a balloon with hot air is a _______ change.
